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The exclusive photoproduction reaction gamma p -> gamma(1S)p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468 pb(-1). The measurement covers the kinematic range 60 < W < 220 GeV and Q(2) < 1 GeV2, where W is the photon-proton centre-of-mass energy and Q(2) is the photon virtuality. The exponential slope, b, of the t dependence of the cross section, where t is the squared four-momentum transfer at the proton vertex, has been measured, yielding b = 4.3(-1.3)(+2.0)(stat.)(-0.6)(+0.5) (syst.) GeV-2. This constitutes the first measurement of the t dependence of the gamma p -> gamma(1S)p cross section. (C) 2012 Elsevier B.V. All rights reserved.

Measurement of the t dependence in exclusive photoproduction of gamma(1s) mesons at HERA / H., A., I., A., L., A., M., A., R., A., S., A., P., A., A., A., M., A., V., A., Y., A., O., B., A., B., A. N., B., G., B., G., B., F., B., N., B., D., B., M., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 708:(2012), pp. 14-20. [10.1016/j.physletb.2012.01.009]

Measurement of the t dependence in exclusive photoproduction of gamma(1s) mesons at HERA

D'AGOSTINI, Giulio;NIGRO, Andrea;
2012

Abstract

The exclusive photoproduction reaction gamma p -> gamma(1S)p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468 pb(-1). The measurement covers the kinematic range 60 < W < 220 GeV and Q(2) < 1 GeV2, where W is the photon-proton centre-of-mass energy and Q(2) is the photon virtuality. The exponential slope, b, of the t dependence of the cross section, where t is the squared four-momentum transfer at the proton vertex, has been measured, yielding b = 4.3(-1.3)(+2.0)(stat.)(-0.6)(+0.5) (syst.) GeV-2. This constitutes the first measurement of the t dependence of the gamma p -> gamma(1S)p cross section. (C) 2012 Elsevier B.V. All rights reserved.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the t dependence in exclusive photoproduction of gamma(1s) mesons at HERA / H., A., I., A., L., A., M., A., R., A., S., A., P., A., A., A., M., A., V., A., Y., A., O., B., A., B., A. N., B., G., B., G., B., F., B., N., B., D., B., M., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 708:(2012), pp. 14-20. [10.1016/j.physletb.2012.01.009]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/495920
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