Scientific article
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Measurement of the ϒ(1S) production cross-section in pp collisions at √s=7 TeV in ATLAS

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 705, no. 1-2, p. 9-27
Publication date2011

A measurement of the cross-section for ϒ(1S)→μ+μ− 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 pTμ>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−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.

Citation (ISO format)
ATLAS Collaboration. Measurement of the ϒ(1S) production cross-section in <em>pp</em> collisions at √s=7 TeV in ATLAS. In: Physics letters. B, 2011, vol. 705, n° 1-2, p. 9–27. doi: 10.1016/j.physletb.2011.09.092
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Article (Published version)
ISSN of the journal0370-2693

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