Angles on CP-violation in Higgs boson interactions

Florian U. Bernlochner; Christoph Englert; Chris Hays; Kristin Lohwasser; Hannes Mildner; Andrew Pilkington; Darren D. Price; Michael Spannowsky

doi:10.1016/j.physletb.2019.01.043

Angles on CP-violation in Higgs boson interactions

Florian U. Bernlochner, Christoph Englert, Chris Hays, Kristin Lohwasser, Hannes Mildner, Andrew Pilkington^*, Darren D. Price, Michael Spannowsky

^*Corresponding author for this work

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

Abstract

CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of O(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

Original language	English
Pages (from-to)	372-379
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	790
Early online date	28 Jan 2019
DOIs	https://doi.org/10.1016/j.physletb.2019.01.043
Publication status	Published - 10 Mar 2019

Keywords

CP-violation
Effective field theory
Higgs boson
LHC

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10.1016/j.physletb.2019.01.043Licence: CC BY

Cite this

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title = "Angles on CP-violation in Higgs boson interactions",

abstract = "CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of O(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.",

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author = "Bernlochner, {Florian U.} and Christoph Englert and Chris Hays and Kristin Lohwasser and Hannes Mildner and Andrew Pilkington and Price, {Darren D.} and Michael Spannowsky",

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T1 - Angles on CP-violation in Higgs boson interactions

AU - Bernlochner, Florian U.

AU - Englert, Christoph

AU - Hays, Chris

AU - Lohwasser, Kristin

AU - Mildner, Hannes

AU - Pilkington, Andrew

AU - Price, Darren D.

AU - Spannowsky, Michael

PY - 2019/3/10

Y1 - 2019/3/10

N2 - CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of O(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

AB - CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of O(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

KW - CP-violation

KW - Effective field theory

KW - Higgs boson

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JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Angles on CP-violation in Higgs boson interactions

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