Prompt etac meson production at the LHC in the NRQCD with kt -factorizationстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 сентября 2019 г.
Аннотация:In the framework of the kt-factorization approach, the prompt production of etac mesons at the LHC conditions is studied. Our consideration is based on the off-shell amplitudes for hard partonic subprocesses and on the nonrelativistic QCD (NRQCD) formalism for the formation of bound states. We try two latest parametrizations for noncollinear, or transverse momentum dependent (TMD) gluon densities derived from the Catani–Ciafaloni–Fiorani–Marchesini (CCFM) equation. We use the values of the nonperturbative matrix elements obtained from a combined fit of the etac and J/psi differential cross sections. Finally, we show an universal set of parameters that provides a reasonable simultaneous description for all of the available data on the prompt J/psi and etac production at the LHC.