scholarly journals Thermal photon production in high-energy nuclear collisions

1995 ◽  
Vol 51 (3) ◽  
pp. 1460-1464 ◽  
Author(s):  
John J. Neumann ◽  
David Seibert ◽  
George Fai
Keyword(s):  
High Energy ◽  
Photon Production ◽  
Nuclear Collisions ◽  
Thermal Photon

A study on the isolated photon production in nuclear collisions at the CERN-LHC energies

2022 ◽  
Author(s):  
Glauber Sampaio dos Santos ◽  
Gustavo Gil Da Silveira ◽  
Magno Valério Trindade Machado
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion ◽  
High Energy ◽  
Photon Production ◽  
Prompt Photon ◽  
Invariant Cross Section ◽  
Geometrical Properties ◽  
Nuclear Collisions ◽  
First Case ◽  
Color Dipole

Abstract An analysis of prompt photon production in high energy nuclear collisions at the LHC is performed within the parton saturation picture taking into account the updated phenomenological color dipole models. Comparison between $\langle N_{coll}\rangle$ scaling for hard scattering in heavy-ion collisions and the $N_{part}$-scaling based on geometric scaling arguments has been done. The predictions are parameter free in the first case whereas a dependence on the constant of proportionality $\kappa$ between the number of participants and the nuclear saturation scale appears in the second case. This parameter has been analyzed in the prompt photon spectrum at small transverse momentum even though no fitting procedure was performed. Results are confronted with the measurements made by the ALICE, ATLAS, and CMS experiments in terms of photon transverse momentum at different rapidity bins. We show that the prompt photon production exhibits distinct scalings in $AA$ events associated to geometrical properties of the collision and can be properly addressed in the color dipole formalism. Based on the $N_{part}$-scaling, an analytical parametrization for the invariant cross section is provided and employed to predict the $x_T$-scaling in measurements. For $\kappa$ of order of unit the theoretical scaling curve correctly describes data in the range $x_T\leq 5\times 10^{-2}$.

scholarly journals Thermal photon to dilepton ratio in high energy nuclear collisions

2008 ◽  
Vol 78 (3) ◽  
Author(s):  
Jajati K. Nayak ◽  
Jane Alam ◽  
Sourav Sarkar ◽  
Bikash Sinha
Keyword(s):  
High Energy ◽  
Nuclear Collisions ◽  
Thermal Photon

High energy photon production in nuclear collisions

1986 ◽  
Vol 34 (6) ◽  
pp. 2190-2200 ◽  
Author(s):  
K. Nakayama ◽  
G. Bertsch
Keyword(s):  
High Energy ◽  
Photon Production ◽  
High Energy Photon ◽  
Energy Photon ◽  
Nuclear Collisions

DIRECT PHOTON PRODUCTION IN HIGH ENERGY HADRONIC AND NUCLEAR COLLISIONS: MEASURED DATA VERSUS A MODEL

2003 ◽  
Vol 18 (27) ◽  
pp. 5047-5068 ◽  
Author(s):  
P. GUPTAROY ◽  
BHASKAR DE ◽  
S. BHATTACHARYYA
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Photon Production ◽  
Direct Photon ◽  
Direct Photons ◽  
Nuclear Collisions ◽  
High Energies ◽  
Successful Attempt ◽  
Direct Photon Production ◽  
Very High

This work is in response to the stimulus received from our fairly successful attempt at understanding in the recent past the problem of direct photon production only in gold–gold and lead–lead collisions from the viewpoint of a non-standard approach. The same nonconventional formalism would, once again, be applied to analyze the vast array of measurements on the inclusive cross sections of direct photons produced in several purely nuclear or hadronuclear collisions at very high energies. Besides, some of the cross section ratios would also be calculated and be compared with data on them. All this reveals and indicates a modest agreement between the model-based calculations and the actual measurements. The authors would also endeavor here to adduce the reasons for the discrepancies, if any.

scholarly journals Multiplicity fluctuations in high energy hadronic and nuclear collisions

2006 ◽  
Vol 151 (1) ◽  
pp. 363-366 ◽  
Author(s):  
M. Rybczyński ◽  
Z. Włodarczyk ◽  
O.V. Utyuzh ◽  
G. Wilk
Keyword(s):  
High Energy ◽  
Nuclear Collisions
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