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


Aad G., Abbott B., Abdallah J., Abdelalim A., Abdesselam A., Abdinov O., ...Daha Fazla

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.705, sa.1-2, ss.9-27, 2011 (SCI-Expanded) identifier identifier

Özet

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. © 2011 CERN.