combined analysis of edms and lepton flavor violating rare decays
DESCRIPTION
Combined analysis of EDMs and Lepton Flavor Violating rare decays. YASAMAN FARZAN IPM, Tehran. Manifestation of heavy states. Direct production at accelerators Indirect effects in low energy phenomena. Historic example: Beta decay is the indirect manifestation of W-boson. - PowerPoint PPT PresentationTRANSCRIPT
Combined analysis of EDMs and Lepton Flavor Violating rare
decays
YASAMAN FARZAN
IPM, Tehran
Manifestation of heavy states
Direct production at acceleratorsIndirect effects in low energy phenomena
Historic example: Beta decay is the indirect manifestation of W-boson.
Beta decay was discovered in the late 19th century.Direct production of W boson took place only in 1980’s.
Models predicting heavy states SUSY models Extra dimensions various Higgs models …
All these models predict heavy particles to be directly produced at LHC….
Indirect Effects in Low Energy Experiments
Lepton Flavor Violating (LFV) processes:
Magnetic Dipole Moment:
Electric Dipole Moments (EDMs)…..
In this talk, we shall focus on LFV and EDMs and theirCombined analysis.
In parallel to the progress in the high energy frontier (via LHC and hopefully via ILC), in upcoming years we expect breakthrough in the low energy experiments, too.
Unlike the historic example of beta decay and W-boson discovery, in the present era, progressin both directions (low energy and high energy) takes place simultaneously.
Complementary information can be derived by combining the results.
Limitations of LHCSuppose SUSY (or some other BSM) is discoveredat LHC. Little or none can be learned about the the CP-violating phases in the lepton sector at LHC (see however, Godbole Czech J Physc 55; Heinemeyer and Velasco, hep-ph/0506267; Kittel, hep-ph/0504183 ). ILCMeasuring CP-violation Low energy experimentsSearches for EDMs can teach us about the CP-violating phases
EDM and MDM under CP
CP:
CP:
MDM conserves CP but EDM violates CP.
Present bound and prospects for improvement
Present bound: [PDG]
Near future: DeMille et al
Foreseeable future: Lamoreaux, nucl-ex/0109014(employing solid state techniques; Shapiro’s old idea) The phase of CKM: The phases of PMNS: de Gouvea, Gopalakrishna, PRD72Positive signal New Physics
Importance of CP-violationAmong all the parameters of a theory, CP-violating phases hold a place of honor because CP-violation is one of the three famous Sakharov’s conditions for dynamically creating the Baryon asymmetry of the universe.The CP-violating phase that we would measure in the labs might be in the heart of the fundamental question why our body as well as the whole universe around us (so far explored) is made of matter rather than anti-matter.
Which phase is responsible for baryogenesis?
In the framework of some models, the CP-violating phase that is responsible for baryogenesis can also show up in the EDM; e.g., (the phase of bilinear Higgs term in the superpotential ) which leads to both Electroweak baryogenesis and EDM.
Not all the CP-violating phases contributing to EDM can lead to successful baryogenesis. To disentangle the different contributions and to pinpoint the effect of the mu-term, one has to work out all the phases.
Neutrino oscillationThe only evidence so far for physics BSM comes from observation of neutrino oscillation. Contribution of neutrino masses to LFV processes:
Petcov Sov J. NP25; Bilenky et al, PLB67; Altarelli et al, NPB125
PDG
Positive signal in future Physics BSM
Benerjee, hep-ex/0702017
LFV and CP-violation in MSSM
at one-loop
Strong bounds on
Effect of on NO LFV No one loop contributionTwo-loop effect exists but the effect is suppressed.LFV:
To have sizeable effect, and have to be both relatively large.
Ayazi and Farzan, JHEP0706
Present bounds on and prospects for improvements Banerjee, hep-ex/0702017
Super B-factory (physics/0512235)
Other effects of complex
Complex does not contribute to Baryogenesis.
Phase of can manifest itself in decay and production of staus and can in principle be measuredat ILC. Gajdosik, Godbole and Kraml, JHEP 0409; Bartl et al., PRD66
It will be exciting to derive complementary information on this phase from low energy experiments.
Condition for sizeable effect
If orthe contribution of to is suppressed evenif is close to its present bound and is large.
Contribution of the phase of
Left-right ratioSuppose in future is detected.Q: Is there a way to extract ? A: Yes, by studying the angular distribution of the final particles:
is the angle between the spin of tau and the momentum of the emitted
Measurement and interpretation of
By studying the angular distributions of the final particlesat an collider such as B-factory, it will be possibleto extract the value of . Kitano and Okada, PRD63 (2001) 113003
Interpretation of :
or
Present bound
Near Future reach
Correlation of and
The dots depicted by the same color and symbol in the two panels correspond to the same scatter point
All other phases=0
Present bound
Near Future reach
Correlation of and
In the case of the purple dots for which regardless of electron EDM is very small and below the reach of the current experiments.
Present bound
Near Future reach
Correlation of and
For (to be tested by super B-factory) regardless of the value of , is smaller than the present bound.
Present bound
Near Future reach
Correlation of and
If and , there is a good chance of detecting in near future (blue dots) provided that is sizable .
Conclusions By combining the information from
LFV and EDMexperiments, valuable information can
be derived on CP-violationwhich can be considered
complementary to or a cross check of the CP study at ILC.