Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.044603· OSTI ID:20696075

Zhu, L Y; Clasie, B; Crawford, C; Dutta, D; Higinbotham, D W; Seely, J; Sirca, S; Williamson, C; Xiang, H; Xiong, F; Xu, W; Zheng, X ^[1]; Arrington, J; Dohrmann, F; Hafidi, K; Holt, R J; Potterveld, D; Reimer, P E; Wijesooriya, K ^[2]; Averett, T ^[3]

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1. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. College of William and Mary, Williamsburg, Virginia 23185 (United States)

The differential cross sections for the {gamma}n{yields}{pi}{sup -}p and the {gamma}p{yields}{pi}{sup +}n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50 deg. to 110 deg. The {pi}{sup -} and {pi}{sup +} photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing {pi}{sup +} data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [d{sigma}/dt({gamma}n{yields}{pi}{sup -}p)/d{sigma}/dt({gamma}p{yields}{pi}{sup +}n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.

• OSTI ID: 20696075
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CEBAF ACCELERATOR
DEUTERIUM TARGET
DIFFERENTIAL CROSS SECTIONS
FEYNMAN DIAGRAM
GEV RANGE
GLUONS
HYDROGEN 1 TARGET
PHOTON-NEUTRON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
PIONS MINUS
PIONS PLUS
TRANSVERSE MOMENTUM