|
|
|
Search
for New Physics in the Charged Lepton Sector
Leaders: |
V.V. Glagolev
Z. Tsamalaidze
|
Deputies:
|
Yu.I.
Davydov
N.V. Khomutov
|
Scientific
leader:
|
J.A.
Budagov
|
Participating
countries and international organizations:
Belarus,
Bulgaria, Czech Republic, France, Georgia, Germany, Italy, Japan,
Kazakhstan, Russia, Slovakia, Switzerland, Ukraine, United
Kingdom, USA.
Issues
addressed and main goals of research:
The
Mu2e experiment at Fermilab, COMET experiment at J-PARC and the MEG
II experiment at PSI are a dedicated search for the CLFV processes
µ
-
N
→
e
-
N
,
µ+
→
e
+
γ
.
Once neutrinos masses are included, the process is allowed but still
effectively absent since the rate is proportional to
(
Δ
m 2ij/M 2W) 2,
where Δ
m 2ij is
the mass difference squared between ith and jth neutrino mass
eigenstates, and MW is
the mass of the W boson.
The
predicted rates for the µ
-
N
→
e
-
N
and
µ +
→
e +
γ
CLFV
processes are less than 10 -50 each.
This makes this process a very theoretically clean place to search
for NP effects. In many NP models that include a description of
neutrino mass, the rates for these processes are enormously enhanced
so that they occur at a level to which Mu2e experiment will have
sensitivity. Conversion measurement at the level of 10 -17,
which is the COMET goal, is a factor of 10000 better than the current
experimental limit B(µ -+
Au→
µ
e - +
Au) < 7·10 -13 from
SINDRUM-II at PSI.
Participation
in the creation and tests of the theoretical views in the topics.
Study of CP-violation in the lepton sector with the help of
neutrinos. Study of hyperfine interactions of an acceptor impurity in
semiconductors with the aid of negative muons. Investigation of the
behavior of positive muons in systems with magnetic nanoparticles.
Expected
results in the current year:
Tests
of the CsI and BaF2 e.m.
calorimeter elements with the gamma sources and electron beam.
Participation
in the construction and tests of modules of scintillator counters
for the veto system. Quality
control.
Filling
the batch of Mu2e scintillation counters with CKIN and testing them
for leakage.
Maintenance
of the visualization and control software.
Development
and tests of the Mu2e e.m. calorimeter preamplifiers at JINR.
Participation
in the radiation hardness tests of the detector elements.
Рarticipation
in the creation of an active scintillation target of a new type with
a volume of about 2 cubic meters for the T2K experiment.
R&D
of thin-wall straw tubes for COMET. Development, production and
tests of the straw detector and electromagnetic calorimeter
prototype.
Calibration
of LYSO crystals.
R&D
of muon veto system elements.
Analysis
of the experimental data on the radiative pion decay collected by
the PEN experiment.
Participation
in the development of the positron tracker for the MEG-II
experiment, DAQ, data ana-lysis.
Participation
in the data taking and analysis of experimental data obtained with
CERN hadron beams.
Software
development for data processing and analysis.
Study
of the behavior of magnetic nanoparticles with high magnetic
anisotropy by the muon spin ro-tation technique.
Data
analysis of the p+t synthesis
using the muon catalysis method.
List
of projects:
|
|
|
Project
|
Leader
|
Priority
(period
of realisation)
|
1.
|
Search
for new physics in the
charged lepton sector
|
V.V.
Glagolev
Z. Tsamalaidze
|
1
(2021-2021)
|
List
of Activities:
|
|
|
Activity
or Experiment
|
Leaders
|
Status
|
|
Laboratory
or other
Division of JINR
Responsible
person
|
Main
researchers
|
1.
|
Experiment
Mu2e
|
V.V.
Glagolev
|
|
|
DLNP
|
A.M.
Artikov, N.V. Atanov, O.S. Atanova, V.Yu. Baranov, J.A. Budagov,
Yu.I. Davydov, D.L. Demin, Yu.N. Kharzheev, V.I. Kolomoets,
S.M. Kolomoets, A.V. Sazonova, A.N. Shalóugin, A.V.
Simonenko, I.A. Suslov, V.V. Tereschenko, S.V. Tereschenko, Z.U.
Usubov
|
|
BLTP
|
D.I.
Kazakov, G.A. Kozlov
|
|
LIT
|
V.V.
Korenkov, O.V. Tarasov, V.V. Uzhinsky
|
|
VBLHEP
|
A.S.
Galoyan
|
2.
|
Experiment
COMET
|
Z.
Tsamalaidze
|
|
|
DLNP
|
G.
