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WG4 Summary and Future Plans

WG4 Summary and Future Plans. The muon trio and more. B. Lee Roberts Department of Physics Boston University. roberts@bu.edu http://physics.bu.edu/roberts.html. Lepton Flavor Violation Muon MDM (g-2) chiral changing Muon EDM. The Muon Trio:. MEG. MECO. PRIME.

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WG4 Summary and Future Plans

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  1. WG4 Summary and Future Plans The muon trio and more B. Lee Roberts Department of Physics Boston University roberts@bu.edu http://physics.bu.edu/roberts.html B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  2. Lepton Flavor Violation Muon MDM (g-2) chiral changing Muon EDM The Muon Trio: B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  3. MEG MECO PRIME B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  4. Today with e+e- based theory: All E821 results were obtained with a “blind” analysis. world average B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  5. Electric and Magnetic Dipole Moments Transformation properties: An EDM implies both PandT are violated. An EDM at a measureable level would imply non-standard model CP. The baryon/antibaryon asymmetry in the universe, needs new sources of CP. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  6. Present EDM Limits *projected B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  7. General Statements • We know that n oscillate • neutral lepton flavor violation • Expect Charged lepton flavor violation at some level • enhanced if there is new dynamics at the TeV scale • in particular if there is SUSY • We expect CP in the lepton sector (EDMs as well as n oscillations) • possible connection with cosmology (leptogenesis) B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  8. The Physics Case: • Scenario 1 • LHC finds SUSY • MEG sees m→ e g • The trio will have SUSY enhancements • to understand the nature of the SUSY space we need to get all the information possible to understand the nature of this new theory B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  9. 10 -11 10 -13 10 -15 10 -17 10 -19 10 -21 SUSY predictions ofm-A  e-A From Barbieri,Hall, Hisano … Rme MECO single event sensitivity PRIME single event sensitivity 100 200 300 100 200 300 •  eg& m-A  e-ABranching Ratios are linearly correlated Complementary measurements(discrimination between SUSY models) B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  10. Experimental bound Connection with n oscillations Additional contributiontoslepton mixingfromV21, matrix element responsible for solar neutrino deficit. (J. Hisano & N. Nomura, Phys. Rev. D59 (1999) 116005). tan(b) = 30 tan(b) = 0 Largely favoured and confirmed by Kamland After Kamland MEG goal All solar n experiments combined B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  11. SUSY connection between am , Dμ, μ→ e B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  12. aμ sensitivity to SUSY (large tanb) B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  13. SUSY, dark matter, (g-2) DE821 CMSSM B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  14. DE969 = Dnow B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  15. DE969= 0 B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  16. The Physics Case • Scenario 2 • LHC finds Standard Model Higgs at a reasonable mass, nothing else, (g-2) discrepancy could be the only indication beyond neutrino mass of New Physics • Then precision measurements come to the forefront, since they are sensitive to heavier virtual particles. • μ-e conversion is especially sensitive to other new physics besides SUSY B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  17. Sensitivity to Various me Conversion Mechanisms Supersymmetry Compositeness Predictions at 10-15 Second Higgs doublet Heavy Neutrinos Heavy Z’, Anomalous Z coupling Leptoquarks After W. Marciano B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  18. The Experiments: LFV • μe conversion and Muonium-anti-Muonium conversion • pulsed beam • μ→ eg and eee • DC beam B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  19. Near Term Experiments on LFV • MEG @ PSI (under construction, data begins in 2006) • 10-13 BR sensitivity • MECO @BNL (funding not certain) • 10-17 BR sensitivity B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  20. MEG @ PSI (10-13 BR sensitivity) Discovery Potential: 4 Events BR = 2 X 10-13 B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  21. The MECO Apparatus Straw Tracker Muon Stopping Target Muon Beam Stop Superconducting Transport Solenoid (2.5 T – 2.1 T) Crystal Calorimeter Superconducting Detector Solenoid (2.0 T – 1.0 T) Superconducting Production Solenoid (5.0 T – 2.5 T) Collimators approved but not funded 10-17BR single event sensitivity p beam B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  22. Future Experiments on LFV • PRIME-type experiment • with FFAG muon storage ring • few X 10-19 • Such an experiment is perfect for the front end of a muon factory B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  23. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  24. m +e-→ m -e+ Full M search Muonium production B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  25. An improvement of 102 on GMM would confront these types of models which would also contribute to double b – decay. At the front end of a n factory with a pulsed beam this might be possible. