Speakers
Description
The Sigma+ -> p mu+ mu- decay is observed for the first time at the
LHCb experiment.
This is a flavour changing neutral current sensitive to physics beyond
the Standard Model, which could modify it's properties.
In particular the HyperCP experiment years ago presented an evidence of
this decay with a hint of a possible unknown intermediate particle.
This was excluded by LHCb already in 2018. This new measurement presents
a highly significant observation and a measurement of
its integrated and differential branching fraction. This is the rarest
baryon decay ever observed.
Additionally, the sensitivity of these observables to Chiral
Perturbation Theory parameters will be discussed.
Finally prospects for additional observables, such as a CP violation
measurement, will also be presented.