CMS-PAS-FTR-22-006

CMS-PAS-FTR-22-006
Prospects for a Search for Doubly Charged Higgs Bosons at the HL-LHC
CMS Collaboration
May 2022

Abstract: A variety of new physics theories, including left-right symmetric and type-II seesaw models, predict a massive, TeV-scale, doubly charged Higgs-like particle. These can be pair-produced in hadronic interactions via a Drell-Yan-like mechanism and decay to a pair of like-sign muons or electrons. We present an analysis based on simulated DELPHES events with the Phase-2 CMS detector at the High-Luminosity LHC. This analysis estimates a lower expected exclusion mass limit of 1400 GeV at 95% CL for a doubly charged Higgs boson decaying into a pair of electrons or muons.
Links: CDS record (PDF) ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: The Feynman diagram for $H^{\pm \pm}$ production and subsequent decay.
png pdf	Figure 2: Two-dimensional plots of SSDL masses of positively charged leptons on the horizontal axis and negatively charged leptons on the vertical axis. The top plot is for $H^{\pm \pm}$ events with $m=700$ GeV and the bottom plot is for QCD events with a scalar sum of $p_{\mathrm{T}}$ greater than 2000 GeV, which is one prominent background process.
png	Figure 2-a: Two-dimensional plots of SSDL masses of positively charged leptons on the horizontal axis and negatively charged leptons on the vertical axis. The top plot is for $H^{\pm \pm}$ events with $m=700$ GeV and the bottom plot is for QCD events with a scalar sum of $p_{\mathrm{T}}$ greater than 2000 GeV, which is one prominent background process.
png	Figure 2-b: Two-dimensional plots of SSDL masses of positively charged leptons on the horizontal axis and negatively charged leptons on the vertical axis. The top plot is for $H^{\pm \pm}$ events with $m=700$ GeV and the bottom plot is for QCD events with a scalar sum of $p_{\mathrm{T}}$ greater than 2000 GeV, which is one prominent background process.
png pdf	Figure 3: Limits, at 95% CL, of the product of the cross section times branching fraction as a function of the Higgs mass when the $H^{\pm \pm}$ decays only to electrons (top) or muons (bottom).
png pdf	Figure 3-a: Limits, at 95% CL, of the product of the cross section times branching fraction as a function of the Higgs mass when the $H^{\pm \pm}$ decays only to electrons (top) or muons (bottom).
png pdf	Figure 3-b: Limits, at 95% CL, of the product of the cross section times branching fraction as a function of the Higgs mass when the $H^{\pm \pm}$ decays only to electrons (top) or muons (bottom).

Tables
png pdf	Table 1: Expected event yield for 3000 fb $^{-1}$ , assuming 100% branching ratio to electrons.

Summary

The obtained limits compare favorably to the latest Run II ATLAS results [5] when scaled to the same luminosity. This proves the robustness of the present analysis and shows that this search will benefit greatly from the HL-LHC.

References
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