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Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P))in pp collisions at √s=8TeV
Baringer, Philip S. Bean, Alice Murray, Michael J. Sanders, Stephen J.
Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
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Abstract
A measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P))is presented. The χb1(1P)and χb2(1P)bottomonium states, promptly produced in pp collisions at √s=8TeV, are detected by the CMS experiment at the CERN LHC through their radiative decays χb1,2(1P) →ϒ(1S) +γ. The emitted photons are measured through their conversion to e+e−pairs, whose reconstruction allows the two states to be resolved. The ϒ(1S)is measured through its decay to two muons. An event sample corresponding to an integrated luminosity of 20.7fb−1is used to measure the cross section ratio in a phase-space region defined by the photon pseudorapidity, |ηγ| <1.0; the ϒ(1S)rapidity, |yϒ| <1.5; and the ϒ(1S)transverse momentum, 7 <pϒT<40GeV. The cross section ratio shows no significant dependence on the ϒ(1S)transverse momentum, with a measured average value of 0.85 ±0.07 (stat+syst) ±0.08 (BF), where the first uncertainty is the combination of the experimental statistical and systematic uncertainties and the second is from the uncertainty in the ratio of the χbbranching fractions.
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2015-02-24
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Elsevier
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MMurray_2015.pdf
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CMS, Quarkonium production, P-wave states, Bottomonium
Citation
Hewamanage, S., Linn, S., Markowitz, P. E., Martinez, G., Rodriguez, J. L., & CMS Collaboration. (2015). Measurement of the production cross section ratio σ (χb2 (1P))/σ (χb1 (1P)) in pp collisions at√ s= 8TeV.