Observation of an Excited $B_c^\pm$ Meson State with the ATLAS Detector

Observation of an Excited $B_c^\pm$ Meson State with the ATLAS Detector

A search for excited states of the Bc+/- meson is performed using 4.9 inv. fb of 7 TeV and 19.2 inv. fb 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+/- --...

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Veröffentlicht in:Physical review letters 2014-07, Vol.113
Hauptverfasser: Aad, G., Abdel Khalek, S., Bassalat, A., Becot, C., Binet, S., Bourdarios, C., Charfeddine, D., de Vivie de Regie, J.B., Duflot, L., Escalier, M., Fayard, L., Fournier, D., Grivaz, J.-F., Guillemin, T., Henrot-Versillé, S., Hrivnac, J., Iconomidou-Fayard, L., Kado, M., Lounis, A., Makovec, N., Matricon, P., Poggioli, L., Puzo, P., Renaud, A., Rousseau, D., Rybkin, G., Schaffer, A.C., Scifo, E., Serin, L., Simion, S., Tanaka, R., Tran, H.L., Zerwas, D., Zhang, Zhiqing, Rahal, G., Boumediene, D., Busato, Emmanuel, Calvet, D., Calvet, S., Donini, J., Dubreuil, E., Ghodbane, N., Gilles, G., Gris, Ph, Guicheney, C., Liao, H., Pallin, D., Paredes Hernández, Daniela, Podlyski, F., Santoni, C., Theveneaux-Pelzer, Timothée, Valery, Loïc, Vazeille, F., Albrand, S., Brown, J., Collot, J., Crépé-Renaudin, S., Dechenaux, B., Delsart, P.A., Gabaldon, C., Genest, M.H., Hostachy, J.Y., Le, B.T., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Monini, C., Stark, J., Trocmé, B., Wu, M., Barnovska, Z., Berger, N., Delmastro, M., Di Ciaccio, L., Doan, T.K.O., Elles, S., Goy, C., Hryn'Ova, T., Jézéquel, S., Keoshkerian, H., Koletsou, I., Lafaye, R., Leveque, J., Lombardo, V.P., Massol, N., Przysiezniak, H., Sauvage, G., Sauvan, E., Schwoerer, M., Simard, O., Todorov, T., Wingerter-Seez, I., Alio, L., Barbero, M., Bertella, C., Clémens, J. C., Coadou, Y., Diglio, Sara, Djama, F.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:A search for excited states of the Bc+/- meson is performed using 4.9 inv. fb of 7 TeV and 19.2 inv. fb 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/psi pi+/-. The state appears in the m(Bc+/- pi+ pi-) - m(Bc+/-) - 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 Bc, Bc(2S).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.212004