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Study of $\barΛ$-$p$ Annihilation into Light Mesons
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
X. C. Ai,
C. S. Akondi,
R. Aliberti,
A. Amoroso,
Q. An,
Y. H. An,
Y. Bai,
O. Bakina,
H. -R. Bao,
X. L. Bao,
M. Barbagiovanni,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. B. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko
, et al. (736 additional authors not shown)
Abstract:
The annihilation of $\barΛ$-$p$ into light mesons is studied using $(10.087\pm0.044)\times10^{9}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring. The $\barΛ$ baryons are produced in the process $J/ψ\rightarrowΛ\barΛ$ and interact with the protons in the hydrogen nuclei in the cooling oil of the beam pipe. The reactions $\barΛp\rightarrow K^+π^+π^-$ and $K^+2π^+2π^-$ are…
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The annihilation of $\barΛ$-$p$ into light mesons is studied using $(10.087\pm0.044)\times10^{9}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring. The $\barΛ$ baryons are produced in the process $J/ψ\rightarrowΛ\barΛ$ and interact with the protons in the hydrogen nuclei in the cooling oil of the beam pipe. The reactions $\barΛp\rightarrow K^+π^+π^-$ and $K^+2π^+2π^-$ are observed for the first time, evidence for the reaction $\barΛp\rightarrow K^0_S2π^+π^-$ is found, and no significant signals are seen for the reactions $\barΛp\rightarrow K^0_Sπ^+$, $K^+3π^+3π^-$ and $2K^+K^-$. The cross sections of these reactions are also measured at $P_{\barΛ}\approx 1.074$ GeV/$c$. Furthermore, no significant structures are observed in the combinations of the final state particles for these reactions. The annihilation of $\barΛ$-$p$ into light mesons presents the similar behavior as $\bar{n}$-$p$ reactions in this energy region. These new measurements will serve as important inputs for the theoretical understanding of the antihyperon-nucleon interaction, and further contribute to understanding antibaryon-baryon interaction in a unified perspective.
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Submitted 4 February, 2026;
originally announced February 2026.
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Observation of $\barΛp\to K^{+}π^{+}π^{-}π^{0}$ and $\barΛp\to K^{+}π^{+}π^{-}2π^{0}$
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
X. C. Ai,
C. S. Akondi,
R. Aliberti,
A. Amoroso,
Q. An,
Y. H. An,
Y. Bai,
O. Bakina,
Y. Ban,
H. -R. Bao,
X. L. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. B. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko
, et al. (728 additional authors not shown)
Abstract:
Using $(10087 \pm 44) \times 10^6$ $J/ψ$ events collected with the BESIII detector at a center-of-mass energy of $\sqrt{s}=3.097$ GeV, the antihyperon-nucleon annihilation processes $\barΛ p \to K^+ π^+ π^- + kπ^0$ ($k=1,2,3$) are studied at an incident $\barΛ$ momentum of approximately 1.074 GeV/$c$. The reactions $\barΛ p \to K^+ π^+ π^- π^0$ and $\barΛ p \to K^+ π^+ π^- 2π^0$ are observed for t…
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Using $(10087 \pm 44) \times 10^6$ $J/ψ$ events collected with the BESIII detector at a center-of-mass energy of $\sqrt{s}=3.097$ GeV, the antihyperon-nucleon annihilation processes $\barΛ p \to K^+ π^+ π^- + kπ^0$ ($k=1,2,3$) are studied at an incident $\barΛ$ momentum of approximately 1.074 GeV/$c$. The reactions $\barΛ p \to K^+ π^+ π^- π^0$ and $\barΛ p \to K^+ π^+ π^- 2π^0$ are observed for the first time, with corresponding cross sections $σ_{\barΛ p \to K^+ π^+ π^- π^0} = 8.5^{+1.2}_{-1.1} (\rm{stat.}) \pm 0.4 (\rm {syst.})$ mb and $σ_{\barΛ p \to K^+ π^+ π^- 2π^0} = 7.9^{+1.9}_{-1.7} \pm 0.4$ mb. No significant signal is found for $\barΛ p \to K^+ π^+ π^- 3π^0$, and an upper limit of 7.2 mb is set at a 90\% confidence level. An evidence for the $K^{*}(892)^+$ resonance is seen in the $K^+π^0$ invariant mass spectrum $M_{K^+π^0}$ for $k=1$, and the corresponding cross section for $\barΛ p \to K^{*}(892)^+ π^+ π^-$ is measured to be $σ_{\barΛ p \to K^{*}(892)^+ π^+ π^-} = 12.5^{+3.8}_{-3.4} \pm 1.2$ mb. Owing to the limited statistics, possible interference effects are not considered. These findings offer crucial input to deepen our understanding of the antihyperon-nucleon interactions.
