Abstract
We study the phenomenology of light spin-0 particles and stress that they can be efficiently searched for at the LHCb experiment in the form of dimuon resonances. Given the large production cross sections in the forward rapidity region together with the efficient triggering and excellent mass resolution, it is argued that LHCb can provide unique sensitivity to such states. We illustrate our proposal using the recent measurement of Upsilon production by LHCb, emphasising the importance of mixing effects in the bottomonium resonance region. The implications for dimuon decays of spin-0 bottomonium states are also briefly discussed.
Highlights
The presence of scalar particles is known to be tightly related to the phenomenon of symmetry breaking
The generic bounds on new light spin-0 states presented in the previous section can be interpreted within ultraviolet complete new physics models such as THDM scenarios or the next-to-minimal supersymmetric standard model (SM)
One observes that the existing analyses of dimuon and ditau final states provide stringent constraints on the THDMII in almost the entire low-mA mass range, with our recast of the recent LHCb ΥðnÞ production measurement furnishing the dominant restriction for mA ∈ 1⁄28.6; 11 GeV
Summary
The presence of scalar particles is known to be tightly related to the phenomenon of symmetry breaking. The role of scalar degrees of freedom in fundamental theories has been of lasting interest in both experimental and theoretical physics These efforts have been refocused with the discovery of the Higgs boson, the measured properties of which [1,2] suggest that it provides the dominant source of the breaking of both the electroweak (EW) and flavor symmetries of the standard model (SM). Similar to the SM Higgs, such resonances tend to decay to the heaviest kinematically allowed final state and can be abundantly produced in hadronic highenergy collisions through loop-induced gluon-gluon fusion, provided they couple to quarks and are sufficiently light Despite their potentially large production cross sections, it turns out, that new third-generation-philic spin-0 particles may have escaped detection in existing experiments even for moderately large couplings, if they have masses in the ballpark of [10,50] GeV. Formulas for the partial widths and branching ratios of spin-0 states are collected in the Appendix
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