eprintid: 1878
rev_number: 8
eprint_status: archive
userid: 1
dir: disk0/00/00/18/78
datestamp: 2002-02-01 00:00:00
lastmod: 2014-04-03 11:32:10
status_changed: 2012-08-14 15:03:08
type: doctoralThesis
metadata_visibility: show
creators_name: Berndt, Thomas
title: Exclusive Pomeron- and Odderon induced photoproduction of omega- and f2 mesons at HERA
title_de: Exklusive Pomeron- und Odderon induzierte omega- und f2 Photoproduktion bei HERA
ispublished: pub
subjects: 530
divisions: 130700
adv_faculty: af-13
keywords: OdderonH1 <particle detector> , photoproduction , Pomeron , Odderon
cterms_swd: H1 <Teilchendetektor>
cterms_swd: Photoproduktion
cterms_swd: Pomeron
abstract_translated_text: The topics of this thesis are the analyses of exclusive photoproduction of $omega$- and $f_{2}$-mesons at mean $gp$ centre of mass energies of $langle Wangleapprox 200$ GeV at HERA.      The former process is thought to be induced by photon-Pomeron interactions, and its cross section is measured to be $sigma(gpoomega p)=(1.3 pm 0.2(ext{stat}) pm 0.2(ext{syst})),muext{b}$, where the decay $omegaopigao3gamma$ is used to analyse the events. The diffractive slope $b$ describing the exponential fall of $ds/d|t|proptoexp(-b|t|)$ is measured by analysing the acceptance corrected differential distribution $d N/d|t|$. The value found for this parameter amounts to $b=(10.7pm 1.1(ext{stat})pm 2.0(ext{syst})),ext{GeV}^{-2}$. The corrected differential cross section $ds/d|t|$ is also found to be in accordance with the prediction of the Stochastic Vacuum Model for $ ho^{0}$-photoproduction scaled by a factor of $2/9$. The decay angular distributions $d N/dcosvartheta^{*}$ and $d N/dvarphi^{*}$ are found to be compatible with $s$-channel helicity conservation.      The predictions of the Stochastic Vacuum Model for Odderon induced $f_{2}$-photoproduction of $21$ nb cannot be confirmed, but a $95$  confidence level upper limit on the cross section of $sigma(gpo f_{2}X)<12.4,ext{nb}$ is given. The contributions of the $f_{2}$ are looked for in the $pipi$ mass spectrum, where the $f_{2}$ is thought to contribute via its decay $f_{2}opipio4gamma$.
abstract_translated_lang: eng
class_scheme: pacs
class_labels: 13.60.Fz 1
date: 2001
date_type: published
id_scheme: DOI
id_number: 10.11588/heidok.00001878
ppn_swb: 1643262610
own_urn: urn:nbn:de:bsz:16-opus-18785
date_accepted: 2001-12-05
advisor: HASH(0x556120e2f440)
language: eng
bibsort: BERNDTTHOMEXCLUSIVEP2001
full_text_status: public
citation:   Berndt, Thomas  (2001) Exclusive Pomeron- and Odderon induced photoproduction of omega- and f2 mesons at HERA.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/1878/1/main.pdf