Novel hard semiexclusive processes and color singlet clusters in hadrons

Abstract

Hard scattering to a three cluster final state is suggested as a method to probe configurations in hadrons containing small size color singlet cluster and a residual quark-gluon system of a finite mass. Examples of such processes include $e+N\to e+p+M_X(\Lambda +M_X^{\prime }),p+p\to p+p+M_X(p+\Lambda +M_X^{\prime })$ where $M_X(M_X^{\prime })$ could be a pion(kaon) or other state of finite mass which does not increase with momentum transfer ($Q^2$). We argue that different models of the nucleon may lead to very different qualitative predictions for the spectrum of states $M_X$. We find that in the pion model of nonperturbative $q\bar{q}$ sea in a nucleon the cross section of these reactions is comparable to the cross section of the corresponding two-body reaction. Studies of these reactions are feasible using both fixed target detectors (EVA at BNL, HERMES at DESY) and collider detectors with a good acceptance in the forward direction.

9 pages, 2 figures, to be published in the proceedings of the Workshop: Exclusive Processes at High Momentum Transfer, Newport News, Virginia, 15-18 May 2002

References in corpus (2)

• Two-gluon form factor of the nucleon and $J/\psi$ photoproduction
• Introduction to QCD Sum Rule Approach

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• Nucleon-to-pion transition distribution amplitudes and backward electroproduction of pions
• Exploring the nucleon structure through GPDs and TDAs in hard exclusive processes