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EDM and CPV in the system Gabriel González Sprinberg Instituto de Física, Facultad de Ciencias Montevideo Uruguay gabrielg@fisica.edu.uy DIF06 INFN Laboratori Nazionali di Frascati

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Outline 1. Electric Dipole Moment 1.1 Definition B = , Z, g, … f = e, , ,..., b, t 1.2 Experiments 2. Observables 2.1 High energies 2.2 Low energies 3. Conclusions

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1. EDM 1.1Definition P and T-odd interaction of a fermion with gauge fields : Classical electromagnetism Ordinary quantum mechanics Relativistic quantum mechanics: Dirac equation Non-relativistic limit:

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EDM LANDAU 1957 T, P odd interactions In QFT: CPT Invariance SYMMETRIES: Time reversal T, Parity P Besides, chirality flip (some insight into the mass origin) 1. EDM 1.1Definition

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SM : vertex corrections at least 4-loops Beyond SM: one loop effect (SUSY,2HDM,...) dimension six effective operator EDM 1. EDM 1.1Definition

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SM : V V * E.P.Shabalin ’78 We need 3-loops for a quark-EDM, and 4 loops for a lepton... J.F.Donoghue ’78 I.B.Khriplovich,M.E.Pospelov ‘90 A.Czarnecki,B.Krause ‘97 1. EDM 1.1Definition = 0 !!!

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Fermion of mass m f generated by physics at scale has EDM m f / T-odd EDM has particular interest and depends on the underlying physics of CP violation 1. EDM 1.1Definition

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Effective Lagrangian: CPV: Operators: Other operators: 1. EDM 1.1Definition

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More sensitivity HIGH ENERGY (Z-peak)LOW ENERGY WEDMEDM 1. EDM 1.1Definition

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V = For q 2 =0 EDM GAUGE INVARIANT OBSERVABLE QUANTITIES q 2 =M Z 2 WEDM Beyond SM EDM: Loop calculations 1. EDM 1.1Definition

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PDG ’06 95% CL EDM BELLE ‘02 WEDM ALEPH 1990-95 LEP runs 1. EDM 1.2 Experiments

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For other fermions…. 1. EDM 1.2 Experiments

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SM for EDM is well below within present experimental limits: CKM 3-loops SM prediction CKM 4-loops Hopefully in the SM …15 orders of magnitude below experiments... 2. Observables

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Currents limits on electron EDM gives: However, in many models the EDM do not necessarily scale as the first power of the masses. Multihiggs models 1-loop contributions Vectorlike leptons EDM scale as the cube of the mass! BSM - EDM can go up to 10 -19 e cm 2. Observables

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Non-vanishing signal in a EDM observable NEW PHYSICS One expects: special interest in heavy flavours EDM: In order to be able to measure a genuine non-vanishing signal one has to deal with a -observable

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2. Observables 2.1 High energies Indirect arguments: any other physics may also contribute… Look for, linear effects Genuine CPV observables in –pair production: SPIN TERMS and/or SPIN CORRELATIONS

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2. Observables 2.1 High energies Spin terms angular distribution of decay products Asymmetries in the decay products Expectation values of tensor observables

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2. Observables 2.1 High energies x: Transverse y: Normal z: Longitudinal

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2. Observables 2.1 High energies Tensor observables: Z-peak: W.Bernreuther,O.Nachtmann ‘89 Normal polarization: (and needs helicity-flip) Genuine CPV if J.Bernabeu,GGS,J.Vidal ‘93

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2. Observables 2.1 High energies EDM (and ) is proportional to angular asymmetries, to extract sin cos sin h (more details latter..) One can measure for and/or

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2. Observables 2.2 Low energies Diagrams:

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2. Observables 2.2 Low energies What about the linear terms? Interference with the axial part of Z-exchange, suppressed by q 2 /M Z 2 J.Bernabeu,GGS,J.Vidal ‘04

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2. Observables 2.2 Low energies

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+

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Bounds: For 10 6/7 and at low/ energies upper bound

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3. Conclusions Polarized beams open the possibility for new observables Improving the number of –pairs (...10 11 ? ) allows to lower the EDM bound by many (...2?) orders of magnitude These new bounds may be important for beyond the SM physics

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3. Summary Discussions with J.Bernabeu, J.Vidal and A.Santamaría are gratefully acknowledged SOME REFERENCES J. Bernabeu, G.S., Jordi Vidal Nuclear Physics B 701 (2004) 87–102 Daniel Gomez-Dumm, G.S. Eur. Phys. J. C 11, 293{300 (1999) W. Bernreuther, A. Brandenburg, and P. Overmann Phys. Lett. B 391 (1997) 413; ibid., B 412 (1997) 425.

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