Measurement of the ϒ(1S) production cross-section in pp collisions at √s = 7 TeV in ATLAS
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Aad-2011-Measurement of the p.pdf
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1.21 MB
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450082e10b03c621b912f7ac8102e189
Author(s)
Taylor, Frank E.
Date Issued
October 2011
Journal
Physics Letters B
Publisher
Elsevier
Citation
Aad, G., B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. “Measurement of the ϒ(1S) Production Cross-Section in Pp Collisions at √s = 7 TeV in ATLAS.” Physics Letters B 705, no. 1–2 (November 2011): 9–27.
Version
Final published version
Abstract
A measurement of the cross-section for ϒ(1S)→μ[superscript +]μ[superscript −] production in proton–proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |yϒ(1S)|<1.2 and 1.2<|yϒ(1S)|<2.4. The measurement requires that both muons have transverse momentum p[subscript T superscript μ] > 4 GeV and pseudorapidity |ημ|<2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb[superscript −1], collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in Pythia while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2011.09.092
