Leptogenesis and neutrino parameters

Falcone, D.; Tramontano, Francesco

doi:10.1103/physrevd.63.073007

Cited by 77 publications

(67 citation statements)

References 45 publications

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“…Quark-lepton symmetry however, renders problematic the implementation of the mechanism of baryogenesis via leptogenesis within the SO(10) see-saw [23,24]. This is due to the two factors of m D in eq.…”

Section: Compact Rh Neutrino Spectrummentioning

confidence: 99%

Squeezing out predictions with leptogenesis from SO(10)

et al. 2012

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We consider the see-saw mechanism within a non-supersymmetric SO(10) model. By assuming the SO(10) quark-lepton symmetry, and after imposing suitable conditions that ensure that the right-handed (RH) neutrino masses are at most mildly hierarchical (compact RH spectrum) we obtain a surprisingly predictive scenario. The absolute neutrino mass scale, the Dirac and the two Majorana phases of the neutrino mixing matrix remain determined in terms of the set of already measured low energy observables, modulo a discrete ambiguity in the signs of two neutrino mixing angles and of the Dirac phase. The RH neutrinos mass spectrum is also predicted, as well as the size and sign of the leptogenesis CP asymmetries. We compute the cosmological baryon asymmetry generated through leptogenesis and obtain the correct sign, and a size compatible with observations.

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Section: Compact Rh Neutrino Spectrummentioning

confidence: 99%

Squeezing out predictions with leptogenesis from SO(10)

et al. 2012

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“…By stating that the mass matrix for n generations can be obtained by "dressing" the one for (n−1) generations, we express in particular our 7 We shall make in the rest of the paper the choice of the identity matrix for simplicity, but this choice is not mandatory. 8 The 2(n − 1) 2 + 1 comes from the following: each entry in…”

Section: General Requirement For Yukawa Matricesmentioning

confidence: 99%

Hierarchies of quark masses and the mixing matrix in the standard theory

Machet¹,

Petcov

2001

Physics Letters B

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Abstract.We study the general dependence of mixing angles on heavy fermion masses when mass hierarchies exist among the fermions. For two generations and small Cabibbo angle, this angle is directly shown to scale like µ 1 /m s ± µ 2 /m c , where |µ 1 | ≪ m s , |µ 2 | ≪ m c are independent mass scales. For n = 3 generations, we extend to the Yukawa matrices of u-and d-type quarks the property that the 2 × 2 upper-left sub-matrix of the Cabibbo-Kobayashi-Maskawa matrix K is a good approximation to the Cabibbo matrix C. Then, without any additional Ansatz concerning the existence of mass hierarchies or the smallness of the mixing angles, the moduli of its entries K 13 , K 23 , K 31 , K 32 are shown to scale like [β 13 , β 23 , β 31 , β 32 ] m c /m t ± [δ 13 , δ 23 , δ 31 , δ 32 ] m s /m b , where the β's and the δ's are coefficients smaller than 10. This method, when used for two generations, gives a dependence on m s and m c "weaker" than the one obtained first, but which matches a well known behaviour for the Cabibbo angle:The asymptotic behaviour in the case of three generations can also be strengthened into a 1/m b,t behaviour by incorporating our knowledge about the hierarchies of quark masses and the smallness of the mixing angles. PACS

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“…For this, certain assumptions concerning the high-energy part of the theory have to be made. Several recent articles dealt with this subject [4,5,6,7,8,9,10,11,12]. In [13] we argued that the left-handed Higgs triplet -which was absent in the previous papers -gives the most important contribution to the neutrino mass matrix (see also Refs.…”

Section: Introductionmentioning

confidence: 99%

A simple connection between neutrino oscillation and leptogenesis

Joshipura

Paschos

Rodejohann

2001

J. High Energy Phys.

101

105

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The usual see-saw formula is modified by the presence of two Higgs triplets in left-right symmetric theories. The contribution from the left-handed Higgs triplet to the see-saw formula can dominate over the conventional one when the neutrino Dirac mass matrix is identified with the charged lepton or down quark mass matrix. In this case an analytic calculation of the lepton asymmetry, generated by the decay of the lightest right-handed Majorana neutrino, is possible. For typical parameters, the out-of-equilibrium condition for the decay is automatically fulfilled. The baryon asymmetry has the correct order of magnitude, as long as the lightest mass eigenstate is not much lighter then 10 −6 to 10 −8 eV, depending on the solution of the solar neutrino problem. A sizable signal in neutrinoless double beta decay can be expected, as long as the smallest mass eigenstate is not much lighter than 10 −3 eV and the Dirac mass matrix is identified with the charged lepton mass matrix. *

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Leptogenesis and neutrino parameters

Cited by 77 publications

References 45 publications

Squeezing out predictions with leptogenesis from SO(10)

Squeezing out predictions with leptogenesis from SO(10)

Hierarchies of quark masses and the mixing matrix in the standard theory

A simple connection between neutrino oscillation and leptogenesis

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