Naturalness in the Dark at the LHC

Craig, Nathaniel; Strassler, Matt; Katz, Andrey; Sundrum, Raman

doi:10.1007/JHEP07(2015)105

Article
Report number	arXiv:1501.05310 ; UMD-PP-014-028 ; CERN-PH-TH-2014-263 ; UMD-PP-014-028 ; CERN-PH-TH-2014-263
Title	Naturalness in the Dark at the LHC
Author(s)	Craig, Nathaniel (UC, Santa Barbara) ; Katz, Andrey (CERN ; Harvard U., Phys. Dept. ; Geneva U., CAP) ; Strassler, Matt (Harvard U., Phys. Dept.) ; Sundrum, Raman (Maryland U.)
Publication	2015-07-21
Imprint	21 Jan 2015
Number of pages	64
Note	64 pages, 10 figures; v2: minor changes, references added
In:	JHEP 07 (2015) 105
DOI	10.1007/JHEP07(2015)105
Subject category	Particle Physics - Phenomenology
Abstract	We revisit the Twin Higgs scenario as a "dark" solution to the little hierarchy problem, identify the structure of a minimal model and its viable parameter space, and analyze its collider implications. In this model, dark naturalness generally leads to Hidden Valley phenomenology. The twin particles, including the top partner, are all Standard-Model-neutral, but naturalness favors the existence of twin strong interactions -- an asymptotically-free force that confines not far above the Standard Model QCD scale -- and a Higgs portal interaction. We show that, taken together, these typically give rise to exotic decays of the Higgs to twin hadrons. Across a substantial portion of the parameter space, certain twin hadrons have visible and often displaced decays, providing a potentially striking LHC signature. We briefly discuss appropriate experimental search strategies.
Copyright/License	preprint: © 2014-2025 CERN (License: CC-BY-3.0) publication: © 2015-2025 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

$Example of a Twin Higgs collider event. The SM-like Higgs decays through a loop of the twin tops into a pair of twin gluons, which subsequently hadronize to produce various twin glueballs. While some glueballs are stable at the collider scale, $\zpp$ decay to Standard Model particles is sufficiently fast to give LHC-observable effects, including possible displaced vertices. The $h\gtwin\gtwin$ coupling, indicated by a black dot, is generated by small mixing of the Higgs and the twin Higgs.$

$The confinement scale $\hat \Lambda_3$ of the twin $SU(3)$ coupling given fractional variations in $\hat g_3$ and $\hat y_b$ at the cutoff $\Lambda$ for the minimal Twin Higgs (dependence on $\hat y_t$ is negligible). Here we take $\Lambda = 10 \hat m_t$ and $f = 3v$. The mild kinks are due to the $\hat b$ threshold.$ Show more plots

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