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At least 1,117 records · Page 62
All sourcesNASA NTRSDOE OSTI
DOE OSTI2017

Υ measurements in p+p, p+Au and Au+Au collisions at $\sqrt{s}$$_ {NN}$ = 200 GeV with the STAR experiment

In these proceedings, we present the latest Υ measurements with the STAR experiment. The production cross-section in p+p and the nuclear modification factor R p A in p+Au collisions at $\sqrt{s}$$_ {NN}$ = 200GeV are obtained via the dielectron channel. These measurements provide a p+p reference with significantly improved precision and quantification of the cold nuclear matter effects for Υ measurements in heavy-ion collisions at RHIC. The nuclear modification factor R AA in Au+Au collisions at $\sqrt{s}$$_ {NN}$ = 200GeV is obtained via both the dimuon and dielectron channels. The centrality and transverse momentum dependences of Υ(1S) and Υ(2S+3S) R AA are reported and compared to those at the LHC and theoretical calculations.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2020

Jet shapes and fragmentation functions in Au+Au collisions at s NN = 200 GeV in STAR

The STAR Collaboration reports measurements of differential jet shapes and semi-inclusive jet fragmentation functions in Au+Au collisions at with the STAR detector at RHIC. Additionally, jet shapes, which represent the radial distribution of momentum carried by constituents, are measured differentially for (1) the charged particles transverse momentum and (2) the jet azimuthal angle relative to the second-order event plane. Based on the semi-inclusive population of jets recoiling from a high transverse momentum trigger hadron, jet fragmentation functions in 40-60% central heavy-ion collisions are measured, and compared to those in PYTHIA simulations for pp collisions.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