g10 CLAS experiment

Spokesperson

Wei Chen

Abstract

We report a measurement of the differential cross section for the γ n → π− p process from the CLAS detector at Jefferson Laboratory in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (θc.m.) between 50° and 115°. We confirm a previous indication of a broad enhancement around a c.m. energy √s of 2.1 GeV at θc.m. = 90° in the scaled differential cross section s7dσ/dt and a rapid falloff in a center-of-mass energy region of about 400 MeV following the enhancement. Our data show an angular dependence of this enhancement as the suggested scaling region is approached for θc.m. from 70° to 105°.

Publication

1. W. Chen, T. Mibe, D. Dutta, H. Gao, J. M. Laget, M. Mirazita, P. Rossi, S. Stepanyan, I. I. Strakovsky, and CLAS Collaboration Measurement of the Differential Cross Section for the Reaction gamma n -> pi- p from Deuterium // Phys. Rev. Lett., 103, 012301 (2009)

Quantities

dσ/dΩ   s⁷dσ/dt

Measurements