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Submitted 15 April, 2026; v1 submitted 1 February, 2026;
originally announced February 2026.
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Experimental study of the reaction $Ξ^{0}n\rightarrowΛΛX$ using $Ξ^{0}$-nucleus scattering
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Q. An,
Y. Bai,
O. Bakina,
Y. Ban,
H. -R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere,
A. Brueggemann,
H. Cai
, et al. (707 additional authors not shown)
Abstract:
Using $(10087\pm44)\times10^{6}$$J/ψ$ events collected with the BESIII detector operating at the BEPCII storage ring in $2009$, $2012$, $2018$, and $2019$, we perform a search for the reaction $Ξ^0n\rightarrowΛΛX$, where $X$ denotes any additional final particles. Given the highly suppressed phase space for producing extra pions, the $X$ consists of either nothing or a photon, corresponding to the…
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Using $(10087\pm44)\times10^{6}$$J/ψ$ events collected with the BESIII detector operating at the BEPCII storage ring in $2009$, $2012$, $2018$, and $2019$, we perform a search for the reaction $Ξ^0n\rightarrowΛΛX$, where $X$ denotes any additional final particles. Given the highly suppressed phase space for producing extra pions, the $X$ consists of either nothing or a photon, corresponding to the processes $Ξ^0 n \rightarrow ΛΛ$ and $Ξ^{0}n\rightarrowΛΣ^0\rightarrowΛΛγ$. The $Ξ^0$ comes from the decay of $J/ψ\rightarrowΞ^0\barΞ^0$, while the neutron originates from material of the beam pipe. A signal is observed for the first time with a statistical significance of 6.4$σ$. The cross section for the reaction $Ξ^0+{^9\rm{Be}}\rightarrowΛ+Λ+X$ is measured to be $(43.6\pm10.5_{\text{stat}}\pm11.1_{\text{syst}})$ mb at $P_{Ξ^0}\approx0.818$ GeV/$c$, where the first uncertainty is statistical and the second systematic. No significant $H$-dibaryon signal is observed in the $ΛΛ$ final state.
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Submitted 26 February, 2026; v1 submitted 4 December, 2025;
originally announced December 2025.
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First Evidence of Solar Neutrino Interactions on $^{13}$C
Authors:
SNO+ Collaboration,
:,
M. Abreu,
A. Allega,
M. R. Anderson,
S. Andringa,
D. M. Asner,
D. J. Auty,
A. Bacon,
T. Baltazar,
F. Barão,
N. Barros,
R. Bayes,
E. W. Beier,
A. Bialek,
S. D. Biller,
E. Caden,
M. Chen,
S. Cheng,
B. Cleveland,
D. Cookman,
J. Corning,
S. DeGraw,
R. Dehghani,
J. Deloye
, et al. (89 additional authors not shown)
Abstract:
The SNO+ Collaboration reports the first evidence of $^{8}\text{B}$ solar neutrinos interacting on $^{13}\text{C}$ nuclei. The charged current interaction proceeds through $^{13}\text{C} + ν_e \rightarrow {}^{13}\text{N} + e^-$ which is followed, with a 10 minute half-life, by ${}^{13}\text{N} \rightarrow {}^{13}\text{C} + e^+ +ν_e .$ The detection strategy is based on the delayed coincidence betw…
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The SNO+ Collaboration reports the first evidence of $^{8}\text{B}$ solar neutrinos interacting on $^{13}\text{C}$ nuclei. The charged current interaction proceeds through $^{13}\text{C} + ν_e \rightarrow {}^{13}\text{N} + e^-$ which is followed, with a 10 minute half-life, by ${}^{13}\text{N} \rightarrow {}^{13}\text{C} + e^+ +ν_e .$ The detection strategy is based on the delayed coincidence between the electron and the positron. Evidence for the charged current signal is presented with a significance of 4.2$σ$. Using the natural abundance of $^{13}\text{C}$ present in the scintillator, 5.7 tonnes of $^{13}\text{C}$ over 231 days of data were used in this analysis. The 5.6$^{+3.0}_{-2.3}$ observed events in the data set are consistent with the expectation of 4.7$^{+0.6}_{-1.3}$ events. This result is the second real-time measurement of CC interactions of $^{8}\text{B}$ neutrinos with nuclei and constitutes the lowest energy observation of neutrino interactions on $^{13}\text{C}$ generally. This enables the first direct measurement of the CC $ν_e$ reaction to the ground state of ${}^{13}\text{N}$, yielding an average cross section of $(16.1 ^{+8.5}_{-6.7} (\text{stat.}) ^{+1.6}_{-2.7} (\text{syst.}) )\times 10^{-43}$ cm$^{2}$ over the relevant $^{8}\text{B}$ solar neutrino energies.
