• Featured in Physics
  • Editors' Suggestion
  • Open Access

Observation of a New Ξb Baryon

S. Chatrchyan et al. (CMS Collaboration)
Phys. Rev. Lett. 108, 252002 – Published 21 June 2012
Physics logo See Synopsis: Strange Beauty

Abstract

The observation of a new b baryon via its strong decay into Ξbπ+ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at s=7TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 5.3fb1. The known Ξb baryon is reconstructed via the decay chain ΞbJ/ψΞμ+μΛ0π, with Λ0pπ. A peak is observed in the distribution of the difference between the mass of the Ξbπ+ system and the sum of the masses of the Ξb and π+, 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 Ξb.

  • Figure
  • Figure
  • Received 26 April 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.252002

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2012 CERN, for the CMS Collaboration

Synopsis

Key Image

Strange Beauty

Published 21 June 2012

A new baryon has been discovered by the CMS collaboration at the Large Hadron Collider.

See more in Physics

Authors & Affiliations

Click to Expand

Article Text

Click to Expand

References

Click to Expand
Issue

Vol. 108, Iss. 25 — 22 June 2012

Reuse & Permissions
Access Options
CHORUS

Article part of CHORUS

Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 3.0 License. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

×

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×