Cosmic microwave background, matter–antimatter asymmetry and neutrino masses

By W. Buchmuller, P. Bari, M. Plümacher. 2002

361 citations recorded by the source corpus.

Abstract We study the implications of thermal leptogenesis for neutrino parameters. Assuming that decays of N 1 , the lightest of the heavy Majorana neutrinos, initiate baryogenesis, we show that the final baryon asymmetry is determined by only four parameters: the CP asymmetry e 1 , the heavy neutrino mass M 1 , the effective light neutrino mass m 1 , and the quadratic mean m of the light neutrino masses. Imposing the CMB measurement of the baryon asymmetry as constraint on the neutrino parameters, we show, in a model independent way, that quasi-degenerate neutrinos are incompatible with thermal leptogenesis. For maximal CP asymmetry e 1 , and neutrino masses in the range from ( Δm 2 sol ) 1/2 to ( Δm 2 atm ) 1/2 , the baryogenesis temperature is T B = O (10 10 ) GeV.

View Paper: https://www.semanticscholar.org/paper/3fc3b035a8b004b34bace0eb175191ff7de94ff9

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

Citations in the corpus

Baryogenesis from the weak scale to the grand unification scale (2020, methodology): “The flavor structure is chosen according to Buchmuller and Yanagida (1999) and was already described in Sec. IV.E. The B − L breaking part of W is precisely the superpotential of F-term hybrid inflation (FHI). It was widely believed that FHI could not account for the correct scalar spectral index of”
Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results (2012, result): “rd (p∼ T) electroweak gauge bosons or third-generation quarks contribute to the leading order production rate as well. Quark-initiated processes have been taken into account by many authors (see e.g. [18, 19, 20, 21]), explicit results for the corresponding rate were shown in [19, 21]. Gauge boson s”
Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, background): “one finds that the observed baryon asymmetry is generated as long as [145,186,187]”
Hierarchical neutrino mass matrices, CP violation and leptogenesis (2003, unknown): “ts an upper bound on the lightest M1, typically M1 & 108GeV [5]. Thermal leptogenesis requires that the reheating temperature TR be such that M1 . TR, in this context a model independent analysis [54] has given a constraint of the re-heating temperature to be TR ≈ M1 = O(1010GeV). This temperatu”