منابع مشابه
Hard exclusive reactions and hadron structure
According to a now well established framework [1], the Bjorken limit of exclusive reactions with a hard probe allows factorization of the amplitudes into a perturbatively calculable subprocess at quark and gluon level on the one hand and hadronic matrix elements of light cone non local operators expressed through hadron (eventually generalized [2]) distribution amplitudes and generalized parton...
متن کاملHard Exclusive Reactions and the Structure of Hadrons
We outline in detail the properties of generalized parton distributions (GPDs), which contain new information on the structure of the nucleon and which enter the description of hard exclusive reactions. We highlight the physics content of the GPDs and discuss the quark GPDs in the large Nc limit and within the context of the chiral quark-soliton model. Guided by this physics, we then present a ...
متن کاملExclusive Reactions in QCD
We review the theory of hard exclusive scattering in Quantum Chromodynamics. After recalling the classical counting rules which describe the leading scale dependence of form factors and exclusive cross-sections at fixed angle, the pedagogical example of the pion form factor is developped in some detail in order to show explicitely what factorization means in the QCD framework. The picture gener...
متن کاملExclusive hard reactions and QCD
Exclusive reactions at large momentum transfer allow to probe the structure of hadrons, in particular of the pion and nucleon, on the amplitude level. They are challenging both the experimental measurements and the theoretical understanding of Quantum Chromodynamics. We shortly introduce the concept of factorization, emphasize the importance of new experimental nucleon and photon-to-pion form f...
متن کاملHard Quark-quark Scattering with Exclusive Reactions
We present data from ir~p •*• elastic and p~p final states for scattering at 90° center of mass, -t = 9 GeV/c. A large p~p signal is seen and the p" are strongly polarized. This polarization tests a QCD prediction that quarks cannot flip helicity. The test fails dramatically. Exclusive two-body to two-body scattering at large momentum transfer represents a new laboratory for the study of hard s...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1973
ISSN: 0033-068X
DOI: 10.1143/ptp.50.626