Letter of Intent for KEK Super B Factory Part I: Physics

Events/(0.002GeV/c 2 )
1000
900
800
700
600
500
400
300
200
100
Sum
J/ψK S (π + π - )
J/ψK S (π 0 π 0 )
ψ(2S) K S
χ c1 K S
η c K S
J/ψ K * (K S π 0 )
0
5.2 5.22 5.24 5.26 5.28 5.3
Beam Constrained Mass (GeV/c 2 )
Figure 1.1: (Left) The fully reconstructed CP -eigenstate sample. (Right) The p∗ B (B momentum
in the CM frame) distribution for the B → J/ψK0 L sample (right). The shaded portions show
the contributions of different background components. The vertical dashed lines indicate the
signal region.
Table 1.1: The yields for reconstructed B → fCP candidates after flavor tagging and vertex
reconstruction, Nev, and the estimated signal purity, p, in the signal region for each fCP mode.
mesons are
J/ψ mesons are reconstructed in J/ψ → µ + µ − or e + e− decays. Candidate K0 S
reconstructed in K0 S → π+ π− decays unless explicitly stated otherwise.
Mode ξf Nev p
J/ψK0 S
J/ψK
−1 1997 0.976 ± 0.001
0 S (π0π0 )
ψ(2S)(ℓ
−1 288 0.82 ± 0.02
+ ℓ− )K0 S
ψ(2S)(J/ψπ
−1 145 0.93 ± 0.01
+ π− )K0 S
χc1(J/ψγ)K
−1 163 0.88 ± 0.01
0 S
ηc(K
−1 101 0.92 ± 0.01
0 SK−π + )K0 S
ηc(K
−1 123 0.72 ± 0.03
+ K−π 0 )K0 S
ηc(pp)K
−1 74 0.70 ± 0.04
0 S
All with ξf = −1
−1
−1
20
2911
0.91 ± 0.02
0.933 ± 0.002
J/ψK∗0 (K0 Sπ0 )
J/ψK
+1(81%) 174 0.93 ± 0.01
0 L +1 2332 0.60 ± 0.03
11