Vector-like bottom quarks in composite Higgs models

M. Gillioz, R. Grober, A. Kapuvari, M. Muhlleitner

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Like many other models, Composite Higgs Models feature the existence of heavy vector-like quarks. Mixing effects between the Standard Model fields and the heavy states, which can be quite large in case of the top quark, imply deviations from the SM. In this work we investigate the possibility of heavy bottom partners. We show that they can have a significant impact on electroweak precision observables and the current Higgs results if there is a sizeable mixing with the bottom quark. We explicitly check that the constraints from the measurement of the CKM matrix element V-tb are fulfilled, and we test the compatibility with the electroweak precision observables. In particular we evaluate the constraint from the Z coupling to left-handed bottom quarks. General formulae have been derived which include the effects of new bottom partners in the loop corrections to this coupling and which can be applied to other models with similar particle content. Furthermore, the constraints from direct searches for heavy states at the LHC and from the Higgs search results have been included in our analysis. The best agreement with all the considered constraints is achieved for medium to large compositeness of the left-handed top and bottom quarks.
OriginalsprogEngelsk
TidsskriftJournal of High Energy Physics
Vol/bind37
Sider (fra-til)2
ISSN1126-6708
DOI
StatusUdgivet - 2014

Citer dette

Gillioz, M. ; Grober, R. ; Kapuvari, A. ; Muhlleitner, M. / Vector-like bottom quarks in composite Higgs models. I: Journal of High Energy Physics. 2014 ; Bind 37. s. 2.
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abstract = "Like many other models, Composite Higgs Models feature the existence of heavy vector-like quarks. Mixing effects between the Standard Model fields and the heavy states, which can be quite large in case of the top quark, imply deviations from the SM. In this work we investigate the possibility of heavy bottom partners. We show that they can have a significant impact on electroweak precision observables and the current Higgs results if there is a sizeable mixing with the bottom quark. We explicitly check that the constraints from the measurement of the CKM matrix element V-tb are fulfilled, and we test the compatibility with the electroweak precision observables. In particular we evaluate the constraint from the Z coupling to left-handed bottom quarks. General formulae have been derived which include the effects of new bottom partners in the loop corrections to this coupling and which can be applied to other models with similar particle content. Furthermore, the constraints from direct searches for heavy states at the LHC and from the Higgs search results have been included in our analysis. The best agreement with all the considered constraints is achieved for medium to large compositeness of the left-handed top and bottom quarks.",
keywords = "Higgs Physics Beyond Standard Model Technicolor and Composite Models MINIMAL FLAVOR VIOLATION BOSON PRODUCTION QCD CORRECTIONS PROTON COLLIDERS HADRON COLLIDERS ELECTROWEAK CORRECTIONS RADIATIVE-CORRECTIONS VACUUM MISALIGNMENT STANDARD MODEL CROSS-SECTIONS",
author = "M. Gillioz and R. Grober and A. Kapuvari and M. Muhlleitner",
note = "ISI Document Delivery No.: AC9AN Times Cited: 8 Cited Reference Count: 200 Gillioz, M. Groeber, R. Kapuvari, A. Muehlleitner, M. DFG/SFB-TR9 Computational Particle Physics; Landesgraduiertenforderung des Landes Baden-Wurttembergs; Danish National Research Foundation [DNRF90] We would like to thank the ATLAS Exotics Group and in particular Mark Cooke and Merlin Davies for giving us access to the results of ATLAS searches for top partners. We also want to thank A. Azatov, A. Belyaev, R. Contino, L. Di Luzio, M. Serone, M. Spira and M. Wiebusch for helpful discussions, and C. Grojean for reading the draft. R.G. and M.M.are supported by the DFG/SFB-TR9 Computational Particle Physics. R.G. acknowledges financial support by the Landesgraduiertenforderung des Landes Baden-Wurttembergs. The CP3-Origins centre is partially funded by the Danish National Research Foundation, grant number DNRF90. 8 SPRINGER NEW YORK J HIGH ENERGY PHYS",
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Vector-like bottom quarks in composite Higgs models. / Gillioz, M.; Grober, R.; Kapuvari, A.; Muhlleitner, M.

