Measurement of the production cross section ratio sigma(chi b2(1P))/sigma(chi b1(1P)) in pp collisions at root s=8TeVopen access
- Authors
- Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Ero, J; Fabjan, C; Friedl, M; Kim, Tae Jeong
- Issue Date
- Mar-2015
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- CMS; Quarkonium production; P-wave states; Bottomonium
- Citation
- PHYSICS LETTERS B, v.743, pp.383 - 402
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICS LETTERS B
- Volume
- 743
- Start Page
- 383
- End Page
- 402
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143224
- DOI
- 10.1016/j.physletb.2015.02.048
- ISSN
- 0370-2693
- Abstract
- A measurement of the production cross section ratio sigma(chi b2(1P))/sigma(chi b1(1P)) is presented. The chi b1 (1P) and chi b2 (1P) bottomonium states, promptly produced in pp collisions at root s = 8TeV, are detected by the CMS experiment at the CERN LHC through their radiative decays chi b1,2(1P) -˃ Y(1S) + gamma. The emitted photons are measured through their conversion to e(+) e(-) pairs, whose reconstruction allows the two states to be resolved. The Y(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, vertical bar eta(gamma)vertical bar ˂ 1.0; the Y(1S) rapidity, vertical bar y(Y)vertical bar ˂ 1.5; and the Y(1S) transverse momentum, 7 ˂ p(T)(Y) ˂ 40 GeV. The cross section ratio shows no significant dependence on the.(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 chi b branching fractions.
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