Complementarity of resonant scalar, vector-like quark and superpartner searches in elucidating new phenomena

Abstract

The elucidation of the nature of new phenomena requires a multi-pronged approach to understand the essential physics that underlies it. As an example, we study the simplified model containing a new scalar singlet accompanied by vector-like quarks, as motivated by the recent diphoton excess at the LHC. To be specific, we investigate three models with SU (2) L -doublet, vector-like quarks with Yukawa couplings to a new scalar singlet and which also couple off-diagonally to corresponding Standard Model fermions of the first or third generation through the usual Higgs boson. We demonstrate that three classes of searches can play important and complementary roles in constraining this model. In particular, we find that missing energy searches designed for superparticle production, supply superior sensitivity for vector-like quarks than the dedicated new quark searches themselves. CONTENTS

CheckMATE: Checkmating new physics at the LHC

“…[4]). Furthermore, analyses that target the high luminosity LHC run are now available for the first time and these have already been used in studies that estimate the exclusion and discovery reach of particular models (see e.g.…”

Revisiting vectorlike quark models with enhanced top Yukawa coupling

“…These experiments provide a reason for considering models based on strongly interacting theories. In this direction 2 , widely studied are vector-like quark (VLQ) models [9][10][11][12][13][14][15][16][17][18][19], the minimal composite Higgs models (MCHMs) [20,21], and the Little Higgs models [22,23].…”