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Submitted 29 October, 2025; v1 submitted 28 August, 2025;
originally announced August 2025.
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Constraining neutron-proton effective mass splitting through nuclear giant dipole resonance within transport approach
Authors:
Yi-Dan Song,
Min-Si Luo,
Rui Wang,
Zhen Zhang,
Yu-Gang Ma
Abstract:
Based on the Boltzmann-Uehling-Uhlenbeck equation, we investigate the effects of the isovector nucleon effective mass $m^*_{v,0}$ and the in-medium nucleon-nucleon cross section $σ^*$ on the isovector giant dipole resonance~(IVGDR) in $^{208}{\rm Pb}$, employing a set of representative Skyrme energy density functionals. We find that the energy-weighted sum rule $m_1$ of the IVGDR is highly sensiti…
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Based on the Boltzmann-Uehling-Uhlenbeck equation, we investigate the effects of the isovector nucleon effective mass $m^*_{v,0}$ and the in-medium nucleon-nucleon cross section $σ^*$ on the isovector giant dipole resonance~(IVGDR) in $^{208}{\rm Pb}$, employing a set of representative Skyrme energy density functionals. We find that the energy-weighted sum rule $m_1$ of the IVGDR is highly sensitive to $m^{*}_{v,0}$ and only mildly dependent on $σ^*$, while the width $Γ$ of the IVGDR is primarily governed by $σ^*$ with a moderate sensitivity to $m^*_{v,0}$. From a Bayesian analysis of both $m_1$ and $Γ$, we infer the isovector effective mass $m^{*}_{v,0}/m$ = $0.731^{+0.027}_{-0.023}$, where $m$ is the bare nucleon mass. Furthermore, by incorporating the isoscalar effective mass $m^*_{s,0}/m = 0.820 \pm 0.030$, extracted from the isoscalar giant quadrupole resonance in $^{208}{\rm Pb}$, the linear neutron-proton effective mass splitting coefficient at saturation density $ρ_0$ is determined to be $Δm^*_1 (ρ_0)/m = 0.200 ^{+0.101}_{-0.094}$.
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Submitted 29 July, 2025;
originally announced July 2025.
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First measurement of $Σ^{+}n\rightarrowΛp$ and $Σ^{+}n\rightarrowΣ^{0}p$ cross sections via $Σ^+$-nucleus scattering at an electron-positron collider
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Q. An,
Y. Bai,
O. Bakina,
Y. Ban,
H. -R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere,
A. Brueggemann,
H. Cai
, et al. (680 additional authors not shown)
Abstract:
Using $(1.0087\pm0.0044)\times10^{10}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the reactions $Σ^{+}n\rightarrowΛp$ and $Σ^{+}n\rightarrowΣ^{0}p$ are studied, where the $Σ^{+}$ baryon is produced in the process $J/ψ\rightarrowΣ^{+}\barΣ^-$ and the neutron is a component of the $^9\rm{Be}$, $^{12}\rm{C}$ and $^{197}\rm{Au}$ nuclei in the beam pipe. Clear signals o…
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Using $(1.0087\pm0.0044)\times10^{10}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the reactions $Σ^{+}n\rightarrowΛp$ and $Σ^{+}n\rightarrowΣ^{0}p$ are studied, where the $Σ^{+}$ baryon is produced in the process $J/ψ\rightarrowΣ^{+}\barΣ^-$ and the neutron is a component of the $^9\rm{Be}$, $^{12}\rm{C}$ and $^{197}\rm{Au}$ nuclei in the beam pipe. Clear signals of these two reactions are observed for the first time. Their cross sections are measured to be $σ(Σ^{+}+{^9\rm{Be}}\rightarrowΛ+p+X)=(45.2\pm12.1_{\rm{stat}}\pm7.2_{\rm{sys}})$ mb and $σ(Σ^{+}+{^9\rm{Be}}\rightarrowΣ^{0}+p+X)=(29.8\pm9.7_{\rm{stat}}\pm6.9_{\rm{sys}})$ mb for a $Σ^{+}$ average momentum of $0.992$ GeV/$c$, within a range of $\pm0.015$ GeV/$c$, where $X$ represents the residual nucleus. This is the first study of $Σ^{+}$-nucleon scattering at an electron-positron collider.
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Submitted 24 March, 2026; v1 submitted 26 May, 2025;
originally announced May 2025.
