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Title: Measurement of the production cross section ratio σ(χ b2(1P)) / σ(χ b1(1P)) in pp collisions at √(s) = 8 TeV

Abstract

Our measurement of the production cross section ratio σ(χ b2(1P))/σ(χ b1(1P)) is presented. The χ b1(1P) and χ b2(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 χ b1,2(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, |η γ|<1.0; the Υ(1S) rapidity, |y Υ|<1.5; and the Υ(1S) transverse momentum, 7T Υ<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 χ b branching fractions.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1214412
Alternate Identifier(s):
OSTI ID: 1234848
Report Number(s):
FERMILAB-PUB-14-367-CMS; CERN-PH-EP-2014-217; CMS-BPH-13-005
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1409.5761; TRN: US1601022
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 743; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; Quarkonium production; P-wave states; Bottomonium

Citation Formats

Khachatryan, Vardan. Measurement of the production cross section ratio σ(χb2(1P)) / σ(χb1(1P)) in pp collisions at √(s) = 8 TeV. United States: N. p., 2015. Web. doi:10.1016/j.physletb.2015.02.048.
Khachatryan, Vardan. Measurement of the production cross section ratio σ(χb2(1P)) / σ(χb1(1P)) in pp collisions at √(s) = 8 TeV. United States. doi:10.1016/j.physletb.2015.02.048.
Khachatryan, Vardan. Tue . "Measurement of the production cross section ratio σ(χb2(1P)) / σ(χb1(1P)) in pp collisions at √(s) = 8 TeV". United States. doi:10.1016/j.physletb.2015.02.048.
@article{osti_1214412,
title = {Measurement of the production cross section ratio σ(χb2(1P)) / σ(χb1(1P)) in pp collisions at √(s) = 8 TeV},
author = {Khachatryan, Vardan},
abstractNote = {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.},
doi = {10.1016/j.physletb.2015.02.048},
journal = {Physics Letters. Section B},
number = ,
volume = 743,
place = {United States},
year = {Tue Feb 24 00:00:00 EST 2015},
month = {Tue Feb 24 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2015.02.048

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Cited by: 4 works
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