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Preprint/Report PUBDB-2015-03478
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Exclusive $\rho^{0}$ Meson Photoproduction with a Leading Neutron at HERA

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Report No.: DESY-15-120; arxiv:1508.03176

Abstract: 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 √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 < $W_{γp}$ < 100 GeV and the polar angle of the leading neutron $θ_{n}$ < 0.75 mrad. The cross section of the reaction $\gamma p → \rho^{0}n\pi^{+}$ is measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the pro-ton 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, $\sigma^{el}(\gamma \pi^{+} → \rho^{0}\pi^{+}$), is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $\gamma p → \rho^{0}n\pi^{+}$.

Classification:
Contributing Institute(s):
  1. H1 Kollaboration (H1)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)
Experiment(s):
  1. HERA: H1

Appears in the scientific report 2015
Database coverage:
OpenAccess ; Published
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Private Collections > >DESY > >FH > >H1 > H1
Document types > Reports > Preprints
Document types > Reports > Reports
Public records
Publications database
OpenAccess
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Report/Journal Article  ;  ;  ; et al
Exclusive $\rho^0$ Meson Photoproduction with a Leading Neutron at HERA
The European physical journal / C 76, 41 () [10.1140/epjc/s10052-015-3863-1]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

 Record created 2015-09-07, last modified 2021-11-10
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