Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
, 
Al, and Au collisions at 
GeVAidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他296名*
Physical Review Letters, 123(12), p.122001_1 - 122001_9, 2019/09
被引用回数：10 パーセンタイル：62.35(Physics, Multidisciplinary)We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in the production of positively-charged hadrons in polarized 
, 
Al and Au collisions at GeV. The measurements have been performed at forward rapidity (
) over the range of 
GeV
and 
. We observed a positive asymmetry 
for positively-charged hadrons in collisions, and a significantly reduced asymmetry in 
+
collisions. These results reveal a nuclear dependence of charged hadron 
in a regime where perturbative techniques are relevant. These results provide new opportunities to use A collisions as a tool to investigate the rich phenomena behind TSSAs in hadronic collisions and to use TSSA as a new handle in studying small-system collisions.
collisions at 
GeVAidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他296名*
Physical Review D, 99(9), p.092003_1 - 092003_21, 2019/05
被引用回数：7 パーセンタイル：40.94(Astronomy & Astrophysics)Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm- and bottom-quark content in 
collisions at GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in collisions provide a precision baseline for comparable forthcoming measurements in AA collisions.