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Observation of a rare beta decay of the charmed baryon with a Graph Neural Network
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
O. Afedulidis,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Q. An,
Y. Bai,
O. Bakina,
I. Balossino,
Y. Ban,
H. -R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere
, et al. (637 additional authors not shown)
Abstract:
The beta decay of the lightest charmed baryon $Λ_c^+$ provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters. This article presents the first observation of the Cabibbo-suppressed decay…
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The beta decay of the lightest charmed baryon $Λ_c^+$ provides unique insights into the fundamental mechanism of strong and electro-weak interactions, serving as a testbed for investigating non-perturbative quantum chromodynamics and constraining the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters. This article presents the first observation of the Cabibbo-suppressed decay $Λ_c^+ \rightarrow n e^+ ν_{e}$, utilizing $4.5~\mathrm{fb}^{-1}$ of electron-positron annihilation data collected with the BESIII detector. A novel Graph Neural Network based technique effectively separates signals from dominant backgrounds, notably $Λ_c^+ \rightarrow Λe^+ ν_{e}$, achieving a statistical significance exceeding $10σ$. The absolute branching fraction is measured to be $(3.57\pm0.34_{\mathrm{stat.}}\pm0.14_{\mathrm{syst.}})\times 10^{-3}$. For the first time, the CKM matrix element $\left|V_{cd}\right|$ is extracted via a charmed baryon decay as $0.208\pm0.011_{\rm exp.}\pm0.007_{\rm LQCD}\pm0.001_{τ_{Λ_c^+}}$. This work highlights a new approach to further understand fundamental interactions in the charmed baryon sector, and showcases the power of modern machine learning techniques in experimental high-energy physics.
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Submitted 15 January, 2025; v1 submitted 17 October, 2024;
originally announced October 2024.
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Initial measurement of reactor antineutrino oscillation at SNO+
Authors:
SNO+ Collaboration,
:,
A. Allega,
M. R. Anderson,
S. Andringa,
M. Askins,
D. M. Asner,
D. J. Auty,
A. Bacon,
J. Baker,
F. Barão,
N. Barros,
R. Bayes,
E. W. Beier,
T. S. Bezerra,
A. Bialek,
S. D. Biller,
E. Blucher,
E. Caden,
E. J. Callaghan,
M. Chen,
S. Cheng,
B. Cleveland,
D. Cookman,
J. Corning
, et al. (97 additional authors not shown)
Abstract:
The SNO+ collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years of data. Fitting the neutrino oscillation probability to the observed energy spectrum yields constraints on the neutrino mass-squared difference $Δm^2_{21}$. In the ranges allowed by previous measurements, the best-fit $Δm^2_{21}$ is (8.85$^{+1.10}_{-1.33}$) $\times$ 1…
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The SNO+ collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years of data. Fitting the neutrino oscillation probability to the observed energy spectrum yields constraints on the neutrino mass-squared difference $Δm^2_{21}$. In the ranges allowed by previous measurements, the best-fit $Δm^2_{21}$ is (8.85$^{+1.10}_{-1.33}$) $\times$ 10$^{-5}$ eV$^2$. This measurement is continuing in the next phases of SNO+ and is expected to surpass the present global precision on $Δm^2_{21}$ with about three years of data.
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Submitted 10 January, 2025; v1 submitted 30 May, 2024;
originally announced May 2024.
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First study of antihyperon-nucleon scattering $\barΛp\rightarrow\barΛp$ and measurement of $Λp\rightarrowΛp$ cross section
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
O. Afedulidis,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Q. An,
Y. Bai,
O. Bakina,
I. Balossino,
Y. Ban,
H. -R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere
, et al. (634 additional authors not shown)
Abstract:
Using $(10.087\pm0.044)\times10^{9}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the processes $Λp\rightarrowΛp$ and $\barΛp\rightarrow\barΛp$ are studied, where the $Λ/\barΛ$ baryons are produced in the process $J/ψ\rightarrowΛ\barΛ$ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cr…
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Using $(10.087\pm0.044)\times10^{9}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the processes $Λp\rightarrowΛp$ and $\barΛp\rightarrow\barΛp$ are studied, where the $Λ/\barΛ$ baryons are produced in the process $J/ψ\rightarrowΛ\barΛ$ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cross sections in $-0.9\leq\rm{cos}θ_{Λ/\barΛ}\leq0.9$ are measured to be $σ(Λp\rightarrowΛp)=(12.2\pm1.6_{\rm{stat}}\pm1.1_{\rm{sys}})$ mb and $σ(\barΛ p\rightarrow\barΛ p)=(17.5\pm2.1_{\rm{stat}}\pm1.6_{\rm{sys}})$ mb at the $Λ/\barΛ$ momentum of $1.074$ GeV/$c$ within a range of $\pm0.017$ GeV/$c$, where the $θ_{Λ/\barΛ}$ are the scattering angles of the $Λ/\barΛ$ in the $Λp/\barΛp$ rest frames. Furthermore, the differential cross sections of the two reactions are also measured, where there is a slight tendency of forward scattering for $Λp\rightarrowΛp$, and a strong forward peak for $\barΛp\rightarrow\barΛp$. We present an approach to extract the total elastic cross sections by extrapolation. The study of $\barΛp\rightarrow\barΛp$ represents the first study of antihyperon-nucleon scattering, and these new measurements will serve as important inputs for the theoretical understanding of the (anti)hyperon-nucleon interaction.
