Search for $\Lambda_c^+\to\phi p \pi^0$ and branching fraction measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$

We have searched for the Cabibbo-suppressed decay Λc+→ϕpπ0 in e+e- collisions using a data sample corresponding to an integrated luminosity of 915 fb-1. The data were collected by the Belle experiment at the KEKB e+e- asymmetric-energy collider running at or near the ϒ(4S) and ϒ(5S) resonances. No significant signal is observed, and we set an upper limit on the branching fraction of B(Λc+→ϕpπ0)<15.3×10-5 at 90% confidence level. The contribution of nonresonant Λc+→K+K-pπ0 decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be B(Λc+→K+K-pπ0)NR<6.3×10-5 at 90% confidence level. We also search for an intermediate hidden-strangeness pentaquark decay Ps+→ϕp. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of B(Λc+→Ps+π0)×B(Ps+→ϕp)<8.3×10-5 at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay Λc+→K-π+pπ0; the result is B(Λc+→K-π+pπ0)=(4.42±0.05(stat)±0.12(syst)±0.16(norm))%, which is the most precise measurement to date.

Note:

8 pages, 5 figures, 1 table, minor text change in version 2

electron positron: annihilation
electron positron: colliding beams
Lambda/c+: hadronic decay
Lambda/c+: rare decay
pentaquark: hadroproduction
pentaquark: hadronic decay
Lambda/c+: branching ratio: upper limit
Lambda/c+: branching ratio: measured
Upsilon(10870): electroproduction
Upsilon(10570): electroproduction

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Search for Λc+→ϕpπ0\Lambda_c^+\to\phi p \pi^0Λc+​→ϕpπ0 and branching fraction measurement of Λc+→K−π+pπ0\Lambda_c^+\to K^-\pi^+ p \pi^0Λc+​→K−π+pπ0

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Search for $\Lambda_c^+\to\phi p \pi^0$ and branching fraction measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$