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Precision test of baryogenesis

Grant number: 19/11197-6
Support type:Research Grants - Young Investigators Grants
Duration: March 01, 2020 - February 28, 2025
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Chee Sheng Fong
Grantee:Chee Sheng Fong
Home Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil


The Baryon-antibaryon Asymmetry of the Universe (BAU) is confirmed by two distinct cosmological measurements: the light element abundances from Big Bang Nucleosynthesis (BBN) and the temperature anisotropy in the Cosmic Microwave Background (CMB). Although the Standard Model of particle physics and cosmology contain all the necessary ingredients to generate a BAU through the so-called baryogenesis, they turn out to be insufficient and new physics is called for. Baryogenesis which relies on baryon number violation due to the nontrivial ElectroWeak (EW) vacuum had to occur above the EW scale around 100 GeV and in principle could occur at temperature as high as the Grand Unified Theories (GUTs) scale of 10^{16} GeV after cosmic inflation took place. Another important evidence of new physics, the tiny neutrino mass of eV scale naturally points to lepton number violation not far from the GUTs scale through the so-called seesaw mechanism. This lepton number violation opens up a new avenue of baryogenesis through leptogenesis. If baryogenesis were to occur at temperature much higher than 100 GeV, direct experimental test will be challenging. In this project, we propose to indirectly verify high scale baryogenesis through precision test. In particular, we aim to derive precise analytical expressions which allow to calculate the generated BAU taking into account various important effects like that of lepton flavors and spectator particles in the thermal bath. Incorporating these results, we will develop a public software which will allow to test more fundamental models like GUTs where one needs to reproduce low energy observables as well as the observed BAU. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NISHI, CELSO C.; FONG, CHEE SHENG. Leptogenesis in the mu tau basis. Journal of High Energy Physics, n. 7 JUL 21 2020. Web of Science Citations: 0.

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