ψ(2S) and J/ψ production in pp collisions at √s= 7, 8 and 13 TeV

Authors : Yasir ALI, Uzma TABASSAM, Syed Uzair AHMED SHAH, Atif ARIF, Mais SULEYMANOV, Zain ZAİN

Pages : 90-104

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Proton-proton collision is an essential part of high energy physics, as it is a baseline for nucleus-nucleusand hadron-nucleus collisions. Quark-gluon plasma, an exotic state of strongly interacting QCD matter, is routinelyproduced in heavy nuclei high-energy collisions. Charmonium, the bound states ofc ̄cproduced at the early stages ofcollisions, are nice probes to examine the properties of matter through which they pass. The differential cross-sectionsof inclusiveψinsert ignore into journalissuearticles values(2S);in pp collisions at energies of√s= 7, 8 and 13 TeV have been studied. PYTHIA 8.1 event generatoris used for the simulation of data. The differential cross-section of inclusiveJ/ψis also presented in order to examinetheψinsert ignore into journalissuearticles values(2S);toJ/ψratio at similar energies. Both charmonium states are simulated in dimuon insert ignore into journalissuearticles values(μ+μ−); decay channel.The simulated data is also compared with the ALICE and LHCb experimental data based at LHC. We have plotted thedifferential cross-section as a function of transverse momentum insert ignore into journalissuearticles values(pT); and rapidityy. PYTHIA simulation is found tobe in good agreement with ALICE data for lowpTinterval, y interval close to midrapidity, while PYTHIA agrees withLHCb data at lowpTinterval. It is observed that the LHCb differential cross-section distributions ofJ/ψandψinsert ignore into journalissuearticles values(2S);as a function of y are lower compared to the ALICE data distributions and PYTHIA simulations. Theψinsert ignore into journalissuearticles values(2S);toJ/ψratio is also well explained by PYTHIA and shows an increase in production of inclusiveJ/ψas compared to inclusiveψinsert ignore into journalissuearticles values(2S);.
Keywords : Quark gluon plasma, charmonium, differential cross section, transverse momentum, PYTHIA