Abstract
We consider the production of J/psi and psi (2S) mesons originating from the decays of b-flavored hadrons at the LHC using the k_T-factorization approach. Our analysis covers both inclusive charmonia production and production of J/psi mesons in association with Z bosons. We apply the transverse momentum dependent (or unintegrated) gluon density in a proton derived from Catani–Ciafaloni–Fiorani–Marchesini (CCFM) evolution equation and adopt fragmentation functions based on the non-relativistic QCD factorization to describe the inclusive b-hadron decays into the different charmonium states. Our predictions agree well with latest experimental data taken by the CMS, ATLAS and LHCb Collaborations at sqrt{s} = 7, 8 and 13 TeV. The contributions from double parton scattering to the associated non-prompt J/psi + Z production are estimated and found to be small.
Highlights
A few years ago, the CMS, ATLAS and LHCb Collaborations reported the measurements of the inclusive production of J/ψ and ψ(2S) mesons originating from b-hadron dgieecsay√s s(so=ca7lleadn“dn8onT-perVom[1p–t”4]p.roMdourcetiorenc)eantttlhye, LHC enerthe LHCb
We investigated the production of J/ψ and ψ(2S) mesons, originating from the decays of b-flavored hadrons, both inclusively and in association with Z bosons, at the LHC con
Our consideration was mainly based on the dominant off-shell gluon– gluon fusion subprocesses where the transverse momenta of initial gluons are taken into account
Summary
A few years ago, the CMS, ATLAS and LHCb Collaborations reported the measurements of the inclusive production of J/ψ and ψ(2S) mesons originating from b-hadron dgieecsay√s s(so=ca7lleadn“dn8onT-perVom[1p–t”4]p.roMdourcetiorenc)eantttlhye, LHC enerthe LHCb. The role of the next-to-leading (NLO) pQCD corrections to the associated non-prompt J/ψ + Z production and contributions from the double parton scattering (DPS) mechanism were investigated very recently [11] using the MadGraph tool [12]. The main goal of our present study is to obtain first predictions for non-prompt J/ψ and ψ(2S) production, both inclusively and in association with a Z boson, employing the kT -factorization approach [13,14,15,16] and to give a systematic self-consistent analysis of recent CMS, ATLAS and LHCb data [1,2,3,4,5,6]. The kT -factorization approach has certain technical advantages in the ease of including higherorder radiative corrections that can be taken into account in the form of transverse momentum dependent (TMD) parton distributions.
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