Photoproduction of $D^{*\pm}$ mesons associated with a leading neutron

Details Photoproduction of $D^{*\pm}$ mesons associated with a leading neutron Photoproduction of $D^{*\pm}$ mesons associated with a leading neutron

2004-01-14

arxiv.org/abs/hep-ex/0401017v1

Phys.Lett.B590:143-160,2004

Physics

High Energy Physics

High Energy Physics - Experiment

28 pages, 4 figures, 2 tables

Scientific paper

10.1016/j.physletb.2004.03.076

The photoproduction of $D^{*\pm} (2010)$ 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, {$x_L>0.2$}, 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 {$p_{\it T} > 1.9$ 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 $8.85\pm 0.93({\rm stat.})^{+0.48}_{-0.61}({\rm syst.})\%$ in the photon-proton center-of-mass energy range {$130

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