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Muon g-2 and EDM Experiments in Storage Rings: Sensitive Probes of Physics Beyond the SM

Muon g-2 and EDM Experiments in Storage Rings: Sensitive Probes of Physics Beyond the SM

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Muon g-2 and EDM Experiments in Storage Rings: Sensitive Probes of Physics Beyond the SM

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  1. SUNY-Stony Brook 10 February 2004 Muon g-2 and EDM Experiments in Storage Rings: Sensitive Probes of Physics Beyond the SM Yannis K. Semertzidis Brookhaven National Lab “Muon g-2 Collaboration” and “EDM in Storage Rings Collaboration”

  2. Muon g-2 Collaboration † # † †Spokesperson ‡Project Manager # Resident Spokesperson

  3. Prof. Vernon W. Hughes (1921  2003)

  4. Largest contribution : QED hadronic weak g - 2 for the muon Other standard model contributions :

  5. Theory of aµ • aµ(theo) = aµ(QED)+aµ(had)+aµ(weak) • + aµ(new physics) • aµ(had) = aµ(had1) + aµ(had, HO) + aµ(had, LBL) • ? -100.6 + 8.6 3.5 • in units of 10-10

  6. Cannot be calculated from pQCD alone because it involves low energy scales. However, by dispersion theory, this a(had1) can be related to measured in e+e- collisions. or τ decay. Hadronic contribution (had1)

  7. Cannot be calculated from pQCD alone because it involves low energy scales. However, by dispersion theory, this a(had1) can be related to measured in e+e- collisions or τ decay (assuming CVC). Hadronic contribution (had1)

  8. Evaluation of R M. Davier et al., hep-ph/0208177.v3

  9. Evaluation of R M. Davier et al., hep-ph/0208177.v3

  10. Difference between e+e- and  M. Davier et al., hep-ph/0208177.v3

  11. …Difference between e+e- and  M. Davier et al., Eur. Phys. J. C31, 503 (2003)

  12. M. Davier, hep-ph/0312065 Why? • aμ(had1,e+e-)=(696.3±7.)×10-10 • aμ(had1,τ) =(711.0±6.)×10-10 e+e- based τ based Correct Correctτ-data interpr. wrong Correct Wrong Wrong* Correct Wrong* Wrong T. Blum, hep-lat/0212018 *Other (e+e-) collaborations are looking into it see, e.g., the KLOE Collaboration, hep-ex/0210013 • aμ(exp)- aμ(SM, e+e-)=33.7(11)×10-10 • aμ(exp) -aμ(SM, τ) = 9.4(11)×10-10

  13. M. Davier, hep-ph/0312065 • aμ(had1,e+e-)=(696.3±7.)×10-10 • aμ(had1,τ) =(711.0±6.)×10-10 e+e- based τ based Correct Correctτ-data interpr. wrong Correct Wrong Wrong* Correct Wrong* Wrong *Other (e+e-) collaborations are looking into it, e.g., the KLOE Collaboration is about to announce their result. • aμ(exp)- aμ(SM, e+e-) 10 * *e+e-0 +-, whereas τ-- -0, S.G., F.J., hep-ph/0310181

  14. Theory of aµ • aµ(theo) = aµ(QED)+aµ(had)+aµ(weak) • + aµ(new physics) • aµ(QED) = 11 658 470.6 (0.3) ×10-10 • aµ(had) = 694.9 (8.) ×10-10 (based on e+e-) • aµ(had) = 709.6 (7.) ×10-10 (based on ) • aµ(weak) = 15.4 (0.3) ×10-10 • aµ(SM) = 11 659 181(8)×10-10 (based on e+e-) • aµ(SM) = 11 659 196(7)×10-10 (based on )

  15. Theory and Experiment vs. Year

  16. Experimental Principle

  17. The Muon Storage Ring: B ≈ 1.45T, Pμ≈3.09 GeV/c • Inner Ring of Detectors • High Proton Intensity from AGS • Muon Injection

  18. Spin Precession in g-2 Ring(Top View) Momentum vector m Spin vector

  19. Spin Precession in g-2 Ring(Top View) Momentum vector m Spin vector

  20. 4 Billion e+ with E>2GeV

  21. 5-parameter Function Not Quite Adequate. Fourier Spectrum of the Residuals: fg-2 ≈229 KHz fcbo≈466 KHz Data of 2000, n = 0.137

  22. Modulation of N0, A, with fcbo: Amplitudes of AN, AA, A, Consistent with Values from MC Simulations (10-2, 10-3, 10-3 respectively)

  23. 2001 Run with Negative Muons • In 2001 we have collected 3.7 Billion electrons with E>1.8GeV from a run with negative muons (μ-). Run at n=0.122 and n=0.142.

