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Search for Lepton Flavor Violating Tau decays at B-factory 2006/2/27-3/2 K.Inami Nagoya university, Belle - Introduction - Experimental results - Future.

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Presentation on theme: "Search for Lepton Flavor Violating Tau decays at B-factory 2006/2/27-3/2 K.Inami Nagoya university, Belle - Introduction - Experimental results - Future."— Presentation transcript:

1 Search for Lepton Flavor Violating Tau decays at B-factory 2006/2/27-3/2 K.Inami Nagoya university, Belle - Introduction - Experimental results - Future prospects - Summary International workshop e+e- collisions from phi to psi

2 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP2 Lepton flavor violating decays have a very small probability in the Standard Model (even with neutrino oscillation). New physics effects (SUSY, Extra-D, etc.) may allow us to observe LFV with the present experimental sensitivity. Previous results from CLEO were sensitive to Br~O(10 -6 ). The B factories (Belle and BaBar) have sensitivities of O(10 -7 ~10 -8 ). Introduction

3 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP3 B-factories Asymmetric-energy e + e - collider at Upsilon(4S) For CPV search with B 0 Very high luminosity Integrated luminosity >500fb -1 for Belle >300fb -1 for BaBar Tau factory!  (  )~0.9nb,  (BB)~1.1nb 300fb -1 500fb -1

4 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP4 Detectors at B-factories F/B asymmetric detectors Good vertex resolution and particle ID ability Accumulated data: >4.5x10 8  -pairs at Belle, >3.0x10 8  -pairs at BaBar  Br~O(10 -8 ) sensitivity!

5 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP5 Analysis method Event Selection Low multiplicity events Separate into hemispheres Signal and tag sides Missing momentum Low missing mass Small N  Lepton tag etc.

6 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP6 Analysis method (2) Signal extraction Calc. M inv and  E  E=E rec -E beam Blinded signal region  Event selection study Estimate background using sideband data Open blind and estimate signal yield Estimate upper limits BG reduction is important to improve the sensitivity. Signal MC of    Signal region Background

7 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP7    Belle 86.3fb -1 data Br<3.1x10 -7 at 90%C.L. PRL 92, 171892 (2005). BaBar 232fb -1 data Br<0.68x10 -7 PRL 95, 041802 (2005). Background:    + ISR Small contamination of  BG in  E>0

8 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP8    : Belle vs BaBar Belle : Br<3.1x10 -7 / 86.3 fb -1  = 11.1% 2D EML fit with  5  signal box N signal = 0, N BG = 54 N signal is constrained to be  0. BaBar : Br<0.68x10 -7 / 232 fb -1  = 9.4% 1D EML fit with  2   E band N signal =  2.2, N BG = 143 N is allowed to be negative. Negative yield gives lower U.L. than expected. Belle :  5  box BaBar :  2  band

9 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP9 BaBar 232fb -1 data Br<1.1x10 -7 PRL 96, 041801 (2006). ee Belle 86.7fb -1 data Br<3.9x10 -7 at 90%C.L. PLB 613, 20 (2005). Background:   e + ISR

10 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP10 ll Belle: 87.1fb -1, BaBar: 91.5fb -1 PLB 598, 103 (2004), PRL 92, 121801 (2004). Br<(1.1~3.5)x10 -7 at 90%C.L. Background: low level qq around  E 0 Belle’s results Signal region

11 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP11   lhh Belle: 158fb -1, BaBar: 221fb -1 Br<(1.6~8.0)x10 -7 by Belle (preliminary) Br<(0.7~4.8)x10 -7 by BaBar, PRL 95, 191801 (2005). Background: qq(flat) and  (corner)   ehh: negligible BG level BaBar’s results

12 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP12 l0//’l0//’ Lepton + Pseudoscalar meson Belle: 154fb -1 Br(    )<1.5x10 -7 Br < (1.5~10)x10 -7 PLB 622, 218 (2005). Background  :  + qq e: negligible Data  qq           ’ ee ee e’e’ Signal region

13 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP13   lKs Belle: 281fb -1 Br(    Ks)<0.52x10 -7 Br(   eKs)<0.60x10 -7 (Preliminary, hep-ex/0509014) Most stringent U.L. among tau LFV searches High efficiency (14%,12%) and Low BG Background: negligible D ±  l ± Ks,  ± Ks    Ks   eKs Belle preliminary

14 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP14   lV 0 Lepton+Vector meson Belle: 158fb -1 Br<(2.0~7.7)x10 -7 (Preliminary) Background:     V 0 : + qq   eV 0 : +2photon (ee  eeuu, eess etc.) Belle preliminary               ee ee eeee Signal region

15 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP15   Baryons   p , p  0 Belle (preliminary) B(   p  )<3.0x10 -7 (87fb -1 ) B(   p  0 )<6.5x10 -7 (154fb -1 ) Background: many , qq p/  misidentification    Belle: 154fb -1 B(    )<1.4x10 -7 B(    )<0.72x10 -7 PLB 632, 51 (2006). Background:  (a 1 ), qq     

16 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP16 B.R. summary Br < O(10 -6 ) in PDG (by CLEO)  Br < O(10 -7 ) by Belle and BaBar New Physics

17 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP17 For Future B-factories are accumulating data stably. Currently, >7.5x10 8  -pairs in two B-factories. However, improvement of LFV sensitivity will be slow. Non-negligible backgrounds Need better  /  separation Low energy  -factory may have an advantage. Effects of ISR and qq may be reduced. //

18 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP18 Future prospect Super B-factory : >10 times more data B.R. sensitivity: ~1/n for negligible BG case ~1/  n for BG dominated modes

19 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP19 Future prospect (2) Possible sensitivity with Super B-factory Red band for 5~10ab -1 Super B-factory

20 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP20 Summary A data sample of >7.5x10 8  -pairs has been successfully obtained by the B-factories. LFV sensitivities are Br~1x10 -7. Exploring possible parameter space of New Physics For some modes, it will be hard to improve the sensitivity due to backgrounds. Better muon identification Tau-factory at around energy threshold may be better to reduce ISR effects. ? Super B-factory will produce 10 10  -pairs at 10ab -1.  LFV sensitivity will reach Br~O(10 -9 ).

21 2006/2/27-3/2 International workshop e+e- collisions from phi to psi at BINP21 Effect to physics parameter MSSM with Seesaw PRD 60, 055008 (1999). Higgs mediated in MSSM PRD 66, 057301 (2002). Heavy Dirac neutrino model PRD 62, 0306010 (2000). B(   lV 0 ) constrain y 2  e and y 2 .

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