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Submitted 18 May, 2024; v1 submitted 17 January, 2024;
originally announced January 2024.
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First measurement of $ΛN$ inelastic scattering with $Λ$ from $e^{+} e^{-} \rightarrow J/ψ\to Λ\barΛ$
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
O. Afedulidis,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Q. An,
Y. Bai,
O. Bakina,
I. Balossino,
Y. Ban,
H. -R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere
, et al. (626 additional authors not shown)
Abstract:
Using an $e^+ e^-$ collision data sample of $(10087 \pm 44)\times10^6 ~J/ψ$ events taken at the center-of-mass energy of $3.097~\rm{GeV}$ by the BESIII detector at the BEPCII collider, the process $Λ+N \rightarrow Σ^+ + X$ is studied for the first time employing a novel method. The $Σ^{+}$ hyperons are produced by the collisions of $Λ$ hyperons from $J/ψ$ decays with nuclei in the material of the…
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Using an $e^+ e^-$ collision data sample of $(10087 \pm 44)\times10^6 ~J/ψ$ events taken at the center-of-mass energy of $3.097~\rm{GeV}$ by the BESIII detector at the BEPCII collider, the process $Λ+N \rightarrow Σ^+ + X$ is studied for the first time employing a novel method. The $Σ^{+}$ hyperons are produced by the collisions of $Λ$ hyperons from $J/ψ$ decays with nuclei in the material of the BESIII detector. The total cross section of $Λ+ ^{9}{\rm Be} \rightarrow Σ^+ + X$ is measured to be $σ= (37.3 \pm 4.7 \pm 3.5)~{\rm mb}$ at $Λ$ beam momenta within $[1.057, 1.091]~{\rm GeV}/c$, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of $Λ$-nucleon interactions at an $e^+ e^-$ collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars.
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Submitted 1 October, 2023;
originally announced October 2023.
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First study of reaction $Ξ^{0}n\rightarrowΞ^{-}p$ using $Ξ^0$-nucleus scattering at an electron-positron collider
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
R. Aliberti,
A. Amoroso,
M. R. An,
Q. An,
Y. Bai,
O. Bakina,
I. Balossino,
Y. Ban,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
J. Bloms,
A. Bortone,
I. Boyko,
R. A. Briere,
A. Brueggemann
, et al. (593 additional authors not shown)
Abstract:
Using $(1.0087\pm0.0044)\times10^{10}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the process $Ξ^{0}n\rightarrowΞ^{-}p$ is studied, where the $Ξ^0$ baryon is produced in the process $J/ψ\rightarrowΞ^0\barΞ^0$ and the neutron is a component of the $^9\rm{Be}$, $^{12}\rm{C}$ and $^{197}\rm{Au}$ nuclei in the beam pipe. A clear signal is observed with a statistical si…
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Using $(1.0087\pm0.0044)\times10^{10}$ $J/ψ$ events collected with the BESIII detector at the BEPCII storage ring, the process $Ξ^{0}n\rightarrowΞ^{-}p$ is studied, where the $Ξ^0$ baryon is produced in the process $J/ψ\rightarrowΞ^0\barΞ^0$ and the neutron is a component of the $^9\rm{Be}$, $^{12}\rm{C}$ and $^{197}\rm{Au}$ nuclei in the beam pipe. A clear signal is observed with a statistical significance of $7.1σ$. The cross section of the reaction $Ξ^0+{^9\rm{Be}}\rightarrowΞ^-+p+{^8\rm{Be}}$ is determined to be $σ(Ξ^0+{^9\rm{Be}}\rightarrowΞ^-+p+{^8\rm{Be}})=(22.1\pm5.3_{\rm{stat}}\pm4.5_{\rm{sys}})$ mb at the $Ξ^0$ momentum of $0.818$ GeV/$c$, where the first uncertainty is statistical and the second is systematic. No significant $H$-dibaryon signal is observed in the $Ξ^-p$ final state. This is the first study of hyperon-nucleon interactions in electron-positron collisions and opens up a new direction for such research.
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Submitted 28 May, 2023; v1 submitted 26 April, 2023;
originally announced April 2023.
