Search for \bar{B}^0\toΛ_c^+\barΛ_c^- decay at Belle

Details Search for \bar{B}^0\toΛ_c^+\barΛ_c^- decay at Belle Search for \bar{B}^0\toΛ_c^+\barΛ_c^- decay at Belle

2007-08-08

arxiv.org/abs/0708.1105v2

Phys.Rev.D77:051101,2008

Physics

High Energy Physics

High Energy Physics - Experiment

12 page, 5 figures. Contribution paper for conferences EPS2007 and Lepton Photon 2007, Belle-Conference-0707

Scientific paper

10.1103/PhysRevD.77.051101

We search for the doubly charmed baryonic decay $\bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^-$, in a data sample of $520\times10^6$ $B{\bar B}$ events accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric e^+e^- collider. We find no significant signal and set an upper limit of ${\cal B}(\bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^-)<6.2\times10^{-5}$ at 90% confidence level. The result is significantly below a naive extrapolation from ${\cal B}(B^-\to\Xi_c^0\bar{\Lambda}_c^)$ assuming a simple Cabibbo-suppression factor of $|V_{cd}/V_{cs}|^2$. The small branching fraction could be attributed to a suppression due to the large momentum of the baryonic decay products, which has been observed in other charmed baryonic two-body B decays. trend observed in other charmed baryonic two-body B decays.

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