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Cao, L.*; 谷田 聖; Belle Collaboration*; 他236名*
Physical Review D, 104(1), p.012008_1 - 012008_32, 2021/07
被引用回数:6 パーセンタイル:58.83(Astronomy & Astrophysics)We present measurements of partial branching fractions of inclusive semileptonic decays using the full Belle data set of 711 fb
of integrated luminosity at the
resonance and for
. Inclusive semileptonic
decays are CKM suppressed and measurements are complicated by the large background from CKM-favored
transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, whilst retaining access to a large fraction of the
phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about
to
of the accessible
phase space. The most inclusive measurement corresponds to the phase space with lepton energies of
GeV, and we obtain
from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find
from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations.
Sahoo, D.*; 谷田 聖; Belle Collaboration*; 他223名*
Physical Review D, 102(11), p.111101_1 - 111101_9, 2020/12
被引用回数:3 パーセンタイル:26.81(Astronomy & Astrophysics)We search for lepton-number- and baryon-number-violating decays ,
,
,
,
, and
using 921 fb
of data, equivalent to
events, recorded with the Belle detector at the KEKB asymmetric-energy
collider. In the absence of a signal, 90% confidence-level upper limits are set on the branching fractions of these decays in the range
-
. We set the world's first limits on the first four channels and improve the existing limits by an order of magnitude for the last two channels.
Kim, M. H.*; 谷田 聖; RHICf Collaboration*; 他23名*
Physical Review Letters, 124(25), p.252501_1 - 252501_6, 2020/06
被引用回数:5 パーセンタイル:48.74(Physics, Multidisciplinary)Transverse single-spin asymmetries of very forward neutral pions generated in polarized collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized
+
collisions at
= 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction
and transverse momentum
have been observed at low transverse momentum
GeV/
for the first time at this collision energy. The asymmetries show an approximate
scaling in the
region where non-perturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.
Adare, A.*; 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423名*
Physical Review D, 98(3), p.032007_1 - 032007_14, 2018/08
被引用回数:12 パーセンタイル:56.61(Astronomy & Astrophysics)We have measured the cross section and single spin asymmetries from forward production in longitudinally polarized
collisions at
GeV using the PHENIX detector at the Relativistic Heavy Ion Collider. The cross sections are consistent with previous measurements at this collision energy, while the most forward and backward longitudinal single spin asymmetries provide new insights into the sea quark helicities in the proton. The charge of the
bosons provides a natural flavor separation of the participating partons.
Adare, A.*; 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623名*
Physical Review C, 93(2), p.024911_1 - 024911_20, 2016/02
被引用回数:16 パーセンタイル:75.63(Physics, Nuclear)Measurements of the fractional momentum loss () of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using
in Au+Au and Cu+Cu collisions at
= 62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of
as a function of a number of variables: the number of participants,
, the number of quark participants,
, the charged-particle density,
, and the Bjorken energy density times the equilibration time,
. We find that the
, where
has its maximum, varies both with centrality and collision energy. Above the maximum,
tends to follow a power-law function with all four scaling variables. The data at
= 200 and 2.76 TeV, for sufficiently high particle densities, have a common scaling of
with
and
, lending insight into the physics of parton energy loss.
Han, Y.*; 長谷川 勝一; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 杉村 仁志; 谷田 聖; J-PARC E42 Collaboration*; 他23名*
JPS Conference Proceedings (Internet), 8, p.021002_1 - 021002_5, 2015/09
The famed yet elusive H-dibaryon, an exotic quark state (), was predicted several decades ago and also supported by recent Lattice QCD calculations. The E42 experiment has been approved at J-PARC to search for the H-dibaryon with high statistics. A large acceptance hyperon spectrometer with a time projection chamber (TPC) will be used for searching the H-dibaryon from
reaction off nuclei via its possible following decays such as
. The E42 experiment has high sensitivity both above and below
threshold and will be the definitive experiment on the existence of the H-dibaryon, once and for all. Recent progress and achievements of the E42 collaboration will be presented, which include simulations on estimation of TPC performance in the electric field and the magnetic field, testing and optimization of a prototype TPC, and preparation of various detectors.
Adare, A.*; 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623名*
Physical Review Letters, 115(14), p.142301_1 - 142301_9, 2015/09
被引用回数:107 パーセンタイル:96.59(Physics, Multidisciplinary)We present the first measurement of elliptic () and triangular (
) flow in high-multiplicity
He + Au collisions at
= 200 GeV. Two-particle correlations, where the particles have a large separation in pseudorapidity, are compared in
He + Au and in
collisions and indicate that collective effects dominate the second and third Fourier components for the correlations observed in the
He + Au system. The collective behavior is quantified in terms of elliptic
and triangular
anisotropy coefficients measured with respect to their corresponding event planes. The
values are comparable to those previously measured in
+ Au collisions at the same nucleon-nucleon center-of-mass energy. Comparisons with various theoretical predictions are made, including to models where the hot spots created by the impact of the three
He nucleons on the Au nucleus expand hydrodynamically to generate the triangular flow. The agreement of these models with data may indicate the formation of low-viscosity quark-gluon plasma even in these small collision systems.
斎藤 伸三; 田中 利幸; 数土 幸夫; 馬場 治; 新藤 雅美; 塩沢 周策; 茂木 春義; 大久保 実; 伊藤 昇; 新藤 隆一; et al.
JAERI 1332, 247 Pages, 1994/09
現在原研は、高温ガス炉技術基盤の確立と高度化、高温における先端的基礎研究の実施を主な目的として、高温工学試験研究炉(HTTR)の建設を進めている。HTTRは、熱出力30MW、原子炉出口冷却材温度が定格運転時850C、高温試験運転時950
Cであり、燃料・材料の各種照射試験、安全性実証試験、核熱利用に関する試験研究を行うことが計画されている。本報は、平成2年11月にHTTRの安全審査が終了し、設置許可を受けたことから、主要機器の設計の概要をまとめるとともに、関連するR&D、安全評価等について報告するものである。