Abstract
Signals consistent with the and states are observed in proton-proton collisions at , in an event sample corresponding to an integrated luminosity of , collected by the CMS experiment during the 2015–2018 LHC running periods. These excited states are observed in the invariant mass spectrum, with the ground state reconstructed through its decay to . The two states are reconstructed as two well-resolved peaks, separated in mass by . The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the meson is measured to be , where the last term corresponds to the uncertainty in the world-average mass.
- Received 1 February 2019
- Revised 18 February 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.132001
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 CMS Collaboration
Physics Subject Headings (PhySH)
Synopsis
Record LHC Haul Catches Double Meson Signal
Published 2 April 2019
A huge dataset recorded at the highest particle collision energy so-far observed resolves a puzzle by revealing two meson excited states.
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