C P violation from tau , t and b dimension-6 Yukawa couplings - interplay of baryogenesis, EDM and Higgs physics

Elina Fuchs; Marta Losada; Yosef Nir; Yehonatan Viernik

doi:10.1007/JHEP05(2020)056

C P violation from tau , t and b dimension-6 Yukawa couplings - interplay of baryogenesis, EDM and Higgs physics

Elina Fuchs^*, Marta Losada, Yosef Nir, Yehonatan Viernik

^*Corresponding author for this work

Department of Particle Physics and Astrophysics

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

We explore the implications of the Standard Model effective field theory (SMEFT) with dimension-six terms involving the Higgs boson and third-generation fermion fields on the rate of Higgs boson production and decay into fermions, on the electric dipole moments (EDMs) of the electron, and on the baryon asymmetry of the Universe. We study the consequences of allowing these additional terms for each flavor separately and for combinations of two flavors. We find that a complex tau Yukawa coupling can account for the observed baryon asymmetry YBobs within current LHC and EDM bounds. A complex b (t) Yukawa coupling can account for 4% (2%) of YBobs, whereas a combination of the two can reach 12%. Combining tau with either t or b enlarges the viable parameter space owing to cancellations in the EDM and in either Higgs production times decay or the total Higgs width, respectively. Interestingly, in such a scenario there exists a region in parameter space where the SMEFT contributions to the electron EDM cancel and collider signal strengths are precisely SM-like, while producing sufficient baryon asymmetry. Measuring C P violation in Higgs decays to tau leptons is the smoking gun for this scenario.

Original language	English
Article number	56
Number of pages	26
Journal	Journal of High Energy Physics
Volume	2020
Issue number	5
DOIs	https://doi.org/10.1007/JHEP05(2020)056
Publication status	Published - 12 May 2020

Funding

We are grateful to Jorinde van de Vis for very helpful discussions. We thank Daniel Aloni for interesting discussions during the early stage of this work and the Fermilab and Cornell theory seminar audiences for stimulating comments. ML would like to deeply thank the Weizmann Institute of Science for its hospitality during the completion of this work. EF was supported by the Minerva Foundation. YN is the Amos de-Shalit chair of theoretical physics, and is supported by grants from the Israel Science Foundation (grant number 394/16), the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel (grant number 2014230), and the Yeda-Sela (YeS) Center for Basic Research.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1007/JHEP05(2020)056Licence: CC BY

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abstract = "We explore the implications of the Standard Model effective field theory (SMEFT) with dimension-six terms involving the Higgs boson and third-generation fermion fields on the rate of Higgs boson production and decay into fermions, on the electric dipole moments (EDMs) of the electron, and on the baryon asymmetry of the Universe. We study the consequences of allowing these additional terms for each flavor separately and for combinations of two flavors. We find that a complex tau Yukawa coupling can account for the observed baryon asymmetry YBobs within current LHC and EDM bounds. A complex b (t) Yukawa coupling can account for 4% (2%) of YBobs, whereas a combination of the two can reach 12%. Combining tau with either t or b enlarges the viable parameter space owing to cancellations in the EDM and in either Higgs production times decay or the total Higgs width, respectively. Interestingly, in such a scenario there exists a region in parameter space where the SMEFT contributions to the electron EDM cancel and collider signal strengths are precisely SM-like, while producing sufficient baryon asymmetry. Measuring C P violation in Higgs decays to tau leptons is the smoking gun for this scenario.",

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AB - We explore the implications of the Standard Model effective field theory (SMEFT) with dimension-six terms involving the Higgs boson and third-generation fermion fields on the rate of Higgs boson production and decay into fermions, on the electric dipole moments (EDMs) of the electron, and on the baryon asymmetry of the Universe. We study the consequences of allowing these additional terms for each flavor separately and for combinations of two flavors. We find that a complex tau Yukawa coupling can account for the observed baryon asymmetry YBobs within current LHC and EDM bounds. A complex b (t) Yukawa coupling can account for 4% (2%) of YBobs, whereas a combination of the two can reach 12%. Combining tau with either t or b enlarges the viable parameter space owing to cancellations in the EDM and in either Higgs production times decay or the total Higgs width, respectively. Interestingly, in such a scenario there exists a region in parameter space where the SMEFT contributions to the electron EDM cancel and collider signal strengths are precisely SM-like, while producing sufficient baryon asymmetry. Measuring C P violation in Higgs decays to tau leptons is the smoking gun for this scenario.

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C P violation from tau , t and b dimension-6 Yukawa couplings - interplay of baryogenesis, EDM and Higgs physics

Abstract

Funding

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