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Marzec, E.*; 百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; et al.
Physical Review Letters, 134, p.081801_1 - 081801_9, 2025/00
被引用回数:1 パーセンタイル:0.00(Physics, Multidisciplinary)We present the first measurement of the missing energy due to nuclear effects in monoenergetic, muon neutrino charged-current interactions on carbon, originating from decay at rest (
), performed with the J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source liquid scintillator based experiment. Toward characterizing the neutrino interaction, ostensibly
or
C
N, we define the missing energy as the energy transferred to the nucleus (
) minus the kinetic energy of the outgoing proton(s),
, and relate this to visible energy in the detector,
. The missing energy, which is naively expected to be zero in the absence of nuclear effects (e.g., nucleon separation energy, Fermi momenta, and final-state interactions), is uniquely sensitive to many aspects of the interaction, and has previously been inaccessible with neutrinos. The shape-only, differential cross section measurement reported, based on a
pure double-coincidence kaon decay-at-rest signal (621 total events), provides detailed insight into neutrino-nucleus interactions, allowing even the nuclear orbital shell of the struck nucleon to be inferred. The measurement provides an important benchmark for models and event generators at hundreds of MeV neutrino energies, characterized by the difficult-to-model transition region between neutrino-nucleus and neutrino-nucleon scattering, and relevant for applications in nuclear physics, neutrino oscillation measurements, and Type-II supernova studies.
Acharya, U.*; 長谷川 勝一; 今井 憲一*; 永宮 正治*; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他572名*
Physical Review C, 102(5), p.054910_1 - 054910_11, 2020/11
被引用回数:5 パーセンタイル:43.59(Physics, Nuclear)We present direct photon-hadron correlations in 200 GeV/A AuAu,
Au and
collisions, for direct photon
from 5 - 12 GeV/
, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in
Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au
Au compared to
and
Au. As the momentum fraction decreases, the yield of hadrons in Au
Au increases to an excess over the yield in
collisions. The excess is at large angles and at low hadron
and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.
Jia, S.*; 谷田 聖; Belle Collaboration*; 他172名*
Physical Review D, 100(11), p.111103_1 - 111103_8, 2019/12
被引用回数:27 パーセンタイル:76.37(Astronomy & Astrophysics)Using a data sample of 921.9 fb collected with the Belle detector, we study the process of
via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to
with a significance of 5.9
, including the systematic uncertainties. The measured mass and width are
and
, respectively. The product of the
cross section and the branching fraction of
is measured from the
threshold to 5.59 GeV.
川崎 新吾*; 橋本 直; 谷田 聖; 他72名*
JPS Conference Proceedings (Internet), 26, p.022009_1 - 022009_5, 2019/11
The spectral shape of the baryon was measured via the in-flight
reaction at the J-PARC K1.8BR beam-line (J-PARC E31). The second E31 physics run was carried out in January and February, 2018. Approximately
kaons were irradiated on the deuteron target. The missing mass spectrum for the
where the residual final-state particles were
and
(
"
" spectrum) was measured for the first time.
浅野 秀光*; 橋本 直; 谷田 聖; 他72名*
AIP Conference Proceedings 2130, p.040018_1 - 040018_6, 2019/07
被引用回数:3 パーセンタイル:79.08(Physics, Nuclear)The structure of the hyperon is an important and long-standing issue related to the
-nucleus interaction. The J-PARC E31 experiment has been performed to investigate the
spectrum shape. Because it is hard to form the
directly by a
scattering in free space, E31 uses the
reaction with an incident kaon momentum of 1 GeV/
. We will identify three final states -
,
,
so that the isospin structure of hyperon resonance states produced can be decomposed. The first physics run of the E31 experiment was performed in 2016. To enhance the statistics of the data set, we have performed the second physics run in the beginning of 2018. During the second run of E31, around
kaons impacted on the deuteron target.
Garg, R.*; 谷田 聖; Belle Collaboration*; 他172名*
Physical Review D, 99(7), p.071102_1 - 071102_8, 2019/04
被引用回数:5 パーセンタイル:26.31(Astronomy & Astrophysics)We report the results of a search for the decays. This study is based on a data sample corresponding to an integrated luminosity of 711 fb
, collected at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider. We investigate the
invariant mass distribution in the range 4.0 to 4.6 GeV/
using both
and
decays. We find excesses of events above the background levels, with a significances of 2.1 and 0.9 standard deviations for charged and neutral
decays, respectively, taking into account the systematic uncertainties. These correspond to upper limits on the product of branching fractions,
and
at the 90% confidence level.
Wiechczynski, J.*; 谷田 聖; Belle Collaboration*; 他172名*
Physical Review D, 91(3), p.032008_1 - 032008_9, 2015/02
被引用回数:6 パーセンタイル:26.51(Astronomy & Astrophysics)We report a measurement of the and
meson decays to the
and
final states, respectively, using
pairs collected at the
resonance with the Belle detector at the KEKB asymmetric-energy
collider. Using the
,
and
decay modes for the
reconstruction, we measure the following branching fractions:
and
. We find the ratio of the branching fraction of
to that of the analogous Cabibbo-favored
decay to be
, which is consistent with the naive factorization model. We also observe a deviation of the
invariant-mass distribution from the three-body phase-space model for both studied decays.