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Observation of a New chi(b) State in Radiative Transitions to Y(1S) and Y(2S) at ATLAS
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 3039
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:kth:diva-94196DOI: 10.1103/PhysRevLett.108.152001ISI: 000302635600005Scopus ID: 2-s2.0-84859575430OAI: oai:DiVA.org:kth-94196DiVA: diva2:525808
Note
QC 20120509. Author count: 3039.Available from: 2012-05-09 Created: 2012-05-09 Last updated: 2017-12-07Bibliographically approved

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Jovicevic, JelenaKuwertz, Emma S.Lund-Jensen, Bengt
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