Aligned Yet Large Dipoles: a SMEFT Study

Bonnefoy, Quentin; Yao, Chang Yuan; Liu, Di; Kley, Jonathan; Rossia

Preprint

PUBDB-2024-01122

Aligned Yet Large Dipoles: a SMEFT Study

Bonnefoy, Q.DESY* ; Kley, J.Extern*DESY* ; Liu, D. (Corresponding author)DESY* ; Rossia ; Yao, C. Y.Extern*DESY*

2024

[10.3204/PUBDB-2024-01122]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-01122

Report No.: COMETA-2024-004; DESY-24-033; HU-EP-24/09; LAPTH-011/24; arXiv:2403.13065

Abstract: We study a non-universal flavor scenario at the level of the Standard Model Effective Field Theory, according to which the matrix of Wilson coefficients $c_{uW}$ of an up-type electroweak quark dipole operator is aligned with the up-type Yukawa coupling. Such an alignment usually follows from the assumption of Minimal Flavor Violation (MFV), away from which we step by allowing the entries of $c_{uW}$ to be sizable along the first quark generations. A particular example, which we refer to as ``inverse hierarchy MFV', features Wilson coefficients inversely proportional to quark masses, and arises from BSM models respecting MFV and containing heavy fields that replicate the mass hierarchy of SM quarks. We then analyze the phenomenology driven by $c_{uW}$ at colliders and at lower-energy flavor experiments. We show that precision measurements of the process $pp\rightarrow W h\rightarrow \gamma\gamma\ell\nu$ at FCC-$hh$ could set an upper bound on $|c_{uW}|\lesssim\mathcal{O}(10^{-2})(\Lambda/{\rm TeV})^{2}$, with $\Lambda$ the cutoff of the effective field theory. This bound is an order of magnitude stronger than the existing LHC bounds. Moreover, we estimate that $W h\rightarrow b\bar b \ell\nu$ at HL-LHC could also give competitive bounds. In the low-energy regime, we consider bounds arising from rare kaon decays, which turn out to be loose, $|c_{uW}^{11}|<\mathcal{O}(1)(\Lambda/{\rm TeV})^{2}$. We finally demonstrate that our flavor and operator assumptions can be derived from a weakly-coupled UV model, which we choose to simultaneously illustrate the UV origin of inverse hierarchy MFV.

Keyword(s): new physics ; effective field theory ; operator: dipole ; flavor: violation: minimal ; CERN LHC Coll: upgrade ; FCC-hh ; p p: scattering ; Higgs particle: production ; W: production ; electroweak interaction ; p p --> W Higgs particle ; W Higgs particle --> bottom anti-bottom lepton neutrino

Note: I couldn't enter the following grants that we acknowledge in the paper:Grants No. NSFC-11975130, No. NSFC-12035008, No. NSFC-12047533, the National Key Research and Development Program of China under Grant No. 2017YFA0402200, the China Postdoctoral Science Foundation under Grant No. 2018M641621 and the Helmholtz-OCPC International Postdoctoral Exchange Fellowship ProgramDOE Early Career Grant DESC0019225starting grant of the French Ministère de l’Enseignement supérieur et de la RechercheEuropean Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 949451) and a Royal Society University Research Fellowship through grant URF/R1/201553funding from the French Programme d’investissements d’avenir through the Enigmass LabexSee also the acknowledgements of the paper.

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