Triple-gauge couplings in LHC diboson production: a SMEFT view from every angle

El Faham, Hesham; Pelliccioli, Giovanni; Vryonidou, Eleni

doi:10.1007/jhep08(2024)087

J. High Energ. Phys.

2024

DOI: 10.1007/jhep08(2024)087

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Triple-gauge couplings in LHC diboson production: a SMEFT view from every angle

Hesham El Faham,

Giovanni Pelliccioli,

Eleni Vryonidou

Abstract: This study explores fully leptonic WZ and WW production at the LHC within the SMEFT framework at NLO in QCD, focusing on both CP-even and CP-odd triple-gauge-coupling dimension-six operators. We investigate the off-shell processes, contrasting our findings in inclusive setups with those in the presence of realistic fiducial selections. Alongside the conventional kinematic observables, we examine polarisation-sensitive observables and angular coefficients. Moreover, we assess potential SMEFT effects on asymmetr… Show more

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Cited by 4 publications

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CP-odd effects at NLO in SMEFT WH and ZH production

Rossia,

Vryonidou

2024

J. High Energ. Phys.

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CP-violation (CPV) is a rare phenomenon in the Standard Model whilst there is compelling indirect evidence for additional CPV sources in the Universe. The search for CPV effects at the LHC is thus one of the best-motivated precision tests of the Standard Model (SM) and an excellent probe of New Physics. NLO QCD corrections can affect the predictions for those measurements substantially. We study the impact of NLO QCD corrections in WH and ZH production in the Standard Model Effective Field Theory with bosonic CP-odd dimension-6 operators. We analyze the angular distributions at LO of those processes that can be used to probe CPV effects. We then show how NLO QCD effects modify those distributions. We encounter that the corrections have a clear angular dependence and differ between the SM, the dimension-6 squared and their interference, emphasising the need for an exact inclusion of NLO QCD in precision computations. We then perform a phenomenological analysis of WH production at the LHC to study the impact of NLO QCD effects on the projected bounds on the CP-odd Wilson Coefficient $$ {c}_{\varphi \overset{\sim }{W}} $$ c φ W ~ . NLO QCD effects in the signal improve the bounds by ∼ 10% but reduce the significance of the interference.

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CP-odd effects at NLO in SMEFT WH and ZH production

Rossia,

Vryonidou

2024

J. High Energ. Phys.

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Triboson production in the SMEFT

Celada,

Durieux,

Mimasu

et al. 2024

J. High Energ. Phys.

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We study the production of three electroweak gauge bosons at the LHC, in the effective field theory of the standard model, at dimension six and next-to-leading order in QCD. We present results for inclusive cross-sections and differential distributions, finding that these QCD corrections are large, often vary across the phase-space and notably differ from those observed in the standard model. We then explore the potential of the recently observed triboson production processes for improving the sensitivity brought by electroweak precision observables and diboson data. The additional sensitivity we observe is dominated by resonant Higgs boson contributions, with decays to photon pairs in particular. A global analysis including Higgs boson data is therefore needed for a fair assessment of the future reach of triboson measurements on heavy new physics.

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Electroweak corrections and EFT operators in W+W− production at the LHC

Banerjee,

Reichelt,

Spannowsky

2024

Phys. Rev. D

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We investigate the impact of electroweak corrections and effective field theory operators on W+W− production at the Large Hadron Collider (LHC). Utilizing the Standard Model effective-field theory (SMEFT) framework, we extend the Standard Model by incorporating higher-dimensional operators to encapsulate potential new physics effects. These operators allow for a model-independent approach to data interpretation, essential for probing beyond the Standard Model physics. We generate pseudodata at the next-to-leading order in quantum chromodynamics and include approximate electroweak corrections. Our analysis focuses on the interplay between these corrections and SMEFT operators at leading order. The inclusion of electroweak corrections is crucial as they can counteract the effects predicted by SMEFT operators, necessitating precise theoretical and experimental handling. By examining pp→W+W− production, a process sensitive to the electroweak symmetry-breaking mechanism, we demonstrate the importance of these corrections in isolating and interpreting new physics signatures. Our results highlight the significant role of electroweak corrections in enhancing the interpretative power of LHC data and in obtaining reliable constraints on new physics interactions. Published by the American Physical Society 2024

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Triple-gauge couplings in LHC diboson production: a SMEFT view from every angle

Cited by 4 publications

References 87 publications

CP-odd effects at NLO in SMEFT WH and ZH production

CP-odd effects at NLO in SMEFT WH and ZH production

Triboson production in the SMEFT

Electroweak corrections and EFT operators in W+W− production at the LHC

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