Gauge invariance and factorisation in exclusive meson production
نویسندگان
چکیده
منابع مشابه
Elastic Meson Production – Factorisation and Gauge Invariance *
The factorisation of the hard amplitude for exclusive meson production in deep inelastic scattering is considered in the framework of a simple model. It is demonstrated explicitly how gauge invariance ensures the cancellation of non-factorising contributions.
متن کامل1 99 7 DAMTP - 97 - 102 October 1997 Gauge Invariance and Factorisation in Exclusive Meson Production
The structure of the nonperturbative vector meson vertex function complicates the proof of the factorisation theorem for the reaction γ * p → V p. It leads to additional contributions but, in a simple model for the vertex function, gauge invariance ensures that they cancel and factorisation is preserved.
متن کاملExclusive Meson Production at NLO
Generalized parton distributions (GPDs) are a versatile tool to quantify important aspects of hadron structure in QCD. They contain unique information on the spatial distribution of partons [1] and on the orbital angular momentum they carry in the proton [2]. The theoretically cleanest process where GPDs can be studied is deeply virtual Compton scattering (similar to inclusive DIS, which plays ...
متن کاملExclusive Meson Production at Compass
Josef Pochodzalla, Lech Mankiewicz, Murray Moinester, Gunther Piller , Andrzej Sandacz, Marc Vanderhaeghen Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany Physics Department, Technical University Munich, D-85747 Garching, Germany School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, 69978 Ramat Aviv, Israel Soltan Institute for Nuclear ...
متن کاملExclusive meson production at COMPASS
In this paper we summarize recent measurements of exclusive meson production performed by the COMPASS Collaboration. In particular, recent results on the transverse target spin asymmetries for exclusive ρ0 production are presented. Some of these asymmetries are sensitive to the GPDs E, which are related to the orbital angular momentum of quarks. Other asymmetries are sensitive to the chiral-odd...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1998
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)01413-5