Hard Exclusive Processes
نویسندگان
چکیده
منابع مشابه
Hard exclusive wide-angle processes
In this talk the handbag approach to hard exclusive wide-angle processes is reviewed and applications, as for instance two-photon annihilations into pairs of mesons, are discussed. 1 Handbag factorization Factorization properties of QCD allow us to calculate exclusive processes provided a hard scale is available, either the three Mandelstam variables s,−t,−u are large as compared to a typical h...
متن کاملHard Exclusive and Diffractive Processes in QCD
Exclusive and semi-exclusive processes, the diffractive dissociation of hadrons into jets, and hard diffractive processes such as vector meson leptoproduction provide new testing grounds for QCD and essential information on the structure of light-cone wavefunctions of hadrons, particularly the pion distribution amplitude. I review the basic features of the leading-twist QCD predictions and the ...
متن کاملGeneralized counting rule for hard exclusive processes.
We derive a generalized counting rule for hard exclusive processes involving parton orbital angular momentum and hadron helicity flip. We start with a systematic way to enumerate the Fock components of a hadronic light-cone wave function with n partons and orbital angular momentum projection l(z). We show that the wave-function amplitude psi(n)(x(i),k(i perpendicular ),l(zi)) has a leading beha...
متن کاملHe Structure from Coherent Hard Exclusive Processes
Hard exclusive processes, such as deep electroproduction of photons and mesons off nuclear targets, could give access, in the coherent channel, to nuclear generalized parton distributions (GPDs). Here, a realistic microscopic calculation of the unpolarized quark GPD H3 q of the 3He nucleus is reviewed. In Impulse Approximation, H3 q is obtained as a convolution between the GPD of the internal n...
متن کاملDispersion representations for hard exclusive processes: beyond the Born approximation
Several hard exclusive scattering processes admit a description in terms of generalized parton distributions and perturbative hard-scattering kernels. Both the physical amplitude and the hard-scattering kernels fulfill dispersion relations. We give a detailed investigation of their consistency at all orders in perturbation theory. The results shed light on the information about generalized part...
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ژورنال
عنوان ژورنال: Acta Physica Polonica B Proceedings Supplement
سال: 2013
ISSN: 1899-2358,2082-7865
DOI: 10.5506/aphyspolbsupp.6.587