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Search for Boosted Dark Matter Interacting With Electrons in Super-Kamiokande
Authors:
Super-Kamiokande Collaboration,
:,
C. Kachulis,
K. Abe,
C. Bronner,
Y. Hayato,
M. Ikeda,
K. Iyogi,
J. Kameda,
Y. Kato,
Y. Kishimoto,
Ll. Marti,
M. Miura,
S. Moriyama,
M. Nakahata,
Y. Nakano,
S. Nakayama,
Y. Okajima,
A. Orii,
G. Pronost,
H. Sekiya,
M. Shiozawa,
Y. Sonoda,
A. Takeda,
A. Takenaka
, et al. (135 additional authors not shown)
Abstract:
A search for boosted dark matter using 161.9 kiloton-years of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic Center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones aro…
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A search for boosted dark matter using 161.9 kiloton-years of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic Center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic Center and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced from cold dark matter annihilation or decay.
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Submitted 31 May, 2018; v1 submitted 14 November, 2017;
originally announced November 2017.
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First results from the DEAP-3600 dark matter search with argon at SNOLAB
Authors:
DEAP-3600 Collaboration,
:,
P. -A. Amaudruz,
M. Baldwin,
M. Batygov,
B. Beltran,
C. E. Bina,
D. Bishop,
J. Bonatt,
G. Boorman,
M. G. Boulay,
B. Broerman,
T. Bromwich,
J. F. Bueno,
P. M. Burghardt,
A. Butcher,
B. Cai,
S. Chan,
M. Chen,
R. Chouinard,
B. T. Cleveland,
D. Cranshaw,
K. Dering,
J. DiGioseffo,
S. Dittmeier
, et al. (81 additional authors not shown)
Abstract:
This paper reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produ…
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This paper reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produced by rare nuclear recoil signals induced by dark matter particle scattering. An analysis of 4.44 live days (fiducial exposure of 9.87 tonne-days) of data taken with the nearly full detector during the initial filling phase demonstrates the detector performance and the best electronic recoil rejection using pulse-shape discrimination in argon, with leakage $<1.2\times 10^{-7}$ (90% C.L.) between 16 and 33 keV$_{ee}$. No candidate signal events are observed, which results in the leading limit on WIMP-nucleon spin-independent cross section on argon, $<1.2\times 10^{-44}$ cm$^2$ for a 100 GeV/c$^2$ WIMP mass (90% C.L.).
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Submitted 13 August, 2018; v1 submitted 25 July, 2017;
originally announced July 2017.
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Physics Potentials with the Second Hyper-Kamiokande Detector in Korea
Authors:
Hyper-Kamiokande proto-collaboration,
:,
K. Abe,
Ke. Abe,
S. H. Ahn,
H. Aihara,
A. Aimi,
R. Akutsu,
C. Andreopoulos,
I. Anghel,
L. H. V. Anthony,
M. Antonova,
Y. Ashida,
V. Aushev,
M. Barbi,
G. J. Barker,
G. Barr,
P. Beltrame,
V. Berardi,
M. Bergevin,
S. Berkman,
L. Berns,
T. Berry,
S. Bhadra,
D. Bravo-Bergu no
, et al. (331 additional authors not shown)
Abstract:
Hyper-Kamiokande consists of two identical water-Cherenkov detectors of total 520~kt with the first one in Japan at 295~km from the J-PARC neutrino beam with 2.5$^{\textrm{o}}$ Off-Axis Angles (OAAs), and the second one possibly in Korea in a later stage. Having the second detector in Korea would benefit almost all areas of neutrino oscillation physics mainly due to longer baselines. There are sev…
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Hyper-Kamiokande consists of two identical water-Cherenkov detectors of total 520~kt with the first one in Japan at 295~km from the J-PARC neutrino beam with 2.5$^{\textrm{o}}$ Off-Axis Angles (OAAs), and the second one possibly in Korea in a later stage. Having the second detector in Korea would benefit almost all areas of neutrino oscillation physics mainly due to longer baselines. There are several candidate sites in Korea with baselines of 1,000$\sim$1,300~km and OAAs of 1$^{\textrm{o}}$$\sim$3$^{\textrm{o}}$. We conducted sensitivity studies on neutrino oscillation physics for a second detector, either in Japan (JD $\times$ 2) or Korea (JD + KD) and compared the results with a single detector in Japan. Leptonic CP violation sensitivity is improved especially when the CP is non-maximally violated. The larger matter effect at Korean candidate sites significantly enhances sensitivities to non-standard interactions of neutrinos and mass ordering determination. Current studies indicate the best sensitivity is obtained at Mt. Bisul (1,088~km baseline, $1.3^\circ$ OAA). Thanks to a larger (1,000~m) overburden than the first detector site, clear improvements to sensitivities for solar and supernova relic neutrino searches are expected.