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Evidence of Antineutrinos from Distant Reactors using Pure Water at SNO+
Authors:
SNO+ Collaboration,
:,
A. Allega,
M. R. Anderson,
S. Andringa,
J. Antunes,
M. Askins,
D. J. Auty,
A. Bacon,
N. Barros,
F. Barao,
R. Bayes,
E. W. Beier,
T. S. Bezerra,
A. Bialek,
S. D. Biller,
E. Blucher,
E. Caden,
E. J. Callaghan,
S. Cheng,
M. Chen,
B. Cleveland,
D. Cookman,
J. Corning,
M. A. Cox
, et al. (92 additional authors not shown)
Abstract:
The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. The nearest nuclear reactors are located 240~km away in Ontario, Canada. This analysis uses events with energies lower than in any previous analysis with a large water Cherenkov detector. Two analytical methods are used to distinguish reactor antineutrinos from background events in 190 days of data…
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The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. The nearest nuclear reactors are located 240~km away in Ontario, Canada. This analysis uses events with energies lower than in any previous analysis with a large water Cherenkov detector. Two analytical methods are used to distinguish reactor antineutrinos from background events in 190 days of data and yield consistent evidence for antineutrinos with a combined significance of 3.5$σ$.
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Submitted 28 March, 2023; v1 submitted 25 October, 2022;
originally announced October 2022.
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First inverse kinematics measurement of resonances in $^7$Be($α,γ$)$^{11}$C relevant to neutrino-driven wind nucleosynthesis using DRAGON
Authors:
A. Psaltis,
A. A. Chen,
R. Longland,
D. S. Connolly,
C. R. Brune,
B. Davids,
J. Fallis,
R. Giri,
U Greife,
D. A. Hutcheon,
L. Kroll,
A. Lennarz,
J. Liang,
M. Lovely,
M. Luo,
C. Marshall,
S. N. Paneru,
A. Parikh,
C. Ruiz,
A. C. Shotter,
M. Williams
Abstract:
A possible mechanism to explain the origin of the light $p$-nuclei in the Galaxy is the nucleosynthesis in the proton-rich neutrino-driven wind ejecta of core-collapse supernovae via the $νp$-process. However this production scenario is very sensitive to the underlying supernova dynamics and the nuclear physics input. As far as the nuclear uncertainties are concerned, the breakout from the $pp$-ch…
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A possible mechanism to explain the origin of the light $p$-nuclei in the Galaxy is the nucleosynthesis in the proton-rich neutrino-driven wind ejecta of core-collapse supernovae via the $νp$-process. However this production scenario is very sensitive to the underlying supernova dynamics and the nuclear physics input. As far as the nuclear uncertainties are concerned, the breakout from the $pp$-chains via the $^7$Be($α,γ$)$^{11}$C reaction has been identified as an important link which can influence the nuclear flow and therefore the efficiency of the $νp$-process. However its reaction rate is poorly known over the relevant temperature range, T = 1.5-3 GK. We report on the first direct measurement of two resonances of the $^7$Be($α,γ$)$^{11}$C reaction with previously unknown strengths using an intense radioactive $^7$Be beam from the ISAC facility and the DRAGON recoil separator in inverse kinematics. We have decreased the $^7$Be($α,γ$)$^{11}$C reaction rate uncertainty to $\sim$ 9.4-10.7% over the relevant temperature region.
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Submitted 14 September, 2022;
originally announced September 2022.
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Direct measurement of resonances in $^7$Be($α,γ$)$^{11}$C relevant to $νp$-process nucleosynthesis
Authors:
A. Psaltis,
A. A. Chen,
R. Longland,
D. S. Connolly,
C. R. Brune,
B. Davids,
J. Fallis,
R. Giri,
U Greife,
D. A. Hutcheon,
L. Kroll,
A. Lennarz,
J. Liang,
M. Lovely,
M. Luo,
C. Marshall,
S. N. Paneru,
A. Parikh,
C. Ruiz,
A. C. Shotter,
M. Williams
Abstract:
We have performed the first direct measurement of two resonances of the $^7$Be($α,γ$)$^{11}$C reaction with unknown strengths using an intense radioactive $^7$Be beam and the DRAGON recoil separator. We report on the first measurement of the 1155 and 1110 keV resonance strengths of $1.73 \pm 0.25(stat.) \pm 0.40(syst.)$ eV and $125 ^{+27}_{-25}(stat.) \pm 15(syst.)$ meV, respectively. The present…
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We have performed the first direct measurement of two resonances of the $^7$Be($α,γ$)$^{11}$C reaction with unknown strengths using an intense radioactive $^7$Be beam and the DRAGON recoil separator. We report on the first measurement of the 1155 and 1110 keV resonance strengths of $1.73 \pm 0.25(stat.) \pm 0.40(syst.)$ eV and $125 ^{+27}_{-25}(stat.) \pm 15(syst.)$ meV, respectively. The present results have reduced the uncertainty in the $^7$Be($α,γ$)$^{11}$C reaction rate to $\sim$ 9.4-10.7% over T = 1.5-3 GK, which is relevant for nucleosynthesis in the neutrino-driven outflows of core-collapse supernovae ($νp$-process). We find no effect of the new, constrained reaction rate on $νp$-process nucleosynthesis.