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  26. Future Muon (g-2) Experiments • E969 @ BNL 0.5 → 0.20 ppm (scientific approval but not funded) • expected near-term improvement in theory, → the ability to confront the SM by ~ x 2 • The next generation 0.20 → 0.06 ppm • substantial R&D would be necessary • new ring or improved present ring? B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  27. Use an E field for vertical focusing 0 spin difference frequency = ws - wc B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  28. Muon (g-2): Store m ± in a storage ring magnetic field averaged over azumuth in the storage ring B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  29. E969: Systematic Error Goal • Field improvements will involve better trolley calibrations, better tracking of the field with time, temperature stability of room, improvements in the hardware • Precession improvements will involve new scraping scheme, lower thresholds, more complete digitization periods, better energy calibration B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  30. SM value dominated by hadronic issues: • Lowest order hadronic contribution ( ~ 60 ppm) • Hadronic light-by-light contribution ( ~ 1 ppm) The error on these two contributions will ultimately limit the interpretation of a more precise muon (g-2) measurement. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  31. A (g-2) experiment to ~0.06 ppm? • Makes sense if the theory can be improved to 0.1 ppm, which is hard, but maybe not impossible. • With the present storage ring, we already have B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  32. Where we came from: B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  33. Today with e+e- based theory: All E821 results were obtained with a “blind” analysis. world average B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  34. Muon EDM • Present limit ~10-19 e-cm • Could reach 10-24 to 10-25 at a high intensity muon source? B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  35. Spin Precession Frequencies: m in B field with both an MDM and EDM The motional E - field, β X B, is much stronger than laboratory electric fields . ~GV/m with no sparks! The EDM causes the spin to precess out of plane. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  36. EDM – up/down Asymmetry • avoid the magic γ and use a radial E-field to turn off (g-2) precession • Place detectors above and below the vacuum chamber and look for an up/down asymmetry which builds up with time B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  37. Up/Down asymmetry vs. time time B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  38. The EDM ring • run with both μ+ and μ-. • there must be regions of combined E+B along with separate focusing elements. • There needs to be a scheme to inject CW and CCW. Possible Muon EDM Ring Parameters B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  39. A possible lattice Yuri Orlov B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  40. NP2 • the figure of merit is Nμ times the polarization. • we need to reach the 10-24 e-cm level. Narrow pulsed beam every ~100 ms B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  41. Additional topics: • Muons for condensed matter (m SR) • Muon catalyzed fusion (m CF) • Muon lifetime (GF) • Muon capture (gp) • . . . B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  42. Depth dependent mSR measurements in near surface regions B(z) Superconductor l z 0 • Magnetic field profile B(z) over nm scale • Characteristic lengths of the sc l, x B(z) B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  43. k0 90 Magnetic Field Profile in YBa2Cu3O7-d • Direct, absolute measurement of magnetic penetration depth • effective mass • density of supercarriers • Direct test of theories (London, BCS) local response  exponential profile T.J. Jackson, T.M. Riseman, E.M. Forgan, H. Glückler, T. Prokscha, E. Morenzoni, M. Pleines, Ch. Niedermayer, G. Schatz, H. Luetkens, and J. Litterst, Phys. Rev. Lett. 84, 4958 (2000). B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  44. Beams needed: • Pulsed intense muon beams • energy from surface (28 MeV/c) to 3.1 Gev/c • A few experiments could used DC beam, but almost all can use the pulse structure of a pulse, and some ms with no beam B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  45. Beam requirements: A few examples B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  46. Plans for next year • LFV experiments will continue to develop the techniques needed for these challenging experiments • Muon EDM collaboration will continue to investigate the appropriate ring structure. • Participate in scoping study for n factory • At present muon physics is not mentioned in the document of 10 June 2005 B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

  47. Summary • The questions addressed are at the center of the field of particle physics • There is an important program of muon physics which will be possible at the front-end of a n factory. • It makes use of the very intense flux which will be available there • If such a muon facility exists, there will also be a program of other very interesting muon experiments which is possible. B. Lee Roberts, on behalf of the Intense Muon Physics Working Group

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