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Observation of a new ? b baryon

Abstract: The observation of a new b baryon via its strong decay into ??b?+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at ?s=7??TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3??fb?1. The known ??b baryon is reconstructed via the decay chain ??b?J/?????+???0??, with ?0?p??. A peak is observed in the distribution of the difference between the mass of the ??b?+ system and the sum of the masses of the ??b and ?+, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14.84±0.74(stat)±0.28(syst)??MeV. The new state most likely corresponds to the JP=3/2+ companion of the ?b. .

Other publications of the same journal or congress with authors from the University of Cantabria

Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumeiko N.,

Fuente: Physical Review Letters, 2012, 108(25), 252002

Publisher: American Physical Society

Publication date: 01/06/2012

No. of pages: 15

Publication type: Article

DOI: 10.1103/PhysRevLett.108.252002

ISSN: 0031-9007,1079-7114

Publication Url: https://doi.org/10.1103/PhysRevLett.108.252002

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