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Article
Report number	arXiv:1706.03783
Title	Compilation of low-energy constraints on 4-fermion operators in the SMEFT
Related title	Compilation of low-energy constraints on 4-fermion operators in the SMEFT
Author(s)	Falkowski, Adam (Orsay, LPT) ; González-Alonso, Martín (Lyon, IPN ; CERN) ; Mimouni, Kin (ITPP, Lausanne)
Publication	2017-08-28
Imprint	2017-06-12
Number of pages	40
Note	39 pages; full correlation matrix and likelihood function available in Mathematica notebook at https://www.dropbox.com/s/26nh71oebm4o12k/SMEFTlikelihood.nb?dl=0 v2: comments and references added, translation to Warsaw basis provided in notebook; v3: references added
In:	JHEP 1708 (2017) pp.123
DOI	10.1007/JHEP08(2017)123 10.1007/JHEP08(2017)123
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	We compile information from low-energy observables sensitive to flavor-conserving 4-fermion operators with two or four leptons. Our analysis includes data from e+e- colliders, neutrino scattering on electron or nucleon targets, atomic parity violation, parity-violating electron scattering, and the decay of pions, neutrons, nuclei and tau leptons. We recast these data as tree-level constraints on 4-fermion operators in the Standard Model Effective Field Theory (SMEFT) where the SM Lagrangian is extended by dimension-6 operators. We allow all independent dimension-6 operators to be simultaneously present with an arbitrary flavor structure. The results are presented as a multi-dimensional likelihood function in the space of dimension-6 Wilson coefficients, which retains information about the correlations. In this form, the results can be readily used to place limits on masses and couplings in a large class of new physics theories.
Copyright/License	arXiv nonexclusive-distrib. 1.0

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