Measurement of the Differential Cross Section for the Reaction gamman->pi{sup -}p from Deuterium

Journal Article · Fri Jul 03 04:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.012301· OSTI ID:21347017

Chen, W; Gao, H ^[1]; Mibe, T; Daniel, A; Hicks, K; Keller, D ^[2]; Dutta, D ^[3]; Laget, J M ^[4]; Mirazita, M; Rossi, P; De Sanctis, E; Pereira, S Anefalos ^[5]; Stepanyan, S; Burkert, V D; Carman, D S; Deur, A; Kubarovsky, V; Weygand, D P; Yegneswaran, A ^[6]; Strakovsky, I I ^[7]

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1. Duke University, Durham, North Carolina 27708 (United States)
2. Ohio University, Athens, Ohio 45701 (United States)
3. Mississippi State University, Mississippi State, Mississippi 39762 (United States)
4. CEA-Saclay, Service de Physique Nucleaire, 91191 Gif-sur-Yvette (France)
5. INFN, Laboratori Nazionali di Frascati, 00044 Frascati (Italy)
6. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
7. The George Washington University, Washington, D.C. 20052 (United States)

We report a measurement of the differential cross section for the gamman->pi{sup -}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 (theta{sub c.m.}) between 50 deg. and 115 deg. We confirm a previous indication of a broad enhancement around a c.m. energy (sq root(s)) of 2.1 GeV at theta{sub c.m.}=90 deg. in the scaled differential cross section s{sup 7}(dsigma/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 theta{sub c.m.} from 70 deg. to 105 deg.

• OSTI ID: 21347017
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 103; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BOSONS
CEBAF ACCELERATOR
CENTER-OF-MASS SYSTEM
CROSS SECTIONS
DEUTERIUM
DIFFERENTIAL CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
HADRONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LINEAR ACCELERATORS
MASSLESS PARTICLES
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEI
ODD-ODD NUCLEI
PHOTONS
PIONS
PSEUDOSCALAR MESONS
STABLE ISOTOPES