Dissertation/Thesis Abstract

Measurement of the ϒ (1S) Production Cross Section in Proton-Proton Collisions at Center of Mass Energy 7 TeV
by Scherzer, Maxwell Ian, Ph.D., University of California, Berkeley, 2011, 131; 3498884
Abstract (Summary)

A measurement of the cross section for ϒ(1S) production in proton-proton collisions at center of mass energy 7 TeV is presented. The measurement uses the ϒ(1S) → μ+μ decay mode and covers up to a transverse momentum of 26 GeV in two bins of rapidity; |yϒ(1 S)| < 1.2 and 1.2 < |y ϒ(1S)| < 2.4. The results are based on an integrated luminosity of 1.13 pb−1 , collected with the ATLAS detector at the Large Hadron Collider. Templates derived from data are used to model the continuum background. In order to eliminate theoretical uncertainties due to the unknown polarization, the measurement is restricted to the case where both muons have a transverse momentum of pμ T > 4 GeV and a pseudorapidity |ημ| < 2.5. The results are compared to two theoretical predictions: they agree to within a factor of two with the PYTHIA implementation of NRQCD while disagreeing by up to a factor of ten with the color singlet model at next-to-leading order.

Indexing (document details)
Advisor: Heinemann, Beate
Commitee: Derenzo, Stephen, Heinemann, Beate, Jacobsen, Robert
School: University of California, Berkeley
Department: Physics
School Location: United States -- California
Source: DAI-B 73/07(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: Particle physics
Keywords: Center of mass energy, Cross-section, Hadron, Proton-proton collisions, Quarkonium
Publication Number: 3498884
ISBN: 9781267227003
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