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Observation of an excited Bc± meson state with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 21Article in journal (Refereed) Published
Abstract [en]

A search for excited states of the Bc± meson is performed using 4.9fb-1 of 7 TeV and 19.2fb-1 of 8 TeV pp collision data collected by the ATLAS experiment at the LHC. A new state is observed through its hadronic transition to the ground state, with the latter detected in the decay Bc±→J/ψπ±. The state appears in the m(Bc±π+π-)-m(Bc±)-2m(π±) mass difference distribution with a significance of 5.2 standard deviations. The mass of the observed state is 6842±4±5MeV, where the first error is statistical and the second is systematic. The mass and decay of this state are consistent with expectations for the second S-wave state of the Bc± meson, Bc±(2S).

Place, publisher, year, edition, pages
2014. Vol. 113, no 21
Keyword [en]
Bosons; Ground state; Hadrons; Shear waves; Tellurium compounds, ATLAS detectors; ATLAS experiment; Mass difference; Standard deviation; Wave state, Excited states
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-158868DOI: 10.1103/PhysRevLett.113.212004ISI: 000345745800002ScopusID: 2-s2.0-84915745663OAI: diva2:779118
Swedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20150112

Available from: 2015-01-12 Created: 2015-01-12 Last updated: 2015-01-12Bibliographically approved

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Jovicevic, JelenaKuwertz, EmmaMorley, Anthony K.Strandberg, Jonas
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