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Sources for electroweak baryogenesis

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DOI: 10.1142/9789812792129_0060
OAI: oai:inspirehep.net:513890
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INSPIRE-HEP
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Abstract

I review a computation of the baryon asymmetry arising from a first order electroweak phase transition in the Minimal Supersymmetric Standard model by classical force mechanism (CFM). I focus on CP violation provided by the charginos and show that it is the usually neglected sum of the two Higgsino fields, H<sub>1</sub> + H<sub>2</sub>, which gives a larger contribution to the baryon asymmetry than does the combination H<sub>1</sub> - H<sub>2</sub>. In fact, the latter contribution is exactly zero in CFM, because it is associated with a phase transformation of the fields. Baryogenesis is found to be most effective in MSSM CFM when only <alternatives xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:oasis="http://docs.oasis-open.org/ns/oasis-exchange/table"><span class="NLM_inline-graphic"><img src="/na101/home/literatum/publisher/wspc/books/content/books/2000/4550/9789812792129_0060/production/images/medium/9789812792129_0060m001.gif" alt="" /></span></alternatives> is light, which lends independent support for the "light stop scenario", and it remains viable for CP-violating phases as small as δ<sub>µ</sub> ~ few × 10<sup>-3</sup>.

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