Exploring new possibilities to discover a light pseudo-scalar at LHCb

Abstract

We study the possibility of observing a light pseudo-scalar $a$ at LHCb. We target the mass region $1\lesssim m_a\lesssim 60$ GeV and various decay channels, some of which have never been considered before: muon pairs, tau pairs, $D$ meson pairs, and di-photon. We interpret the results in the context of models of 4D Composite Higgs and Partial Compositeness in particular.

15 pages, 13 figures, 6 tables. Final version published in EPJC

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• Triple parton scatterings in high-energy proton-proton collisions
• Measurement of $CP$ violation in $B^0\to D^{+}{D}^{-}$ decays

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• Searches for axion-like particles via $\gamma \gamma$ fusion at future ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ colliders
• Prospects for detecting axion-like particles via the decay $Z\to af\bar{f}$ at future $Z$ factories
• Coloured spin-1 states in composite Higgs models
• Partial compositeness under precision scrutiny
• Prospects for sub-EW-scale ALP searches via $\gamma +b\bar{b}$ signatures at the LHC using jet substructure techniques
• Electroweak spin-1 resonances in Composite Higgs models
• Searching for long-lived axion-like particles via displaced vertices at the HL-LHC
• Following the muon track of hierarchical sectors at LHCb
• The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays
• How to use Machine Learning to improve the discrimination between signal and background at particle colliders