Kavli Affiliate: Takeo Higuchi
| First 5 Authors: Latika Aggarwal, Swagato Banerjee, Sunil Bansal, Florian Bernlochner, Michel Bertemes
| Summary:
Belle II is an experiment operating at the intensity frontier. Over the next
decades, it will record the decay of billions of bottom mesons, charm hadrons,
and tau leptons produced in 10 GeV electron-positron collisions at the
SuperKEKB high-luminosity collider at KEK. These data, collected in
low-background and kinematically known conditions, will allow us to measure
hundreds of parameters that test the standard model (SM) and probe for the
existence of new particles, at mass scales orders of magnitudes higher than
those studied at the energy frontier. We project our sensitivities for
measurements that are of primary relevance and where Belle II will be unique or
world leading for data corresponding to 1 to 50 ab-1. Belle II will uniquely
probe non-SM contributions in sensitive b -> qqbar s decays and charmless b ->
qqbar d(u) decays, semileptonic b -> s nu nubar and s tau+ tau- decays, fully
leptonic b -> ell nu decays, and select c -> u processes. Belle II will lead
exploration of non-SM physics in b -> c tau nu and b -> s gamma decays and will
most precisely determine the quark-mixing parameters |Vub| and |Vcb|. Belle II
will measure many parameters in tau physics to precisions that will be world
leading for the foreseeable future, including the electric and magnetic dipole
moments, branching fractions for charged-lepton-flavor-violating decays, and
quantities that test lepton-flavor universality. Belle II will perform unique
searches for dark-sector particles with masses in the MeV–GeV range. We will
also pursue a broad spectroscopy program for conventional and multiquark c cbar
and b bbar states and provide essential inputs to sharpen the interpretation of
muon magnetic-anomaly results. Our exploration of uncharted regions of non-SM
parameter space with high precision will reveal non-SM particles or set
stringent constraints on their existence, guiding future endeavors.
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