Adamov, D.Sh. Chokheli, V.N. Duginov, P.G. Evtukhovich,
I.L.
Evtukhovich, K.I. Gritsai, V.A. Kalinnikov, Kh. Khubashvili,
A.
Kobey, E.S. Kaneva, A.S. Moiseenko, A.V. Pavlov, B.M. Sabirov,
A.G. Samartsev, N. Tsverava, E.P. Velicheva, A.D. Volkov
|
|
|
LIT
|
D.
Goderidze, Yu.L. Kalinovsky, A. Khvedelidze
|
|
BLTP
|
D.
Aznabaev, A. Issadykov, G.A. Kozlov
|
|
VBLHEP
|
D.
Baigarashev, V.V. Elsha, T.L. Enik, S.A. Movchan,
S.N.
Shkarovsky
|
3.
|
Experiment
MEG II
|
N.V.
Khomutov
|
|
|
DLNP
|
V.A.
Baranov, V.V. Glagolev, Yu.I. Davydov, N.A. Kuchinsky,
N.P. Kravchuk,
V.L. Malyshev, A.M. Rozhdestvensky, A.O. Kolesnikov,
V.A. Krylov
|
4.
|
Experiment
PEN
|
N.A.
Kuchinsky
|
|
|
DLNP
|
V.A.
Baranov, N.V. Khomutov, S.M. Korenchenko, A.S. Khrykin, E.S.
Kuzmin, A.M. Rozhdestvensky, E.P. Velicheva, V.P. Volnykh
|
|
BLTP
|
Yu.M.
Bystritsky
|
5.
|
CERN
Neutrino platform
|
B.A.
Popov
|
Data
taking
Data processing
|
|
|
|
DLNP
|
N.V.
Atanov,
A.O. Kolesnikov, A.V.
Krasnoperov,
V.V.
Lyubushkin,
V.L. Malyshev, S.V.
Tereschenko,
V.V.
Tereschenko
|
6.
|
Experiment
MUSPIN
|
V.N.
Duginov
|
Data
taking
Data analysis
|
|
|
|
DLNP
|
E.I.
Bunyatova, K.I. Gritsay, A.I. Rudenko, G.D. Soboleva
|
|
FLNP
|
M.
Balasoiu + 2 pers.
|
7.
|
Experiment
TRITON
|
D.L.
Demin
|
|
|
DLNP
|
N.A.
Baranova, A.I. Boguslavsky, V.N. Duginov, E.D. Gorodnichev, K.I.
Gritsay, S.A. Gustov, V.I. Kolomoets, E.V. Kolesov, A.D. Konin,
A.P. Kustov, A.I. Rudenko, Yu.A. Polyakov, N.A. Shakun,
V.I. Smirnov,
Z.U. Usubov
|
|
FLNR
|
S.A.
Yukhimchuk
|
|
LRB
|
V.B.
Buchnev, V.Yu. Schegolev
|
Collaboration
Country
or International Organization
|
City
|
Institute
or laboratory
|
| |
▲ |
Belarus
|
Minsk
|
BSU
|
|
|
INP
BSU
|
|
|
IP
NASB
|
Bulgaria
|
Sofia
|
SU
|
Czech
Republic
|
Prague
|
CTU
|
|
|
CU
|
France
|
Paris
|
IN2P3
|
Georgia
|
Tbilisi
|
GTU
|
|
|
HEPI-TSU
|
|
|
UG
|
Italy
|
Frascati
|
INFN
LNF
|
|
Pisa
|
UniPi
|
Japan
|
Fukuoka
|
Kyushu
Univ.
|
|
Osaka
|
Osaka
Univ.
|
|
Tsukuba
|
KEK
|
Kazakhstan
|
Almaty
|
INP
|
Romania
|
Bucharest
|
IFIN-HH
|
Russia
|
Gatchina
|
NRC
KI PNPI
|
|
Irkutsk
|
ISU
|
|
Moscow
|
ITEP
|
|
|
NNRU
"MEPhI"
|
|
Moscow,
Troitsk
|
INR
RAS
|
|
Novosibirsk
|
BINP
SB RAS
|
|
|
NSU
|
Slovakia
|
Bratislava
|
CU
|
|
|
IP
SAS
|
Switzerland
|
Villigen
|
PSI
|
Ukraine
|
Kharkov
|
ISMA
NASU
|
United
Kingdom
|
Didcot
|
RAL
|
|
London
|
Imperial
College
|
USA
|
Batavia,
IL
|
Fermilab
|
|
Charlottesville,
VA
|
UVa
|
|
Lexington,
KY
|
UK
|
| |
▲ |
|