I: Journal of High Energy Physics, Bind 37, 2014, s. 2.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Vector-like bottom quarks in composite Higgs models

AU - Gillioz, M.

AU - Grober, R.

AU - Kapuvari, A.

AU - Muhlleitner, M.

N1 - ISI Document Delivery No.: AC9AN Times Cited: 8 Cited Reference Count: 200 Gillioz, M. Groeber, R. Kapuvari, A. Muehlleitner, M. DFG/SFB-TR9 Computational Particle Physics; Landesgraduiertenforderung des Landes Baden-Wurttembergs; Danish National Research Foundation [DNRF90] We would like to thank the ATLAS Exotics Group and in particular Mark Cooke and Merlin Davies for giving us access to the results of ATLAS searches for top partners. We also want to thank A. Azatov, A. Belyaev, R. Contino, L. Di Luzio, M. Serone, M. Spira and M. Wiebusch for helpful discussions, and C. Grojean for reading the draft. R.G. and M.M.are supported by the DFG/SFB-TR9 Computational Particle Physics. R.G. acknowledges financial support by the Landesgraduiertenforderung des Landes Baden-Wurttembergs. The CP3-Origins centre is partially funded by the Danish National Research Foundation, grant number DNRF90. 8 SPRINGER NEW YORK J HIGH ENERGY PHYS

PY - 2014

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N2 - Like many other models, Composite Higgs Models feature the existence of heavy vector-like quarks. Mixing effects between the Standard Model fields and the heavy states, which can be quite large in case of the top quark, imply deviations from the SM. In this work we investigate the possibility of heavy bottom partners. We show that they can have a significant impact on electroweak precision observables and the current Higgs results if there is a sizeable mixing with the bottom quark. We explicitly check that the constraints from the measurement of the CKM matrix element V-tb are fulfilled, and we test the compatibility with the electroweak precision observables. In particular we evaluate the constraint from the Z coupling to left-handed bottom quarks. General formulae have been derived which include the effects of new bottom partners in the loop corrections to this coupling and which can be applied to other models with similar particle content. Furthermore, the constraints from direct searches for heavy states at the LHC and from the Higgs search results have been included in our analysis. The best agreement with all the considered constraints is achieved for medium to large compositeness of the left-handed top and bottom quarks.

AB - Like many other models, Composite Higgs Models feature the existence of heavy vector-like quarks. Mixing effects between the Standard Model fields and the heavy states, which can be quite large in case of the top quark, imply deviations from the SM. In this work we investigate the possibility of heavy bottom partners. We show that they can have a significant impact on electroweak precision observables and the current Higgs results if there is a sizeable mixing with the bottom quark. We explicitly check that the constraints from the measurement of the CKM matrix element V-tb are fulfilled, and we test the compatibility with the electroweak precision observables. In particular we evaluate the constraint from the Z coupling to left-handed bottom quarks. General formulae have been derived which include the effects of new bottom partners in the loop corrections to this coupling and which can be applied to other models with similar particle content. Furthermore, the constraints from direct searches for heavy states at the LHC and from the Higgs search results have been included in our analysis. The best agreement with all the considered constraints is achieved for medium to large compositeness of the left-handed top and bottom quarks.

KW - Higgs Physics Beyond Standard Model Technicolor and Composite Models MINIMAL FLAVOR VIOLATION BOSON PRODUCTION QCD CORRECTIONS PROTON COLLIDERS HADRON COLLIDERS ELECTROWEAK CORRECTIONS RADIATIVE-CORRECTIONS VACUUM MISALIGNMENT STANDARD MODEL CROSS-SECTION

U2 - 10.1007/jhep03(2014)037

DO - 10.1007/jhep03(2014)037

M3 - Journal article

VL - 37

SP - 2

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

SN - 1126-6708

ER -