Charmonia production at LHC energies in NRQCD formalism

In this work we calculate the production cross section of charmonia in p+p collisions at √s = 7 TeV using Non Relativistic QCD (NRQCD) formalism. We have calculated the differential production cross-section of prompt J/ψ and prompt ψ(2S) as a function of transverse momentum. For the J/ψ meson all the relevant contributions from higher mass states are estimated. The ψ(2S) meson does not have significant contributions from higher mass states. The calculations for prompt J/ψ and prompt ψ(2S) are compared with the measured data at LHC. A fairly good agreement between measured data and calculations is observed in low pT range. The reevaluation of LDME is in progress using latest data from LHC to achieve