Year: 2007
Type: article
Abstract: We present measurements of the total production rates and momentum distributions of the charmed baryon ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{\text{hadrons}}$ at a center-of-mass energy of 10.54 GeV and in $\mathit{\ensuremath{\Upsilon}}(4S)$ decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ events, allowing direct studies of $c$-quark fragmentation. We measure a momentum distribution for ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ 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 $⟨{x}_{p}⟩=0.574\ifmmode\pm\else\textpm\fi{}0.009$ and a total rate of ${N}_{\mathit{\ensuremath{\Lambda}}c}^{q\overline{q}}=0.057\ifmmode\pm\else\textpm\fi{}0.002(\mathrm{exp}.)\ifmmode\pm\else\textpm\fi{}0.015(\mathrm{BF})\text{ }\text{ }{\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, $p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. In $\mathit{\ensuremath{\Upsilon}}(4S)$ decays we measure a total rate of ${N}_{\mathit{\ensuremath{\Lambda}}c}^{\mathit{\ensuremath{\Upsilon}}}=0.091\ifmmode\pm\else\textpm\fi{}0.006(\mathrm{exp}.)\ifmmode\pm\else\textpm\fi{}0.024(\mathrm{BF})$ per $\mathit{\ensuremath{\Upsilon}}(4S)$ decay, and find a much softer momentum distribution than expected from $B$ decays into a ${\mathit{\ensuremath{\Lambda}}}_{c}^{+}$ plus an antinucleon and one to three pions.
Authors: B. Aubert, M. Bona, D. Boutigny, F. Couderc, Y. Karyotakis, J. P. Lees, V. Poireau, V. Tisserand, A. Zghiche, E. Grauges, A. Palano, J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu, G. Eigen, I. Ofte, B. Stugu, G. S. Abrams, M. Battaglia, D. N. Brown, J. Button-Shafer, R. N. Cahn, E. Charles, M. S. Gill, Y. Groysman, R. G. Jacobsen, J. A. Kadyk, L. T. Kerth, Yu. G. Kolomensky, G. Kukartsev, G. Lynch, L. M. Mir, T. J. Orimoto, M. Pripstein, N. A. Roe, M. T. Ronan, W. A. Wenzel, P. del Amo Sanchez, M. Barrett, K. E. Ford, T. J. Harrison, A. J. Hart, C. M. Hawkes, A. T. Watson, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, K. Peters, T. Schroeder, M. Steinke, J. T. Boyd, J. P. Burke, W. N. Cottingham, D. Walker, D. J. Asgeirsson, T. Cuhadar-Donszelmann, B. G. Fulsom, C. Hearty, N. S. Knecht, T. S. Mattison, J. A. McKenna, A. Khan, P. Kyberd, M. Saleem, D. J. Sherwood, L. Teodorescu, V. E. Blinov, A. D. Bukin, V. P. Druzhinin, V. B. Golubev, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu Todyshev, M. Bondioli, M. Bruinsma, M. Chao, S. Curry, I. Eschrich, D. Kirkby, A. J. Lankford, P. Lund, M. Mandelkern, R. K. Mommsen, W. Roethel, D. P. Stoker, S. Abachi, C. Buchanan, S. D. Foulkes, J. W. Gary, O. Long, B. C. Shen, K. Wang, L. Zhang, H. K. Hadavand, E. J. Hill, H. P. Paar, S. Rahatlou, V. Sharma, J. W. Berryhill, C. Campagnari, A. Cunha, B. Dahmes, T. M. Hong, D. Kovalskyi, J. D. Richman, T. W. Beck, A. M. Eisner, C. J. Flacco, C. A. Heusch, J. Kroseberg, W. S. Lockman, G. Nesom, T. Schalk, B. A. Schumm, A. Seiden, P. Spradlin, D. C. Williams, M. G. Wilson, J. Albert, E. Chen, A. Dvoretskii, F. Fang, D. G. Hitlin, I. Narsky, T. Piatenko, F. C. Porter, A. Ryd, G. Mancinelli, B. T. Meadows, K. Mishra, M. D. Sokoloff, F. Blanc, P. C. Bloom, S. Chen, W. T. Ford, J. F. Hirschauer, A. Kreisel, M. Nagel, U. Nauenberg, A. Olivas, W. O. Ruddick, J. G. Smith, K. A. Ulmer, S. R. Wagner, J. Zhang, A. Chen, E. A. Eckhart, A. 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Institutions: Centre National de la Recherche Scientifique, Laboratoire d’Annecy de Physique des Particules, Institut National de Physique Nucléaire et de Physique des Particules, Universitat de Barcelona, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, University of Bari Aldo Moro, Institute of High Energy Physics, University of Bergen, Lawrence Berkeley National Laboratory, University of California, Berkeley, University of Louisville, University of Birmingham, Ruhr University Bochum, University of Bristol, University of British Columbia, Brunel University of London, Budker Institute of Nuclear Physics, University of California, Irvine, University of California, Los Angeles, University of California, Riverside, University of California San Diego, University of California, Santa Barbara, University of California, Santa Cruz, California Institute of Technology, University of Cincinnati, University of Colorado Boulder, Colorado State University, TU Dortmund University, Technische Universität Dresden, École Polytechnique, Laboratoire Leprince-Ringuet, University of Edinburgh, Istituto Nazionale di Fisica Nucleare, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, Harvard University, Heidelberg University, Imperial College London, University of Iowa, Iowa State University, Johns Hopkins University, Karlsruhe Institute of Technology, Université Paris-Sud, Laboratoire de l'Accélérateur Linéaire, Lawrence Livermore National Laboratory, SLAC National Accelerator Laboratory, University of Liverpool, Queen Mary University of London, University of London, Royal Holloway University of London, The Ohio State University, University of Manchester, University of Maryland, College Park, University of Massachusetts Amherst, Massachusetts Institute of Technology, McGill University, University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, University of Mississippi, Université de Montréal, Mount Holyoke College, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Naples Federico II, National Institute for Subatomic Physics, University of Notre Dame, University of Oregon, University of Padua, Laboratoire de Physique Nucléaire et de Hautes Énergies, Université Paris Diderot, Université Pierre-et-Marie-Curie, University of Pennsylvania, University of Perugia, University of Pisa, Scuola Normale Superiore, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Prairie View A&M University, Princeton University, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Sapienza University of Rome, University of Rostock, Rutherford Appleton Laboratory, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Paris-Saclay, University of Wisconsin–Madison, University of South Carolina, Stanford University, State University of New York, University at Albany, State University of New York, University of Tennessee at Knoxville, The University of Texas at Austin, The University of Texas at Dallas, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, University of Turin, University of Trieste, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Universitat de València, University of Victoria, University of Warwick, Yale University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Alfred P. Sloan Foundation, European Commission, Deutsche Forschungsgemeinschaft, Norges Forskningsråd, Istituto Nazionale di Fisica Nucleare, Science and Technology Facilities Council, Institute of High Energy Physics, High Energy Physics, SLAC National Accelerator Laboratory
Award: G2222425277
OpenAlex ID: W2162928055