Abstract
A highly significant structure is observed in the mass spectrum, where the baryon is reconstructed in the decay mode . The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon . The difference between the masses of the and states is measured to be , and the mass is then determined to be , where the last uncertainty is due to the limited knowledge of the mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of , and confirmed in an additional sample of data collected at 8 TeV.
- Received 6 July 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.112001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
© 2017 CERN, for the LHCb Collaboration
Physics Subject Headings (PhySH)
Viewpoint
A Doubly Charming Particle
Published 11 September 2017
High-precision experiments at CERN find a new baryon containing two charm quarks.
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