A search for excited states of the B c meson is performed using 4.9 fb−1 of 7 TeVand 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 mðB c πþπ−Þ − mðB c Þ − 2mðπÞ 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 ð2SÞ.

Observation of an excited B±c meson state with the ATLAS detector

CONTA, CLAUDIO;DONDERO, PAOLO;FRATERNALI, MARCO;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2014-01-01

Abstract

A search for excited states of the B c meson is performed using 4.9 fb−1 of 7 TeVand 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 mðB c πþπ−Þ − mðB c Þ − 2mðπÞ 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 ð2SÞ.
2014
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113
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212004
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http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.113.212004/apsxml
2884
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262
Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; Abouzeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1107590
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