• Open Access

Observation of New Resonances in the Λb0π+π System

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 123, 152001 – Published 11 October 2019
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Abstract

We report the observation of a new structure in the Λb0π+π spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9fb1, collected at s=7, 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be mΛb(6146)0=6146.17±0.33±0.22±0.16MeV,mΛb(6152)0=6152.51±0.26±0.22±0.16MeV,ΓΛb(6146)0=2.9±1.3±0.3MeV,ΓΛb(6152)0=2.1±0.8±0.3MeV,with a mass splitting of Δm=6.34±0.32±0.02MeV, where the first uncertainty is statistical, the second systematic. The third uncertainty for the mass measurements derives from the knowledge of the mass of the Λb0 baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of Λb(1D)0 states.

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  • Received 6 August 2019
  • Revised 27 August 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.152001

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

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Vol. 123, Iss. 15 — 11 October 2019

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