The SuperKEKB design reuses many components from KEKB. Under normal operation, SuperKEKB collides electrons at 7 GeV with positrons at 4 GeV (compared to KEKB at 8 GeV and 3.5 GeV respectively). The centre-of-momentum energy of the collisions is therefore at the mass of the Υ(4S) resonance (10.58 GeV/c2). The accelerator will also perform short runs at energies of other Υ resonances, in order to obtain samples of other B mesons and baryons. The asymmetry in the beam energy provides a relativistic Lorentz boost to the B meson particles produced in the collision. The direction of the higher-energy beam determines the 'forward' direction, and that affects the design of much of the Belle II detector.
On June 15, 2020, SuperKEKB set a new world record for the highest instantaneous luminosity for a colliding-beam accelerator: 2.22×1034 cm−2s−1. (On June 21, 2020, SuperKEKB broke its own record and achieved an instantaneous luminosity of 2.40×1034 cm−2s−1.) The previous world record of 2.14×1034 cm−2s−1 was achieved by LHC in 2018.
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Ohnishi, Yukiyoshi; Abe, Tetsuo; Adachi, Toshikazu; Akai, Kazunori; Arimoto, Yasushi; Ebihara, Kiyokazu; Egawa, Kazumi; Flanagan, John; Fukuma, Hitoshi (1 January 2013). "Accelerator design at SuperKEKB". Progress of Theoretical and Experimental Physics. 2013 (3): 3A011. Bibcode:2013PTEP.2013cA011O. doi:10.1093/ptep/pts083. https://doi.org/10.1093%2Fptep%2Fpts083
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