Nov.9, 2006, SNULeptogenesis & Triplet Seesaw1 Leptogenesis and Triplet Seesaw Eung Jin Chun KIAS TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A Based on hep-ph/ in collaboration with S. Scopel

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw2 Matter-Antimatter asymmetry of the universe No antimatter around us. Observation: Asymmetrical initial condition after bigbang? Generation of the asymmetry starting from matter-antimatter symmetrical universe: “baryogenesis” Sakharov condition: (1967)  B or L violation  C and CP violation  Out of equilibrium

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw3 Electroweak Spharelon Processes B & L are conserved classically in SM. Invariant under 6-3=3 U(1) symmetries SU(3) c £ SU(2) L £ U(1) Y

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw4 Electroweak Spharelon Processes B+L is anomalous under SU(2) L and thus broken by quantum effect. Efficient spharelon transitions at T>M W.

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw5 Equilibrium distributions of charge asymmetries Equilibirum number densities: For T À m,  For T ¿ m Charge asymmetry in X: FD BE for FD/BE

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw6 Equilibrium distributions of charge asymmetries B & L asymmetry: Spharelon erasure:  B =  L=3 Gauge charge neutrality:

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw7 Equilibrium distributions of charge asymmetries All gauge and Yukawas in equilibrium: Initial asymmety in transfers to B/L:

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw8 Leptogenesis and Neutrino masses  Neutrino masses observed:  Majorana nature of the small mass from L violation:  Requires new particles as the source of L violation at high scale.  Heavy particle decay falls into out-of-equilibrium for T<M X prohibiting inverse decays.  Provided a nontrivial CP phase in the decay, a cosmological L asymmetry may arise as required by the observation.

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw9 Leptogenesis in Singlet Seesaw Seesaw through singlet RHNs with heavy Majorana masses: RHN decay produces CP/L asymmetry: tree+loop interference with CP phase in Yukawas

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw10 Leptogenesis in Singlet Seesaw CP asymmetry in RHN decay: for M 2,3 À M 1 with  eff · 1

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw11 Leptogenesis in Singlet Seesaw Boltzmann equation: Inverse decay effective for K À 1

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw12 Leptogenesis in Singlet Seesaw Approximate solution: Damping factor by inverse decay: Cosmological lepton asymmetry:  ID =H

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw13 Leptogenesis in Triplet Seesaw Supersymmetric Higgs Triplets with Y=1,-1 Neutrino mass via seesaw in VEV: Triplet decays produce L asymmetry:

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw14 Leptogenesis in Triplet Seesaw Boltzmann Equations Gauge annihilation:   *  WW :

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw15 Leptogenesis in Triplet Seesaw Decay vs. Annihilation: Leptogenesis Phenomenology with 5 independent parameters:

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw16 Amount of CP violation required by observation in SM with only two channles: X  LL, HH Efficience increases far away from B L =B H =1/2

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw17 Role of the third channel X  H 1 H 1 in SUSY

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw18 Lepton asymmetry generation with vanishing  L

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw19 Features with  slow &  fast for slow (K i ¿ 1) & fast (K i À 1) channel.  slow =1: Efficiency reaches maximum. Inverse decays in the slow channel freeze out early, and annihilations determine the triplet density up to quite large mass M. The final asymmetry is a growing function of K parameter and is insensitive to  fast. Even  L =  fast =0 can lead to efficient leptogenesis.  slow and one slow channel: The final lepton asymmetry is suppressed. Inverse decays freeze out late (z f » ln K À 1), and decay is typically dominant over annihilation except for very small M. As a consequence, the efficiency scales as 1/(z f K) with K À 1.

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw20  slow <1 and two slow channels: The slow channel with large  i drives leptogenesis with a good efficiency. The system is practically with two decay channels as in SM. If  slow =  L,2, the phenomenology is different from SM case because K now is much bigger, reducing the efficiency at high masses and improving it at lower ones. Features with  slow &  fast for slow (K i ¿ 1) & fast (K i À 1) channel.

Nov.9, 2006, SNULeptogenesis & Triplet Seesaw21 Conclusion Matter-Antimatter asymmetry of the Universe requires New Physics: B/L violation, new CP phase. It may have the same origin as the neutrino mass generation. Revelation of such connection in the future experiments? Successful leptogenesis can be attained in a wide range of scenarios in supersymmetric triplet seesaw model.