scholarly journals Charged Hadron Nuclear Modification Factors in the Beam Energy Scan Data from STAR

2013 ◽  
Author(s):  
Stephen Horvat
Keyword(s):  
Beam Energy ◽  
Charged Hadron ◽  
Nuclear Modification ◽  
Nuclear Modification Factors ◽  
Scan Data ◽  
Beam Energy Scan

scholarly journals NEW RESULTS AND PERSPECTIVES ON RAA MEASUREMENTS BELOW 20 GeV CM-ENERGY AT FIXED TARGET MACHINES

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2516-2521 ◽  
Author(s):  
◽  
ANDRÁS LÁSZLÓ ◽  
ZOLTÁN FODOR ◽  
GYÓRGY VESZTERGOMBI
Keyword(s):  
Beam Energy ◽  
Fixed Target ◽  
Nuclear Modification ◽  
Momentum Spectra ◽  
Modification Factor ◽  
Transverse Momentum Spectra ◽  
Nuclear Modification Factors ◽  
Very High ◽  
Na49 Experiment ◽  
Insight Into

Transverse momentum spectra of π± at midrapidity are measured at high pT in p + p and p + Pb collisions at 158 GeV/nucleon beam energy by the NA49 experiment. This study is complementary to our previous results on the same spectra from Pb + Pb collisions. The nuclear modification factors RA+A/p+p, Rp+A/p+p and RA+A/p+A as a function of pT are extracted and compared to RHIC measurements, thus providing insight into the energy dependence of nuclear modification. The modification factor RA+A/p+A proved to be consistent with our previous results on the central to peripheral modification factor RCP. The limitation of our current pT range is discussed and planned future upgrades are outlined. Some aspects of the FAIR-CBM experiment are also presented as a natural future continuation of the measurements at very high pT.

scholarly journals Antishadowing Effect on Charmonium Production at a Fixed-Target Experiment Using LHC Beams

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kai Zhou ◽  
Zhengyu Chen ◽  
Pengfei Zhuang
Keyword(s):  
Beam Energy ◽  
Forward Rapidity ◽  
Fixed Target ◽  
Charmonium Production ◽  
Matter Effects ◽  
Nuclear Modification ◽  
Nuclear Modification Factors ◽  
Target Experiment ◽  
Transport Approach ◽  
Fixed Target Experiment

We investigate charmonium production in Pb + Pb collisions at LHC beam energyElab=2.76A TeV at fixed-target experiment (sNN= 72 GeV). In the frame of a transport approach including cold and hot nuclear matter effects on charmonium evolution, we focus on the antishadowing effect on the nuclear modification factorsRAAandrAAfor theJ/ψyield and transverse momentum. The yield is more suppressed at less forward rapidity (ylab≃2) than that at very forward rapidity (ylab≃4) due to the shadowing and antishadowing in different rapidity bins.

CENTRALITY DEPENDENCE OF CHARGED HADRON SPECTRA AT FORWARD RAPIDITIES IN Cu+Cu COLLISIONS AT $\sqrt{^SNN} = 200\ {\rm GeV}$

2007 ◽  
Vol 16 (07n08) ◽  
pp. 1896-1900
Author(s):  
◽  
SELEMON BEKELE
Keyword(s):  
Transverse Momentum ◽  
Momentum Distribution ◽  
Charged Hadron ◽  
Transverse Momentum Distribution ◽  
Significant Suppression ◽  
Centrality Dependence ◽  
Preliminary Results ◽  
Nuclear Modification ◽  
Hadron Spectra ◽  
Nuclear Modification Factors

We present preliminary results for Cu + Cu collisions at [Formula: see text] at the BRAHMS experiment from charged hadron spectra and nuclear modification factors as a function of centrality and pseudo-rapidity. Deviations from binary scaling at intermediate and high-pT reveal themselves as a suppression in the transverse momentum distribution of produced particles. The observed suppression depends on the volume of the interaction region through which produced hadrons have to travel. While there is still significant suppression, Rcp seems to depend very little on pseudo-rapidity.

scholarly journals Quarkonium measurements in heavy-ion collisions with the STAR experiment

2018 ◽  
Vol 171 ◽  
pp. 18015
Author(s):  
Xinjie Huang
Keyword(s):  
Transverse Momentum ◽  
Nuclear Matter ◽  
Heavy Ion Collisions ◽  
Theoretical Calculations ◽  
Heavy Ion ◽  
Matter Effects ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Star Experiment ◽  
Nuclear Modification Factors

In these proceedings, we present the latest measurements of J/ψ and ϒ by the STAR experiment. The J/ψ and ϒ production measured in p+p collisions provide new baselines for similar measurements in Au+Au collisions, while the measurements in p+Au collisions can help quantify the cold nuclear matter effects. The J/ψ υ2 is measured in both U+U and Au+Au collisions to place constraints on the amount of J/ψ arising from recombination of deconfined charm and anti-charm pairs. Furthermore, the nuclear modification factors for ground and excited ϒ states as a function of transverse momentum and centrality are presented, and compared to those measured at the LHC as well as to theoretical calculations.

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