Year: 2001
Type: article
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.
Authors: A. Bornheim, E. Lipeles, S. P. Pappas, M. Schmidtler, A. Shapiro, W. M. 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. Gritsan, J. P. 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, J. R. Patterson, D. Peterson, D. Riley, A. Romano, J. G. Thayer, D. Urner, B. Valant-Spaight, G. 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. 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. 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. 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, G. Majumder, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, J. C. Wang, A. Wolf, J. Wu, S. Kopp, M. Kostin, A. H. Mahmood, S. E. Csorna, I. Danko, K. W. McLean, Z. Xu, R. Godang, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, G. J. Zhou
Institution: California Institute of Technology
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2607034328