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CorrelatedΛc+Λ¯c−production ine+e−annihilations ats∼10.5 GeV

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields2001Vol. 63(11)

A. Bornheim, E. Lipeles, S. P. Pappas, M. Śchmidtler, A. Shapiro, W. Sun, A. J. Weinstein, D. E. Jaffe, R. Mahapatra, G. Masek, H. P. Paar, D. M. Asner, A. Eppich, T. S. Hill, R. J. Morrison, R. A. Briere, G. P. Chen, T. Ferguson, H. Vogel, A. V. Gritsan, J. Alexander, R. Baker, C. Bebek, B. E. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, P. Gaidarev, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, M. Lohner, A. Magerkurth, T. O. Meyer, N. B. Mistry, E. Nordberg, M. Palmer, T. Sanuki, D. Peterson, D. Riley, A. Romano, J. G. Thayer, D. Urner, B. Valant-Spaight, G. H. A. Viehhauser, A. Warburton, P. Avery, C. Prescott, A. I. Rubiera, H. Stoeck, J. Yelton, G. Brandenburg, A. Ershov, D. Y.-J. Kim, R. Wilson, T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. S. Williams, K. W. Edwards, R. Janicek, P. M. Patel, A. J. Sadoff, R. Ammar, A. Bean, D. Besson, P. Brabant, X. Zhao, S. Anderson, V. Frolov, Y. Kubota, S. J. Lee, J. J. O’Neill, R. Poling, T. Riehle, A. Smith, C. J. Stepaniak, J. Urheim, S. Ahmed, M. S. Alam, S. B. Athar, L. Jian, L. Ling, M. Saleem, S. Timm, F. Wappler, A. Anastassov, E. A. Eckhart, K. K. Gan, C. Gwon, T. Hart, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, H. Schwarthoff, J. B. Thayer, E. von Toerne, M. M. Zoeller, S. J. Richichi, H. Severini, P. Skubic, A. Undrus, V. Savinov, S. Chen, J. Fast, J. W. Hinson, J. Lee, D. H. Miller, E. I. Shibata, I. P. J. Shipsey, V. Pavlunin, D. Cronin-Hennessy, A. L. Lyon, E. H. Thorndike, T. E. Coan, V. Fadeyev, Y. S. Gao, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, T. Wlodek, M. Artuso, C. Boulahouache, K. Bukin, E. Dambasuren, D. Majumder, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, J. C. Wang, A. Wolf, J. Wu, S. Köpp, M. Kostin, A. H. Mahmood, S. E. Csorna, I. Dankó, K. W. McLean, Z. Xu, R. Godang, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, G. J. Zhou

Abstract

Using 13.6 ${\mathrm{fb}}^{\ensuremath{-}1}$ of continuum two-jet ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ events collected with the CLEO detector, we have searched for baryon number correlations at the primary quark level. We have measured the likelihood for a ${\ensuremath{\Lambda}}_{c}^{+}$ charmed baryon to be produced in the hemisphere opposite a ${\overline{\ensuremath{\Lambda}}}_{c}^{\ensuremath{-}}$ relative to the likelihood for a ${\ensuremath{\Lambda}}_{c}^{+}$ charmed baryon to be produced opposite an anticharmed meson $\overline{D};$ in all cases, the reconstructed hadrons must have momentum greater than 2.3 $\mathrm{GeV}/c.$ We find that, given a ${\overline{\ensuremath{\Lambda}}}_{c}^{\ensuremath{-}}$ (reconstructed in five different decay modes), a ${\ensuremath{\Lambda}}_{c}^{+}$ is observed in the opposite hemisphere $(0.72\ifmmode\pm\else\textpm\fi{}0.11)%$ of the time (not corrected for efficiency). By contrast, given a $\overline{D}$ in one hemisphere, a ${\ensuremath{\Lambda}}_{c}^{+}$ is observed in the opposite hemisphere only $(0.21\ifmmode\pm\else\textpm\fi{}0.02)%$ of the time. Normalized to the total number of either ${\overline{\ensuremath{\Lambda}}}_{c}^{\ensuremath{-}}$ or $\overline{D}$ ``tags,'' it is therefore $3.52\ifmmode\pm\else\textpm\fi{}0.45\ifmmode\pm\else\textpm\fi{}0.42$ times more likely to find a ${\ensuremath{\Lambda}}_{c}^{+}$ opposite a ${\overline{\ensuremath{\Lambda}}}_{c}^{\ensuremath{-}}$ than a $\overline{D}$ meson. This enhancement is not observed in the JETSET 7.3 ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ Monte Carlo simulation.

Abstract

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