Study of the pion trajectory in the photoproduction of leading neutrons at HERA

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dc.creatorZEUS Collaboration
dc.creatorChekanov, S.
dc.date2004-04-01
dc.date2004-12-27
dc.date.accessioned2026-07-07T11:08:50Z
dc.date.available2026-07-07T11:08:50Z
dc.descriptionEnergetic neutrons produced in $ep$ collisions at HERA have been studied with the ZEUS detector in the photoproduction regime at a mean photon-proton center-of-mass energy of 220 GeV. The neutrons carry a large fraction $0.64 < x_L <0.925$ of the incoming proton energy, and the four-momentum-transfer squared at the proton-neutron vertex is small, $|t|<0.425$ GeV$^2$. The $x_L$ distribution of the neutrons is measured in bins of $t$. The $(1-x_L)$ distributions in the $t$ bins studied satisfy a power law $dN/dx_L \propto (1-x_L)^{a(t)}$, with the powers $a(t)$ following a linear function of $t$: \mbox{$a(t)=0.88\pm 0.09 ({\rm stat.})^{+0.34}_{-0.39}({\rm syst.})-(2.81\pm 0.42({\rm stat.})^{+1.13}_{-0.62}({\rm syst.}) {\rm Ge V}^{-2})t$.} This result is consistent with the expectations of pion-exchange models, in which the incoming proton fluctuates to a neutron-pion state, and the electron interacts with the pion.
dc.description11 pages, 3 figures; revised analysis
dc.identifierhttps://arxiv.org/abs/hep-ex/0404002
dc.identifierhttp://arxiv.org/abs/hep-ex/0404002
dc.identifierPhys.Lett.B610:199-211,2005
dc.identifierdoi:10.1016/j.physletb.2005.01.101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190272
dc.subjectHigh Energy Physics - Experiment
dc.titleStudy of the pion trajectory in the photoproduction of leading neutrons at HERA
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