If the weak were strong and the strong were weak

Lohitsiri, Nakarin; Tong, David

doi:10.21468/SciPostPhys.7.5.059

SciPost Physics

If the weak were strong and the strong were weak

Nakarin Lohitsiri, David Tong

SciPost Phys. 7, 059 (2019) · published 8 November 2019

doi: 10.21468/SciPostPhys.7.5.059
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Abstract

We explore the phase structure of the Standard Model as the relative strengths of the SU(2) weak force and SU(3) strong force are varied. With a single generation of fermions, the structure of chiral symmetry breaking suggests that there is no phase transition as we interpolate between the SU(3)-confining phase and the SU(2)-confining phase. Remarkably, the massless left-handed neutrino, familiar in our world, morphs smoothly into a massless right-handed down-quark. With multiple generations, a similar metamorphosis occurs, but now proceeding via a phase transition. In the second half of the paper we introduce a two-parameter extension of the Standard Model, a chiral gauge theory with gauge group U(1) x Sp(r) x SU(N). We again explore the phase structure of the theory as the relative strengths of the Sp(r) and SU(N) gauge couplings vary.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.7.5.059
TI  - If the weak were strong and the strong were weak
PY  - 2019/11/08
UR  - https://scipost.org/SciPostPhys.7.5.059
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 7
IS  - 5
SP  - 059
A1  - Lohitsiri, Nakarin
AU  - Tong, David
AB  - We explore the phase structure of the Standard Model as the relative strengths of the SU(2) weak force and SU(3) strong force are varied. With a single generation of fermions, the structure of chiral symmetry breaking suggests that there is no phase transition as we interpolate between the SU(3)-confining phase and the SU(2)-confining phase. Remarkably, the massless left-handed neutrino, familiar in our world, morphs smoothly into a massless right-handed down-quark. With multiple generations, a similar metamorphosis occurs, but now proceeding via a phase transition. In the second half of the paper we introduce a two-parameter extension of the Standard Model, a chiral gauge theory with gauge group U(1) x Sp(r) x SU(N). We again explore the phase structure of the theory as the relative strengths of the Sp(r) and SU(N) gauge couplings vary.
ER  -

@Article{10.21468/SciPostPhys.7.5.059,
	title={{If the weak were strong and the strong were weak}},
	author={Nakarin Lohitsiri and David Tong},
	journal={SciPost Phys.},
	volume={7},
	pages={059},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.7.5.059},
	url={https://scipost.org/10.21468/SciPostPhys.7.5.059},
}

Cited by 9

Ontology / Topics

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Down quark Gauge theory Standard Model

Authors / Affiliations: mappings to Contributors and Organizations

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¹ Nakarin Lohitsiri,
¹ ² David Tong

Funders for the research work leading to this publication

Ministry of Science and Technology of Thailand (through Organization: กระทรวงวิทยาศาสตร์และเทคโนโลยี / Ministry of Science and Technology Thailand [MOST])
Science and Technology Facilities Council [STFC]
Simons Foundation
Trinity College, University of Cambridge