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Title: Exotic electroweak signals in the twin Higgs model

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 11; Related Information: CHORUS Timestamp: 2017-06-29 22:11:45; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Cheng, Hsin-Chia, Salvioni, Ennio, and Tsai, Yuhsin. Exotic electroweak signals in the twin Higgs model. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.115035.
Cheng, Hsin-Chia, Salvioni, Ennio, & Tsai, Yuhsin. Exotic electroweak signals in the twin Higgs model. United States. doi:10.1103/PhysRevD.95.115035.
Cheng, Hsin-Chia, Salvioni, Ennio, and Tsai, Yuhsin. Thu . "Exotic electroweak signals in the twin Higgs model". United States. doi:10.1103/PhysRevD.95.115035.
title = {Exotic electroweak signals in the twin Higgs model},
author = {Cheng, Hsin-Chia and Salvioni, Ennio and Tsai, Yuhsin},
abstractNote = {},
doi = {10.1103/PhysRevD.95.115035},
journal = {Physical Review D},
number = 11,
volume = 95,
place = {United States},
year = {Thu Jun 29 00:00:00 EDT 2017},
month = {Thu Jun 29 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 29, 2018
Publisher's Accepted Manuscript

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Cited by: 5works
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  • We study the collider signatures of the left-right twin Higgs model in the case that the right-handed neutrino mass is less than the mass of the right-handed gauge boson. In this scenario, new leptonic decay chains open up, allowing the particles which cancel the one-loop quadratic divergences of the Higgs, the right-handed gauge bosons and top-partners, to be discovered. Half of these events contain same-sign leptons without missing energy, which have no genuine standard model background and for which the backgrounds are purely instrumental. These signals may be used to complement other collider searches and, in certain regions of parametermore » space, may be the only way to observe the particles responsible for natural electroweak symmetry breaking in the left-right twin Higgs model.« less
  • The Twin Higgs model provides a natural theory for the electroweak symmetry breaking without the need of new particles carrying the standard model gauge charges below a few TeV. In the low energy theory, the only probe comes from the mixing of the Higgs fields in the standard model and twin sectors. However, an ultraviolet completion is required below ~ 10 TeV to remove residual logarithmic divergences. In non-supersymmetric completions, new exotic fermions charged under both the standard model and twin gauge symmetries have to be present to accompany the top quark, thus providing a high energy probe of themore » model. Some of them carry standard model color, and may therefore be copiously produced at current or future hadron colliders. Once produced, these exotic quarks can decay into a top together with twin sector particles. If the twin sector particles escape the detection, we have the irreducible stop-like signals. On the other hand, some twin sector particles may decay back into the standard model particles with long lifetimes, giving spectacular displaced vertex signals in combination with the prompt top quarks. This happens in the Fraternal Twin Higgs scenario with typical parameters, and sometimes is even necessary for cosmological reasons. We study the potential displaced vertex signals from the decays of the twin bottomonia, twin glueballs, and twin leptons in the Fraternal Twin Higgs scenario. As a result, depending on the details of the twin sector, the exotic quarks may be probed up to ~ 2.5 TeV at the LHC and beyond 10 TeV at a future 100 TeV collider, providing a strong test of this class of ultraviolet completions.« less
  • We investigate the cosmology of the minimal model of neutral naturalness, the mirror Twin Higgs. The softly-broken mirror symmetry relating the Standard Model to its twin counterpart leads to significant dark radiation in tension with BBN and CMB observations. We quantify this tension and illustrate how it can be mitigated in several simple scenarios that alter the relative energy densities of the two sectors while respecting the softly-broken mirror symmetry. In particular, we consider both the out-of-equilibrium decay of a new scalar as well as reheating in a toy model of twinned inflation, Twinflation. In both cases the dilution ofmore » energy density in the twin sector does not merely reconcile the existence of a mirror Twin Higgs with cosmological constraints, but predicts contributions to cosmological observables that may be probed in current and future CMB experiments. This raises the prospect of discovering evidence of neutral naturalness through cosmology rather than colliders.« less