Observation of B+ ---> anti-xi(c)0 Lambda(c)+ and evidence for B0 ---> anti-xi(c)- Lambda(c)+
Oct, 20055 pages
Published in:
- Phys.Rev.D 74 (2006) 111105
e-Print:
- hep-ex/0510074 [hep-ex]
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Abstract: (arXiv)
We report the first observation of the decay B+ -> \bar{\Xi}_c^0 \Lambda_c^+ with a significance of 8.7 \sigma and evidence for the decay B^0 -> \bar{\Xi}_c^-\Lambda_c^+ with a significance of 3.8 \sigma. The product Br(B^+ -> \bar{\Xi}_c^0\Lambda_c^+)\times Br(\bar{\Xi}_c^0 -> \bar{\Xi}^+\pi^-) is measured to be (4.8^{+1.0}_{-0.9}\pm 1.1\pm 1.2)\times 10^{-5}, and Br({B^0} -> \bar{\Xi}_c^-\Lambda_c^+)\times Br(\bar{\Xi}_c^- -> \bar{\Xi}^+\pi^-\pi^-) is measured to be (9.3^{+3.7}_{-2.8}\pm 1.9\pm 2.4)\times 10^{-5}. The errors are statistical, systematic and the error of the \Lambda_c^+ -> pK^-\pi^+ branching fraction, respectively. The decay B^+ -> \bar{\Xi}_c^0\Lambda_c^+ is the first example of a two-body exclusive B^+ decay into two charmed baryons. The data used for this analysis was accumulated at the \Upsilon(4S) resonance, using the Belle detector at the e^+ e^- asymmetric-energy collider KEKB. The integrated luminosity of the data sample is equal to 357 {fb}^{-1}, corresponding to 386\times 10^{6} B{\bar B} pairs.- 14.20.Lq
- 13.25.Hw
- 13.30.Eg
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B: hadronic decay
- charmed baryon: pair production
- Xi/c0: antiparticle
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