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Measurements of B(B̄0→Λc+p̄) and B(B- →Λc+p̄π-) and studies of Λc+π- resonances

  • Author(s): Aubert, B;
  • Bona, M;
  • Karyotakis, Y;
  • Lees, JP;
  • Poireau, V;
  • Prencipe, E;
  • Prudent, X;
  • Tisserand, V;
  • Garra Tico, J;
  • Grauges, E;
  • Lopez, L;
  • Palano, A;
  • Pappagallo, M;
  • Eigen, G;
  • Stugu, B;
  • Sun, L;
  • Abrams, GS;
  • Battaglia, M;
  • Brown, DN;
  • Cahn, RN;
  • Jacobsen, RG;
  • Kerth, LT;
  • Kolomensky, YG;
  • Kukartsev, G;
  • Lynch, G;
  • Osipenkov, IL;
  • Ronan, MT;
  • Tackmann, K;
  • Tanabe, T;
  • Hawkes, CM;
  • Soni, N;
  • Watson, AT;
  • Koch, H;
  • Schroeder, T;
  • Walker, D;
  • Asgeirsson, DJ;
  • Cuhadar-Donszelmann, T;
  • Fulsom, BG;
  • Hearty, C;
  • Mattison, TS;
  • McKenna, JA;
  • Barrett, M;
  • Khan, A;
  • Teodorescu, L;
  • Blinov, VE;
  • Bukin, AD;
  • Buzykaev, AR;
  • Druzhinin, VP;
  • Golubev, VB;
  • Onuchin, AP;
  • Serednyakov, SI;
  • Skovpen, YI;
  • Solodov, EP;
  • Todyshev, KY;
  • Bondioli, M;
  • Curry, S;
  • Eschrich, I;
  • Kirkby, D;
  • Lankford, AJ;
  • Lund, P;
  • Mandelkern, M;
  • Martin, EC;
  • Stoker, DP;
  • Abachi, S;
  • Buchanan, C;
  • Gary, JW;
  • Liu, F;
  • Long, O;
  • Shen, BC;
  • Vitug, GM;
  • Yasin, Z;
  • Zhang, L;
  • Sharma, V;
  • Campagnari, C;
  • Hong, TM;
  • Kovalskyi, D;
  • Mazur, MA;
  • Richman, JD;
  • Beck, TW;
  • Eisner, AM;
  • Flacco, CJ;
  • Heusch, CA;
  • Kroseberg, J;
  • Lockman, WS;
  • Schalk, T;
  • Schumm, BA;
  • Seiden, A;
  • Wang, L;
  • Wilson, MG;
  • Winstrom, LO;
  • Cheng, CH;
  • Doll, DA;
  • Echenard, B;
  • Fang, F;
  • Hitlin, DG;
  • Narsky, I;
  • Piatenko, T;
  • Porter, FC;
  • Andreassen, R;
  • Mancinelli, G
  • et al.

Published Web Location

https://doi.org/10.1103/PhysRevD.78.112003Creative Commons 'BY' version 4.0 license
Abstract

We present an investigation of the decays B̄0→Λc+p̄ and B-→Λc+p̄π- based on 383×106 Υ(4S) →BB̄ decays recorded with the BABAR detector. We measure the branching fractions of these decays; their ratio is B(B-→Λc+p̄π-)/ B(B̄0→Λc+p̄)=15.4±1.8±0.3. The B-→Λc+p̄π- process exhibits an enhancement at the Λc+p̄ threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays B-→Σc(2455)0p̄ and B-→Σc(2800)0p̄ but see no evidence for B-→Σc(2520) 0p̄. This is the first observation of the decay B-→Σc(2800) 0p̄; however, the mass of the observed excited Σc0 state is (2846±8±10)MeV/c2, which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the B-→Σc(2455)0p̄ decays and measure the spin of the Σc(2455)0 baryon to be 1/2, as predicted by the quark model. © 2008 The American Physical Society.

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