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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:3 パーセンタイル:35.09(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 AuAu compared to and Au. As the momentum fraction decreases, the yield of hadrons in AuAu 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:25 パーセンタイル:79.46(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:81.79(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:3 パーセンタイル:19.39(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:28.21(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.