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UMN High Energy Theory Seminars
Probing Dark Forces with Polarized Beams at Chiral Belle
by
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America/Chicago
Description
When equipped with a polarized electron beam, the Belle II detector—dubbed "Chiral Belle"—opens new opportunities to search for invisibly decaying (dark) bosons that weakly couple to the Standard Model. I will discuss how the dark boson's spin and Lorentz structure of its coupling can be inferred by measuring the polarization dependence of mono-photon production due to both SM and BSM processes. This is explored in the context of three different scenarios: a dark photon, a mass-mixed "dark Z", and a vector coupling exclusively to right-handed fermions. I will present the projected sensitivities which illustrate how Chiral Belle could precisely constrain the couplings of each vector type to the Standard Model in the event of a positive signal.