17–21 Jul 2023
Hörsaalzentrum Unteres Schloss
Europe/Berlin timezone

Charm-flavor-conserving weak decays of charmed baryons: A story that has lasted 30 years

20 Jul 2023, 17:10
20m
US-C 116 (Hörsaalzentrum Unteres Schloss)

US-C 116

Hörsaalzentrum Unteres Schloss

US-C, Kölner Str. 41, 57072 Siegen
contributed parallel talk decays Parallel A

Speaker

Hai Yang Cheng (Academia Sinica)

Description

Three decades ago, heavy-flavor-conserving (HFC) weak decays of heavy baryons such as $\Xi_Q\to\Lambda_Q\pi$ and $\Omega_Q\to\Xi_Q\pi$ for $Q=c,b$ had been studied
within the framework that incorporates both heavy-quark and chiral symmetries.
HFC decays have two great advantages: (1) S-wave can be evaluated reliably using current algebra, and (2) if the heavy quark in the HFC process behaves as a spectator, then the $P$-wave amplitude of $\Xi_Q\to\Lambda_Q\pi$ will vanish. In the b sector, HFC decay was first measured by LHCb in 2014 and it was well understood. However, HFC decay in the charm sector, namely, $\Xi_c\to\Lambda_c\pi$ was not measured until 2020. The theoretical prediction
of its branching fraction is too small compared to experiment. The puzzle was finally resolved recently. It takes thirty years to fully understand the underlying mechanism for charm-flavor-conserving weak decays of charmed baryons.

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Primary author

Hai Yang Cheng (Academia Sinica)

Co-authors

Dr Chia-Wei Liu (Hangzhou Institute for Advanced Study) Prof. Fanrong Xu (Jinan University)

Presentation materials