Speaker
Mr
Manfred Berger
(Stefan-Meyer-Institute, Austrian Academy of Sciences)
Description
Recent model-independent measurements of the absolute branching ratio of the normalization mode $\Lambda_c -> p^+ K^- \pi^+$ by the Belle$^1$ and BES3$^2$ collaborations have significantly increased the precision of previously measured decay channels. BES3 also independently updated the value for the $\Lambda^+_c \to\Sigma^+ \pi^- \pi^+$ mode, however the branching fraction into the $\Lambda^+_c \to\Sigma^0 \pi^0 \pi^+$ decay channel has not been improved upon since the measurement by the CLEO$^3$ collaboration.
We report new measurements of the branching fractions of the decays $\Lambda^+_c \to \Sigma^+ \pi^- \pi^+$, $\Sigma^0 \pi^0 \pi^+$ and $\Sigma^+ \pi^0 \pi^0$ based on 711 fb$^{-1}$ of integrated luminosity recorded with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider near the $\Upsilon(4S)$ resonance (charge conjugated decays are implicitly included). All results are obtained relative to $\Lambda^+_c\to pK^-\pi^+$. This is the first measurement of the $\Lambda^+_c -> \Sigma^+ \pi^0 \pi^0$ channel. The measurements of the other modes are significantly more precise compared to previous analyses and of similar precision to the recent BES3 results.
1 A. Heller et al. (Belle Collaboration) Phys. Rev. D 91, 112009 (2014)
2 M. Ablikim et al. (BESIII Collaboration) Phys. Rev. Lett. 116, 052001 (2015)
3 P. Avery et al. (CLEO Collaboration) Physics Letters B, Volume 325, Issue 1 (1994)
Primary authors
Dr
Christoph Schwanda
(Hephy, Austrian Academy of Sciences)
Dr
Ken Suzuki
(Stefan-Meyer-Institute)
Mr
Manfred Berger
(Stefan-Meyer-Institute, Austrian Academy of Sciences)
