scholarly journals Investigating the Prompt Photon Production at the LHC Energies

2017 ◽  
Vol 45 ◽  
pp. 1760061
Author(s):  
Glauber S. dos Santos ◽  
Magno V. T. Machado
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Photon Production ◽  
Prompt Photon ◽  
Dipole Cross Section ◽  
High Energies ◽  
Color Dipole ◽  
Momentum Distributions

We investigate the rapidity and transverse momentum distributions of the prompt photon production at the LHC energies considering the color dipole approach. We compare the predictions from distinct models for the dipole cross section, where parton saturation models at high energies are expected to be important at the forward rapidities in [Formula: see text] and [Formula: see text] collisions at the LHC.

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 Exclusive J/Ψ,ρ,ϕ and γ production at HERA and LHC within dipole models

2018 ◽  
Vol 182 ◽  
pp. 02078
Author(s):  
Agnieszka Luszczak
Keyword(s):  
Transverse Momentum ◽  
Multiple Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Heavy Nuclei ◽  
Vector Mesons ◽  
Diffractive Cross Section ◽  
Color Dipole ◽  
Diffractive Production ◽  
Momentum Distributions

We describe exclusive J/ψ,ρ,Φ and γ production at HERA and calculate cross sections and transverse momentum distributions for the incoherent diffractive production of vector mesons J/ψ and γ on heavy nuclei. Within the color dipole approach, we derive the multiple scattering expansion of the incoherent diffractive cross section as an expansion over quasielastic scatterings of the color dipole. We compare our results to the measurement of the ALICE (LHC) collaboration for incoherent J/ψ production

scholarly journals The color dipole picture for prompt photon production in pp and pPb collisions at the CERN-LHC

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
G. Sampaio dos Santos ◽  
G. Gil da Silveira ◽  
M. V. T. Machado
Keyword(s):  
Cross Section ◽  
Free Parameter ◽  
Good Description ◽  
Photon Production ◽  
Prompt Photon ◽  
Color Dipole ◽  
Gluon Saturation ◽  
Free Parameters ◽  
Parameter Approach ◽  
Dipole Picture

AbstractA study on the prompt photon production within the QCD color dipole picture with emphasis in pp and pA collisions at the LHC energy regimes is performed. We present predictions for the differential cross section as a function of photon transverse momentum at different rapidity bins considering updated phenomenological color dipole models, which take into account the QCD gluon saturation physics. The results are directly compared to the recent experimental measurements provided by CMS and ATLAS Collaborations, showing a reasonable agreement in all rapidity bins with no free parameters. Special attention is given to the IPSAT model given its good description of the data in all rapidity bins from low- to high-$$p_{T}$$ p T ranges. As a result, a free-parameter approach has succeeded in describing the LHC data for prompt photon production, while new predictions for the 13-TeV data is presented in view of new data to confirm such prospect.

scholarly journals H1jet, a fast program to compute transverse momentum distributions

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Alexander Lind ◽  
Andrea Banfi
Keyword(s):  
Transverse Momentum ◽  
Standard Model ◽  
Total Cross Section ◽  
Cross Section ◽  
New Physics ◽  
Leading Order ◽  
Current Version ◽  
Differential Distribution ◽  
The Standard Model ◽  
Momentum Distributions

AbstractWe present H1jet, a fast code that computes the total cross section and differential distribution in the transverse momentum of a colour singlet. In its current version, the program implements only leading-order $$2\rightarrow 1$$ 2 → 1 and $$2\rightarrow 2$$ 2 → 2 processes, but could be extended to higher orders. We discuss the processes implemented in H1jet, give detailed instructions on how to implement new processes, and perform comparisons to existing codes. This tool, mainly designed for theorists, can be fruitfully used to assess deviations of selected new physics models from the Standard Model behaviour, as well as to quickly obtain distributions of relevance for Standard Model phenomenology.

Transverse momentum distributions of identified particles produced in pp, p(d), and AA collisions at high energies

Pramana ◽  
2012 ◽  
Vol 79 (6) ◽  
pp. 1407-1423 ◽  
Author(s):  
YA-QIN GAO ◽  
CAI-XING TIAN ◽  
MAI-YING DUAN ◽  
BAO-CHUN LI ◽  
FU-HU LIU
Keyword(s):  
Transverse Momentum ◽  
High Energies ◽  
Momentum Distributions ◽  
Aa Collisions

scholarly journals Measurement of the Isolated Prompt Photon Production Cross Section inppCollisions ats=7  TeV

2011 ◽  
Vol 106 (8) ◽  
Author(s):  
V. Khachatryan ◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Photon Production ◽  
Prompt Photon

scholarly journals PROMPT PHOTON PRODUCTION IN p-p COLLISIONS

1995 ◽  
Vol 10 (20n21) ◽  
pp. 2941-2960 ◽  
Author(s):  
J. CLEYMANS ◽  
E. QUACK ◽  
K. REDLICH ◽  
D.K. SRIVASTAVA
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Systematic Study ◽  
Structure Functions ◽  
Photon Production ◽  
Prompt Photon ◽  
Centre Of Mass ◽  
The Cross ◽  
Photon Cross Section

A systematic study of the inclusive photon cross-section in p-p collisions is presented. The dependence of the γ rates on the renormalization and factorization scales is discussed. A comparison is made with experimental data for centre-of-mass energies ranging from 23 GeV to 1.8 TeV. Predictions of the cross-sections are given for two different sets of structure functions for RHIC and LHC energies.

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