Towards Reviving Electroweak Baryogenesis with a Fourth Generation

Towards Reviving Electroweak Baryogenesis with a Fourth Generation

Electroweak baryogenesis is an attractive scenario for explaining the baryon asymmetry of the universe. However, it does not work within the standard model due to two reasons: (1) the strength of CP violation from the Kobayashi-Maskawa mechanism with three generations is too small; (2) the electrowe...

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Main Authors: Wei-Shu Hou, Masaya Kohda
Format: Article
Language:English
Published: Hindawi Limited 2013-01-01
Series:Advances in High Energy Physics
Online Access:http://dx.doi.org/10.1155/2013/769240
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spelling doaj-0dbaa59cf8a34325b9e6e5cb5261d69c2020-11-24T22:36:51ZengHindawi LimitedAdvances in High Energy Physics1687-73571687-73652013-01-01201310.1155/2013/769240769240Towards Reviving Electroweak Baryogenesis with a Fourth GenerationWei-Shu Hou0Masaya Kohda1Department of Physics, National Taiwan University, Taipei 10617, TaiwanDepartment of Physics, National Taiwan University, Taipei 10617, TaiwanElectroweak baryogenesis is an attractive scenario for explaining the baryon asymmetry of the universe. However, it does not work within the standard model due to two reasons: (1) the strength of CP violation from the Kobayashi-Maskawa mechanism with three generations is too small; (2) the electroweak phase transition is not first order for the experimentally allowed Higgs boson mass. We discuss possibilities to solve these problems by introducing a fourth generation of fermions and how electroweak baryogenesis might be revived. We also discuss briefly the recent observation of a Higgs-like boson with mass around 125 GeV, which puts the fourth generation in a difficult situation, and the possible way out.http://dx.doi.org/10.1155/2013/769240
collection DOAJ
language English
format Article
sources DOAJ
author Wei-Shu Hou
Masaya Kohda
spellingShingle Wei-Shu Hou
Masaya Kohda
Towards Reviving Electroweak Baryogenesis with a Fourth Generation
Advances in High Energy Physics
author_facet Wei-Shu Hou
Masaya Kohda
author_sort Wei-Shu Hou
title Towards Reviving Electroweak Baryogenesis with a Fourth Generation
title_short Towards Reviving Electroweak Baryogenesis with a Fourth Generation
title_full Towards Reviving Electroweak Baryogenesis with a Fourth Generation
title_fullStr Towards Reviving Electroweak Baryogenesis with a Fourth Generation
title_full_unstemmed Towards Reviving Electroweak Baryogenesis with a Fourth Generation
title_sort towards reviving electroweak baryogenesis with a fourth generation
publisher Hindawi Limited
series Advances in High Energy Physics
issn 1687-7357
1687-7365
publishDate 2013-01-01
description Electroweak baryogenesis is an attractive scenario for explaining the baryon asymmetry of the universe. However, it does not work within the standard model due to two reasons: (1) the strength of CP violation from the Kobayashi-Maskawa mechanism with three generations is too small; (2) the electroweak phase transition is not first order for the experimentally allowed Higgs boson mass. We discuss possibilities to solve these problems by introducing a fourth generation of fermions and how electroweak baryogenesis might be revived. We also discuss briefly the recent observation of a Higgs-like boson with mass around 125 GeV, which puts the fourth generation in a difficult situation, and the possible way out.
url http://dx.doi.org/10.1155/2013/769240
work_keys_str_mv AT weishuhou towardsrevivingelectroweakbaryogenesiswithafourthgeneration
AT masayakohda towardsrevivingelectroweakbaryogenesiswithafourthgeneration
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