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Extension of the J-PARC Hadron Experimental Facility: Third White Paper
Authors:
Kazuya Aoki,
Hiroyuki Fujioka,
Toshiyuki Gogami,
Yoshimasa Hidaka,
Emiko Hiyama,
Ryotaro Honda,
Atsushi Hosaka,
Yudai Ichikawa,
Masaharu Ieiri,
Masahiro Isaka,
Noriyoshi Ishii,
Takatsugu Ishikawa,
Yusuke Komatsu,
Takeshi Komatsubara,
GeiYoub Lim,
Koji Miwa,
Yuhei Morino,
Tomofumi Nagae,
Sho Nagao,
Satoshi N. Nakamura,
Hajime Nanjo,
Megumi Naruki,
Hidekatsu Nemura,
Tadashi Nomura,
Hiroyuki Noumi
, et al. (18 additional authors not shown)
Abstract:
The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beams. In the past decade, many results on particle and nuclear physics have been obtained at the present facility. To expand the physics programs to unexplored regions never achieved, the extension project of the Hadron Exp…
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The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beams. In the past decade, many results on particle and nuclear physics have been obtained at the present facility. To expand the physics programs to unexplored regions never achieved, the extension project of the Hadron Experimental Facility has been extensively discussed. This white paper presents the physics of the extension of the Hadron Experimental Facility for resolving the issues in the fields of the strangeness nuclear physics, hadron physics, and flavor physics.
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Submitted 9 October, 2021;
originally announced October 2021.
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Performance of RHICf detector during operation in 2017
Authors:
O. Adriani,
E. Berti,
L. Bonechi,
R. D' Alessandro,
Y. Goto,
B. Hong,
Y. Itow,
K. Kasahara,
M. H. Kim,
H. Menjo,
I. Nakagawa,
T. Sako,
N. Sakurai,
K. Sato,
R. Seidl,
K. Tanida,
S. Torii,
A. Tricomi
Abstract:
In the RHIC forward (RHICf) experiment, an operation with pp collisions was performed at $\sqrt{s}\,=\,$510 GeV from 24-27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetr…
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In the RHIC forward (RHICf) experiment, an operation with pp collisions was performed at $\sqrt{s}\,=\,$510 GeV from 24-27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetry measurements of very forward photons, $π^0$s, and neutrons were satisfied. In this paper, we describe the details of these studies.
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Submitted 2 August, 2021;
originally announced August 2021.
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First observation of a nuclear $s$-state of $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$
Authors:
M. Yoshimoto,
J. K. Ahn,
B. Bassalleck,
H. Ekawa,
Y. Endo,
M. Fujita,
Y. Han,
T. Hashimoto,
S. H. Hayakawa,
K. Hicks,
K. Hoshino,
S. Hoshino,
S. H. Hwang,
Y. Ichikawa,
M. Ichikawa,
K. Imai,
Y. Ishikawa,
H. Kanauchi,
A. Kasagi,
S. H. Kim,
S. Kinbara,
P. M. Lin,
T. L. Ma,
K. Miwa,
A. T. Moe
, et al. (24 additional authors not shown)
Abstract:
Bound-systems of $Ξ^-$--$^{14}_{}{\rm N}$ are studied via $Ξ^-$ capture at rest followed by emission of a twin single-$Λ$ hypernucleus in the emulsion detectors. Two events forming extremely deep $Ξ^-$ bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as…
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Bound-systems of $Ξ^-$--$^{14}_{}{\rm N}$ are studied via $Ξ^-$ capture at rest followed by emission of a twin single-$Λ$ hypernucleus in the emulsion detectors. Two events forming extremely deep $Ξ^-$ bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as $Ξ^-+^{14}_{}{\rm N}\to^{5}_Λ{\rm He}$+$^{5}_Λ{\rm He}$+$^{4}_{}{\rm He}$+n. Since there are no excited states for daughter particles, the binding energy of the $Ξ^-$ hyperon, $B_{Ξ^-}$, in $^{14}_{}{\rm N}$ nucleus was uniquely determined to be 6.27 $\pm$ 0.27 MeV. Another $Ξ^-$--$^{14}_{}{\rm N}$ system via the decay $^{9}_Λ{\rm Be}$ + $^{5}_Λ{\rm He}$ + n brings a $B_{Ξ^-}$ value, 8.00 $\pm$ 0.77 MeV or 4.96 $\pm$ 0.77 MeV, where the two possible values of $B_{Ξ^-}$ correspond to the ground and the excited states of the daughter $^{9}_Λ{\rm Be}$ nucleus, respectively. Because the $B_{Ξ^-}$ values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear $1p$ state of the $Ξ^-$--$^{14}_{}{\rm N}$ system, these new events give the first indication of the nuclear $1s$ state of the $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$.
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Submitted 26 May, 2021; v1 submitted 15 March, 2021;
originally announced March 2021.
