CaltechAUTHORS
Published January 1, 2016 | Version Published
Journal Article Open

Measurement of the I=1/2 Kπ S-wave amplitude from Dalitz plot analyses of η_c → KKπ in two-photon interactions

Creators

Abstract

We study the processes γγ→K^0_SK^±π^∓ 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 ηc decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 Kπ S-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5  GeV/c^2. In contrast, the amplitudes show very marked differences. The data require the presence of a new a_0(1950) resonance with parameters m=1931±14±22  MeV/c^2 and Γ=271±22±29  MeV.

Additional Information

© 2016 American Physical Society. Received 8 November 2015; published 20 January 2016. We are grateful for the extraordinary contributions of our PEP-II 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 (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). The work of A. Palano and M. R. Pennington was supported (in part) by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177.

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Published - PhysRevD.93.012005.pdf

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PhysRevD.93.012005.pdf

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Identifiers

Eprint ID
64428
Resolver ID
CaltechAUTHORS:20160211-132354664

Funding

Department of Energy (DOE)
DE-AC05- 06OR23177
NSF
Natural Sciences and Engineering Research Council of Canada (NSERC)
Commissariat à l'Energie Atomique (CEA)
Bundesministerium für Bildung und Forschung (BMBF)
Istituto Nazionale di Fisica Nucleare (INFN)
Stichting voor Fundamenteel Onderzoek der Materie (FOM)
Research Council of Norway
Ministry of Education and Science of the Russian Federation
Ministerio de Economia y Competitividad (MINECO)
Science and Technology Facilities Council (STFC)
Marie-Curie IEF Fellowship
Alfred P. Sloan Foundation
Binational Science Foundation (USA-Israel)
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
Deutsche Forschungsgemeinschaft (DFG)

Dates

Created
2016-02-18
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Updated
2021-11-10
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