The observation of a new b baryon via its strong decay into b þ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at sqrt(s) = 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5:3 fb1. The known b baryon is reconstructed via the decay chain b ! J=c ! þ0, with 0 ! p. A peak is observed in the distribution of the difference between the mass of the b þ system and the sum of the masses of the b and þ, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14:84 0:74ðstatÞ 0:28ðsystÞ MeV. The new state most likely corresponds to the JP ¼ 3=2þ companion of the b.

S. CHACHTRYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2012). Observation of a new Xi(b) baryon. PHYSICAL REVIEW LETTERS, 108, 252002-1-252002-15 [10.1103/PhysRevLett.108.252002].

Observation of a new Xi(b) baryon.

BONACORSI, DANIELE;BRAIBANT, SYLVIE;CAPILUPPI, PAOLO;CASTRO, ANDREA;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;MENEGHELLI, MARCO;NAVARRIA, FRANCESCO LUIGI;PRIMAVERA, FEDERICA;ROSSI, ANTONIO MARIA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;GUIDUCCI, LUIGI;BRIGLIADORI, LUCA
2012

Abstract

The observation of a new b baryon via its strong decay into b þ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at sqrt(s) = 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5:3 fb1. The known b baryon is reconstructed via the decay chain b ! J=c ! þ0, with 0 ! p. A peak is observed in the distribution of the difference between the mass of the b þ system and the sum of the masses of the b and þ, with a significance exceeding 5 standard deviations. The mass difference of the peak is 14:84 0:74ðstatÞ 0:28ðsystÞ MeV. The new state most likely corresponds to the JP ¼ 3=2þ companion of the b.
2012
S. CHACHTRYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2012). Observation of a new Xi(b) baryon. PHYSICAL REVIEW LETTERS, 108, 252002-1-252002-15 [10.1103/PhysRevLett.108.252002].
S. CHACHTRYAN; V. KHACHATRYAN; A.M. SIRUNYAN; A. TUMASYAN; W. ADAM; T. BERGAUER; M. DRAGICEVIC; J. ERO; C. FABJAN; M. FRIEDL; R. FRUHWIRTH; V.M. GHETE...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/125490
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