منابع مشابه
Soft Pion Emission in DVCS
We examine soft-pion emission in deeply virtual Compton scattering. Contrary to previous claims, we find that the amplitude for soft-pion emission is not directly related to the generalized parton distributions in the nucleon.
متن کاملComment on soft-pion emission in DVCS
The soft-pion theorem for pion production in deeply virtual Compton scattering, derived by Guichon, Mossé and Vanderhaegen, is shown to be consistent with chiral perturbation theory. Chiral symmetry requires that the nonsinglet operators corresponding to spin-independent and spindependent parton distributions have the same anomalous dimensions in cases where those operators are related by chira...
متن کاملSoft pion emission in semileptonic B-meson decays.
An analysis of semileptonic decays of B mesons with the emission of a single soft pion is presented in the framework of the heavy-quark limit using an effective Lagrangian which implements chiral and heavy-quark symmetries. The analysis is performed at leading order of the chiral and inverse heavy mass expansions. In addition to the ground state heavy mesons some of their resonances are include...
متن کاملPion-pion scattering near threshold in the Resonance-Spectrum Expansion
We study the properties of the Resonance-Spectrum Expansion near threshold in I = 0 S-wave ππ scattering. The real part of the amplitude, when extrapolated from above threshold to below threshold, is found to vanish at a positive non-zero value of the total invariant mass of the system, in agreement with predictions from perturbative chiral models. In our exact analytic expression, the total am...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1982
ISSN: 0370-2693
DOI: 10.1016/0370-2693(82)91044-9