Multiplicity dependence of the freezeout parameters in high energy hadron-hadron collisions  

作　　者：Muhammad Ajaz Majid Shehzad Muhammad Waqas Haifa I.Alrebdi Mohammad Ayaz Ahmad Antalov Jagnandan Shawn Jagnandan Murad Badshah Jalal Hasan Baker Abdul Mosawir Quraishi 

机构地区：[1]Department of Physics,Abdul Wali Khan University Mardan,Mardan 23200,Pakistan [2]School of Mathematics,Physics and Optoelectronic Engineering,Hubei University of Automotive Technology,Shiyan 442002,China [3]Department of Physics,College of Science,Princess Nourah bint Abdulrahman University,P.O.Box 84428,Riyadh 11671,Saudi Arabia [4]Department of Mathematics,Physics and Statistics,Faculty of Natural Sciences,University of Guyana,101110 Georgetown,Guyanan,South America [5]Department of Physics,Faculty of Science,University of Tabuk,Tabuk,Kingdom of Saudi Arabia [6]Department of Electrical Engineering,College of Engineering,Qassim University,Unaizah,Saudi Arabia

出　　处：《Chinese Physics C》2024年第5期124-133,共10页中国物理C（英文版）

基　　金：Supported by Princess Nourah bint Abdulrahman University,Researchers Supporting Project Number PNURSP2024R106;Princess Nourah bint Abdulrahman University,Riyadh,Saudi Arabia;We would like to express our gratitude for the support received from Abdul Wali Khan University Mardan,Pakistan;Hubei Uni versity of Automotive Technology,Doctoral Research Fund number BK202313;University of Guyana;University of Tabuk,Saudi Arabia and Qassim University,Saudi Arabia,whichhave contributed to creating a conducive research environment.

摘　　要：We examined the transverse momentum(pT)spectra of various identified particles,encompassing both light-flavored and strange hadrons(π++π−,K++K−,p+p¯,ϕ,K0s,Λ+Λ¯,Ξ−+Ξ¯+,andΩ−+Ω¯+),across different multiplicity classes in proton-proton collisions(p-p)at a center-of-mass energy of s√=7 TeV.Utilizing the Tsallis and Hagedorn models,parameters relevant to the bulk properties of nuclear matter were extracted.Both models exhibit good agreement with experimental data.In our analyses,we observed a consistent decrease in the effective temperature(T)for the Tsallis model and the kinetic or thermal freeze-out temperature(T0)for the Hagedorn model,as we transitioned from higher multiplicity(class-I)to lower multiplicity(class-X).This trend is attributed to the diminished energy transfer in higher multiplicity classes.Additionally,we observed that the transverse flow velocity(βT)experiences a decline from class-I to class-X.The normalization constant,which represents the multiplicity of produced particles,was observed to decrease as we moved toward higher multiplicity classes.While the effective and kinetic freeze-out temperatures,as well as the transverse flow velocity,show a mild dependency on multiplicity for lighter particles,this dependency becomes more pronounced for heavier particles.The multiplicity parameter for heavier particles was observed to be smaller than that of lighter particles,indicating a greater abundance of lighter hadrons compared to heavier ones.Various particle species were observed to undergo decoupling from the fireball at distinct temperatures:lighter particles exhibit lower temperatures,while heavier ones show higher temperatures,thereby supporting the concept of multiple freeze-out scenarios.Moreover,we identified a positive correlation between the kinetic freeze-out temperature and transverse flow velocity,a scenario where particles experience stronger collective motion at a higher freeze-out temperature.The reason for this positive correlation is that,as the multiplicity i

关 键 词：multiplicity dependence collective properties thermal energy 

分 类 号：O57[理学—粒子物理与原子核物理]