Study of Υ(1S) radiative decays to γπ^+π^− and γK^+K^−

Creators: Lees, J. P.; Chao, D. S.; Cheng, C. H.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Kim, J.; Li, Y; Miyashita, T. S.; Ongmongkolkul, P.; Porter, F. C.; Röhrken, M.; BaBar Collaboration

Abstract

We study the Υ(1S) radiative decays to γπ^+π^− and γK^+K^− using data recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e^+e^− collider at center-of-mass energies at the Υ(2S) and Υ(3S) resonances. The Υ(1S) resonance is reconstructed from the decay Υ(nS)→π^+π^−Υ(1S), n=2, 3. Branching fraction measurements and spin-parity analyses of Υ(1S)radiative decays are reported for the I=0 S-wave and f_2(1270) resonances in the π^+π^− mass spectrum, the f′_2(1525) and f_0(1500) in the K^+K^− mass spectrum, and the f_0(1710) in both.

Additional Information

© 2018 American Physical Society. 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. Received 12 April 2018; published 21 June 2018. 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). We acknowledge P. Colangelo for useful suggestions.

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Published - PhysRevD.97.112006.pdf

Submitted - 1804.04044.pdf

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PhysRevD.97.112006.pdf

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