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          Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716353.0, MPI für Physik / YB 2016
Exclusive $\\rho^0$ Meson Photoproduction with a Leading Neutron at HERA
Authors:H1 Collaboration
Date of Publication (YYYY-MM-DD):2016
Title of Journal:European Physical Journal C
Journal Abbrev.:Eur.Phys.J.C
Issue / Number:76
Start Page:1
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:A first measurement is presented of exclusive photoproduction of $\\rho^0$ mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years $2006$ and $2007$ at a centre-of-mass energy of $\\sqrt{s}=319$ GeV and correspond to an integrated luminosity of $1.16$ pb$^{-1}$. The $\\rho^0$ mesons with transverse momenta $p_T<1$ GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, $x_L>0.35$, are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality $Q^2 < 2$ GeV$^2$, the total energy of the photon-proton system $20 < W_{\\gamma p} < 100$ GeV and the polar angle of the leading neutron $\\theta_n < 0.75$ mrad. The cross section of the reaction $\\gamma p \\to \\rho^0 n \\pi^+$ is measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a $\\rho^0$ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, $\\sigma^{\\rm el}(\\gamma\\pi^+ \\to \\rho^0\\pi^+)$, is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $\\gamma p\\to\\rho^0 n \\pi^+$.
Classification / Thesaurus:H1
Comment of the Author/Creator:38 pages, 13 figures, 10 tables, submitted tp EPJC
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
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