Belle II Technical Design Report

Abstract

The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. A new international collaboration Belle-II, is being formed. The Technical Design Report presents physics motivation, basic methods of the accelerator upgrade, as well as key improvements of the detector.

Figures (732)

• Figure 1: Illustrative region of sensitivity to NP as a function of the flavor violating couplings (relative to the SM) in the indirect searches at KEKB and SuperKEKB, and direct searches at LHC and Tevatron.
• Figure 2: The SM contribution (left) and the gluino-down squark contribution (right) to the$b \rightarrow s \bar{s} s$ transition.
• Figure 3: Expected precision of$\Delta S$ measurements as a function of integrated luminosity [23].
• Figure 4: Expected precision of the TCPV asymmetry measurements for$B \rightarrow K^{* 0}(982) \gamma$ (green), other $K_{S} \pi^{0} \gamma$ (blue) and all $K_{S} \pi^{0} \gamma$ final state (red) as a function of integrated luminosity [23].
• Figure 5: Constraints on the MIA parameter$\operatorname{Re}\left(\delta_{R L}^{d}\right)$ and $\tan \beta$ from the measurement of the $S\left(K_{S} \pi^{0} \gamma\right)$ and $\mathcal{B}\left(B_{s} \rightarrow \mu^{+} \mu^{-}\right)$[23]. Contours of $S\left(K_{S} \pi^{0} \gamma\right)$ are shown in the intervals of 0.1 .