Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 21, 212004- p.Article in journal (Refereed) Published
A search for excited states of the B-c(+/-) meson is performed using 4.9 fb(-1) of 7 TeV and 19.2 fb(-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 decayB(c)(+/-) -> J/psi pi(+/-). The state appears in the m(B-c(+/-)pi(+)pi(-)) - m(B-c(+/-)) - 2m(pi(+/-)) mass difference distribution with a significance of 5.2 standard deviations. The mass of the observed state is 6842 +/- 4 +/- 5 MeV, 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 B-c(+/-) meson, B-c(+/-)(2S).
Place, publisher, year, edition, pages
2014. Vol. 113, no 21, 212004- p.
IdentifiersURN: urn:nbn:se:uu:diva-241567DOI: 10.1103/PhysRevLett.113.212004ISI: 000345745800002OAI: oai:DiVA.org:uu-241567DiVA: diva2:779866
ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevLett.113.2120042015-01-132015-01-132015-01-13Bibliographically approved