K. Long – U.C. Irvine - p. 1/ Muon Physics at the front end of a - Factory • At a -factory beams of 10 13 - 10 14 /s could be developed. • Two types of experiments are especially suited to such fluxes: – Search for a permanent electric dipole moment d – Search for lepton flavor violation in muon decay • Such experiments would continue the long history that muon physics has with the development of the Standard Model, and searches for physics beyond it.
Muon Physics at the front end of a n -Factory. At a n -factory beams of 10 13 - 10 14 m /s could be developed. Two types of experiments are especially suited to such fluxes: Search for a permanent electric dipole moment d m Search for lepton flavor violation in muon decay - PowerPoint PPT Presentation
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K. Long – U.C. Irvine - p. 1/
Muon Physics at the front end of a -Factory• At a -factory beams of 1013 - 1014 /s
could be developed. • Two types of experiments are especially
suited to such fluxes:– Search for a permanent electric dipole moment
d
– Search for lepton flavor violation in muon decay
• Such experiments would continue the long history that muon physics has with the development of the Standard Model, and searches for physics beyond it.
K. Long – U.C. Irvine - p. 2/
SM information/constraints from the muon:
• The strength of the weak interaction– i.e. the Fermi constant G from
• The fundamental nature of the weak interaction: V-A
• Lepton flavor conservation in -decay: → e , + → e+ e+ e-, N → e- N, are not yet seen
• VEV of the Higgs field:
• Induced form-factors in nuclear -capture• Limits on non-standard model physics from
the muon anomalous magentic moment a
K. Long – U.C. Irvine - p. 3/
• Muon Magnetic Dipole Momoment a chiral changing
• Muon EDM
P T CP
Three experiments that would most benefit from high flux:
K. Long – U.C. Irvine - p. 4/
Three experiments that would most benefit from high flux:• Muon Magnetic Dipole Momoment a chiral
changing
• Muon EDM
• Lepton Flavor Violation
P T
K. Long – U.C. Irvine - p. 5/
aμ, d LFV are sensitive to a wide range of new physics including SUSY. e.g. a is sensitive to:
• substructure
• SUSY (with large tanβ )
• many other things (extra dimensions, etc.)
K. Long – U.C. Irvine - p. 6/
The new theory value reported by S. Eidelman at ICHEP06 a difference with SM of 3.3
K. Long – U.C. Irvine - p. 7/
Left -Right
MSSM ~
Multi Higgs
MSSM
~ 1
10-24
10-22
10-26
10-28
10-30
10-32
10-34
10-36
e EDM (e.cm)
E. Hinds’ e-EDM experiment
at Imperial College with YbF molecules
is startingto explore this region
Standard Model
de < 1.6 x 10-27 e.cm
Commins (2002)
Excluded region (Tl atomic beam)
with thanks to Ed Hinds
n
199Hg
K. Long – U.C. Irvine - p. 8/
SUSY connection between a , Dμ , μ → e through the slepton mixing matrix → e MDM, EDM
~ ~
K. Long – U.C. Irvine - p. 9/
Past and Future of LFV Limits
+ e-→-
e+
Bra
nchi
ng R
atio
Lim
it
K. Long – U.C. Irvine - p. 10/
Experiments that can use the highest muon intensity:
• muon-electron conversion: to ~ 10-20
– Present Limit for - Ti: BR < 6 X 10-13
– PRISM/PRIME proposal •10-18 – 10-19 single event sensitivity
– -Fact front-end, 10-20
• muon EDM search– ~10-25 e cm needs NP2 of ~1018
– present limit d 10-19 e cm<~
K. Long – U.C. Irvine - p. 11/
Muon Summary and Outlook• The muon has provided us with much knowledge on
how nature works. New experiments on the horizion continue this tradition.
• Muon (g-2), with a precision of 0.5 ppm, has a 3.3 discrepancy with the standard model.
• If this discrepancy is from new physics, it would show up in an EDM and perhaps in LFV as well.
• MEG is set to turn on and collect data in the next year. • - → e- conversion holds the best experimental
prospect for going much further on LFV.
• There is an exciting program of muon physics that can be done at a -factory!