Observation of ηc(1S) and ηc(2S) decays to K+Kπ+ππ0 in two-photon interactions

P. del Amo Sanchez et al. (The BABAR Collaboration)
Phys. Rev. D 84, 012004 – Published 15 July 2011

Abstract

We study the processes γγKS0K±π and γγK+Kπ+ππ0 using a data sample of 519.2fb1 recorded by the BABAR detector at the PEP-II asymmetric-energy e+e collider at center-of-mass energies near the Υ(nS) (n=2, 3, 4) resonances. We observe the ηc(1S), χc0(1P) and ηc(2S) resonances produced in two-photon interactions and decaying to K+Kπ+ππ0, with significances of 18.1, 5.4 and 5.3 standard deviations (including systematic errors), respectively, and report 4.0σ evidence of the χc2(1P) decay to this final state. We measure the ηc(2S) mass and width in KS0K±π decays, and obtain the values m(ηc(2S))=3638.5±1.5±0.8MeV/c2 and Γ(ηc(2S))=13.4±4.6±3.2MeV, where the first uncertainty is statistical and the second is systematic. We measure the two-photon width times branching fraction for the reported resonance signals, and search for the χc2(2P) resonance, but no significant signal is observed.

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  • Received 21 March 2011

DOI:https://doi.org/10.1103/PhysRevD.84.012004

© 2011 American Physical Society

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Vol. 84, Iss. 1 — 1 July 2011

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