Abstract
Many dark matter models generically predict invisible and displaced signatures at Belle II, but even striking events may be missed by the currently implemented search programme because of inefficient trigger algorithms. Of particular interest are final states with a single photon accompanied by missing energy and a displaced pair of electrons, muons, or hadrons. We argue that a displaced vertex trigger will be essential to achieve optimal sensitivity at Belle II. To illustrate this point, we study a simple but well-motivated model of thermal inelastic dark matter in which this signature naturally occurs and show that otherwise inaccessible regions of parameter space can be tested with such a search. We also evaluate the sensitivity of single-photon searches at BaBar and Belle II to this model and provide detailed calculations of the relic density target.
Highlights
Its hermetic detector and optimized triggers allow for searches for various DM models
The focus of the present work has been on the phenomenology of dark sectors that contain unstable but long-lived particles
An appealing example for such a dark sector are models of inelastic DM, in which a mass splitting ∆ between two dark sector states χ1 and χ2 ensures that constraints from the Cosmic Microwave Background (CMB) and direct detection experiments are evaded
Summary
A appealing scenario for the production of DM is thermal freeze out, which is insensitive to the initial conditions of the early universe and very predictive. This mechanism requires significant couplings to SM states to allow both for an initial thermalisation of the dark sector as well as sufficiently effective annihilations to be consistent with the observed relic abundance Ωh2 = 0.12 [23]. The only way to conclusively test this scenario is via accelerator experiments Given that this set-up is a well-motivated scenario for light thermal DM, it has previously been discussed in the literature in the context of particle colliders [25, 26], fixed-target experiments [12] and the muon anomalous magnetic moment [27]
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