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Standard Model CP-violation and baryon asymmetry; 1, zero temperature
We consider quantum effects in a world with two coexisting symmetry phases, unbroken and spontaneously broken, as a result of a first order phase transition. The discrete symmetries of the problem are discussed in general. We compute the exact two-point Green function for a free fermion, when a thin...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
1994
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/0550-3213(94)00409-9 http://cds.cern.ch/record/264361 |
_version_ | 1780886495935070208 |
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author | Gavela-Legazpi, Maria Belen Lozano, M Orloff, J Pène, O |
author_facet | Gavela-Legazpi, Maria Belen Lozano, M Orloff, J Pène, O |
author_sort | Gavela-Legazpi, Maria Belen |
collection | CERN |
description | We consider quantum effects in a world with two coexisting symmetry phases, unbroken and spontaneously broken, as a result of a first order phase transition. The discrete symmetries of the problem are discussed in general. We compute the exact two-point Green function for a free fermion, when a thin wall separates the two phases. The Dirac propagator displays both massive and massless poles, and new CP-even phases resulting from the fermion reflection on the wall. We discuss the possible quark-antiquark CP asymmetries produced in the Standard Model(SM) for the academic T=0 case. General arguments indicate that an effect first appears at order \alpha_W in the reflection amplitude, as the wall acts as a source of momentum and the on-shell one-loop self-energy cannot be renormalized away. The asymmetries stem from the interference of the SM CP-odd couplings and the CP-even phases in the propagator. We perform a toy computation that indicates the type of GIM cancellations of the problem. The behaviour can be expressed in terms of two unitarity triangles. |
id | cern-264361 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1994 |
record_format | invenio |
spelling | cern-2643612019-09-30T06:29:59Zdoi:10.1016/0550-3213(94)00409-9http://cds.cern.ch/record/264361engGavela-Legazpi, Maria BelenLozano, MOrloff, JPène, OStandard Model CP-violation and baryon asymmetry; 1, zero temperatureParticle Physics - TheoryWe consider quantum effects in a world with two coexisting symmetry phases, unbroken and spontaneously broken, as a result of a first order phase transition. The discrete symmetries of the problem are discussed in general. We compute the exact two-point Green function for a free fermion, when a thin wall separates the two phases. The Dirac propagator displays both massive and massless poles, and new CP-even phases resulting from the fermion reflection on the wall. We discuss the possible quark-antiquark CP asymmetries produced in the Standard Model(SM) for the academic T=0 case. General arguments indicate that an effect first appears at order \alpha_W in the reflection amplitude, as the wall acts as a source of momentum and the on-shell one-loop self-energy cannot be renormalized away. The asymmetries stem from the interference of the SM CP-odd couplings and the CP-even phases in the propagator. We perform a toy computation that indicates the type of GIM cancellations of the problem. The behaviour can be expressed in terms of two unitarity triangles.hep-ph/9406288CERN-TH-7262-94FAMNSE-94-12HD-THEP-94-19LPTHE-94-48NSF-ITP-94-64oai:cds.cern.ch:2643611994 |
spellingShingle | Particle Physics - Theory Gavela-Legazpi, Maria Belen Lozano, M Orloff, J Pène, O Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title | Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title_full | Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title_fullStr | Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title_full_unstemmed | Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title_short | Standard Model CP-violation and baryon asymmetry; 1, zero temperature |
title_sort | standard model cp-violation and baryon asymmetry; 1, zero temperature |
topic | Particle Physics - Theory |
url | https://dx.doi.org/10.1016/0550-3213(94)00409-9 http://cds.cern.ch/record/264361 |
work_keys_str_mv | AT gavelalegazpimariabelen standardmodelcpviolationandbaryonasymmetry1zerotemperature AT lozanom standardmodelcpviolationandbaryonasymmetry1zerotemperature AT orloffj standardmodelcpviolationandbaryonasymmetry1zerotemperature AT peneo standardmodelcpviolationandbaryonasymmetry1zerotemperature |