Quark model description of quasi-elastic pion knockout from the proton at JLAB

Details Quark model description of quasi-elastic pion knockout from the proton at JLAB Quark model description of quasi-elastic pion knockout from the proton at JLAB

2005-06-30

arxiv.org/abs/hep-ph/0506319v3

Phys.Lett. B634 (2006) 220-226

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures, to be published in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.01.038

The interference term between s- and t-pole contributions to the p(e,e' pi+)n cross section is evaluated on the basis of the constituent quark model. It is shown that the contribution of baryon s-poles can be modeled by a nonlocal extension of the Kroll-Rudermann contact term. This contribution is in a destructive interference with the pion t-pole that is essential to improve the description of recent JLab data at the invariant mass W=1.95 GeV. Some predictions are made for a new JLab measurement at higher values W=2.1-2.3 GeV and Q2 centered at 1.6 and 2.45 GeV2/c2.

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