Conveners
WG4: Muon physics: Muon cLFV
- Craig Group (University of Virginia)
WG4: Muon physics: Muon cLFV
- MyeongJae Lee (Institute for Basic Science, Korea)
WG4: Muon physics: Lepton cLFV and hadron cLFV
- MyeongJae Lee (Institute for Basic Science, Korea)
WG4: Muon physics: Precision physics
- Angela Papa (PSI)
WG4: Muon physics: Lepton and hadron cLFV - Muonium
- Craig Group (University of Virginia)
WG4: Muon physics: Muon theoretical session
- Angela Papa (PSI)
Dr
Cecilia Voena
(INFN Roma)
25/09/2017, 14:00
Working Group 4: Muon Physics
talk
The MEG experiment took data at the Paul Scherrer Institut in the years 2009-2013
and published the most stringent limit on the charged lepton flavor violating decay
$\mu \rightarrow e \gamma$: BR($\mu \rightarrow e \gamma$) $<4.2 \times 10^{-13}$ $@90\%$ C.L.
The MEG detector is currently being upgraded in order to reach a sensitivity of $\sim 4 \times 10^{-14}$,
which corresponds to...
Ms
Ann-Kathrin Perrevoort
(Physics Institute, Heidelberg University)
25/09/2017, 14:24
Working Group 4: Muon Physics
talk
The upcoming Mu3e experiment searches for the lepton-flavour violating decay $\mu^+\rightarrow e^+e^-e^+$ with the aim of a final sensitivity of one signal decay in $10^{16}$ observed muon decays, an improvement over the preceding SINDRUM experiment of four orders of magnitude. In the first phase, the experiment will be operated at an existing intense muon beam line at the Paul-Scherrer...
Prof.
E. Craig Dukes
(University of Virginia)
25/09/2017, 14:48
Working Group 4: Muon Physics
talk
The Mu2e collaboration proposes to 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 existing limits. Such a lepton flavor-violating reaction probes new physics at a scale unavailable by direct searches at either present or planned high energy
colliders. The physics motivation for Mu2e...
Dr
MyeongJae Lee
(Institute for Basic Science, Korea)
25/09/2017, 15:12
Working Group 4: Muon Physics
talk
COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of a nucleus ($\mu$+N$\to$e+N); a lepton flavor violating process. The experimental sensitivity goal for this process is of order 10$^{-15}$ for Phase-I and 10$^{-17}$ for Phase-II experiment, which is a factor of 100
to 10,000 improvements correspondingly over existing...
Dr
Jaroslaw Pasternak
(Imperial College London/ISIS-RAL-STFC)
25/09/2017, 15:36
Working Group 4: Muon Physics
talk
To maximise discovery potentials of next generation lepton flavour violation experiments high intensity and high quality muon beams are required. Such beams can be produced by sending a short, high intensity proton pulse to the pion production target, capturing pions and collecting the resulting muons in the large acceptance transport system. By applying the RF phase rotation on the muon beam...
Ms
Natsuki TESHIMA
(Osaka City University)
26/09/2017, 11:00
Working Group 4: Muon Physics
talk
The DeeMe experiment is planned at J-PARC Materials and Life Science Experimental Facility (MLF). The experiment aims to search for the muon to electron conversion in the nuclear field, which is one of the charged lepton flavor violation (cLFV) processes. While the processes are forbidden in the Standard Model (SM) of particle interactions, some theories beyond the SM predict the existence of...
Dr
Masato Yamanaka
(Maskawa Institute)
26/09/2017, 11:22
Working Group 4: Muon Physics
talk
We revisit charged lepton flavor violating (CLFV) scattering processes $\ell_{i} N \to \tau X \, (\ell_{i} \ni e, \mu)$ mediated by Higgs. We point out that a new subprocess $\ell_{i} g \to \tau g$ via the effective interactions of Higgs and gluon gives the dominant contribution to $\ell_{i} N \to \tau X$ for an incident beam energy of $E_{\ell} < 1\,\text{TeV}$ in fixed target experiments....
Dr
Dai Tomono
(Osaka University)
26/09/2017, 11:45
Working Group 4: Muon Physics
talk
A new DC muon beamline, MuSIC (MUon Science Innovative muon beam Channel) was constructed at Research Center for Nuclear Physics (RCNP), Osaka University. The MuSIC is a versatile beamline for various experiments in a fundamental physics and a muon applied science. This beamline provides intense positive and negative muon beams from 28 to 110 MeV/c. It is designed to provide an intense muon...
Antonino Sergi
(Uni Birmingham)
26/09/2017, 12:08
Working Group 4: Muon Physics
The NA62 experiment at CERN collected a large sample of charged kaon decays in flight with a minimum bias trigger in 2007, and with an improved setup in 2015-16.
Upper limits on the rate of the charged kaon decay into a muon and a heavy neutral lepton (HNL) obtained from 2007 data and limits
for electron and heavy neutral lepton obtained with 2015-16 data, are reported for a range of HNL masses.
