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SuperKEKB Collider
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SuperKEKB Collider
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SuperKEKB, a 7 GeV electron - 4 GeV positron double-ring collider, is constructed by upgrading KEKB in order to seek new physics beyond the Standard Model. The design luminosity of SuperKEKB is 8 x 10^35 /cm^2 /s - 40 times higher than that achieved by KEKB. The greater part of the gain comes from significantly decreasing the beam sizes at the interaction point based on the nanobeam collision scheme; the design beam currents in both rings are double those achieved in KEKB. Large-scale construction to upgrade both the collider rings and the injector was conducted, and beam commissioning without the Belle II detector and final-focus magnets was successfully carried out from February to June in 2016. Subsequently, renovation of the interaction region, including the installation of the final-focus magnets and Belle II, and construction in the final stage of a new positron damping ring were conducted. Having completed the interaction region, beam collision tuning is scheduled from March till July in 2018. This paper reviews the design, construction, and beam commissioning of SuperKEKB.
Forward citations
Cited by 4 Pith papers
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First evidence of $X(3872)\to\pi^0\chi_{c0}(1P)$ and search for $X(3915)\to\pi^0\chi_{c1}(1P)$
First evidence reported for X(3872)→π⁰χ_c0 decay at 3.4σ, with branching fraction ratio 2.3 relative to π⁺π⁻J/ψ, upper limits on other modes, and no signal for X(3915)→π⁰χ_c1.
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Search for the lepton-flavor-violating $\tau^{-} \rightarrow e^{\mp} \ell^{\pm} \ell^{\mp}$ decays at Belle II
Belle II sets upper limits between 1.3 and 2.5 times 10 to the minus 8 on branching fractions for four tau to e l l decay modes at 90 percent confidence level, the most stringent to date for four modes.
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Search for axion-like particles decaying to two photons at Belle II
No ALP signal is seen in three-photon events at Belle II; 95% CL upper limits on g_aγγ reach ~10⁻⁴ GeV⁻¹ and are the most restrictive over nearly 0.17–5 GeV/c².
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Charged-lepton identification at Belle~II
Belle II describes its charged-lepton identification algorithms and reports performance on 428 fb^{-1} of Run 1 data from SuperKEKB.
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