Abstract
We study the possibility of observing a light pseudo-scalar a at LHCb. We target the mass region 2.5,mathrm{GeV}lesssim m_alesssim 60,mathrm{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.
Highlights
The search for resonantly produced particles Beyond the Standard Model (BSM) is a high-priority goal at the LHC
A light spin-0 state could emerge in many BSM scenarios like supersymmetry, Higgs sector extensions, and models based on composite dynamics
Light pseudo-scalar particles are present in many Standard Model extensions
Summary
The search for resonantly produced particles Beyond the Standard Model (BSM) is a high-priority goal at the LHC. Many searches focus on resonant production and decays into di-bosons (see, e.g., [1,2]) or di-fermions (see, e.g., [3–5]) in the high-mass region. This has led the LHC experiments to push the exclusion to mass scales, in most cases, well above the TeV. A light spin-0 state could emerge in many BSM scenarios like supersymmetry, Higgs sector extensions, and models based on composite dynamics. A pseudo-scalar a with a mass much lighter than the BSM scale is naturally realized as pseudo-Nambu–Goldstone boson (pNGB) associated with the spontaneous breaking of an approximate global symmetry. Other models of different nature featuring a light pNGB fall under the generic class of models of axion-like particles (ALPs) [26,27].
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