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Submitted 14 September, 2022;
originally announced September 2022.
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Optical calibration of the SNO+ detector in the water phase with deployed sources
Authors:
SNO+ Collaboration,
:,
M. R. Anderson,
S. Andringa,
M. Askins,
D. J. Auty,
F. Barão,
N. Barros,
R. Bayes,
E. W. Beier,
A. Bialek,
S. D. Biller,
E. Blucher,
M. Boulay,
E. Caden,
E. J. Callaghan,
J. Caravaca,
M. Chen,
O. Chkvorets,
B. Cleveland,
D. Cookman,
J. Corning,
M. A. Cox,
C. Deluce,
M. M. Depatie
, et al. (98 additional authors not shown)
Abstract:
SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and is located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data for two years as a pure water Cherenkov detector, starting in May 2017. During this period, the optical properties of the detector were measured in situ using a deployed light…
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SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and is located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data for two years as a pure water Cherenkov detector, starting in May 2017. During this period, the optical properties of the detector were measured in situ using a deployed light diffusing sphere, with the goal of improving the detector model and the energy response systematic uncertainties. The measured parameters included the water attenuation coefficients, effective attenuation coefficients for the acrylic vessel, and the angular response of the photomultiplier tubes and their surrounding light concentrators, all across different wavelengths. The calibrated detector model was validated using a deployed tagged gamma source, which showed a 0.6% variation in energy scale across the primary target volume.
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Submitted 4 October, 2021; v1 submitted 7 June, 2021;
originally announced June 2021.
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The SNO+ Experiment
Authors:
SNO+ Collaboration,
:,
V. Albanese,
R. Alves,
M. R. Anderson,
S. Andringa,
L. Anselmo,
E. Arushanova,
S. Asahi,
M. Askins,
D. J. Auty,
A. R. Back,
S. Back,
F. Barão,
Z. Barnard,
A. Barr,
N. Barros,
D. Bartlett,
R. Bayes,
C. Beaudoin,
E. W. Beier,
G. Berardi,
A. Bialek,
S. D. Biller,
E. Blucher
, et al. (229 additional authors not shown)
Abstract:
The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta ($0νββ$) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 tonnes of natural tellurium, corresponding to 1.3 tonnes of $^{130}$Te. This paper provides a general overview of the SNO+ experiment, including detector design, construction of pr…
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The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta ($0νββ$) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 tonnes of natural tellurium, corresponding to 1.3 tonnes of $^{130}$Te. This paper provides a general overview of the SNO+ experiment, including detector design, construction of process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. The SNO+ collaboration is reusing the acrylic vessel, PMT array, and electronics of the SNO detector, having made a number of experimental upgrades and essential adaptations for use with the liquid scintillator. With low backgrounds and a low energy threshold, the SNO+ collaboration will also pursue a rich physics program beyond the search for $0νββ$ decay, including studies of geo- and reactor antineutrinos, supernova and solar neutrinos, and exotic physics such as the search for invisible nucleon decay. The SNO+ approach to the search for $0νββ$ decay is scalable: a future phase with high $^{130}$Te-loading is envisioned to probe an effective Majorana mass in the inverted mass ordering region.
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Submitted 25 August, 2021; v1 submitted 23 April, 2021;
originally announced April 2021.
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Observation of a near-threshold structure in the $K^+$ recoil-mass spectra in $e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
P. Adlarson,
S. Ahmed,
M. Albrecht,
R. Aliberti,
A. Amoroso,
Q. An,
Anita,
X. H. Bai,
Y. Bai,
O. Bakina,
R. Baldini Ferroli,
I. Balossino,
Y. Ban,
K. Begzsuren,
N. Berger,
M. Bertani,
D. Bettoni,
F. Bianchi,
J Biernat,
J. Bloms,
A. Bortone,
I. Boyko
, et al. (481 additional authors not shown)
Abstract:
We report a study of the processes of $e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$ based on $e^+e^-$ annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb$^{-1}$. An excess over the known contributions of the conventional charmed mesons is observed near the…
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We report a study of the processes of $e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$ based on $e^+e^-$ annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb$^{-1}$. An excess over the known contributions of the conventional charmed mesons is observed near the $D_s^- D^{*0}$ and $D^{*-}_s D^0$ mass thresholds in the $K^{+}$ recoil-mass spectrum for events collected at $\sqrt{s}=4.681$ GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as $(3982.5^{+1.8}_{-2.6}\pm2.1)$ MeV/$c^2$ and $(12.8^{+5.3}_{-4.4}\pm3.0)$ MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 $σ$ over the contributions only from the conventional charmed mesons. This is the first candidate of the charged hidden-charm tetraquark with strangeness, decaying into $D_s^- D^{*0}$ and $D^{*-}_s D^0$. However, the properties of the excess need further exploration with more statistics.
