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Production of heavy flavours with associated jets at HERA

Abstract

Inclusive cross-sections for the production of open beauty and charm in ep collisions at HERA recorded with the ZEUS detector in the years 1996-2000 are measured. The data is restricted to photoproduction processes, i. e. collision events with small four-momentum transfers squared, Q{sup 2} {approx}0. Two associated jets with transverse energies E{sub t}>7(6)GeV and pseudo-rapidities vertical stroke {eta} vertical stroke <2.5 are required. The flavour is tagged by the identification of electrons and positrons from semi-leptonic decays of the heavy quark. For this a likelihood method is developed, mainly consisting of energy loss measurements in the central drift chamber of the detector and some other discriminant variables. The fractions of beauty and charm production are determined by a fit of Monte Carlo templates to the data. The total measured production cross-section for b anti b production is 820{+-}150{sup +20}{sub -30} pb for centre-of-mass energies {radical}(S{sub ep})=300 GeV and 1170{+-}130{sup +30}{sub -100} pb for {radical}(S{sub ep})=318 GeV. The total cross-section for charm production is given as well as differential cross-sections for b anti b and c anti c production. (orig.)
Authors:
Publication Date:
Dec 15, 2006
Product Type:
Thesis/Dissertation
Report Number:
BONN-IR-2007-04
Resource Relation:
Other Information: TH: Diss.
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PHOTOPRODUCTION; TRANSVERSE ENERGY; ELECTRONS; POSITRONS; B QUARKS; DIFFERENTIAL CROSS SECTIONS; MULTIPLE PRODUCTION; JET MODEL; SEMI-INCLUSIVE INTERACTIONS; PHOTON-PROTON INTERACTIONS; PAIR PRODUCTION; PARTICLE RAPIDITY; INTEGRAL CROSS SECTIONS; GEV RANGE 100-1000; EXPERIMENTAL DATA; C QUARKS; ELECTRON-PROTON INTERACTIONS; ANTILEPTON-PROTON INTERACTIONS; ELECTROPRODUCTION
OSTI ID:
20903019
Research Organizations:
Bonn Univ. (Germany). Physikalisches Inst.; Bonn Univ. (Germany). Mathematisch-Naturwissenschaftliche Fakultaet
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISSN 0172-8741; TRN: DE07F8905
Availability:
INIS
Submitting Site:
DEN
Size:
219 pages
Announcement Date:
Sep 06, 2007

Citation Formats

Kind, O M. Production of heavy flavours with associated jets at HERA. Germany: N. p., 2006. Web.
Kind, O M. Production of heavy flavours with associated jets at HERA. Germany.
Kind, O M. 2006. "Production of heavy flavours with associated jets at HERA." Germany.
@misc{etde_20903019,
title = {Production of heavy flavours with associated jets at HERA}
author = {Kind, O M}
abstractNote = {Inclusive cross-sections for the production of open beauty and charm in ep collisions at HERA recorded with the ZEUS detector in the years 1996-2000 are measured. The data is restricted to photoproduction processes, i. e. collision events with small four-momentum transfers squared, Q{sup 2} {approx}0. Two associated jets with transverse energies E{sub t}>7(6)GeV and pseudo-rapidities vertical stroke {eta} vertical stroke <2.5 are required. The flavour is tagged by the identification of electrons and positrons from semi-leptonic decays of the heavy quark. For this a likelihood method is developed, mainly consisting of energy loss measurements in the central drift chamber of the detector and some other discriminant variables. The fractions of beauty and charm production are determined by a fit of Monte Carlo templates to the data. The total measured production cross-section for b anti b production is 820{+-}150{sup +20}{sub -30} pb for centre-of-mass energies {radical}(S{sub ep})=300 GeV and 1170{+-}130{sup +30}{sub -100} pb for {radical}(S{sub ep})=318 GeV. The total cross-section for charm production is given as well as differential cross-sections for b anti b and c anti c production. (orig.)}
place = {Germany}
year = {2006}
month = {Dec}
}