Observation of the χb1(3P) and χb2(3P) and measurement of their masses

CMS Collaboration

Observation of the χ_b1(3P) and χ_b2(3P) and measurement of their masses

CMS Collaboration

Department of Physics

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

Abstract

The χ_b1(3P) and χ_b2(3P) states are observed through their Υ(3S) γ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb⁻¹. The Υ(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e⁺e⁻ pairs in the silicon tracker, leading to a χ_b(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10 513.42 ± 0.41 (stat) ± 0.18 (syst) MeV and 10 524.02 ± 0.57 (stat) ± 0.18 (syst) MeV; they are determined with respect to the world-average value of the Υ(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 ± 0.64 (stat) ± 0.17 (syst) MeV.

Original language	English
Journal	Unknown Journal
Publication status	Published - 2018 May 28

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@article{db7ada64b0354b85bb637d72bdc272fc,

title = "Observation of the χb1(3P) and χb2(3P) and measurement of their masses",

abstract = "The χb1(3P) and χb2(3P) states are observed through their Υ(3S) γ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb−1. The Υ(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e− pairs in the silicon tracker, leading to a χb(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10 513.42 ± 0.41 (stat) ± 0.18 (syst) MeV and 10 524.02 ± 0.57 (stat) ± 0.18 (syst) MeV; they are determined with respect to the world-average value of the Υ(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 ± 0.64 (stat) ± 0.17 (syst) MeV.",

author = "{CMS Collaboration} and Sirunyan, {A. M.} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and {Escalante Del Valle}, A. and M. Flechl and R. Fr{\"u}hwirth and Ghete, {V. M.} and J. Hrubec and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and A. Taurok and W. Waltenberger and J. Wittmann and Wulz, {C. E.} and M. Zarucki and V. Chekhovsky and V. Mossolov and {Suarez Gonzalez}, J. and {De Wolf}, {E. A.} and {Di Croce}, D. and X. Janssen and J. Lauwers and M. Pieters and {Van De Klundert}, M. and {Van Haevermaet}, H. and {Van Mechelen}, P. and {Van Remortel}, N. and {Abu Zeid}, S. and F. Blekman and J. D'Hondt and {De Bruyn}, I. and B. Hong and J. Yoo",

year = "2018",

month = may,

day = "28",

language = "English",

journal = "Zeitschrift für Induktive Abstammungs- und Vererbungslehre",

issn = "0730-6512",

publisher = "Kluwer Academic Publishers",

}

TY - JOUR

T1 - Observation of the χb1(3P) and χb2(3P) and measurement of their masses

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Taurok, A.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Pieters, M.

AU - Van De Klundert, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Abu Zeid, S.

AU - Blekman, F.

AU - D'Hondt, J.

AU - De Bruyn, I.

AU - Hong, B.

AU - Yoo, J.

PY - 2018/5/28

Y1 - 2018/5/28

N2 - The χb1(3P) and χb2(3P) states are observed through their Υ(3S) γ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb−1. The Υ(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e− pairs in the silicon tracker, leading to a χb(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10 513.42 ± 0.41 (stat) ± 0.18 (syst) MeV and 10 524.02 ± 0.57 (stat) ± 0.18 (syst) MeV; they are determined with respect to the world-average value of the Υ(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 ± 0.64 (stat) ± 0.17 (syst) MeV.

AB - The χb1(3P) and χb2(3P) states are observed through their Υ(3S) γ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb−1. The Υ(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e− pairs in the silicon tracker, leading to a χb(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10 513.42 ± 0.41 (stat) ± 0.18 (syst) MeV and 10 524.02 ± 0.57 (stat) ± 0.18 (syst) MeV; they are determined with respect to the world-average value of the Υ(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 ± 0.64 (stat) ± 0.17 (syst) MeV.

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UR - http://www.scopus.com/inward/citedby.url?scp=85094454029&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85094454029

JO - Zeitschrift für Induktive Abstammungs- und Vererbungslehre

JF - Zeitschrift für Induktive Abstammungs- und Vererbungslehre

SN - 0730-6512

ER -