B - SLAC

SuperKEKB
♦ Asymmetric-energy e + e − collider to be realized by upgrading the
existing KEKB collider.
♦ Super-high luminosity ≅ 8×10 35 cm −2 s −1 → 10 10 BB per yr.
→ 8×10 9 τ + τ − per yr.
♦ Letter of Intent is available at: http://belle.kek.jp/superb/loi
E CM =M(ϒ(4s))
Higher beam current,
smaller β y * and
crab crossing
→ L = 8×10 35
Belle with improved rate immunity
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