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Observation of Υ(4S) Decays to π^+π^-Υ(1S) and π^+π^-Υ(2S)

Aubert, B. and Albert, J. and Chen, E. and Dvoretskii, A. and Hitlin, D. G. and Narsky, I. and Piatenko, T. and Porter, F. C. and Ryd, A. and Samuel, A. (2006) Observation of Υ(4S) Decays to π^+π^-Υ(1S) and π^+π^-Υ(2S). Physical Review Letters, 96 (23). Art. No. 232001. ISSN 0031-9007. doi:10.1103/PhysRevLett.96.232001.

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We present the first measurement of Υ(4S) decays to π^+π^-Υ(1S) and π^+π^-Υ(2S) based on a sample of 230×10^6Υ(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Υ(4S)→π^+π^-Υ(1S))×B(Υ(1S)→μ^+μ^-)=(2.23±0.25_(stat)±0.27_(syst))×10^(-6) and B(Υ(4S)→π^+π^-Υ(2S))×B(Υ(2S)→μ^+μ^-)=(1.69±0.26_(stat)±0.20_(syst))×10^(-6), from which we derive the partial widths Γ(Υ(4S)→π^+π^-Υ(1S))=(1.8±0.4)  keV and Γ(Υ(4S)→π^+π^-Υ(2S))=(2.7±0.8)  keV.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
Additional Information:© 2006 The American Physical Society. Received 14 April 2006; published 13 June 2006. 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), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from CONACyT (Mexico), Marie Curie EIF (European Union), the A. P. Sloan Foundation, the Research Corporation, and the Alexander von Humboldt Foundation
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Institute of High Energy Physics (IHEP) (China)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA) (France)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS) (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF) (Germany)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG) (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN) (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (FOM) (The Netherlands)UNSPECIFIED
Research Council of Norway (NFR)(Norway)UNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC) (UK)UNSPECIFIED
Consejo Nacional de Ciencia y Tecnología (CONACyT) (Mexico)UNSPECIFIED
Marie-Curie IEF program (European Union)UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Research CorporationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Issue or Number:23
Classification Code:PACS: 13.25.Gv, 14.40.Gx
Record Number:CaltechAUTHORS:20110216-075407426
Persistent URL:
Official Citation:Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S) B. Aubert et al. (BABAR Collaboration) Published 13 June 2006 (7 pages) 232001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22230
Deposited By: Ruth Sustaita
Deposited On:16 Feb 2011 16:38
Last Modified:09 Nov 2021 16:03

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