title: Measurement of Differential ρ0 Photoproduction  Cross-Sections at HERA
creator: Bolz, Arthur Eugen
subject: ddc-530
subject: 530 Physics
description: Exclusive photoproduction of ρ 0 vector mesons is studied with the H1 detector  at HERA. A sample of over 900 000 π + π − photoproduction events was collected  in the years 2006-2007 using the H1 Fast Track Trigger. It corresponds to an  integrated luminosity of 1.3 pb −1 . The dataset is used to study single-, double-,  and triple-differential π + π − photoproduction cross-sections as a function of the  invariant mass of the pions m ππ , the photon-proton collision energy W γp , and the  squared momentum transfer at the proton vertex t. The phasespace is restricted  to 0.5 GeV < m ππ < 2.2 GeV, 20 GeV < W γp < 80 GeV, −t < 1.5 GeV 2 , and a  photon virtuality Q 2 < 0.1 GeV 2 . Reactions in which the scattered proton stays  intact are statistically separated from those where it dissociates to a low-mass  hadronic system in the range m p < m Y < 10 GeV.  The m ππ distributions are parametrized by a Söding model to extract the ρ 0  contribution to π + π − production. Single- and double-differential ρ 0 cross-sections  are measured as a function of W γp and t. The observed kinematic cross-section  dependencies are parametrized using őts and are compared to expectations from  phenomenological models as well as results from previous measurements. From the  double-differential ρ 0 cross-section, the effective intercept and slope of the leading  Regge trajectory in the measurement phasespace are extracted:    α(t = 0) = 1.0659 ± 0.0033 (stat.) +0.0099/−0.0059 (syst.)  α (t = 0) = 0.243 ± 0.050 (stat.) +0.030/−0.042 (syst.) GeV −2 .
date: 2019
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/27450/1/phdThesis-PDFA.pdf
identifier: DOI:10.11588/heidok.00027450
identifier: urn:nbn:de:bsz:16-heidok-274504
identifier:   Bolz, Arthur Eugen  (2019) Measurement of Differential ρ0 Photoproduction Cross-Sections at HERA.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/27450/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng