6–11 Jul 2025
PALAIS DU PHARO, Marseille, France
Europe/Paris timezone

Beautiful Majorana Higgses at Colliders

9 Jul 2025, 17:15
15m
PALAIS DU PHARO, Marseille, France

PALAIS DU PHARO, Marseille, France

Parallel T09 - Beyond the Standard Model T09

Speaker

Jonathan Kriewald (Jožef Stefan Institute)

Description

We investigate a novel collider signature within the minimal Left-Right Symmetric Model, featuring a Higgs sector composed of a bi-doublet and two triplets. Our study focuses on a region of the parameter space where the $SU(2)_R$ charged gauge boson $W_R$ lies in the multi-TeV regime (3-100 TeV) and the additional Higgs states play a significant role. In this scenario, a heavy neutral Higgs boson $\Delta$ with a dominant $SU(2)_R$ triplet component can be produced in association with either a Standard Model Higgs boson or a massive weak boson. The subsequent decay of the heavy Higgs into Majorana neutrinos $N$ results in displaced lepton signatures, providing a striking manifestation of lepton number violation. Additionally, we explore how the production of $b$-jets in these processes can enhance hadron-collider sensitivity to such signals. A particularly compelling channel, $pp \to b \bar b NN$, offers the exciting possibility of simultaneously probing the spontaneous mass origin of both Dirac fermions and Majorana states. Based on an optimised event selection strategy and state-of-the-art Monte Carlo simulations, we outline the expected reach at the HL-LHC and future colliders. Our findings demonstrate that this channel probes a region of parameter space where the neutral Higgs triplet and heavy neutrino masses are relatively light ($m_\Delta \lesssim 250$ GeV, $m_N \lesssim 80$ GeV), indirectly constraining the $W_R$ boson to the deep multi-TeV domain, with sensitivity extending up to 70-80 TeV, effectively turning the LHC into a precision machine.

Author

Jonathan Kriewald (Jožef Stefan Institute)

Co-authors

Prof. Benjamin Fuks (LPTHE Paris / Sorbonne Université) Fabrizio Nesti (Università dell'Aquila/INFN Gran Sasso) Miha Nemevšek (Jožef Stefan Institute / Univerza Ljubljana FMF)

Presentation materials

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