Diffraction dissociation in photoproduction

Journal Article · Sun Apr 20 04:00:00 EDT 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.53712· OSTI ID:21167572

Newman, P R ^[1]

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1. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)

Differential cross sections for the process {gamma}p{yields}XY are measured as a function of the invariant mass M{sub X} of the system produced at the photon vertex. Results are presented in two fixed ranges of the mass M{sub Y} of the system Y, the lower of which, M{sub Y}<1.6 GeV, is heavily dominated by the single photon dissociation process {gamma}p{yields}Xp. Both the centre of mass energy W and the M{sub X}{sup 2} dependence of H1 single dissociation data and those from a fixed target experiment may simultaneously be described in a triple-Regge model. Diffraction is found to dominate at low M{sub X}, though a sizable subleading contribution is present at larger masses. The pomeron intercept is found to be {alpha}{sub P}(0)=1.068{+-}0.016 (stat.){+-}0.022 (syst.){+-}0.041 (model), in good agreement with values obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process {gamma}p{yields}Xp with M{sub X}{sup 2}/W{sup 2}<0.05 is measured to be 22.2{+-}0.6 (stat.){+-}2.6 (syst.){+-}1.7 (model)% of the total {gamma}p cross section at <W>=187 GeV.

• OSTI ID: 21167572
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 407; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DIFFERENTIAL CROSS SECTIONS
DIFFRACTION MODELS
GEV RANGE
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PHOTON-PROTON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
POMERANCHUK PARTICLES
REGGE CALCULUS
REST MASS
TOTAL CROSS SECTIONS