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Energetic 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, vertical bar t vertical bar < 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) proportional to (1 - x(L))(a(t)), with the powers a(t) following a linear function of t: a(t) = 0.88 +/- 0.09(stat.)(-0.39)(+0.34) (syst.) - (2.81 +/- 0.42(stat.)(-0.62)(+1.13) (syst.) GeV(-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. (c) 2005 Elsevier B.V. All rights reserved.

Study of the pion trajectory in the photoproduction of leading neutrons at HERA / S., C., M., D., D., K., J. H., L., S., M., S., M., B., M., J., R., R., Y., M. C. K., M., P., A., G., B., M., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 610:3-4(2005), pp. 199-211. [10.1016/j.physletb.2005.01.101]

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

D'AGOSTINI, Giulio;NIGRO, Andrea;
2005

Abstract

Energetic 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, vertical bar t vertical bar < 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) proportional to (1 - x(L))(a(t)), with the powers a(t) following a linear function of t: a(t) = 0.88 +/- 0.09(stat.)(-0.39)(+0.34) (syst.) - (2.81 +/- 0.42(stat.)(-0.62)(+1.13) (syst.) GeV(-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. (c) 2005 Elsevier B.V. All rights reserved.
2005
01 Pubblicazione su rivista::01a Articolo in rivista
Study of the pion trajectory in the photoproduction of leading neutrons at HERA / S., C., M., D., D., K., J. H., L., S., M., S., M., B., M., J., R., R., Y., M. C. K., M., P., A., G., B., M., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 610:3-4(2005), pp. 199-211. [10.1016/j.physletb.2005.01.101]
01a Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/360091
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