1. Mini-workshop at Fukui H. Hayashii (NWU)  Physics at Belle(II) 2014/5/23 1

2. Indirect search: In the past 2014/5/23 2

3. EW precision measurement and Higgs 2010 status Higgs is discovered by LHC (ATLAS/CMS) at 125 GeV 2012 What next? : No guide line such as Standard Model. Search as wide and precise as possible. Third Generations: B and tau One of best places Tau Lepton: appear in many places 2014/5/23 3

4. Tau Physics τ μ 2014/5/23 4

5. Today ’s talk 2014/5/23 5

6. By Ohshima 1997 doneee e ee e in progress 2014/5/23 6

7. Lepton Universality SM assumes g  = g  = g e 2014/5/23 7

8. Key observables Tau mass, Tau lifetime, leptonic branching fraction m ,  , B e, B  BESIII (2014) arxiv.1405.1076 2014/5/23 8

9. dl=0 for ideal case. Asymmetry-energy layout of experiment allows us to determine     production point in Lab event-by-event basis independently from the position of beam IP. 2014/5/23 9

10. c.f. LEP EWG: Phys.Rep. 532,119 (2013) 2014/5/23 10

11. Lepton-flavor-violating  decays SM: Clean probe for New Physics 2014/5/23 11

12. Exciting Prospects New Physics 2014/5/23 12

13. Hadronic Tau Decay Only lepton massive enough to decay into hadrons Clean probe for low-energy hadronic system. Offer unique tools for precision study of low energy QCD. Theoretically: Inclusive Br is cleaner than exclusive. Experimentally: Need to add exclusive measurements to obtain inclusive one. 2014/5/23 13

14. Spectral function(Theory) 2014/5/23 14

15. Spectral Functions and as Yet, only LEP data are available. (A. Pich) 2014/5/23 15

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19. 2014/5/23 19

20. Cabbibo-suppressed decay and Vus 4% difference btw  and K data 2014/5/23 20

21. Belle: 2014 new measurement Need to be checked by Belle II with improved Kaon ID. 2014/5/23 21

22. Strange spectral function Very small number of events! 2014/5/23 22

23. Tau2010 M. Davier summary talk (Strange spectral functions can provide the most accurate value of Vus. A. Pich ) 2014/5/23 23

24. Available unfolded mass spectra (3h) Babar Belle ( MJ ) SR 2014/5/23 24

25. Low-energy QCD ? Is this interesting? Experimentary: Exotic hadrons from experimental side. There are a lot of theoretical interests. Lattice, Chiral-Perturbation,,, (Famous as a difficult problem) AdS/CFT (Gravity/QCD) correspondence from String Theory QCD: strong coupling limit (+large Nc ) in 4 dimension Gravity (AdS) in 5 dimension (week coupling) One can obtain the low-energy hadron properties from (5D) gravity !!??! You need not believe it but it is interesting! Black hole vs Quark Gluon plasma 2014/5/23 25

26. z: 5 th coordinate Five Dimensional anti-de Sitter space z is the fifth coordinate z variable acts as a scaling variable in Minkowski-space. z correspond to the different energy scales at which the hadron is examined. Brodsky, Teramond 2014/5/23 26

27. 2014/5/23 27 GroupInt. Luminosity fb -1 N , LEP(Z-peak)0.340.33x10 6 CLEO(10.6 GeV)13.813x10 6 Babar(10.6 GeV)5164.8x10 8 Belle(10.6GeV)10149.3x10 8 BelleII/SuperKEKB 50,0004.5x 10 10 Tau Lepton Factories: past/now/future World largest statistics of  lepton is collected by B-factories. Belle II are planning to collect additional x50 times more data. Belle II with 50 ab -1 yield 4.5x 10 10 pairs. 「LEP data are yet dominated for inclusive hadron spectram」 σ (e + e -   +  - )= 0.919nb at  (4S)

28. Form Factor 2014/5/23 28

29. Coupling Constant 2014/5/23 29 Tau result Normalization ? g1 scheme c.f. p 20 MS-bar scheme arxiv:1002.3948

30. 2014/5/23 30

31. 2014/5/23 31

32. Tau Physics at Belle II Lepton Flavor Violation. Search for CP violation in charged lepton. Precise measurements Michel parameters …. Inclusive hadron properties. B(  - → K - ), B(  - → K -   ) with new Kaon ID. Non-strange: vector/axial vector Strange spectral functions. Need persons. 2014/5/23 32

33. Backup 2014/5/23 33

34. (g-2)  : recent progress e + e - vs tau 2014/5/23 34 A long standing puzzle 2pi spectrum between e + e - and tau decay Jegerlehner (2011) :Need a  and  interference terms in e+e- →  +  - Eur.Phys.J. C71,1632(2011) without  int. with  int.

35. 2014/5/23 35 Pich 2012

36. Meson mass spectra 2014/5/23 36

37. 2014/5/23 37 Hadron Form Factors