Deep Inelastic Scattering or Small-x Physics; Specific QCD Phenomenology; Nuclear and High Energy Physics
Abstract :
[en] Inspired by the picture portraying the KNO scaling violation as an extension of the geometrical scaling violation, the current study proposes a phenomenological model for multi-particle production in hadron collisions based on the geometrical approach and using the U-Matrix unitarization scheme of the scattering amplitude. The model has been fine-tuned and all parameters have been derived from optimal fits to various hadronic multiplicity distributions data in p + pp¯ collisions across a broad range of energies. The results have revealed that our model furnishes a reasonable description of diverse multiplicity distributions at various energies. Besides, they have demonstrated a pronounced violation of the geometrical scaling, which eventually resulted in a significant violation of the KNO scaling. The study has also analyzed the higher-order moments of the multiplicity distribution. We have observed an unexpected overestimation of the fluctuations and correlations between final state particles with increasing energy, particularly above LHC energy. It is claimed that this overestimation is due to statistical fluctuations embedded in the U-matrix scheme. The findings of this study have shed light on the key role of the U-matrix scheme in the impact of collision geometry on multi-particle production processes at high energy.
Disciplines :
Physics
Author, co-author :
Oueslati, Rami ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Trabelsi, Adel ; Tunis El Manar University, Faculty of Sciences of Tunis, Nuclear Physics and High Energy Research Unit, Tunis, Tunisia
Language :
English
Title :
The U-Matrix geometrical model for multi-particle production in high-energy hadronic collisions
Publication date :
July 2024
Journal title :
Journal of High Energy Physics
ISSN :
1126-6708
eISSN :
1029-8479
Publisher :
Springer Science and Business Media Deutschland GmbH
RO would like to thank Jean-Ren\u00E9 Cudell for his invaluable comments. RO also appreciates the insightful discussions with Paulo Cesar Beggio and Emerson Luna. Special thanks go to the computational resource provided by Consortium des \u00C9quipements de Calcul Intensif (C\u00C9CI), funded by the Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS) where a part of the computational work was carried out.
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