منابع مشابه
0 Two pion electroproduction ∗
We have extended a model for the γN → ππN reaction to virtual photons and selected the diagrams which have a ∆ in the final state. The agreement found with the γ v p → ∆ 0 π + and γ v p → ∆ ++ π − reactions is good. The sensitivity of the results to N ∆ transition form factors is also studied. The present reaction, selecting a particular final state, is an extra test for models of the γ v N → π...
متن کاملElectroproduction of pion pairs
We study hard exclusive electroproduction of two pions in the QCD factorization approach at next-to-leading order (NLO) in the strong coupling. The pion pair can be produced both in an isovector and in an isoscalar state. The angular distribution of the produced pion pairs allows one to project out a component that depends on the interference of the isovector and isoscalar channels. Using speci...
متن کاملPion Electroproduction Using Clas
Measurements of the p(e;e p)πo reaction in the ∆(1232) resonance region have been performed with the CLAS detector at Jefferson Lab using beam energies of 1.645 and 2.445 GeV. Cross sections were measured over a range of four-momentum transfer Q2= 0.4-1.8 (GeV/c)2. Decay angular distributions in the πo p center-of-mass were obtained with full coverage in cosθ π and φ π. This permits the extract...
متن کاملPion charge radius from charged pion electroproduction
We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L01 (2) . This model-independent correction amounts to an increase of the pion charge radius squared from the electr...
متن کاملNeutral pion electroproduction off deuterium
Threshold neutral pion electroproduction on the deuteron is studied in the framework of baryon chiral perturbation theory at next-to-leading order in the chiral expansion. To this order in small momenta, the amplitude is finite and a sum of twoand three-body interactions with no undetermined parameters. We calculate the S-wave multipoles for threshold production and the deuteron S-wave cross se...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2016
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2015.11.038