Published January 1, 2009 | Version Published
Journal Article Open

Branching fractions and CP-violating asymmetries in radiative B decays to ηKγ

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Abstract

We present measurements of the CP-violation parameters S and C for the radiative decay B^0 → ηK^0_Sγ for B → ηKγ we also measure the branching fractions and for B^+ → ηK^+γ the time-integrated charge asymmetry A_(ch). The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 × 10^6 BB pairs produced in e^+e^- annihilation. The results are S = -0.18^(+0.49)_(-0.46) ± 0.12, C = -0.32^(+0.40)_(-0.39) ± 0.07, B(B^0 → ηK^0γ) = (7.1^(+2.1)_(-2.0) ± 0.4) × 10^(-6), B(B^+ → ηK^+γ) = (7.7 ± 1.0 ± 0.4) × 10^(-6), and A_(ch) = (-9.0^(+10.4)_(-9.8) ± 1.4) × 10^(-2). The first error quoted is statistical and the second systematic.

Additional Information

© 2009 The American Physical Society. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Additional details

Identifiers

Eprint ID
16209
Resolver ID
CaltechAUTHORS:20091007-093122088

Funding

Department of Energy (DOE)
NSF
Natural Sciences and Engineering Research Council of Canada (NSERC)
Commissariat à l'Énergie Atomique (CEA)
Centre National de la Recherche Scientifique (CNRS)
Federal Ministry of Education and Research (BMBF)
Deutsche Forschungsgemeinschaft (DFG)
Istituto Nazionale di Fisica Nucleare (INFN)
Stichting voor Fundamenteel Onderzoek der Materie (FOM)
Norwegian Research Council
Ministry of Education and Science of the Russian Federation
Ministerio de Educación y Ciencia (MEC)
Science and Technology Facilities Council (STFC)
Marie Curie Fellowship
Alfred P. Sloan Foundation

Dates

Created
2009-10-08
Created from EPrint's datestamp field
Updated
2021-11-08
Created from EPrint's last_modified field