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Submitted 26 March, 2018; v1 submitted 18 November, 2016;
originally announced November 2016.
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Dark Sectors 2016 Workshop: Community Report
Authors:
Jim Alexander,
Marco Battaglieri,
Bertrand Echenard,
Rouven Essig,
Matthew Graham,
Eder Izaguirre,
John Jaros,
Gordan Krnjaic,
Jeremy Mardon,
David Morrissey,
Tim Nelson,
Maxim Perelstein,
Matt Pyle,
Adam Ritz,
Philip Schuster,
Brian Shuve,
Natalia Toro,
Richard G Van De Water,
Daniel Akerib,
Haipeng An,
Konrad Aniol,
Isaac J. Arnquist,
David M. Asner,
Henning O. Back,
Keith Baker
, et al. (179 additional authors not shown)
Abstract:
This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years.
This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years.
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Submitted 30 August, 2016;
originally announced August 2016.
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Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment
Authors:
V. Takhistov,
K. Abe,
Y. Haga,
Y. Hayato,
M. Ikeda,
K. Iyogi,
J. Kameda,
Y. Kishimoto,
M. Miura,
S. Moriyama,
M. Nakahata,
T. Nakajima,
Y. Nakano,
S. Nakayama,
A. Orii,
H. Sekiya,
M. Shiozawa,
A. Takeda,
H. Tanaka,
T. Tomura,
R. A. Wendell,
T. Irvine,
T. Kajita,
I. Kametani,
K. Kaneyuki
, et al. (103 additional authors not shown)
Abstract:
Search results for nucleon decays $p \rightarrow e^+X$, $p \rightarrow μ^+X$, $n \rightarrow νγ$ (where $X$ is an invisible, massless particle) as well as dinucleon decays $np \rightarrow e^+ν$, $np \rightarrow μ^+ν$ and $np \rightarrow τ^+ν$ in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of 273.4 kton $\cdot$ years, a search for these decays yields a res…
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Search results for nucleon decays $p \rightarrow e^+X$, $p \rightarrow μ^+X$, $n \rightarrow νγ$ (where $X$ is an invisible, massless particle) as well as dinucleon decays $np \rightarrow e^+ν$, $np \rightarrow μ^+ν$ and $np \rightarrow τ^+ν$ in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of 273.4 kton $\cdot$ years, a search for these decays yields a result consistent with no signal. Accordingly, lower limits on the partial lifetimes of $τ_{p \rightarrow e^+X} > 7.9 \times 10^{32}$ years, $τ_{p \rightarrow μ^+X} > 4.1 \times 10^{32}$ years, $τ_{n \rightarrow νγ} > 5.5 \times 10^{32}$ years, $τ_{np \rightarrow e^+ν} > 2.6 \times 10^{32}$ years, $τ_{np \rightarrow μ^+ν} > 2.2 \times 10^{32}$ years and $τ_{np \rightarrow τ^+ν} > 2.9 \times 10^{31}$ years at a $90 \% $ confidence level are obtained. Some of these searches are novel.
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Submitted 21 September, 2015; v1 submitted 22 August, 2015;
originally announced August 2015.