Extracting the photoproduction cross sections off the neutron, via the {gamma}n{yields}{pi}{sup -}p reaction, from deuteron data with final-state interaction effects

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.035203· OSTI ID:21596784

Tarasov, V E ^[1]; Briscoe, W J; Strakovsky, I I ^[2]; Gao, H ^[3]; Kudryavtsev, A E ^[1]

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1. Institute of Theoretical and Experimental Physics, Moscow, 117259 (Russian Federation)
2. Center for Nuclear Studies, Department of Physics, George Washington University, Washington, DC 20052 (United States)
3. Duke University, Durham, North Carolina 27708 (United States)

The incoherent pion photoproduction reaction {gamma}d {yields} {pi}{sup -}pp is considered theoretically in a wide energy region E{sub th}{<=}E{sub {gamma}}{<=}2700 MeV. The model applied contains the impulse approximation as well as the NN and {pi}N final-state-interaction (FSI) amplitudes. The aim of the paper is to study a reliable way for getting the information on elementary {gamma}n {yields} {pi}{sup -}p reaction cross sections beyond the impulse approximation for {gamma}d {yields} {pi}{sup -}pp. For the elementary {gamma}N {yields} {pi}N, N N {yields} N N, and {pi}N {yields} {pi}N amplitudes, the results of The George Washington University (GW) Data Analysis Center (DAC) are used. There are no additional theoretical constraints. The calculated cross sections d{sigma} /d{Omega}({gamma}d {yields} {pi}{sup -}pp) are compared with existing data. The procedure used to extract information on the differential cross section d{sigma} /d{Omega}({gamma}n {yields} {pi}{sup -}p) on the neutron from the deuteron data using the FSI correction factor R is discussed. The calculations for R versus {pi}{sup -}p center-of-mass (CM) angle {theta}{sub 1} of the outgoing pion are performed at different photon-beam energies with kinematic cuts for a ''quasifree'' process {gamma}n {yields} {pi}{sup -}p. The results show a sizable FSI effect R{ne}1 from the S-wave part of pp-FSI at small angles close to {theta}{sub 1}{approx}0: this region narrows as the photon energy increases. At larger angles, the effect is small (|R - 1|<<1) and agrees with estimations of FSI in the Glauber approach.

• OSTI ID: 21596784
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
APPROXIMATIONS
BARYONS
BASIC INTERACTIONS
BEAMS
BOSONS
CALCULATION METHODS
CENTER-OF-MASS SYSTEM
CHARGED PARTICLES
CORRECTIONS
CROSS SECTIONS
DATA ANALYSIS
DEUTERONS
DIFFERENTIAL CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FINAL-STATE INTERACTIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
IMPULSE APPROXIMATION
INTERACTIONS
MASSLESS PARTICLES
MESONS
NEUTRONS
NUCLEONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON BEAMS
PHOTONS
PHOTOPRODUCTION
PIONS
PSEUDOSCALAR MESONS
S WAVES