{"title":"Pair Production of Charmonia in the LHCb Experiment in the Parton Reggeization Approach","authors":"V. A. Saleev, A. A. Chernyshev","doi":"10.1134/S1063779624701685","DOIUrl":null,"url":null,"abstract":"<p>Pair production of prompt <span>\\(1S\\)</span> and <span>\\(2S\\)</span> charmonia states is studied in the improved color evaporation model using high energy factorization as formulated in the Parton Reggeization Approach. The latter is based on the modified Kimber–Martin–Ryskin–Watt model for unintegrated parton distribution functions and Lipatov’s effective theory for processes in multi-Regge kinematics. We predict cross sections for pair <span>\\(\\psi [1S] + \\psi [1S,2S]\\)</span> production by considering processes of single and double parton scattering and using the set of model parameters fixed earlier in the description of pair <span>\\(1S\\)</span>-charmonia states production at the LHC energies. Numerical calculations at the parton level were conducted using Monte Carlo event generator KaTie. Results of calculations are compared with recent LHCb Collaboration data at <span>\\(\\sqrt s = 13\\)</span> TeV.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"387 - 392"},"PeriodicalIF":0.6000,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Particles and Nuclei","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063779624701685","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, PARTICLES & FIELDS","Score":null,"Total":0}
引用次数: 0
Abstract
Pair production of prompt \(1S\) and \(2S\) charmonia states is studied in the improved color evaporation model using high energy factorization as formulated in the Parton Reggeization Approach. The latter is based on the modified Kimber–Martin–Ryskin–Watt model for unintegrated parton distribution functions and Lipatov’s effective theory for processes in multi-Regge kinematics. We predict cross sections for pair \(\psi [1S] + \psi [1S,2S]\) production by considering processes of single and double parton scattering and using the set of model parameters fixed earlier in the description of pair \(1S\)-charmonia states production at the LHC energies. Numerical calculations at the parton level were conducted using Monte Carlo event generator KaTie. Results of calculations are compared with recent LHCb Collaboration data at \(\sqrt s = 13\) TeV.
期刊介绍：
The journal Fizika Elementarnykh Chastits i Atomnogo Yadr of the Joint Institute for Nuclear Research (JINR, Dubna) was founded by Academician N.N. Bogolyubov in August 1969. The Editors-in-chief of the journal were Academician N.N. Bogolyubov (1970–1992) and Academician A.M. Baldin (1992–2001). Its English translation, Physics of Particles and Nuclei, appears simultaneously with the original Russian-language edition. Published by leading physicists from the JINR member states, as well as by scientists from other countries, review articles in this journal examine problems of elementary particle physics, nuclear physics, condensed matter physics, experimental data processing, accelerators and related instrumentation ecology and radiology.
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