Observation of an Excited B± Meson State with the ATLAS Detector
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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 decay B±c→J/ψπ±. The state appears in the m(B±cπ+π−)−m(B±c)−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 B±c meson, B±c(2S).
Original language | English |
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Article number | 212004 |
Journal | Physical Review Letters |
Volume | 113 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 3 Jul 2014 |
ID: 130019368