Measurement of Υ production in pp collisions at √s = 2.76 TeV

• Main Authors: Counts, Ian Thomas Hunt (Contributor), Ilten, Philip James (Contributor), Williams, Michael (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: Springer-Verlag, 2014-07-18T13:21:06Z.
• Subjects: Article
• Online Access: Get fulltext

The production of Υ(1S), Υ(2S) and Υ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb[superscript −1] collected in proton-proton collisions at a centre-of-mass energy of √s = 2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the Υ transverse momentum and rapidity, over the ranges p[subscript T] < 15 GeV/c and 2.0 < y < 4.5. The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be σ(pp → Υ(1S)X) × B(Υ(1S) → μ[superscript +]μ[superscript −]) = 1.111 ± 0.043 ± 0.044 nb, σ(pp → Υ(2S)X) × B(Υ(2S) → μ[superscript +]μ[superscript −]) = 0.264 ± 0.023 ± 0.011 nb, σ(pp → Υ(3S)X) × B(Υ(3S) → μ[superscript +]μ[superscript −]) = 0.159 ± 0.020 ± 0.007 nb, where the first uncertainty is statistical and the second systematic.
National Science Foundation (U.S.)