2007

Search for \bar{B}^0\to\Lambda_c^+\bar{\Lambda}_c^- decay at Belle

The Belle Collaboration, Abe, K.

Understand

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.

Built on

N. Cabibbo, Phys. Rev. Lett. 10
1963
Earlier work this paper cites.
M. Kobayashi and K. Maskawa, Prog. Theor. Phys. 49, 652 (1973)
1973
Earlier work this paper cites.
G. C. Fox and S. Wolfram, Phys. Rev. Lett. 41
1978
Earlier work this paper cites.
R. Brun et al
1984
Earlier work this paper cites.
M. Jarfi et al
1988
Earlier work this paper cites.
V. Chernyak and I. Zhitnisky, Nucl. Phys. B 345
1990
Earlier work this paper cites.
H. Albrecht et al
1990
Earlier work this paper cites.
Q. P. Xu and A. N. Kamal, Phys. Rev. D 46
1992
Earlier work this paper cites.
J. G. Körner and M. Kramer, Z. Phys. C 55
1992
Earlier work this paper cites.
H. -Y. Cheng and B. Tseng, Phys. Rev. D 48
1993
Earlier work this paper cites.

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1994
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1997
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2001
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2002
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S. A. Dytman et al
2002
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H. Y. Cheng and K. C. Yang, Phys. Rev. D 67
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For comparison of those data points, we normalize them to the absolute branching fraction ℬ ⁡ ( Λ c + → p K − π + ) = 5.0 % {\cal B}(\Lambda_{c}^{+}\to pK^{-}\pi^{+})=5.0\% . We calculate the errors for ℱ ⁡ ( Ξ c 0 Λ ¯ c − ) {\cal F}(\Xi_{c}^{0}\bar{\Lambda}_{c}^{-}) , ℱ ⁡ ( Σ c 0 p ¯ ) {\cal F}(\Sigma_{c}^{0}\bar{p}) , ℱ ⁡ ( Λ c + p ¯ ) {\cal F}(\Lambda_{c}^{+}\bar{p}) excluding the uncertainty from the Λ c + \Lambda_{c}^{+} absolute branching fraction as these modes decay to final states with one Λ c + \Lambda_{c}^{+} . On the other hand, we include the error for ℱ {\cal F} ( B ¯ 0 → Λ c + Λ ¯ c − \bar{B}^{0}\to\Lambda_{c}^{+}\bar{\Lambda}_{c}^{-} ) as it decays to two Λ c \Lambda_{c} ’s. The error in ℱ ⁡ ( Ξ c 0 Λ ¯ c − ) {\cal F}(\Xi_{c}^{0}\bar{\Lambda}_{c}^{-}) includes the theoretical uncertainty in ℬ {\cal B} ( Ξ c 0 → Ξ − π + \Xi_{c}^{0}\to\Xi^{-}\pi^{+} )=0.83-1.74% discussed above
Cited in the paper.

Then

S. Kurokawa and E. Kikutani, Nucl. Instr. and Meth. A 499
2003
Later among the works it cites.
H. Kichimi, Nucl. Phys. B Proc. Suppl. 142
2005
Later among the works it cites.
W.-M. Yao et al
2006
Later among the works it cites.
N. Gabyshev, H. Kichimi et al
2006
Later among the works it cites.
N. Gabyshev et al
2006
Later among the works it cites.
R. Chistov et al
2006
Later among the works it cites.
H. -Y. Cheng, C. -K. Chua and S. -Y. Tsai, Phys. Rev. D 73
2006
Later among the works it cites.
K. S. Park and H. Kichimi et al
2007
Closest in time.
Y. -T. Tsai et al
Original
2007
Closest in time.

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