21-25 May 2018
Budker INP
Asia/Novosibirsk timezone

Measurement of the Decay $\Lambda_c \to \Sigma \pi \pi$ at Belle

25 May 2018, 15:38
17m
Budker INP

Budker INP

Lavrentiev av. 11, Novosibirsk 630090

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)

Presentation Materials