Measurement of the $Υ$(1S) production cross-section in $pp$ collisions at $\\sqrts=$ 7 TeV in ATLAS
Journal
Physics Letters
Journal Volume
B705
Pages
9-27
Date Issued
2011
Author(s)
Aad, Georges et al. (The ATLAS Collaboration)
Abstract
A measurement of the cross-section for (1S) + -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 (1S) transverse momentum in two bins of rapidity, |y (1S) | 4 GeV and pseudorapidity | | < 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.
SDGs
Type
journal article