Contents

# Contents

## Idea

In particle physics, what is called the $V_{cb}-puzzle$ (see GJS 19 for the status as of May 2019) is an observation about the decay of B-mesons (by the Belle collaboration and other experiments) which implies a value of the element $\left\vert V_{c b}\right\vert$ in the CKM matrix that differs from the apparent prediction of the standard model of particle physics with a statistical significance of about $3 \sigma$. But the form factors involved in this prediction suffer from theoretical uncertainties of quark contributions, and further lattice QCD-computation is expected to be required to clarify the actual prediction of the standard model of particle physics (GJS 19, last sentence).

The $V_{c b}$-puzzle is different from, but related to, the flavour anomalies (GJS 19 (6))

## References

• Paolo Gambino, Martin Jung, Stefan Schacht, The $V_{c b}$ puzzle: an update (arXiv:1905.08209)

Created on May 21, 2019 at 04:03:53. See the history of this page for a list of all contributions to it.