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Submitted 12 March, 2021; v1 submitted 16 November, 2020;
originally announced November 2020.
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Measurement of neutron-proton capture in the SNO+ water phase
Authors:
The SNO+ Collaboration,
:,
M. R. Anderson,
S. Andringa,
M. Askins,
D. J. Auty,
N. Barros,
F. Barão,
R. Bayes,
E. W. Beier,
A. Bialek,
S. D. Biller,
E. Blucher,
R. Bonventre,
M. Boulay,
E. Caden,
E. J. Callaghan,
J. Caravaca,
D. Chauhan,
M. Chen,
O. Chkvorets,
B. Cleveland,
M. A. Cox,
M. M. Depatie,
J. Dittmer
, et al. (108 additional authors not shown)
Abstract:
The SNO+ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $γ$ produced by neutron capture on hydrogen have been made using an Am-Be calibration source, for which a large fraction of emitted neutrons are produced simultaneously with a 4.4-MeV $γ$. Analysis of the delayed coincidence between the 4.4-MeV $γ$ and the 2.…
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The SNO+ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $γ$ produced by neutron capture on hydrogen have been made using an Am-Be calibration source, for which a large fraction of emitted neutrons are produced simultaneously with a 4.4-MeV $γ$. Analysis of the delayed coincidence between the 4.4-MeV $γ$ and the 2.2-MeV capture $γ$ revealed a neutron detection efficiency that is centered around 50% and varies at the level of 1% across the inner region of the detector, which to our knowledge is the highest efficiency achieved among pure water Cherenkov detectors. In addition, the neutron capture time constant was measured and converted to a thermal neutron-proton capture cross section of $336.3^{+1.2}_{-1.5}$ mb.
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Submitted 13 July, 2020; v1 submitted 24 February, 2020;
originally announced February 2020.
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Polarization and Entanglement in Baryon-Antibaryon Pair Production in Electron-Positron Annihilation
Authors:
BESIII Collaboration,
M. Ablikim,
M. N. Achasov,
S. Ahmed,
M. Albrecht,
M. Alekseev,
A. Amoroso,
F. F. An,
Q. An,
Y. Bai,
O. Bakina,
R. Baldini Ferroli,
Y. Ban,
K. Begzsuren,
D. W. Bennett,
J. V. Bennett,
N. Berger,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Boger,
I. Boyko,
R. A. Briere,
H. Cai,
X. Cai
, et al. (444 additional authors not shown)
Abstract:
Using a sample of $1.31\times 10^9$ $J/ψ$ events collected with the BESIII detector, we report the first observation of spin polarization of $Λ$ and $\barΛ$ hyperons from the coherent production in the $J/ψ\toΛ\barΛ$ decay. We measure the phase between the hadronic form factors to be $ΔΦ=(42.4\pm0.6\pm0.5)^\circ$. The decay parameters for $Λ\to pπ^-$ ($α_-$), $\barΛ\to\bar pπ^+$ ($α_+$) and…
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Using a sample of $1.31\times 10^9$ $J/ψ$ events collected with the BESIII detector, we report the first observation of spin polarization of $Λ$ and $\barΛ$ hyperons from the coherent production in the $J/ψ\toΛ\barΛ$ decay. We measure the phase between the hadronic form factors to be $ΔΦ=(42.4\pm0.6\pm0.5)^\circ$. The decay parameters for $Λ\to pπ^-$ ($α_-$), $\barΛ\to\bar pπ^+$ ($α_+$) and $\barΛ\to\bar nπ^0$ ($\barα_0$) are measured to be $α_-=0.750\pm0.009\pm0.004$, $α_+=-0.758\pm0.010\pm0.007$ and $\barα_0=-0.692\pm0.016\pm0.006$, respectively. The obtained value of $α_-$ is higher by $(17\pm 3)\%$ than the current world average. In addition, the $CP$ asymmetry of $-0.006\pm0.012\pm0.007$ is extracted with substantially improved precision. The ratio $\barα_0/α_{+} = 0.913\pm 0.028 \pm 0.012$ is also measured.
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Submitted 27 August, 2018;
originally announced August 2018.