Diffractive photoproduction of D*(+/-)(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb(-1). The D* mesons were reconstructed in the kinematic range: transverse momentum p(T)(D*) > 1.9 GeV and pseudorapidity |eta( D*)| < 1.6, using the decay D*(+) -> D(0)pi(+)(s) followed by D(0) -> K(-) pi(+)(+c.c.). Diffractive events were identi. ed by a large gap in pseudorapidity between the produced hadronic state and the outgoing proton. Cross sections are reported for photon-proton centre-of-mass energies in the range 130 < W < 300 GeV and for photon virtualities Q(2) < 1 GeV(2), in two ranges of the Pomeron fractional momentum x(IP) < 0.035 and x(IP) < 0.01. The relative contribution of di. ractive events to the inclusive D*(+/-) (2010) photoproduction cross section is about 6%. The data are in agreement with perturbative QCD calculations based on various parameterisations of di. ractive parton distribution functions. The results are consistent with di. ractive QCD factorisation.

Diffractive photoproduction of D*(+/-) (2010) at HERA

BRUGNERA, RICCARDO;CARLIN, ROBERTO;GARFAGNINI, ALBERTO;A. Longhin;
2007

Abstract

Diffractive photoproduction of D*(+/-)(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb(-1). The D* mesons were reconstructed in the kinematic range: transverse momentum p(T)(D*) > 1.9 GeV and pseudorapidity |eta( D*)| < 1.6, using the decay D*(+) -> D(0)pi(+)(s) followed by D(0) -> K(-) pi(+)(+c.c.). Diffractive events were identi. ed by a large gap in pseudorapidity between the produced hadronic state and the outgoing proton. Cross sections are reported for photon-proton centre-of-mass energies in the range 130 < W < 300 GeV and for photon virtualities Q(2) < 1 GeV(2), in two ranges of the Pomeron fractional momentum x(IP) < 0.035 and x(IP) < 0.01. The relative contribution of di. ractive events to the inclusive D*(+/-) (2010) photoproduction cross section is about 6%. The data are in agreement with perturbative QCD calculations based on various parameterisations of di. ractive parton distribution functions. The results are consistent with di. ractive QCD factorisation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2499967
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