Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) in pp collisions at
Our 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) = 8 TeV , 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 20.7 fb-1 is 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, 7TΥ<40 GeV . Finally, 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 χb branching fractions.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1214412
- Alternate ID(s):
- OSTI ID: 1234848
- Report Number(s):
- FERMILAB-PUB-14-367-CMS; CERN-PH-EP-2014-217; CMS-BPH-13-005; S0370269315001392; PII: S0370269315001392
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 743 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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