Impact of CP -violating interference effects on MSSM Higgs searches

Elina Fuchs; Georg Weiglein

doi:https://doi.org/10.1140/epjc/s10052-018-5543-4

Impact of CP -violating interference effects on MSSM Higgs searches

Elina Fuchs, Georg Weiglein

Department of Particle Physics and Astrophysics

Weizmann Institute of Science

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

Abstract

Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states h, H, A into the mass eigenstates h₁, h₂, h₃ and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase ϕAt, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of τ-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons h₂ and h₃, strongly destructive interference effects between the contributions involving h₂ and h₃ leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected.

Original language	English
Article number	87
Number of pages	19
Journal	European Physical Journal C
Volume	78
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s10052-018-5543-4
State	Published Online - 30 Jan 2018

All Science Journal Classification (ASJC) codes

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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title = "Impact of CP -violating interference effects on MSSM Higgs searches",

abstract = "Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states h, H, A into the mass eigenstates h1, h2, h3 and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase ϕAt, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of τ-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons h2 and h3, strongly destructive interference effects between the contributions involving h2 and h3 leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected.",

author = "Elina Fuchs and Georg Weiglein",

note = "We would like to thank Oscar St{\aa}l for his help with HiggsBounds and valuable suggestions, and Christian Veelken, Sven Heinemeyer, Shruti Patel and Stefan Liebler for useful discussions. E. F. thanks the DESY theory group where a large part of this work was done. The work of E. F. was partially funded by the German National Academic Foundation and by DESY. The work of G. W. is supported in part by the Collaborative Research Centre SFB 676 of the DFG, “Particles, Strings and the Early Universe”, and by the European Commission through the “HiggsTools” Initial Training Network PITN-GA-2012-316704.",

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T1 - Impact of CP -violating interference effects on MSSM Higgs searches

AU - Fuchs, Elina

AU - Weiglein, Georg

N1 - We would like to thank Oscar Stål for his help with HiggsBounds and valuable suggestions, and Christian Veelken, Sven Heinemeyer, Shruti Patel and Stefan Liebler for useful discussions. E. F. thanks the DESY theory group where a large part of this work was done. The work of E. F. was partially funded by the German National Academic Foundation and by DESY. The work of G. W. is supported in part by the Collaborative Research Centre SFB 676 of the DFG, “Particles, Strings and the Early Universe”, and by the European Commission through the “HiggsTools” Initial Training Network PITN-GA-2012-316704.

PY - 2018/1/30

Y1 - 2018/1/30

N2 - Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states h, H, A into the mass eigenstates h1, h2, h3 and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase ϕAt, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of τ-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons h2 and h3, strongly destructive interference effects between the contributions involving h2 and h3 leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected.

AB - Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states h, H, A into the mass eigenstates h1, h2, h3 and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase ϕAt, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of τ-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons h2 and h3, strongly destructive interference effects between the contributions involving h2 and h3 leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected.

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DO - https://doi.org/10.1140/epjc/s10052-018-5543-4

M3 - مقالة

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 87

ER -

Impact of CP -violating interference effects on MSSM Higgs searches

Abstract

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