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

Journal Article · Wed Jul 01 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.103.012301· OSTI ID:979055

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$$^\circ$$.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 979055
• Report Number(s): JLAB-PHY-09-955; DOE/OR/23177-0644
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 01 Vol. 103; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEUTERIUM
DIFFERENTIAL CROSS SECTIONS
PHOTONS
PIONS