Conveners
Parallel IV: Precision Experiments
- Tzu-Chiang Yuan (Academia Sinica)
Parallel IV: Precision Experiments
- Tzu-Chiang Yuan (Academia Sinica)
Parallel IV: Precision/collider joint session
- Giovanni Punzi (Universita di Pisa & INFN (IT))
The charged lepton flavor violating (CLFV) processes of $\mu^-e^-\rightarrow e^-e^-$ decay by four Fermi contact interactions in a muonic atom for various atoms are investigated. The wave functions of bound and scattering state leptons are properly treated by solving Dirac equations with Coulomb interaction of the finite nuclear charge distributions. This new effect contributes significantly...
The Mu2e Experiment at Fermilab will search for coherent, neutrinoless conversion of muons into electrons in the field of a nucleus with a sensitivity improvement of a factor of 10,000 over previous experiments. Such a charged lepton flavor-violating reaction probes new physics at a scale inaccessible with direct searches at either present or planned high energy colliders. The experiment both...
DeeMe is an experiment which aims to find a clear evidence of the existence of the new physics beyond the standard model by searching for one of the lepton flavor violating reactions, mu-e conversion at J-PARC MLF. The details of the experiment is presented in this talk.
The COMET experiment intends to search for the lepton flavor-violating conversion of a muon to electron while in the orbit of an atomic nucleus. The process is not forbidden by any symmetry of the Standard Model, but remains extremely suppressed even when flavor-mixing neutrino masses are introduced, due to the relative smallness of these masses. Because this suppression is accidental in the...
The muon anomalous magnetic moment is a fundamental quantity that has played an important role in the development of the Standard Model.It can be both measured and computed to very high precision, providing a sharp tool in testing the robustness of the SM and predictions by the theories of BSM physics. The previous measurement by the Brookhaven E821 experiment found a 3.6 standard deviation...
We perform an updated analysis for the one-loop induced lepton flavor violating radiative decays $l_i \to l_j \gamma$ in an extended mirror model. Mixing effects of the neutrinos and charged leptons constructed with a horizontal $A_4$ symmetry are also taken into account. Current experimental limit and projected sensitivity on the branching ratio of $\mu \to e \gamma$ are used to constrain...
Within the framework of the Electroweak-scale right-handed neutrino (EW-$\nu_R$) model, we calculate the rate for $\mu \to e$ conversion with a particular aim at the sensitivities
of the upcoming experiments, Mu2e ($6 \times 10^{-17}$) and COMET ($3 \times 10^{-17}$). Our calculations show a direct relationship between the rate for $\mu \to e$ conversion and that for $\mu \rightarrow e...
In this report, we study lepton flavor violation in some typical scenarios of minimal lepton flavor violation (MLFV). We introduce briefly the MLFV models in the three following scenarios: i, the Standard Model (SM) field content basing on lepton flavor group $G_{LF}=SU(3)_L\times SU(3)_{E_R}$; the see-saw type I field contents with three heavy right-handed neutrinos, and the lepton flavor...
We report on the latest searches for low mass states predicted in several New Physics models performed with the data collected by the BaBar detector at the PEP-II e+e- collider. In particular we search for a new muonic dark force mediated by a gauge boson (Z') coupling only to the second and third lepton families. The existence of the Z' boson is probed in e+e- -> mu+mu- Z', Z’ -> mu+ mu-...
Flavour changing neutral current processes, such as B -> K(*)l+l- where l = e+, mu+, tau+ are highly suppressed in the Standard Model (SM). These rare decays occur at lowest order via 1-loop diagrams, and contributions from virtual particles in the loop allow one to probe large mass scales at relatively low energies. We present here the most recent results based on the full BABAR data...
The NA62 experiment at CERN SPS collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007 using the experimental setup of the earlier kaon experiment at CERN NA48/2. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the...
