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Keywords = parton saturation phenomenon

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17 pages, 541 KB  
Article
Non-Extensive Aspects of Gluon Distribution and the Implications for QCD Phenomenology
by Lucas S. Moriggi and Magno V. T. Machado
Physics 2025, 7(1), 5; https://doi.org/10.3390/physics7010005 - 5 Feb 2025
Viewed by 2991
Abstract
This study presents new insights into gluon transverse momentum distributions through non-extensive statistical mechanics, addressing their implications for QCD phenomenology. The saturation physics and scaling laws present in high-energy collision data are investigated as a consequence of gluon distribution modification in a high-density [...] Read more.
This study presents new insights into gluon transverse momentum distributions through non-extensive statistical mechanics, addressing their implications for QCD phenomenology. The saturation physics and scaling laws present in high-energy collision data are investigated as a consequence of gluon distribution modification in a high-density regime. This analysis explores how these modifications influence observables across different collision systems, such as proton–proton, proton–nucleus, and relativistic heavy-ion collisions. Both particle high- and low-transverse-momentum regions are successfully described in hadron production. Full article
(This article belongs to the Special Issue Complexity in High Energy and Statistical Physics)
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13 pages, 403 KB  
Article
Nuclear Modification Factor in Small System Collisions within Perturbative QCD including Thermal Effects
by Lucas Moriggi and Magno Machado
Physics 2022, 4(3), 787-799; https://doi.org/10.3390/physics4030050 - 18 Jul 2022
Cited by 4 | Viewed by 3661
Abstract
In this paper, the nuclear modification factors, RxA, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is the parton transverse momentum kT-factorization formalism for [...] Read more.
In this paper, the nuclear modification factors, RxA, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is the parton transverse momentum kT-factorization formalism for hard processes at small momentum fraction, x. Evidence for collective expansion and thermal effects for pions, produced at equilibrium, is studied based on phenomenological parametrization of blast-wave type in the relaxation time approximation. The dependencies on the centrality and on the projectile species are discussed in terms of the behavior of Cronin peak and the suppression of RxA at large transverse momentum, pT. The multiplicity of produced particles, which is sensitive to the soft sector of the spectra, is also included in the present analysis. Full article
(This article belongs to the Special Issue Jean Cleymans A Life for Physics)
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