Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Heavy Ion Collisions and QCD Phases XI

HK 58.8: Vortrag

Freitag, 31. März 2017, 16:00–16:15, F 1

Color transparency in semiexclusive A,l+l) process — •Alexei Larionov1, Mark Strikman2, and Marcus Bleicher3,41National Research Center "Kurchatov Institute", 123182 Moscow, Russia — 2Pennsylvania State University, University Park, PA 16802, USA — 3Frankfurt Institute for Advanced Studies (FIAS), D-60438 Frankfurt am Main, Germany — 4Institut für Theoretische Physik, J.W. Goethe-Universität, D-60438 Frankfurt am Main, Germany

Color transparency (CT) phenomenon is known as a suppression of the interaction of small color singlet q q or qqq configurations with nucleons. The CT is expected when the quark configuration was created in a large momentum transfer process. Apart from being of interest by itself as a genuine QCD effect, the observation of CT in the processes with nuclear targets is a necessary condition for the corresponding elementary process to be describable within the factorization technique. In this talk we consider the possible CT effect in the semiexclusive A,l+ l) process at plab=15−20 GeV/c at small |t| and large invariant mass of the dilepton pair l+ l [1]. Based on the size of the pionic q q configuration extracted from the semiexclusive A(e,eπ+) process measured at JLab, we predict very significant CT effects in A,l+ l) reaction. The observation of these CT effects would provide an additional confidence on the possibility to extract the generalized parton distributions of the nucleon from the elementary reaction π pl+ l n at similar kinematics.

[1] A.B. Larionov, M. Strikman, M. Bleicher, Phys. Rev. C 93 (2016) 034618; arXiv:1601.00189

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