Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) in pp collisions at s=8TeV

The CMS Collaboration

doi:10.1016/j.physletb.2015.02.048

Measurement of the production cross section ratio σ(χ_b2(1P))/σ(χ_b1(1P)) in pp collisions at s=8TeV

The CMS Collaboration

Physics

Research output: Contribution to journal › Article › peer-review

27 Citations (SciVal)

Abstract

A 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=8TeV, 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 20.7fb^-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, 7<pTϒ<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 χ_b branching fractions.

Original language	English
Pages (from-to)	383-402
Number of pages	20
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	743
DOIs	https://doi.org/10.1016/j.physletb.2015.02.048
Publication status	Published - 2015

Keywords

Bottomonium
CMS
P-wave states
Quarkonium production

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2015.02.048

Cite this

@article{f069a1ed4a8542a093759a944de937cb,

title = "Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) in pp collisions at s=8TeV",

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-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, 7b branching fractions.",

keywords = "Bottomonium, CMS, P-wave states, Quarkonium production",

author = "{CMS Collaboration}, Collaboration and V. Khachatryan and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and J. Er{\"o} and C. Fabjan and M. Friedl and R. Fr{\"u}hwirth and Ghete, {V. M.} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and W. Kiesenhofer and V. Kn{\"u}nz and M. Krammer and I. Kr{\"a}tschmer and D. Liko and I. Mikulec and D. Rabady and B. Rahbaran and H. Rohringer and R. Sch{\"o}fbeck and J. Strauss and A. Taurok and W. Treberer-Treberspurg and W. Waltenberger and Wulz, {C. E.} and V. Mossolov and N. Shumeiko and {Suarez Gonzalez}, J. and S. Alderweireldt and M. Bansal and S. Bansal and T. Cornelis and {De Wolf}, {E. A.} and X. Janssen and A. Knutsson and S. Luyckx and S. Ochesanu and B. Roland and R. Rougny and {Van De Klundert}, M. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Remortel}, N. and {Van Spilbeeck}, A. and A. Radi",

note = "Publisher Copyright: {\textcopyright} 2015 CERN for the benefit of the CMS Collaboration.",

year = "2015",

doi = "10.1016/j.physletb.2015.02.048",

language = "English",

volume = "743",

pages = "383--402",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) in pp collisions at s=8TeV

AU - The CMS Collaboration

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Erö, J.

AU - Fabjan, C.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Kiesenhofer, W.

AU - Knünz, V.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Taurok, A.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Alderweireldt, S.

AU - Bansal, M.

AU - Bansal, S.

AU - Cornelis, T.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Knutsson, A.

AU - Luyckx, S.

AU - Ochesanu, S.

AU - Roland, B.

AU - Rougny, R.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Van Spilbeeck, A.

AU - Radi, A.

PY - 2015

Y1 - 2015

N2 - 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-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, 7b branching fractions.

AB - 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-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, 7b branching fractions.

KW - Bottomonium

KW - CMS

KW - P-wave states

KW - Quarkonium production

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U2 - 10.1016/j.physletb.2015.02.048

DO - 10.1016/j.physletb.2015.02.048

M3 - Article

AN - SCOPUS:84924995960

SN - 0370-2693

VL - 743

SP - 383

EP - 402

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -