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

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events/(50MeV/c 2 ) N events / 2.5 MeV/c 2 30 20 10 14 12 10 0 8 6 4 2 data total Kργ qq b→sγ + BB 0.8 1 1.2 1.4 1.6 M Kπ (GeV/c 2 ) a) events/(100MeV/c 2 ) 40 30 20 10 0 data total K*πγ qq b→sγ +BB 0.5 0.75 1 1.25 1.5 M ππ (GeV/c 2 ) Figure 1.6: B + → K ∗0 π + γ and B → K + ρ 0 γ from Belle. 0 5.2 5.22 5.24 5.26 5.28 M bc , GeV/c 2 N events / 8 MeV/c 2 25 20 15 10 Figure 1.7: B + → Kφγ from Belle. 17 5 0 b) 1 1.05 1.1 1.15 1.2 1.25 M (K + K - ) , GeV/c 2
Events/(1MeV/c 2 ) 60 40 20 data total BB + qq background BB background 0 5.24 5.25 5.26 5.27 5.28 5.29 Mbc (GeV/c 2 ) Events/(1MeV/c 2 ) 60 40 20 data total BB + qq background BB background 0 5.24 5.25 5.26 5.27 5.28 5.29 Mbc (GeV/c 2 ) Figure 1.8: B-tagged (top-left), B-tagged (top-right) B → Xsγ signals from Belle. Search for Direct CP -Asymmetry The direct CP -asymmetry in B → Xsγ is predicted to be 0.6% in the Standard Model with a small error [40, 41]. A large CP -asymmetry would be a clear sign of new physics. An ACP (B → Xsγ) measurement was performed by Belle [42], by summing up the exclusive modes of one kaon plus up to four pions and modes with three kaon plus up to one pion. This result eliminates B → Xdγ by exploiting particle identification devices for the tagged ∼ hadronic recoil system. M(Xs) < 2.1 GeV is required, which roughly corresponds to Emin γ 2.25 GeV. Events are self-tagged as B candidates (B0 or B + ) or B candidates (B0 or B− ), except for ambiguous modes with a K0 S and zero net charge. In order to correct the imperfect knowledge of the hadronic final state, the signal yields for each exclusive mode are used to correct the Monte Carlo multiplicity distribution. The resulting B-tagged (342 ± 23 +7 −14 events), B-tagged (349 ± 23 +7 −14 events) signals are shown in Figure 1.8. Using the wrong-tag fractions of 0.019 ± 0.014 between B- and B-tagged, 0.240 ± 0.192 from ambiguous to B- or B-tagged, and 0.0075 ± 0.0079 from B- or B-tagged to ambiguous samples, the asymmetry is measured to be ACP (B → Xsγ) = 0.004 ± 0.051 ± 0.038. (1.11) The result corresponds to a 90% confidence level limit of −0.107 < ACP (B → Xsγ) < 0.099, and therefore already constrains part of the new physics parameter space. For exclusive radiative decays, it is straightforward to extend the analysis to search for the direct CP -asymmetry [32–34]. Particle identification devices at Belle and BaBar resolve the possible ambiguity between K ∗0 → K + π − and K ∗0 → K − π + to an almost negligible level with a reliable estimation of the wrong-tag fraction (0.9% for Belle). The results of the asymmetry measurements are listed in Table 1.3, whose average is ACP (B → K ∗ γ) = (−0.5 ± 3.7) × 10 −2 . (1.12) It is usually thought that large CP -violation in B → K ∗ γ is not allowed in the Standard Model and the above result may be used to constrain new physics. However, as the involved strong phase difference may not be reliably calculated for exclusive decays, the interpretation may be model dependent. Search for b → dγ Final States There are various interesting aspects of the b → dγ transition. Within the Standard Model, most of the diagrams are the same as those for b → sγ, except for the replacement of the CKM 18
Page 1 and 2: Letter of Intent for KEK Super B Fa
Page 3 and 4: 4 Sensitivity at SuperKEKB 66 4.1 O
Page 5 and 6: Executive Summary The grand challen
Page 7 and 8: Observable SuperKEKB LHCb (5 ab −
Page 9 and 10: Chapter 1 Introduction 1.1 Motivati
Page 11 and 12: e + e − B factory may be measured
Page 13 and 14: Entries/ps (N qξ=−1 −N qξ=+1
Page 15 and 16: Entries / 0.0025 GeV/c 2 30 20 10 0
Page 17: ) 2 Entries (/ MeV/c 80 70 60 50 40
Page 21 and 22: events / 2.5 MeV/c 2 10 5 0 10 5 0
Page 23 and 24: Table 1.6: B → Xsℓ + ℓ − br
Page 25 and 26: [2] M. Kobayashi and T. Maskawa,
Page 27 and 28: [37] A. L. Kagan and M. Neubert,
Page 29 and 30: Chapter 2 Flavor Structure of the S
Page 31 and 32: (a) (b) VudV ∗ ub φ3 VudV ∗ ub
Page 33 and 34: ¢ Figure 2.4: Tree-type W boson ex
Page 35 and 36: together with the normalization con
Page 37 and 38: weak phase of the penguin contribut
Page 39 and 40: 2.5.2 Heavy Quark Expansion The inc
Page 41 and 42: FNAL ’98 JLQCD ’98 MILC ’98 C
Page 43 and 44: [8] T. Inami and C. S. Lim, “Effe
Page 45 and 46: [41] A. S. Kronfeld and J. N. Simon
Page 47 and 48: [76] S. Aoki et al. [JLQCD Collabor
Page 49 and 50: quantitatively insufficient (for a
Page 51 and 52: • Decoupling. The squarks and sle
Page 53 and 54: PSfrag replacements θSUSY S φK 0
Page 55 and 56: g replacements θ SUSY S φK 0 S ,
Page 57 and 58: most sensitive to the flavor struct
Page 59 and 60: When sleptons are much heavier than
Page 61 and 62: constant. Furthermore, when the rig
Page 63 and 64: [23] Y. Nir and N. Seiberg, “Shou
Page 65 and 66: [56] S. Fukuda et al. [Super-Kamiok
Page 67 and 68: Chapter 4 Sensitivity at SuperKEKB
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l r interval ɛl wl ∆wl ɛ l eff
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decay mode yield eff. (%) purity(%)
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4.2 New CP -violating phase in b
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yields 1.03 ± 0.15(stat) ± 0.05(s
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Mode 5 ab −1 50 ab −1 ∆S ∆A
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A 0.75 0.5 0.25 0 -0.25 -0.5 -0.75
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Events/(10 MeV) 7 6 5 4 3 2 1 (d) B
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significance at 5 ab -1 15 10 5 0
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The above studies aim at providing
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effects which are encoded in the st
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Entries per 33 MeV 10 6 10 5 10 4 1
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) 2 Entries (/ MeV/c 6 5 4 3 2 1 0
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Events/(1MeV/c 2 ) 700 600 500 400
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H 2.5 2 1.5 1 0.5 0 ˜ɛ0 m H ± 10
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Events/(100MeV/c 2 ) 10 4 10 3 10 2
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mode. 98
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¦§¥ ¦§¥£ ¦§¢ ¦§£ Figu
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Table 4.9: Summary of the reconstru
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Figure 4.21: The |MM| 2 distributio
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¡ ¥ £ ¤¥¡ ¡¥ ¢ ¡ ¡
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Entries/ps (N qξ=−1 −N qξ=+1
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4.7 φ2 central value error at erro
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C.L. 1 0.8 0.6 0.4 0.2 0 0 20 40 60
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Using the notation of [69] the deca
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φ 2 error(degree) 10 1 10 -1 10 -1
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B 0 B 0 _ _ b d b _ d _ c d u _ d _
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Entries/ps 14 12 10 8 6 4 2 (a) 0 -
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process (T: color-favored tree, C:
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Figure 4.33: Search for B − → D
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M 2 Ksπ- , GeV 2 3 2.5 2 1.5 1 0.5
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δ, deg 350 300 250 200 150 100 50
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q 2 (GeV 2 ) 30 25 20 15 10 5 reson
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Cuts on (q2 , m2 X ) G(q2 cut, mcut
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f 0,+ (q 2 ) 2.0 1.0 UKQCD APE Ferm
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120 100 80 60 40 20 ID Entries Mean
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Relative Error (%) 20 18 16 14 12 1
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Relative Error (%) 20 18 16 14 12 1
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LFV processes discussed here are ex
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For τ − → µ − (e − )η,
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cluding trigger performance. Howeve
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tanβ 100 80 60 40 20 0 current upp
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4.11 Diversity of physics at Super-
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complicated nature for sin 2 ΘW [1
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where s is the square of the center
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• The properties of these states
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N/20 MeV/c 2 30 20 10 a) 0 2.2 2.6
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Observable Belle 2003 SuperKEKB LHC
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[21] M. Ciuchini et al., Phys. Rev.
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[62] K. Abe et al. [Belle Collabora
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[95] A. K. Leibovich, I. Low and I.
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[132] M. Gronau, Y. Grossman and J.
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Chapter 5 Study of New Physics Scen
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(a) (c) S(K *0 γ) S(K *0 γ) 0.2 0
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0.2 0.6 1 1 S(K *0 γ) S(φKs) 0 -1
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0.2 0.6 1 1 S(K *0 γ) S(φKs) 0 -1
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parameters central values errors 0.
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(a) (b) (c) Figure 5.8: (a) Constra
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Figure 5.9 also show the SUSY model
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Letter of Intent for KEK Super B Factory Part I: Physics

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