One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets

One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets

We study the one-loop corrections to the Zbb¯ vertex in extensions of the Standard Model with arbitrary numbers of scalar doublets, neutral scalar singlets, and charged scalar singlets. Starting with a general parameterization of theories with neutral and singly-charged scalar particles, we derive t...

Full description

Bibliographic Details
Main Authors: Duarte Fontes, Luís Lavoura, Jorge C. Romão, João P. Silva
Format: Article
Language:English
Published: Elsevier 2020-09-01
Series:Nuclear Physics B
Online Access:http://www.sciencedirect.com/science/article/pii/S0550321320302170
id doaj-eeb36851ca8549658c963524d641edee
record_format Article
spelling doaj-eeb36851ca8549658c963524d641edee2020-11-25T02:45:45ZengElsevierNuclear Physics B0550-32132020-09-01958115131One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singletsDuarte Fontes0Luís Lavoura1Jorge C. Romão2João P. Silva3Universidade de Lisboa, Instituto Superior Técnico, CFTP, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal; Corresponding author.Universidade de Lisboa, Instituto Superior Técnico, CFTP, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal; Universidade de Lisboa, Instituto Superior Técnico, Departamento de Física, Av. Rovisco Pais 1, 1049-001 Lisboa, PortugalUniversidade de Lisboa, Instituto Superior Técnico, CFTP, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal; Universidade de Lisboa, Instituto Superior Técnico, Departamento de Física, Av. Rovisco Pais 1, 1049-001 Lisboa, PortugalUniversidade de Lisboa, Instituto Superior Técnico, CFTP, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal; Universidade de Lisboa, Instituto Superior Técnico, Departamento de Física, Av. Rovisco Pais 1, 1049-001 Lisboa, PortugalWe study the one-loop corrections to the Zbb¯ vertex in extensions of the Standard Model with arbitrary numbers of scalar doublets, neutral scalar singlets, and charged scalar singlets. Starting with a general parameterization of theories with neutral and singly-charged scalar particles, we derive the conditions that, in a renormalizable model, must be obeyed by the couplings in order for the divergent contributions to cancel. Then, we show that those conditions are indeed obeyed by the models that we are interested in, and we write down the full finite expression for the vertex in those models. We apply our results to some particular cases, highlighting the importance of the diagrams with neutral scalars.http://www.sciencedirect.com/science/article/pii/S0550321320302170
collection DOAJ
language English
format Article
sources DOAJ
author Duarte Fontes
Luís Lavoura
Jorge C. Romão
João P. Silva
spellingShingle Duarte Fontes
Luís Lavoura
Jorge C. Romão
João P. Silva
One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
Nuclear Physics B
author_facet Duarte Fontes
Luís Lavoura
Jorge C. Romão
João P. Silva
author_sort Duarte Fontes
title One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
title_short One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
title_full One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
title_fullStr One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
title_full_unstemmed One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
title_sort one-loop corrections to the zbb¯ vertex in models with scalar doublets and singlets
publisher Elsevier
series Nuclear Physics B
issn 0550-3213
publishDate 2020-09-01
description We study the one-loop corrections to the Zbb¯ vertex in extensions of the Standard Model with arbitrary numbers of scalar doublets, neutral scalar singlets, and charged scalar singlets. Starting with a general parameterization of theories with neutral and singly-charged scalar particles, we derive the conditions that, in a renormalizable model, must be obeyed by the couplings in order for the divergent contributions to cancel. Then, we show that those conditions are indeed obeyed by the models that we are interested in, and we write down the full finite expression for the vertex in those models. We apply our results to some particular cases, highlighting the importance of the diagrams with neutral scalars.
url http://www.sciencedirect.com/science/article/pii/S0550321320302170
work_keys_str_mv AT duartefontes oneloopcorrectionstothezbbvertexinmodelswithscalardoubletsandsinglets
AT luislavoura oneloopcorrectionstothezbbvertexinmodelswithscalardoubletsandsinglets
AT jorgecromao oneloopcorrectionstothezbbvertexinmodelswithscalardoubletsandsinglets
AT joaopsilva oneloopcorrectionstothezbbvertexinmodelswithscalardoubletsandsinglets
_version_ 1724760600103354368

Similar Items