Confirmation of the X(1835) and Observation of the Resonances X(2120) and X(2370) in J/ψγπ+πη

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 106, 072002 – Published 16 February 2011

Abstract

With a sample of (225.2±2.8)×106 J/ψ events registered in the BESIII detector, J/ψγπ+πη is studied using two η decay modes: ηπ+πη and ηγρ0. The X(1835), which was previously observed by BESII, is confirmed with a statistical significance that is larger than 20σ. In addition, in the π+πη invariant-mass spectrum, the X(2120) and the X(2370), are observed with statistical significances larger than 7.2σ and 6.4σ, respectively. For the X(1835), the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar.

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  • Received 16 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.072002

© 2011 American Physical Society

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Vol. 106, Iss. 7 — 18 February 2011

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