Abstract
We report evidence for the charged charmed-strange baryon Xi _{c}(2930)^+ with a signal significance of 3.9sigma with systematic errors included. The charged Xi _{c}(2930)^+ is found in its decay to K_{S}^{0} Lambda _{c}^+ in the substructure of bar{B}^{0} rightarrow K^{0}_{S} Lambda _{c}^{+} bar{Lambda }_{c}^{-} decays. The measured mass and width are [2942.3 pm 4.4 ({mathrm{stat.}}) pm {1.5}({mathrm{syst.}})] MeV/c^{2} and [14.8 pm 8.8({mathrm{stat.}}) pm {2.5}({mathrm{syst.}})] MeV, respectively, and the product branching fraction is mathcal{B}(bar{B}^{0} rightarrow Xi _c(2930)^{+} bar{Lambda }_{c}^{-}) mathcal{B}(Xi _c(2930)^{+}rightarrow bar{K}^{0} Lambda _{c}^{+})=[2.37 pm 0.51 ({mathrm{stat.}})pm 0.31({mathrm{syst.}})]times 10^{-4}. We also measure mathcal{B}(bar{B}^{0} rightarrow bar{K}^{0} Lambda _{c}^{+} bar{Lambda }_{c}^{-}) = [3.99 pm 0.76({mathrm{stat.}}) pm 0.51({mathrm{syst.}})] times 10^{-4} with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, Y_{eta }, in the Lambda _{c}^{+}bar{Lambda }_{c}^{-} invariant mass spectrum. No clear signals of the Y(4660) or Y_{eta } are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772pm 11)times 10^{6} Bbar{B} pairs collected at the Upsilon (4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.
Highlights
No clear signals of the Y (4660) or Yη are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined
While many new excited charmed baryons have been discovered in experiments in recent years, and there has been dedicated theoretical work devoted to study the nature of charmed baryon such as the baryon internal structure and quark configuration, further cooperative efforts are needed from both experimentalists and theorists to make progress in this area
According to the signal Monte Carlo (MC) simulation, the mass resolution of c candidates is almost independent of the c decay mode
Summary
Niewodniczanski Institute of Nuclear Physics, 31-342 Krakow, Poland Nippon Dental University, Niigata 951-8580, Japan Niigata University, Niigata 950-2181, Japan Novosibirsk State University, Novosibirsk 630090, Russia Osaka City University, Osaka 558-8585, Japan Pacific Northwest National Laboratory, Richland, WA 99352, USA Panjab University, Chandigarh 160014, India Peking University, Beijing 100871, China University of Pittsburgh,, Pittsburgh PA 15260, USA Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan University of Science and Technology of China, Hefei 230026, China Showa Pharmaceutical University, Tokyo 194-8543, China Soongsil University, Seoul 156-743, South Korea Stefan Meyer Institute for Subatomic Physics, 1090 Vienna, Austria Sungkyunkwan University, Suwon 440-746, South Korea School of Physics, University of Sydney, Sydney, NSW 2006, Australia Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Saudi Arabia Tata Institute of Fundamental Research, Mumbai 400005, India Department of Physics, Technische Universität München, 85748 Garching, Germany Department of Physics, Tohoku University, Sendai 980-8578, Japan Department of Physics, University of Tokyo, Tokyo 113-0033, Japan Tokyo Institute of Technology, Tokyo 152-8550, Japan Tokyo Metropolitan University, Tokyo 192-0397, Japan Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA Wayne State University, Detroit, MI 48202, USA Yamagata University, Yamagata 990-8560, Japan Yonsei University, Seoul 120-749, South Korea
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