منابع مشابه
Exclusive Electroproduction of Pentaquarks
Exclusive electroproduction of a K or K * meson on the nucleon can give a Θ + pentaquark in the final state. This reaction offers an opportunity to investigate the structure of pentaquark baryons at parton level. We discuss the generalized parton distributions for the N → Θ + transition and give the leading order amplitude for electroproduction in the Bjorken regime.
متن کاملHard Exclusive Electroproduction of Pions ∗
We investigate the exclusive electroproduction of π mesons from nucleons. To leading twist, leading order αs accuracy the corresponding production amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can be expressed in terms of quark double distribution functions of the nucleon. While the pseudovector contribution is connected to ordinary polarized quark distributions, th...
متن کاملExclusive electroproduction of pion pairs
We investigate electroproduction of pion pairs on the nucleon in the framework of QCD factorization for hard exclusive processes. We extend previous analyses by taking the hard-scattering coefficients at next-to-leading order in α s. The dynamics of the produced pion pair is described by two-pion distribution amplitudes, for which we perform a detailed theoretical and phenomenological analysis....
متن کاملFactorization for Hard Exclusive Electroproduction
The processes discussed in this talk were ep → eMp, ep → eγp, and ep → eμμp, all in the deep-inelastic region where Q is large. The factorization theorems that I will discuss provide a sound basis for the phenomenology of these processes, which was discussed extensively at this workshop. They express the amplitudes for the processes in terms of operator matrix elements and perturbatively calcul...
متن کاملTransversity via Exclusive Π–electroproduction
Exclusive π 0 electroproduction from nucleons can be related to transversity, the tensor charge, and other quantities related to transversity. This process isolates C-parity odd and chiral odd combinations of t-channel exchange quantum numbers. In a hadronic picture the meson production amplitudes for intermediate energy and Q 2 are determined by C–odd Regge exchanges with final state interacti...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 1999
ISSN: 1434-6044
DOI: 10.1007/s100520050369