CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Biondini, Simone; Brambilla, Nora; Vairo, Antonio

doi:10.1007/jhep09(2016)126

Cited by 24 publications

(28 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note that in the exact degenerate case the CP phases can be rotated away leading to purely real Yukawa couplings, and, therefore, to a vanishing CP asymmetry [15]. We will discuss the hierarchical case elsewhere [25].…”

Section: Jhep03(2016)191mentioning

confidence: 99%

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case

Biondini

Brambilla

Escobedo

et al. 2016

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

In a model where Majorana neutrinos heavier than the electroweak scale couple to Standard Model Higgs bosons and leptons, we compute systematically thermal corrections to the direct and indirect CP asymmetries in the Majorana neutrino decays. These are key ingredients entering the equations that describe the thermodynamic evolution of the induced lepton-number asymmetry eventually leading to the baryon asymmetry in the universe. We compute the thermal corrections in an effective field theory framework that assumes the temperature smaller than the masses of the Majorana neutrinos and larger than the electroweak scale, and we provide the leading corrections in an expansion of the temperature over the mass. In this work, we consider the case of two Majorana neutrinos with nearly degenerate masses.

show abstract

Section: Jhep03(2016)191mentioning

confidence: 99%

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case

Biondini

Brambilla

Escobedo

et al. 2016

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cutting rules are exploited to select a lepton or an antilepton as final state particle in the two-loop diagrams [46][47][48]. A detailed example of their implementation for diagrams with the same topology can be found in [54,55], where standard leptogenesis with heavy Majorana neutrinos and seesaw type I is considered. Following the same notation, we may write the flavoured CP asymmetry (4.1) due to the vertex diagram, …”

Section: Cp Asymmetrymentioning

confidence: 99%

Leptogenesis and composite heavy neutrinos with gauge-mediated interactions

Biondini

Panella

2017

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

Leptogenesis is an appealing framework to account for the baryon asymmetry in the universe. To this end physics beyond the standard model is demanded. In this paper we investigate the possibility to attain successful leptogenesis with composite Majorana neutrinos. We work in the framework of effective gauge-mediated and contact interactions without any reference to an underlying compositeness theory. This approach is the one adopted in all current experimental searches for composite fermions at colliders. In the case of gauge-mediated interactions, we calculate the CP asymmetry in heavy composite neutrino decays. Both the direct and the indirect CP asymmetry are derived and resonant leptogenesis is also discussed. We find that the Sakharov conditions can be met and, for some choice of the parameters, the correct order of magnitude of the baryon asymmetry is reproduced.

show abstract

“…The computation of the corrections to the decay width was our way to cross-check the exactness of the EFT and we have seen the we correctly reproduce the results of full theory calculations in a simpler way. The next step is to apply this technique to quantities that were not yet known and whose computation using just the full theory would be prohibitively difficult, an example of this is the lepton asymmetry that was discussed in [16,17]. The lepton asymmetry is a quantity that measures how much more likely is the decay of a Majorana neutrino into leptons than to antileptons and is defined by…”

Section: The Lepton Asymmetrymentioning

confidence: 99%

“…where M = M 1 and Λ = M 2 − M 1 .The hierarchical case M 2 M 1 was studied in [17] giving the result…”

Section: The Lepton Asymmetrymentioning

confidence: 99%

Effective Field Theories for heavy probes in a hot QCD plasma and in the early universe

Escobedo

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. There are many interesting problems in heavy-ion collisions and in cosmology that involve the interaction of a heavy particle with a medium. An example is the dissociation of heavy quarkonium seen in heavy-ion collisions. This was believed to be due to the screening of chromoelectric fields that prevents the heavy quarks from binding, however in the last years several perturbative and lattice computations have pointed out to the possibility that dissociation is due to the finite lifetime of a quarkonium state inside the medium. Regarding cosmology, the study of the behavior of heavy Majorana neutrinos in a hot medium is important to understand if this model can explain the origin of dark matter and the baryon asymmetry. A very convenient way of studying these problems is with the use of non-relativistic effective field theories (EFTs), this allows to make the computations in a more systematic way by defining a more suitable power counting and making it more difficult to miss necessary resummations. In this proceedings I will review the most important results obtained by applying the EFT formalism to the study of quarkonium suppression and Majorana neutrinos, I will also discuss how combining an EFT called potential non-relativistic QCD (pNRQCD) with concepts coming from the field of open quantum systems it is possible to understand how the population of the different quarkonium states evolve with time inside a thermal medium.

show abstract

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Cited by 24 publications

References 70 publications

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case

Leptogenesis and composite heavy neutrinos with gauge-mediated interactions

Effective Field Theories for heavy probes in a hot QCD plasma and in the early universe

Contact Info

Product

Resources

About