Exclusive ρ.sup.0./sup. meson photoproduction with a leading neutron at HERA

0469047 - FZÚ 2017 RIV DE eng J - Journal Article
Andreev, V. - Baghdasaryan, A. - Begzsuren, K. - Cvach, Jaroslav - Hladký, Jan - Reimer, Petr … Total 141 authors
Exclusive ρ⁰ meson photoproduction with a leading neutron at HERA.
European Physical Journal C. Roč. 76, č. 1 (2016), 1-21, č. článku 41. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT LG14033
Institutional support: RVO:68378271
Keywords : deep-inelastic scattering * vector meson production * pion exchange model * elastic photoproduction
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 5.297, year: 2016

A first measurement is presented of exclusive photoproduction of ρ0 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 phase space of the measurement is defined by the photon virtuality Q2<2 GeV2, the total energy of the photon–proton system 20<Wγp<100 GeV and the polar angle of the leading neutron θn<0.75 mrad. The cross section of the reaction γp→ρ0nπ+ 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 ρ0 meson on the virtual pion. The cross section indicates significant absorptive corrections for the exclusive reaction γp→ρ0nπ+.

Permanent Link: http://hdl.handle.net/11104/0266943