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 decayB(c)(+/-) -> J/psi pi(+/-). The state appears in the m(B-c(+/-)pi(+)pi(-)) - m(B-c(+/-)) - 2m(pi(+/-)) 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).

Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector / Aad, G., Abbott, B., Abdallah, J., Khalek, S.a., Abdinov, O., Aben, R., Abi, B., Abolins, M., Abouzeid, O.s., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.s., Adamczyk, L., Adams, D.l., Adelman, J., Adomeit, S., Adye, T., Agatonovic-Jovin, T., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:21(2014). [10.1103/PhysRevLett.113.212004]

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

Gonella L;
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 decayB(c)(+/-) -> J/psi pi(+/-). The state appears in the m(B-c(+/-)pi(+)pi(-)) - m(B-c(+/-)) - 2m(pi(+/-)) 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).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3090801
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