Abstract
Lilith is a public Python library for constraining new physics from Higgs signal strength measurements. We here present version 2.0 of Lilith together with an updated XML database which includes the current ATLAS and CMS Run 2 Higgs results for 36 fb^{-1}−1. Both the code and the database were extended from the ordinary Gaussian approximation employed in Lilith-1.1 to using variable Gaussian and Poisson likelihoods. Moreover, Lilith can now make use of correlation matrices of arbitrary dimension. We provide detailed validations of the implemented experimental results as well as a status of global fits for reduced Higgs couplings, Two-Higgs-doublet models of Type I and Type II, and invisible Higgs decays. Lilith-2.0 is available on GitHub and ready to be used to constrain a wide class of new physics scenarios.
Highlights
The signal strength framework is based on the narrow-width approximation and on the assumption that new physics results only in the scaling of Standard Model (SM) Higgs processes
Results given in terms of signal strengths can be matched to new physics scenarios with the introduction of factors CX and CY that scale the amplitudes for the production and decay of the SM Higgs boson, respectively, as μ(X, Y ) =
We presented Lilith-2.0, a light and easy-to-use Python tool for constraining new physics from signal strength measurements of the 125 GeV Higgs boson
Summary
The LHC runs in 2010–2012 and 2015–2018 have led to a wealth of experimental results on the 125 GeV Higgs boson. Assessing the compatibility of a non-SM Higgs sector with the ATLAS and CMS results requires to construct a likelihood, which is a non-trivial task While this is best done by the experimental collaborations themselves, having at least an approximate global likelihood is very useful, as it allows theorists to pursue in-depth studies of the implications for their models. The signal strength framework is based on the narrow-width approximation and on the assumption that new physics results only in the scaling of SM Higgs processes.3 This makes it possible to combine the information from various measurements and assess the compatibility. Results given in terms of signal strengths can be matched to new physics scenarios with the introduction of factors CX and CY that scale the amplitudes for the production and decay of the SM Higgs boson, respectively, as μ(X , Y ) =. For everything else, including instructions how to use the code, we refer the reader to the original manual [1]
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