0440199 - FZÚ 2015 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abdallah, J. - Böhm, Jan - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2884 authors
Observation of an excited Bc+/- meson state with the ATLAS detector.
Physical Review Letters. Roč. 113, č. 21 (2014), "2120041"-"212004-5". ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT(CZ) LG13009
Institutional support: RVO:68378271
Keywords : error * statistical * p p * scattering * B/c+ * ATLAS * meson * mass difference * CERN LHC Coll * excited state * ground state * J/psi(3100) * pi+ pi-
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 7.512, year: 2014 ; AIS: 3.456, rok: 2014
DOI: https://doi.org/10.1103/PhysRevLett.113.212004

A search for excited states of the Bc± 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 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±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 Bc± meson, Bc±(2S).
Permanent Link: http://hdl.handle.net/11104/0243324