Associated production of a dilepton and a $\Upsilon(J/\psi)$ at the LHC as a probe of gluon transverse momentum dependent distributions
Résumé
We discuss the impact on the study of gluon transverse momentum dependent distributions (TMDs) of the associated production of a lepton pair and a ϒ (or a J/ψ ) in unpolarised proton–proton collisions, pp→Qℓℓ¯X , at LHC energies, where one can assume that such final states are dominantly induced by gluon fusion. If the transverse momentum of the quarkonium–dilepton system – namely, the transverse momentum imbalance of the quarkonium state and the lepton pair – is small, the corresponding cross sections can be calculated within the framework of TMD factorisation. Using the helicity formalism, we show in detail how these cross sections are connected to the moments of two independent TMDs: the distribution of unpolarised gluons, f1g , and the distribution of linearly polarised gluons, h1⊥g . We complete our exhaustive derivation of these general relations with a phenomenological analysis of the feasibility of the TMD extraction, as well as some outlooks.
Mots clés
CERN LHC Coll
p p: scattering
dilepton: associated production
dilepton: transverse momentum
J/psi(3100): associated production
J/psi(3100): transverse momentum
Upsilon(9460): associated production
Upsilon(9460): transverse momentum
transverse momentum: asymmetry
gluon: fusion
gluon: distribution function
distribution function: transverse momentum dependence
p p --> J/psi(3100) lepton antilepton
p p --> Upsilon(9460) lepton antilepton