Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
Observation of an Excited Bc± Meson State with the ATLAS detector
Presented by Neil McFadden (UNM)
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 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).
2:00 pm, Tuesday, March 31, 2015
PAIS-2540, PAIS
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