Timelike Compton Scattering with CLAS12 at Jefferson Lab

Authors :: Pierre Chatagnon
Institut de Physique Nucléaire d'Orsay (IPNO)
Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
CLAS
Source :: PoS, QCD on the light cone: from hadrons to heavy ions, QCD on the light cone: from hadrons to heavy ions, Sep 2019, Palaiseau, France. pp.033, ⟨10.22323/1.374.0033⟩
Publication Year :: 2020
Publisher :: IOP Publishing, 2020.
Abstract: International audience; Generalized Parton Distributions (GPDs) describe the correlations between the longitudinal momentum and the transverse position of the partons inside the nucleon. At leading order, four quark helicity conserving GPDs per quark flavor describe the nucleon structure. For their direct relation to the angular momentum contribution of partons to the spin of the nucleon and to the pressure distribution in the nucleon, GPDs have been at the center of many experimental programs. GPDs have been studied mainly using Deeply Virtual Compton Scattering (DVCS). Here we highlight the measurement of the time-reversal conjugate process of DVCS, Timelike Compton Scattering (TCS), using data taken by CLAS12. The experimental measurement of the TCS angular asymmetry will provide new information on the real part of GPDs.This proceeding assesses the current status of the TCS analysis andpresents preliminary results based on CLAS12 data.