Abstract
A narrow pentaquark state, , decaying to , is discovered with a statistical significance of in a data sample of decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, and , where the statistical significance of this two-peak interpretation is . The proximity of the and thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
- Received 6 April 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.222001
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. Funded by SCOAP3.
© 2019 CERN, for the LHCb Collaboration
Physics Subject Headings (PhySH)
Synopsis
How a Pentaquark is Put Together
Published 5 June 2019
New Large Hadron Collider data reveal that exotic quark quintets, discovered in 2016, are composites of quark-antiquark mesons and three-quark baryons.
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