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).

Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 113(21), 1-18 [10.1103/PhysRevLett.113.212004].

Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector

V. Bortolotto;F. Ceradini;B. Di Micco;R. Di Nardo;D. Orestano;F. Petrucci;D. Puddu;G. Salamanna;C. Taccini;M. Trovatelli;
2014-01-01

Abstract

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).
2014
Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., et al. (2014). Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 113(21), 1-18 [10.1103/PhysRevLett.113.212004].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/134150
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