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(π−,l+l−) process — •Alexei Larionov1, Mark Strikman2, and Marcus Bleicher3,4 — 1National 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(π−,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,e′π+) process measured at JLab, we predict very significant CT effects in A(π−,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− p → l+ l− n at similar kinematics.
[1] A.B. Larionov, M. Strikman, M. Bleicher, Phys. Rev. C 93 (2016) 034618; arXiv:1601.00189