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Higgs Bosons and Supersymmetry in High Energy Physics

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Dr. Thomas Gajdosik

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Guest Editor

Institute of Theoretical Physics and Astronomy, Faculty of Physics, Vilnius University, Saulėtekio av. 3, 10257 Vilnius, Lithuania
Interests: theoretical particle physics phenomenology

Dr. Darius Jurčiukonis

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Guest Editor

Institute of Theoretical Physics and Astronomy, University of Vilnius, Saulėtekio av. 3, LT-10222 Vilnius, Lithuania
Interests: nonlinear particle models (solitons); research of higgs and neutrino sectors; physics beyond the standard model; nuclear physics

Dr. Vytautas Dūdėnas

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Guest Editor

Institute of Theoretical Physics and Astronomy, Faculty of Physics, Vilnius University, 9 Saultėkio, LT-10222 Vilnius, Lithuania
Interests: quantum field theory renormalization; beyond standard model physics

Special Issue Information

Dear Colleagues,

The standard model of particle physics is currently the most accurate paradigm for understanding of our world on the smallest scales under everyday conditions. The standard model itself has the Higgs mechanism at its core with the notion of a vaccum that exhibits the symmetries of the Lorentz group.

The formulation of the standard model relies on the implementation of various gauge symmetries and the spontaneous breaking of some of them by the choice of the parametrization of the vaccuum. It then describes all particles as the quantum excitations of the fundamental fields that are written in the representations of the gauge groups. This leads to the predictions of the standard model using the tools of quantum field theory.

Quantum field theory requires the concept of renormalization, even if the standard model is viewed only as an effective field theory and not as the ultimate theory of nature. The procedure of renormalization must then respect the unbroken symmetries of the description of nature.

One example of underlying symmetry that motivates the notion of viewing the standard model as an effective field theory is supersymmetry. One can assume that supersymmetry represents the broken symmetry of nature and provides the standard model with the low-energy limit effective field theory, which results in restrictions for the parametrization of "beyond the SM" physics and even provides a "prediction" for the mass of the Higgs particle that was found in 2012.

This Special issue aims to explore and explain the constraints that symmetries enforce on the description of nature, specifically on the scalar sector of the standard model and its possible extensions.

Dr. Thomas Gajdosik
Dr. Darius Jurčiukonis
Dr. Vytautas Dūdėnas
Guest Editors

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Research

24 pages, 1262 KiB

Open AccessArticle

Prospects for Charged Higgs Bosons in Natural SUSY Models at the High-Luminosity LHC

by Howard Baer, Vernon Barger, Xerxes Tata and Kairui Zhang

Symmetry 2023, 15(8), 1475; https://doi.org/10.3390/sym15081475 - 25 Jul 2023

Viewed by 929

Abstract

We continue our examination of prospects for the discovery of heavy Higgs bosons of natural SUSY (natSUSY) models at the high luminosity LHC (HL-LHC), this time focusing on charged Higgs bosons. In natSUSY, higgsinos are expected at the few hundred GeV scale whilst [...] Read more.

H^{\pm}

could range up tens of TeV without jeopardizing naturalness. For TeV-scale heavy SUSY Higgs bosons H, A and

H^{\pm}

, as currently required by LHC searches, SUSY decays into gaugino plus higgsino can dominate

H^{\pm}

decays provided these decays are kinematically accessible. The visible decay products of higgsinos are soft making them largely invisible, whilst the gauginos decay to W, Z or h plus missing transverse energy (

\frac{E}{T}

). Charged Higgs bosons are dominantly produced at LHC14 via the parton subprocess,

g b \to H^{\pm} t

. In this paper, we examine the viability of observing signatures from

H^{\pm} \to τ ν

H^{\pm} \to t b

and

H^{\pm} \to W, Z, h + \frac{E}{T}

events produced in association with a top quark at the HL-LHC over large Standard Model (SM) backgrounds from (mainly)

t \bar{t}

t \bar{t} V

and

t \bar{t} h

production (where

V = W, Z

). We find that the greatest reach is found via the SM

H^{\pm} (\to τ ν) + t

channel with a subdominant contribution from the

H^{\pm} (\to t b) + t

channel. Unlike for neutral Higgs searches, the SUSY decay modes appear to be unimportant for

H^{\pm}

searches at the HL-LHC. We delineate regions of the

m_{A}

vs.

tan β

plane, mostly around

m_{A} \sim

1–2 TeV, where signals from charged Higgs bosons would serve to confirm signals of a heavy, neutral Higgs boson at the

5 σ

level or, alternatively, to exclude heavy Higgs bosons at the 95% confidence level at the high luminosity LHC. Full article

(This article belongs to the Special Issue Higgs Bosons and Supersymmetry in High Energy Physics)

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