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Published June 1, 2014 | Submitted + Published
Journal Article Open

Dalitz plot analysis of η_c → K^+K^−η and η_c → K^+K^−π^0 in two-photon interactions


We study the processes γγ→K^+K^−η and γγ→K^+K^−π^0 using a data sample of 519  fb^(−1) recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e^+e^− collider at center-of-mass energies at and near the Υ(nS) (n=2,3,4) resonances. We observe η_c→K^+K^−π^0 and η_c→K^+K^−η decays, measure their relative branching fraction, and perform a Dalitz plot analysis for each decay. We observe the K^∗_0(1430)→Kη decay and measure its branching fraction relative to the Kπ decay mode to be R(K^∗_0(1430))=^(B(K^∗_0(1430)→Kη))_(B(K^∗_0(1430)→Kπ))=0.092±0.025^(+0.010)_(−0.025). The η_c→K^+K^−η and K^∗_0(1430)→Kη results correspond to the first observations of these channels. The data also show evidence for η_c(2S)→K^+K^−π^0 and first evidence for η_c(2S)→K^+K^−η.

Additional Information

© 2014 American Physical Society. Published 16 June 2014. Received 27 March 2014. We are grateful for the extraordinary contributions of our PEP-II2 colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Economia y Competitividad (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (USA) and the Binational Science Foundation (USA-Israel).

Attached Files

Published - PhysRevD.89.112004.pdf

Submitted - 1403.7051v1.pdf


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