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02-2-1124-2015/2020
Priority:1
Status: Being concluded

Search for New Physics in Experiments with High-Intensity Muon Beams


Leader:     V.V. Glagolev
Deputy:     Yu.I. Davydov
Scientific leader:             J.A. Budagov


Participating countries and international organizations:
Belarus, Bulgaria, Czech Republic, Georgia, Germany, United Kingdom, France, Italy, Russia, Slovakia, Switzerland, USA, Ukraine, Japan.

Issues addressed and main goals of research:
The muon anomalous magnetic moment aµ can be measured and computed to a high precision. The comparison between experiment and the SM provides a sensitive search for New Physics (NP). At present, both measurement and theory have sub-part-per-million (ppm) uncertainties, and the "g-2 test" is being used to constrain SM extensions. The difference between experiment and theory, aµ(Expt-SM) = (255 ± 80) × 10 -11 (3.2 ), is a highly cited result and a possible harbinger of new TeV-scale physics. Potential explanations of the deviation include supersymmetry, lepton substructure, dark matter loop, etc., all well motivated by theory and consistent with other experimental constraints. The Fermilab experiment has a plan to reduce the experimental uncertainty by a factor of 4 or more. A precise g-2 test, no matter where the final value lands, will sharply discriminate among models and will enter as one of the central observables in a global analysis of any SM extensions.
    The Mu2e experiment at Fermilab and the MEG II experiment at PSI are a dedicated search for the CLFV processes µ - N e - N, µ + e +gamma. Once neutrinos masses are included, the process is allowed but still effectively absent since the rate is proportional to ( m 2ij/M 2W) 2 , where m 2ijMW is the mass of the W boson. The predicted rates for the µ -N e -N and µ + e +gamma 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.
    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:
  • Simulation for e.m. calorimeter calibration of the Mu2e experiment.

  • 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.

  • Maintenance of the final version 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.

  • 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 experiments
with high-intensity muon beams		 V.V. Glagolev 1   (2015-2020)

List of Activities
  Activity or Experiment Leaders
Status
      Laboratory or other
    Division of JINR
Responsible person		 Main researchers
1. Experiment Mu2e V.V. Glagolev
R&D
Realization
  DLNP A.M. Artikov,  N.V. Atanov,  O.S. Atanova,  N.S. Azaryan,  V.Yu. Baranov,  V.Yu. Batusov,  J.A. Budagov,  D.Sh. Chokheli,  Yu.I. Davydov,  D.L. Demin,  A.V. Guskov,  Yu.N. Kharzheev,  V.I. Kolomoets,  S.M. Kolomoets,  Yu.A. Koultchitski,  M.V. Lyablin,  V.M. Romanov,  A.V. Sazonova,  A.N. Shalóugin,  A.V. Simonenko,  S.N. Studenov,  I.A. Suslov,  I.V. Titkova,  V.V. Tereschenko,  S.V. Tereschenko,  Z.U. Usubov,  I.K. Zimin
  BLTP D.I. Kazakov, G.A. Kozlov, O.V. Tarasov
  LIT V.V. Korenkov, V.V. Uzhinsky
  VBLHEP A.S. Galoyan
2. Experiment Muon g-2 N.V. Khomutov
R&D
Realization
  DLNP V.A. Baranov, V.N. Duginov, N.A. Kuchinsky, N.P. Kravchuk,  A.I. Rudenko,  V.P. Volnykh
  VBLHE S.A. Movchan
  LRB V.A. Krylov
3. Experiment MEG II N.V. Khomutov
R&D
Realization
  DLNP V.A. Baranov, V.V. Glagolev, Yu.I. Davydov, N.A. Kuchinsky,  N.P. Kravchuk,  A.V. Krasnoperov,  V.L. Malyshev,  A.M. Rozhdestvensky,  A.V. Simonenko,  I.V. Titkova
  VBLHEP A.O. Kolesnikov
  LRB V.A. Krylov
4. Experiment PEN N.A. Kuchinsky
Data processing
  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. V. Krasnoperov, V.V. Lyubushkin, 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
Data analysis
  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 INP BSU
Bulgaria Sofia SU
Georgia Tbilisi HEPI-TSU
Italy Frascati INFN LNF
Pisa UniPi
Russia Moscow, Troitsk INR RAS
Gatchina NRC KI PNPI
Romania Bucharest IFIN-HH
Slovakia Bratislava CU
IP SAS
Switzerland Villigen PSI
Ukraine Kharkov ISMA NASU
USA Batavia, IL Fermilab
Charlottesville, VA UVa
Lexington, KY UK
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