Measurement of the upsilon(nS) cross sections in PP collisions at sqrt(s) = 7 TeV
Abstract
The ϒ(nS) production cross sections are measured using a data sample corresponding to an integrated luminosity of 35.8±1.4 pb−1 of proton-proton collisions at [special characters omitted] = 7 TeV, collected with the CMS detector at the CERN LHC. Integrated over the transverse momentum range pT < 50 GeV/c and rapidity range :y: < 2.4, and assuming unpolarized ϒ(nS) production, the products of the ϒ(nS) production cross sections and branching fractions are [special characters omitted] where the first uncertainty is statistical, the second is systematic, and the third is associated with the estimation of the integrated luminosity of the data sample. The ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in transverse momentum and rapidity and the cross section ratios ϒ(nS)/ϒ(mS) are presented. Cross section measurements performed within a restricted muon kinematic range and not corrected for the acceptance are also provided. These measurements are independent of ϒ(nS) polarization assumptions.
Degree
Ph.D.
Advisors
Shipsey, Purdue University.
Subject Area
Particle physics
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