# Phenomenology 2017 Symposium

May 8 – 10, 2017
University of Pittsburgh
US/Eastern timezone

## SMEFT, extended scalar sectors, double Higgs production, and all that

May 8, 2017, 5:15 PM
15m
G-29 (Benedum Hall)

parallel talk

### Speaker

Christopher Murphy (Brookhaven National Laboratory)

### Description

One of the simplest extensions of the Standard Model is the inclusion of an additional scalar multiplet, and we consider
scalars
in the $SU(2)_L$ singlet, triplet, and quartet representations. We
consider models with heavy neutral scalars, $m_H\sim 1-2$ TeV, and the matching of the UV complete theories to
the low energy effective field theory. We demonstrate the
agreement of the kinematic distributions obtained in the singlet models for the gluon fusion of a Higgs pair
with the predictions of the effective field theory at $\sqrt{S} = 13$ and $100$ TeV.
The restrictions on the extended scalar sectors due to perturbative unitarity and precision electroweak measurements are
summarized and lead to highly restricted regions of viable parameter space for the triplet and quartet models.

### Primary author

Christopher Murphy (Brookhaven National Laboratory)

### Co-author

Sara Lynn Dawson (Brookhaven National Laboratory (US))