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Resonantly Enhanced CP Violation

and Relaxation in EWB



Christopher Lee

Institute for Nuclear Theory, University of Washington



With Vincenzo Cirigliano,

Michael Ramsey-Musolf and Sean Tulin

California Institute of Technology

Outline



 Quantum Transport Equations

from Closed Time Path QFT



 Resonant Enhancements in:

 CP Violating Sources

 Relaxation Rates





 Solution for Baryon Asymmetry

 EDM constraints

Goal



 Derive transport equations for particle

densities:

Thermal expectation values of currents:



where







Bosons



Fermions

Densities in MSSM Baryogenesis

 Densities for supermultiplets:



Assume supergauge

interactions keep

superpartners in

chemical equilibrium









 Relate particle densities to chemical potentials:

Transport Equations

 Coupled transport equations for particle densities:

Huet,

Nelson

(1995):

Transport Equations

 Coupled transport equations for particle densities:

Huet,

Nelson

(1995):









Next talk:

Riotto; Role of flavor

This talk: transfer

Carena et al.: resonant

Resonant relaxation

enhancements from CTP

from CTP

(Higgsino source is dominant, but will illustrate calculation of squark source in this talk.)

Nonequilibrium QFT



 Expectation value in given “in” state:









“path-ordering”









+

– x0

Green’s Functions



x0

 Four possible Green’s functions on contour:

Schwinger-Dyson Equations

1. Apply:









2. Subtract

two equations



3. Take x=y

limit…

Quantum Transport Equations



 Obtain:

CP-violating and

conserving

interactions enter

self-energies









 Spectral representation of Green’s functions:







 Expand in :

 CP-violating source appears at zeroth order

 Relaxation terms appear at linear order

Examples of Self-Energies

 Fermion and scalar interactions with Higgs vevs, Higgs

particles, and Higgsinos







contribution to









contribution to

CP-violating Source Riotto







 CP-violating contribution to source:

“Decoherence”









Resonant enhancement

when





“Degeneracy”

Relaxation Terms Cirigliano,

CL,

Ramsey-

Musolf

 CP-conserving contribution to source:

Keep chemical potential to first order in









Resonant enhancement

when

Higgsino Source and Relaxation





Huet-Nelson



M2 = 200 GeV M2 = 200 GeV

Solution for Baryon Density

 Insert solution for into equation for







 Baryon density left over inside bubble of broken

EW phase:

(constant)







Resonant enhancements of relaxation terms mitigate

but do not cancel out those of CP-violating sources

Combined BAU & EDM constraints

(1-loop; for 2-loop, see S. Profumo talk)









de (Tl) de









BAU BAU

dn (ILL) dn

The Future of Baryogenesis

 Progress towards more complete, consistent

calculation of BAU with non-equilibrium QFT



 To do:

 Resummation of Higgs vev insertions,

account for mixing of flavor eigenstates

(cf. Konstandin et al., Carena et al.)



 Relax approximation of gauge or superpartner equilibrium





 Next talk: Effect of GY terms in transport

equations



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