scholarly journals Recent Results from The Phenix Collaboration At RHIC

2017 ◽  
Author(s):  
Alexandre Lebedev ◽  
Keyword(s):  
Phenix Collaboration

Study the early stage of heavy ion collisions with direct photons

2014 ◽  
Vol 29 ◽  
pp. 1460230 ◽  
Author(s):  
Fu-Ming Liu ◽  
Sheng-Xu Liu
Keyword(s):  
Collective Motion ◽  
Early Stage ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Transverse Momentum Spectrum ◽  
Direct Photons ◽  
Ion Collisions ◽  
Phenix Collaboration ◽  
Early Beginning ◽  
Hadronic Data

Based on the modelling of the collective motion in AuAu collisions at [Formula: see text] at centrality 0-20% and 20-40% and PbPb collisions at [Formula: see text] at centrality 0-40% with a 3+1D event-averaged ideal hydrodynamics constrained with hadronic data, we study the transverse momentum spectrum and elliptic flow of direct photons and find that the recent direct photon data from both PHENIX collaboration at RHIC and ALICE collaboration at LHC favour an early beginning of collective expansion (τ0 < 0.6 fm/c) and a late formation of quark gluon plasma (τ ~ 2 fm/c).

scholarly journals Scaling properties of direct photon yields in heavy ion collisions

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Vladimir Khachatryan ◽  
Michał Praszałowicz
Keyword(s):  
Scaling Laws ◽  
Heavy Ion ◽  
Charged Hadron ◽  
Direct Photon ◽  
Recent Analysis ◽  
Scaling Properties ◽  
Ion Collisions ◽  
Phenix Collaboration ◽  
Measurement Results ◽  
Photon Spectra

Abstract A recent analysis from the PHENIX collaboration of available direct photon measurement results in collisions of various systems such as Au+Au, Cu+Cu, and Pb+Pb, at different beam energies ranging from 39 to 2760 GeV, has shown a universal, within experimental uncertainties, multiplicity scaling, in which direct photon $$p_{T}$$pT-spectra for transverse momenta up to 2 GeV/c are scaled with charged hadron pseudorapidity density at midrapidity raised to power $$\alpha =1.25$$α=1.25. On the other hand, those direct photon $$p_{T}$$pT-spectra also exhibit geometrical scaling in the similar $$p_{T}$$pT range. Assuming power-law dependence of the scaled photon spectra for both scaling laws, we formulate two independent conditions for the power $$\alpha $$α, which overshoot experimental data by $$\sim 10\%$$∼10% on average. We discuss possible sources that might improve this estimate.

EXCLUSIVE D+D- PAIR PRODUCTION IN THE AA → AAD+D- REACTION

2011 ◽  
Vol 26 (03n04) ◽  
pp. 677-678
Author(s):  
MARTA ŁUSZCZAK ◽  
ANTONI SZCZUREK
Keyword(s):  
Fourier Transform ◽  
Charge Density ◽  
Pair Production ◽  
Cross Sections ◽  
Form Factors ◽  
Charge Form ◽  
Phenix Collaboration ◽  
The Cross ◽  
Meson Pair

The cross sections for exclusive D+D- meson pair production in nucleus - nucleus collisions are calculated and differential distributions are shown. Realistic (Fourier transform of the charge density) charge form factors of nuclei are used. Absorption effects are included. Predictions for the STAR and PHENIX collaboration measurements at RHIC are presented.

PHENIX Collaboration

2021 ◽  
Vol 1005 ◽  
pp. 122094
Author(s):  
U.A. Acharya ◽  
A. Adare ◽  
C. Aidala ◽  
N.N. Ajitanand ◽  
Y. Akiba ◽  
...  
Keyword(s):  
Phenix Collaboration

scholarly journals THE WAKE IN MID-CENTRAL NUCLEAR COLLISIONS

2010 ◽  
Vol 25 (08) ◽  
pp. 591-595 ◽  
Author(s):  
I. M. DREMIN
Keyword(s):  
Particle Correlations ◽  
Nuclear Collisions ◽  
Phenix Collaboration ◽  
Special Orientation ◽  
First Time

It is argued that PHENIX collaboration observed for the first time the radiation of the longitudinal wake oscillations formed behind the parton penetrating the quark–gluon medium. It shifts the maximum of a hump in two-particle correlations and changes its width in the case of some special orientation of the trigger particle.

PHENIX Collaboration

2014 ◽  
Vol 931 ◽  
pp. 1230-1236
Author(s):  
A. Adare ◽  
S. Afanasiev ◽  
C. Aidala ◽  
N.N. Ajitanand ◽  
Y. Akiba ◽  
...  
Keyword(s):  
Phenix Collaboration
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