Basis-independent treatment of the complex 2HDM

Boto, Rafael; Fernandes, Tiago V.; Haber, Howard E.; Romão, Jorge C.; Silva, João P.

doi:10.1103/PhysRevD.101.055023

Title: Basis-independent treatment of the complex 2HDM

Journal Article · 20 March 2020 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.101.055023 · OSTI ID:1605635

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^[1]; Silva, João P. ^[1]

Instituto de Superior Tecnico (IST), Lisbon (Portugal). Centre for Theoretical and Particle Physics (CFTP)
Univ. of California, Santa Cruz, CA (United States). Santa Cruz Institute for Particle Physics

The complex 2HDM (C2HDM) is the most general CP-violating two-Higgs-doublet model that possesses a softly broken Z₂ symmetry. However, the physical consequences of the model cannot depend on the basis of scalar fields used to define it. Thus, to get a better sense of the significance of the C2HDM parameters, we have analyzed this model by employing a basis-independent formalism. This formalism involves transforming to the Higgs basis (which is defined up to an arbitrary complex phase) and identifying quantities that are invariant with respect to this phase degree of freedom. Using this method, we have obtained the constraints that enforce the softly broken Z₂ symmetry. One can then relate the C2HDM parameters to basis-independent quantities up to a twofold ambiguity. We then show how this remaining ambiguity is resolved. We also examine the possibility of spontaneous CP violation when the scalar potential of the C2HDM is explicitly CP conserving. Basis-independent constraints are presented that govern the presence of spontaneous CP violation.

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Research Organization:: Univ. of California, Santa Cruz, CA (United States). Santa Cruz Institute for Particle Physics

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE

Grant/Contract Number:: SC0010107

OSTI ID:: 1605635

Alternate ID(s):: OSTI ID: 1605653

Report Number(s):: SCIPP-19/01; PRVDAQ; TRN: US2104452

Journal Information:: Physical Review D, Vol. 101, Issue 5; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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References (62)

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Title: Basis-independent treatment of the complex 2HDM

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