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Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC
Authors:
J. Zmeskal,
M. Sato,
S. Ajimura,
M. Bazzi,
G. Beer,
C. Berucci,
H. Bhang,
D. Bosnar,
M. Bragadireanu,
P. Buehler,
L. Busso,
M. Cargnelli,
S. Choi,
A. Clozza,
C. Curceanu,
A. D'uffizi,
S. Enomoto,
L. Fabbietti,
D. Faso,
C. Fiorini,
H. Fujioka,
F. Ghio,
R. Golser,
C. Guaraldo,
T. Hashimoto
, et al. (52 additional authors not shown)
Abstract:
The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and…
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The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and width of the kaonic deuterium 1s state with an accuracy of 60 eV and 140 eV respectively at J-PARC. These results together with the kaonic hydrogen data (KpX at KEK, DEAR and SIDDHARTA at DAFNE) will then permit the determination of values of both the isospin I=0 and I=1 antikaon-nucleon scattering lengths and will provide the most stringent constraints on the antikaon-nucleon interaction, promising a breakthrough. Refined Monte Carlo studies were performed, including the investigation of background suppression factors for the described setup. These studies have demonstrated the feasibility of determining the shift and width of the kaonic deuterium atom 1s state with the desired accuracy of 60 eV and 140 eV.
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Submitted 22 January, 2015;
originally announced January 2015.
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Proposal; Precise measurements of very forward particle production at RHIC
Authors:
Y. Itow,
H. Menjo,
T. Sako,
N. Sakurai,
K. Kasahara,
T. Suzuki,
S. Torii,
O. Adriani,
L. Bonechi,
R. D'Alessandro,
G. Mitsuka,
A. Tricomi,
Y. Goto,
K. Tanida
Abstract:
We propose a new experiment Relativistic Heavy Ion Collider forward (RHICf) for the precise measurements of very forward particle production at RHIC. The proposal is to install the LHCf Arm2 detector in the North side of the ZDC installation slot at the PHENIX interaction point. By installing high-resolution electromagnetic calorimeters at this location we can measure the spectra of photons, neutr…
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We propose a new experiment Relativistic Heavy Ion Collider forward (RHICf) for the precise measurements of very forward particle production at RHIC. The proposal is to install the LHCf Arm2 detector in the North side of the ZDC installation slot at the PHENIX interaction point. By installing high-resolution electromagnetic calorimeters at this location we can measure the spectra of photons, neutrons and pi0 at pseudorapidity eta>6.
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Submitted 16 September, 2014;
originally announced September 2014.
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Letter of intent; Precise measurements of very forward particle production at RHIC
Authors:
Y. Itow,
H. Menjo,
G. Mitsuka,
T. Sako,
K. Kasahara,
T. Suzuki,
S. Torii,
O. Adriani,
A. Tricomi,
Y. Goto,
K. Tanida
Abstract:
In this paper, we propose an experiment for the precise measurements of very forward particle production at RHIC. The proposal is to install a LHCf-like calorimeter in the ZDC installation slot at one of the RHIC interaction points. By installing a high-resolution electromagnetic calorimeter at this location we measure the spectra of photons, neutrons and pi0 at pseudo rapidity eta above 6.
The…
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In this paper, we propose an experiment for the precise measurements of very forward particle production at RHIC. The proposal is to install a LHCf-like calorimeter in the ZDC installation slot at one of the RHIC interaction points. By installing a high-resolution electromagnetic calorimeter at this location we measure the spectra of photons, neutrons and pi0 at pseudo rapidity eta above 6.
The new measurements at 500 GeV p-p collisions contribute to improve the hadronic interaction models used in the cosmic-ray air shower simulations. Using a similar kinematic coverage at RHIC to that of the measurements at LHC, we can test the Feynman scaling with a wide energy range and make the extrapolation of models into cosmic-ray energy more reliable. Combination of a high position resolution of the LHCf detector and a high energy resolution of the ZDC makes it possible to determine pT of forward neutrons with the ever best resolution. This enables us to study the forward neutron spin asymmetry discovered at RHIC in more detail.
Another new experiment expected at RHIC is world-first light-ion collisions. Cosmic-ray interaction models have been so far tested with accelerator data, but colliders have provided only p-p and heavy-ion collisions. To simulate the interaction between cosmic-ray particles and atmosphere, collision of light ions like nitrogen is a ultimate goal for the cosmic-ray physics. We propose 200 GeV p-N collisions together with 200 GeV p-p collisions to study the nuclear effects in the forward particle production.
The experiment can be performed by using the existing LHCf detector. Considering the geometry and response of one of the LHCf detectors, we propose some short dedicated operations. Ideal beam conditions are summarized in this paper. Our basic idea is to bring one of the LHCf detectors to RHIC and then operate from 2016 season at RHIC.
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Submitted 6 January, 2014;
originally announced January 2014.