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Resolving the tensor structure of the Higgs coupling to $Z$-bosons via Higgs-strahlung

Authors :
Banerjee, Shankha
Gupta, Rick S.
Reiness, Joey Y.
Spannowsky, Michael
Source :
Phys. Rev. D 100, 115004 (2019)
Publication Year :
2019

Abstract

We propose differential observables for $pp \to Z(\ell^+\ell^-)h(b\bar{b})$ that can be used to completely determine the tensor structure of the $hZZ^*/hZ\bar{f}f$ couplings relevant to this process in the dimension-6 SMEFT. In particular, we propose a strategy to probe the anomalous $h Z_{\mu \nu}Z^{\mu \nu}$ and $h Z_{\mu \nu}\tilde{Z}^{\mu \nu}$ vertices at the percent level. We show that this can be achieved by resurrecting the interference term between the transverse $Zh$ amplitude, which receives contributions from the above couplings, and the dominant SM longitudinal amplitude. These contributions are hard to isolate without a knowledge of the analytical amplitude, as they vanish unless the process is studied differentially in three different angular variables at the level of the $Z$-decay products. By also including the differential distributions with respect to energy variables, we obtain projected bounds for the two other tensor structures of the Higgs coupling to $Z$-bosons.<br />Comment: v2: 9 pages, 2 figures and 2 tables; minor numerical corrections; conclusions unchanged; matches version published in PRD

Details

Database :
arXiv
Journal :
Phys. Rev. D 100, 115004 (2019)
Publication Type :
Report
Accession number :
edsarx.1905.02728
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevD.100.115004