Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
hadrons in nucleus-nucleus collisions at 
from 62.4 GeV to 2.76 TeVAdare, 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：17 パーセンタイル：75.53(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.
He + Au collisions at = 200 GeVAdare, 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：112 パーセンタイル：96.51(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.
