Statut  Confirmé 
Série  IPNX 
Domaines  hepph 
Date  Jeudi 7 Décembre 2017 
Heure  11:00 
Institut  CPHT 
Salle  Salle de conférences Louis Michel, bât. 6 
Nom de l'orateur  Cotogno 
Prenom de l'orateur  Sabrina 
Addresse email de l'orateur  
Institution de l'orateur  NIKHEF & Vrije U., Amsterdam 
Titre  Gluon distributions in polarized hadrons of spin < =1 
Résumé  Besides being indispensable tools in the analysis of high energy scattering processes, parton distributions contain information on the basic structure of hadrons, both in coordinate and momentum space. The full threedimensional quark and gluon picture in momentum space is encoded in the Transverse Momentum Dependent Parton Distribution Functions (TMDPDF), or simply TMDs, which appear in the parametrization of the correlator. In the case of gluons, the latter is a nonlocal matrix element containing gluon field operators and Wilson lines (also called gauge links), bridging the nonlocality to guarantee color gauge invariance. Recently, we have considered gluons inside (un)polarized hadrons of spin up to 1, and established relations between the gluon TMDs, about which very little, or almost nothing, is currently known. In fact, these quantities are typically dominated by the valence quark ones, as far as present experimental facilities are concerned. At high energy, i.e. low parton momentum x, gluon distributions are the dominant ones and they need special attention. We find that in the smallx limit, the gluon correlator with a specific gauge link structure (dipoletype) reduces to the matrix element of a single closed Wilson loop operator, where explicit gluon fields are absent. The gluon TMDs are either suppressed or they become proportional to the functions appearing in the parametrization of the Wilson loop correlator. 
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