Photoproduction of D*+- mesons associated with a leading neutronстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The photoproduction of D∗±(2010) mesons associated with a leading neutron has been observed with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 80 pb−1. The neutron carries a large fraction, {xL>0.2}, of the incoming proton beam energy and is detected at very small production angles, {\theta_n<0.8 mrad}, an indication of peripheral scattering. The D∗ meson is centrally produced with pseudorapidity {|\eta|<1.5}, and has a transverse momentum {pT>1.9 GeV}, which is large compared to the average transverse momentum of the neutron of 0.22 GeV. The ratio of neutron-tagged to inclusive D∗ production is 8.85±0.93(stat.)+0.48−0.61(syst.)% in the photon-proton center-of-mass energy range {130 <W<280 GeV}. The data suggest that the presence of a hard scale enhances the fraction of events with a leading neutron in the final state.