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Inclusive Λ_c^+ production in e^+e^- annihilations at √s=10.54  GeV and in Υ(4S) decays

Aubert, B. and Albert, J. and Chen, E. and Dvoretskii, A. and Fang, F. and Hitlin, D. G. and Narsky, I. and Piatenko, T. and Porter, F. C. and Ryd, A. (2007) Inclusive Λ_c^+ production in e^+e^- annihilations at √s=10.54  GeV and in Υ(4S) decays. Physical Review D, 75 (1). Art. No. 012003. ISSN 1550-7998 . https://resolver.caltech.edu/CaltechAUTHORS:20100818-145238616

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Abstract

We present measurements of the total production rates and momentum distributions of the charmed baryon Λ_c^+ in e^+e^-→hadrons at a center-of-mass energy of 10.54 GeV and in Υ(4S) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e^+e^-→cc[overbar] events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Λ_c^+ baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of <x_p>=0.574±0.009 and a total rate of N_(Λc)^(qq[overbar]) =0.057±0.002(exp)±0.015(BF)  Λ_c^+ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pK^-π^+. In Υ(4S) decays we measure a total rate of N_(Λc)^Υ=0.091±0.006(exp)±0.024(BF) per Υ(4S) decay, and find a much softer momentum distribution than expected from B decays into a Λ_c^+ plus an antinucleon and one to three pions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.75.012003 DOIArticle
http://prd.aps.org/abstract/PRD/v75/i1/e012003PublisherArticle
Additional Information:© 2007 The American Physical Society. Received 5 September 2006; published 9 January 2007. 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), Institute of High Energy Physics (China), 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 Science and Technology of the Russian Federation, Ministerio de Educación y Ciencia (Spain), and the Particle Physics and Astronomy Research Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.
Funders:
Funding AgencyGrant Number
U.S. Department of Energy UNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council (Canada)UNSPECIFIED
Institute of High Energy Physics (China)UNSPECIFIED
Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung (Germany)UNSPECIFIED
Deutsche Forschungsgemeinschaft (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Science and Technology of the Russian FederationUNSPECIFIED
Ministerio de Educación y Ciencia (Spain)UNSPECIFIED
Particle Physics and Astronomy Research Council (United Kingdom)UNSPECIFIED
Marie-Curie IEF program (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Issue or Number:1
Classification Code:PACS: 13.66.Bc, 13.20.He, 13.60.Rj
Record Number:CaltechAUTHORS:20100818-145238616
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100818-145238616
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19505
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Aug 2010 19:59
Last Modified:03 Oct 2019 01:58

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