The standard model of particle physics is far from accounting for mysteries about our universe, --e.g., what is origin of neutrino masses and their hierarchy? Why is there so little antimatter in this world? etc. -- and it must be extended to a more fundamental description of nature. Such new physics models allow Charged Lepton Flavor Violating (CLFV) reactions which are exactly forbidden in...
Charged lepton flavor violating (CLFV) is one of the powerful tools to search for the physics beyond the Standard Model. The COMET experiment will search for the CLFV process μ− + N(Z, A) → e− + N(Z,A) in Al with single event sensitivity of 10-15 at Phase-I and 10-17 at Phase-II, which is two orders and four orders of magnitude respectively improvement on the current upper limited set by...
We propose a new charged lepton flavor violating (CLFV) process: the decay of true muonium $(\mu^+ \mu^-)$ into a lepton pair of different flavors, $\mu^\pm e^\mp$. This purely leptonic, hadron-free process provides a clean signature and enables the probing of both photonic dipole and four-fermion CLFV interactions. Since CLFV mediators indirectly appear in most CLFV processes, it is important...
The Belle and Belle II experiments have collected a 1.2 ab$^{-1}$ sample of $e^+e^- \to B\bar B$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare electroweak penguin $B$ decays and lepton-flavour-violating decays to final states...
In quantum field theory, the magnetic moment of a charged spin-$\frac{1}{2}$ particle such as the muon deviates slightly from the Dirac value of 2 due to quantum loop corrections involving virtual particles. This deviation, known as the anomalous magnetic moment, $a = (g - 2)/2$, is sensitive to all quantum effects, including potential contributions from particles beyond the Standard Model...
