منابع مشابه
Hard 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 کاملSingle photo and electroproduction of pions at EBAC@JLAB
Within the Excited Baryon Analysis Center we have performed a dynamical coupled-channels analysis of the available p(e,e′π)N data in the region of W ≤ 1.6 GeV and Q ≤ 1.45 (GeV/c). The channels included are γ∗N , πN , ηN , and ππN which has π∆, ρN , and σN components. With the hadronic parameters of the model determined in our previous investigations of πN → πN reaction, we have found that the ...
متن کاملPomeron-Odderon interference effects in electroproduction of two pions
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a π π pair. We calculate these asymmetries originating from both longitudinal and transverse polarizations of the virtual photon, in the framework of QCD and in the Born approximation, in a kinematical domain accessible to HERA experiments. We predict a sizable cha...
متن کاملHard exclusive electroproduction of two pions and their resonances
We study the hard exclusive production of two pions in the virtual photon fragmentation region with various invariant masses including the resonance region. The amplitude is expressed in terms of two-pion light cone distribution amplitudes (2πDA’s). We derive dispersion relations for these amplitudes, which enables us to fix them completely in terms of ππ scattering phases and a few low-energy ...
متن کاملTransverse-Target Single-Spin Azimuthal Asymmetry in Hard Exclusive Electroproduction of Single Pions at HERMES
We present the analysis of data taken in the years 2002-2004 with the 27.56 GeV positron beam of the HERA storage ring at DESY and the internal transversely polarised hydrogen fixed target of the HERMES experiment. Events with a scattered positron and a produced pion are selected. Exclusive production of single pions, e+p → e+′nπ+, is ensured by requiring the missing mass in the event to be equ...
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ژورنال
عنوان ژورنال: Il Nuovo Cimento A Series 10
سال: 1967
ISSN: 0369-3546,1826-9869
DOI: 10.1007/bf02755243