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Observation of a New chi(b) State in Radiative Transitions to Y(1S) and Y(2S) at ATLAS
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
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2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 15, 152001- p.Article in journal (Refereed) Published
Abstract [en]

The chi(b)(np) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at root s=7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb(-1), these states are reconstructed through their radiative decays to Y(1S,2S) with Y ->mu(+)mu(-). In addition to the mass peaks corresponding to the decay modes chi(b)(1P,2P)-> Y(1S)gamma, a new structure centered at a mass of 10.530 +/- 0.005(stat)+/- 0.009(syst) GeV is also observed, in both the Y(1S)gamma and Y(2S)gamma decay modes. This structure is interpreted as the chi(b)(3P) system.

Place, publisher, year, edition, pages
2012. Vol. 108, no 15, 152001- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-76084DOI: 10.1103/PhysRevLett.108.152001ISI: 000302635600005OAI: oai:DiVA.org:su-76084DiVA: diva2:525464
Note
3039Available from: 2012-05-08 Created: 2012-05-08 Last updated: 2017-12-07Bibliographically approved

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Åsman, BarbroBohm, ChristianEriksson, DanielGellerstedt, KarlHellman, StenHolmgren, Sven-OlofJon-And, KerstinKim, Hyeon JinKlimek, PawelMilstead, DavidMoa, TorbjörnNordkvist, BjörnOhm, ChristianPapadelis, ArasSellden, BjörnSilverstein, SamuelSjölin, JörgenStrandberg, SaraTylmad, MajaYang, Zhaoyu
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