  24. Vertical vs. Horizontal Tune

  25. Systematic/Statistical Uncertainties for the ωa Analysis. Size [ppm] Systematic Uncertainties 2001 2000 Coherent Betatron Oscillations (CBO) Pileup (Overlapping Signals) Gain Changes Lost Muons Others Total Systematics 0.07 0.08 0.12 0.09 0.11 0.21 0.66 0.21 0.13 0.12 0.10 0.08 0.31 0.62 Statistical Uncertainty Total Uncertainty: 0.7 0.7

  26. Magnetic Field measurement The B field azimuthal variation at the center of the storage region. <B>1.45 T The B field averaged over azimuth.

  27. Magnetic Field Measurement Systematic Uncertainties for the ωp Analysis. Size [ppm] Source of Errors 2001 2000 0.05 0.09 0.05 0.07 0.03 0.10 0.17 0.05 0.15 0.10 0.10 0.03 0.10 0.24 Absolute Calibration of Standard Probe Calibration of Trolley Probe Trolley Measurements of B-field Interpolation with Fixed Probes Uncertainty from Muon Distribution Others Total

  28. Computation of aμ: • Analyses of ωa and ωp are Separate and Independent (“Blind Analysis”). When Ready, only then, Offsets are Removed and aμ is Computed.

  29. Computation of aμ: Data of 2001:aμ(exp)=11 659 214(8)(3)×10-10 (0.7 ppm) W.L. et al., PRL 82, 711 (1999)

  30. Average of aμ: CPT? Exp.World Average: aμ(exp)=11 659 208(6)×10-10 (0.5 ppm) aμ(exp)- aμ(SM) = 27 (10)×10-10, 2.7σ, based on e+e- data aμ(exp)- aμ(SM) = 12 (9) ×10-10, 1.4σ, based on -data

  31. G.B. et al., hep-ex/0401008

  32. Beyond standard model, e.g. SUSY W. Marciano, J. Phys. G29 (2003) 225

  33. Prospects and Summary • Experimental measurement of the anomalous magnetic moment of negative muons to 0.7 ppm. • Combined with the positive muon result: 0.5ppm • More data from the theory front will be analyzed: Novosibirsk, KLOE, BaBar, Belle. • The g-2 collaboration is working towards reducing the experimental error by a factor of 2.

  34. Electric Dipole Moments in Storage Rings • EDMs: Why are they important? • Experimental Techniques • EDMs in Storage Rings • Prospects of the Field

  35. + - + - Phenom.: only the component along the spin survives... Spin is the only vector…

  36. + T - + - P - + A Permanent EDM Violates both T & P Symmetries:

  37. T P A Permanent EDM Violates both T & P Symmetries:

  38. CPT T-Violation CP-Violation Andrei Sakharov 1967: CP-Violation is one of three conditions to enable a universe containing initially equal amounts of matter and antimatter to evolve into a matter-dominated universe, which we see today….

  39. EDM Searches are Excellent Probes of Physics Beyond the SM: SM: One CP-Violating Phase (CKM), Needs loops with all quark families for a non-zero result (Third Order Effect). 42 CP-Violating Phases, Needs one loop for a non-zero result (First Order Effect). SUSY:

  40. E Small Signal + Compare the Zeeman Frequencies When E-field is Flipped: - Usual Experimental Method

  41. Schiff Theorem:A Charged Particle at Equilibrium Feels no Force……An Electron in a Neutral Atom Feels no Force Either: …Otherwise it Would be Accelerated…

  42. Neutron EDM Vs Year

  43. Neutron EDM at LANSCEAiming for a Factor of 50

  44. S. Lamoreaux at “Lepton Moments” E=5MV/m, T=108s R&D

  45. Schiff Theorem:A Charged Particle at Equilibrium Feels no Force……An Electron in a Neutral Atom Feels no Force Either. However: …the net E-field is not zero!

  46. Electron EDM 10-20 Cs 10-22 Cs 10-24 Xe* Hg Experimental Limit on de (e .cm) Cs 10-26 Tl Tl Tl ?? 10-28 10-30 1960 1970 1980 1990 2000 2010

  47. Current Atomic EDM Limits • Paramagnetic Atoms, 205Tl: electron |de| < 1.610-27e·cm (90%CL) PRL 88, 071805 (2002) • Diamagnetic Atoms, 199Hg Nucleus: |d(199Hg)| < 2.110-28e·cm (95%CL) PRL 86, 2505 (2001)