Exotic Higgs decays into displaced jets at the LHeC

Cheung, Kingman, Fischer, Oliver ORCID: 0000-0003-2440-6411, Wang, Zeren Simon and Zurita, Jose (2021) Exotic Higgs decays into displaced jets at the LHeC. JOURNAL OF HIGH ENERGY PHYSICS, 2021 (2). 161-.

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Official URL: http://dx.doi.org/10.1007/jhep02(2021)161

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>Profiling the Higgs boson requires the study of its non-standard decay modes. In this work we discuss the prospects of the Large Hadron electron Collider (LHeC) to detect scalar particles with masses ,≳ 10 GeV produced from decays of the Standard Model (SM) Higgs boson. These scalar particles decay mainly to bottom pairs, and in a vast portion of the allowed parameter space they acquire a macroscopic lifetime, hence giving rise to displaced hadronic vertices. The LHeC provides a very clean environment that allows for easy identification of these final states, in contrast to hadronic colliders where the overwhelming backgrounds and high pile-up render such searches incredibly challenging. We find that the LHeC provides a unique window of opportunity to detect scalar particles with masses between 10 and 30 GeV. In the Higgs Portal scenarios we can test the mixing angle squared, sin<jats:sup>2</jats:sup><jats:italic>α</jats:italic>, as low as 10<jats:sup><jats:italic>−</jats:italic>5</jats:sup>–10<jats:sup><jats:italic>−</jats:italic>7</jats:sup>, with the exact value depending on the vacuum expectation value of the new scalar.</jats:p><jats:p>Our results are also presented in a model-independent fashion in the lifetime-branching ratio and mass-branching ratio planes. We have found that exotic branching ratios of the Higgs boson at the sub-percent level can be probed, for the scalar decay length in the range 10<jats:sup><jats:italic>−</jats:italic>4</jats:sup> m ≲ <jats:italic>cτ</jats:italic> ≲ 10<jats:sup><jats:italic>−</jats:italic>1</jats:sup> m. The expected coverage of the parameter space largely exceeds the published sensitivity of the indirect reach at the high-luminosity Large Hadron Collider via the invisible Higgs branching ratio.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	Beyond Standard Model, Higgs Physics
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	08 Jan 2021 16:02
Last Modified:	17 Mar 2024 10:54
DOI:	10.1007/JHEP02(2021)161
Open Access URL:	https://link.springer.com/article/10.1007%2FJHEP02...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3112517