Geert Jan Besjes
26/09/2017, 14:00
Working Group 4: Muon Physics
talk
Lepton flavor violation (LVF) is a striking signature of potential beyond
the Standard Model physics. The search for LFV with the ATLAS detector is
reported in searches focusing on the decay of the Higgs boson, the Z boson and of a
heavy neutral gauge boson, Z', using pp collisions data with a center of
mass energy of 8 TeV and 13 TeV.
Prof.
Barbara Clerbaux
(ULB)
26/09/2017, 14:30
Working Group 4: Muon Physics
talk
In the standard model (SM), charged lepton flavour violation (LFV) induced by neutrino oscillations is extremely suppressed. However extensions of the SM may enhance LFV processes to levels observable at the LHC. The talk will present the latest results on searches for heavy neutrinos and charged LFV processes performed by the CMS experiment at the CERN LHC collider. The searches are based on...
Preema Rennee Pais
26/09/2017, 15:00
Working Group 4: Muon Physics
talk
In the Standard Model, the three charged leptons are identical copies of each other, apart from mass differences. Experimental tests of this feature in decays of b hadrons are highly sensitive to New Physics particles which preferentially couple to the 2nd and 3rd generations of leptons. This talk will review the latest lepton universality tests at LHCb in both charged-current and...
Dr
Jenny Holzbauer
(University of Mississippi)
27/09/2017, 11:30
Working Group 4: Muon Physics
talk
The Muon g-2 Experiment at Fermilab will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the muons electric dipole moment (EDM) by approximately two orders of magnitude. Both of these measurements are made by...
Dr
Katsuhiko Ishida
(RIKEN)
27/09/2017, 12:00
Working Group 4: Muon Physics
talk
A new measurement of muon g-2/EDM is planned at J-PARC. The most recent measurement performed at BNL shows more than three standard deviations discrepancy with the standard model value. New E34 measurement at J-PARC uses a novel technique of ultra-cold muon beam. Ultra-cold muons are generated from high intensity surface muons by thermal muonium production and laser ionization. After...
Dr
Dmitri LIVENTSEV
(Virginia Polytechnic Institute and State University)
28/09/2017, 14:00
Working Group 4: Muon Physics
talk
The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK ``B factory'' facility in Tsukuba, Japan. The machine is designed for an instantaneous luminosity of 8x10^35 cm^-2s^-1, and the experiment is expected to accumulate a data sample of about 50 ab^-1 in five years of running. With this amount of data, decays sensitive to physics beyond the Standard Model and cLFV can...
Mr
Xiaoshen Kang
(Nankai University)
28/09/2017, 14:24
Mr
Shun Seo
(The University of Tokyo)
28/09/2017, 14:48
Working Group 4: Muon Physics
talk
Muonium is the bound state of a positive muon and an electron. Muonium is free from the finite-size effect of nucleons, thus the theoretical value of muonium hyperfine splitting (MuHFS) can be detemined precisely. MuSEUM (Muonium Spectroscopy Experiment Using Microwave) aims ten-fold improvement of the preceding measurement of the experimental value of MuHFS in the ground state both in zero...
Toya Tanaka
(University of Tokyo)
28/09/2017, 15:12
Working Group 4: Muon Physics
talk
Muonium is a hydrogen-like atom formed by a positive muon and an electron. The measurement of muonium hyperfine structure (MuHFS) at ground state is a good probe to test the theory of the bound state quantum electrodynamics (QED). Moreover, from the MuHFS measurement with high magnetic field, the muon-to-proton magnetic moment ratio and mass ratio are also derived. As the muon-to-proton...
Dr
Sohtaro Kanda
(RIKEN)
28/09/2017, 15:36
Working Group 4: Muon Physics
talk
The proton is a fundamental constituent of the world. However, its internal structure has not been fully understood because of the complicity and difficulties in both theory and experiment. In 2010, a significant discrepancy between two independent measurements of the proton charge radius was reported. This conflict is known as "proton radius puzzle". Even though various interpretations have...
Giovanni Marco Pruna
29/09/2017, 11:30
Working Group 4: Muon Physics
talk
This talk reviews recent theoretical developments in the study of charged lepton flavour violation. It describes the recent progress in the effective field theory interpretation of charged lepton-flavour violating observables in connection with different energy scales by exploiting the SMEFT framework. A systematic approach is briefly presented and applications on muonic and tauonic...
Mr
Yannick Ulrich
(Paul Scherrer Institut / Universität Zürich)
29/09/2017, 11:50
Working Group 4: Muon Physics
talk
We present a general purpose Monte Carlo program for the calculation of the radiative ($\mu\to\nu\bar\nu e+\gamma$) and rare ($\mu\to\nu\bar\nu e+e^+e^-$) muon decays at NLO in the effective Fermi theory. These processes are irreducible Standard Model backgrounds to searches for lepton flavour violation at the PSI experiments MEG and Mu3e as they become indistinguishable from the corresponding...
Joe Sato
(Saitama University)
29/09/2017, 12:10
Working Group 4: Muon Physics
talk
We propose a new process of μ− e− → e− e− in a muonic atom for a quest of charged lepton flavor violation. The Coulomb attraction from the nucleus in a heavy muonic atom leads to significant enhancement in its rate, compared to μ+ e− → e+ e−. The search for this process could serve complementarily with the other relevant
processes to shed light upon the nature of charged lepton flavor...
