A measurement of the differential cross section for the reaction $γ n \to π^{-} p$ from deuterium

Details A measurement of the differential cross section for the reaction $γ n \to π^{-} p$ from deuterium A measurement of the differential cross section for the reaction $γ n \to π^{-} p$ from deuterium

2009-03-06

arxiv.org/abs/0903.1260v1

Phys.Rev.Lett.103:012301,2009

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 3 figures. submitted to PRL

Scientific paper

10.1103/PhysRevLett.103.012301

We report a measurement of the differential cross section for the $\gamma n \to \pi^- p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\theta_{c.m.}$) between 50$^\circ$ and 115$^\circ$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\theta_{c.m.}=90^\circ$ in the scaled differential cross section, $s^7 {\frac{d\sigma}{dt}}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70$^\circ$ to 105$^\circ$.

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