Abstract
The Mu2e experiment aims to measure the charged-lepton flavor violating neutrino-less conversion of a negative muon into an electron in the field of an aluminum nucleus. The objective is to improve the previous measurement by four orders of magnitude with the use of a similar technique. For the conversion process, the signal will appear as a mono-energetic electron very close to the muon rest mass. In the Standard Model these process have negligible rates. However, in many Beyond the Standard Model scenarios their rates are within the reach of next generation experiments. In this paper, we explain the sensitivity to new physics scale and the complementarity of approach and reach provided by MU2E with respect to Mu3e and MEG upgrade. Mu2e experimental technique, design and status will be the focus of this paper.
Highlights
In the Standard Model, SM, hadronic flavor transitions are allowed and the CKM matrix represents the probability for a quark of a specific family to turn into a different quark of another family
Flavor transitions between neutral leptons have been observed in neutrino oscillations that imply non conservation of lepton flavor number
Even assuming massive neutrinos, charged lepton flavor violation (CLFV) processes are extremely suppressed in the SM
Summary
In the Standard Model, SM, hadronic flavor transitions are allowed and the CKM matrix represents the probability for a quark of a specific family to turn into a different quark of another family. A model independent description of the CLFV transitions for physics beyond the Standard Model is provided by an effective lagrangian [6] where the different processes are divided in dipole amplitudes and four-fermion, or contact term, operators. The interpretation of an eventual direct observation of new physics at LHC will have to take into account precise measurements from MEG and Mu2e where the comparison between these determinations will provide the constraints necessary in pinning down the underlying theory. It is clear that while not excluding the Leptoquark existence at few TeV masses, the CLFV coverage extends up to masses of O( 100 TeV ) Another example is provided by the left-right. It is clear that the two experiments can cover the expectations for the full phase space of this theory and help constraining it
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