Observation of a new $\Xi_{b}$ Baryon - INSPIRE

DataBETA

Observation of a new $\Xi_{b}$ Baryon

CMS

Collaboration

Apr, 2012

25 pages

Published in:

Phys.Rev.Lett. 108 (2012) 252002

e-Print:

1204.5955 [hep-ex]

DOI:

10.1103/PhysRevLett.108.252002

PDG:

{{\mathit \Xi}_{{{b}}}{(5945)}^{0}}

\rightarrow

{{\mathit \Xi}_{{{b}}}^{-}}{{\mathit \pi}^{+}}

Report number:

CMS-BPH-12-001,
CERN-PH-EP-2012-118

Experiments:

CERN-LHC-CMS

View in:

reference search119 citations

Citations per year

Abstract: (arXiv)

The first observation of a new b baryon via its strong decay into Xi(b)^- pi^+ (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 inverse femtobarns. The known Xi(b)^- baryon is reconstructed via the decay chain Xi(b)^- to J/psi Xi^- to mu^+ mu^- Lambda^0 pi^-, with Lambda^0 to p pi^-. A peak is observed in the distribution of the difference between the mass of the Xi(b)^- pi^+ system and the sum of the masses of the Xi(b)^- and pi^+, with a significance exceeding five 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 J^P=3/2^+ companion of the Xi(b).

Note:

Submitted to Physical Review Letters

14.20.Mr
Xi/b0: excited state
mass spectrum: mass difference
CMS
p p: interaction
bottom baryon: hadronic decay
track data analysis: vertex
experimental results
CERN LHC Coll
Xi/b0* --> Xi/b- pi+

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Figures(3)

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