Charged particle elliptic flow in p+p collisions at LHC energies in a parton and hadron cascade model PACIAE

The parton and hadron cascade model PACIAE based on PYTHIA was used to investigate the charged particle elliptic flow in minimum bias pp collisions at the LHC energies. The strings were distributed randomly in the transverse ellipsoid of the pp collision system with major axis of R (proton radius) and minor axis of R(1−ξ) before parton rescattering. The charged particle elliptic flow as a function of the random number ξ and transverse momentum pT were investigated. The calculated v2/ε as a function of reaction energy increases monotonously with increasing reaction energy up to and then turns to saturation. With the parton–parton cross section enlarges three times artificially in parton rescattering, the rapidity integrated charged particle elliptic flow may reach 0.025 at pT∼2 GeV/c in the minimum bias pp collisions at .