Hadronic Tau Decays at BaBar

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1 Hadronic Tau Decays at BaBar Swagato Banerjee Joint Meeting of Pacific Region Particle Physics Communities (DPF006+JPS006 Honolulu, Hawaii 9 October - 3 November 006 (Page: 1

2 Hadronic τ decays Only lepton that decays into hadrons Hadronic Branching Fraction 65% Initial state represents perfect QCD vacuum τ h ν τ probes hadronic V A current: h d θ γ µ (1 γ 5 u 0, where d θ = cos θ C d + sin θ C s Cabibbo allowed and suppressed decays Ideal for measurements of fundamental quantities like V us, m s, α s Several resonance (sub-structure waiting to be observed Hadronic τ (Page:

3 Strange Spectral Function Inclusive study of strange spectral functions from final states with net strangeness of unity world s best measurement of V us, m s Branching Fractions ( 10 3 [PDG 005] Preliminary B(τ K π 0 ν τ and B(τ K π π + ν τ reported with better precision than the world average (TAU06, Pisa Hadronic τ (Page: 3

4 τ -factory PEP-II B-factory: also a τ-factory At Υ (4S: s = GeV σ(e + e BB = 1.05 nb σ(e + e τ + τ = 0.89 nb Experiment # of τ-pairs LEP CLEO Hadronic τ (Page: 4

5 The Detector Excellent K/π separation dedx Cherenkov angle Hadronic τ (Page: 5

6 Recent Results from Runs 1-4 Data (L 30 fb 1 τ π π } π {{ + π } 0 ω τ π π π + η }{{} f 1 (185 τ K }{{ π } 0 ν τ K (89 ν τ ν τ Most analyses use leptonic tag Runs 1-5 Data (L 340 fb 1 τ π π π + ν τ τ K π π + ν τ τ π K } {{ K + } φ τ K K } {{ K + } φ ν τ ν τ Hadronic τ (Page: 6

7 τ π π π + π 0 ν τ 411K e-tagged events Background: 10% (τ + τ events with extra π 0 (Preliminary: B(τ π π π + π 0 ν τ = (4.39 ± 0.01 ± PDG (Aleph, CLEO: (4.46 ± Entries π π π + π m(4π (GeV/c Fit Breit-Wigner convoluted with 5000 Gaussian (resolution: 6.1 MeV π π + π 0 plus polynomial background 0000 ( 6% from τ + τ with extra π Preliminary: B(τ π ων τ = 5000 (1.97 ± 0.01 ± Aleph: (1.91 ± 0.07 ± m(3π (GeV/c Events / ( GeV/c Hadronic τ (Page: 7

8 τ π π π + ην τ Fit with Novosibirsk function: (160 ± 56 η candidates qq Background: (54 ± 16 (Preliminary: B(τ π π π + ην τ = (1.84 ± 0.09 ± PDG : (.3 ± Mass (GeV/c Events/0.003 GeV/c γ γ Fit Breit-Wigner convoluted with Gaussian (resolution: 7 MeV (951 ± 78 f 1 (185 candidates (Preliminary: B(τ π f 1 ν τ = (3.83 ± 0.3 ± 0.0 ± : (4.6 ± 1. ± using f 1 (185 π π π + π + decays Events/0.005 GeV/c π π + η Mass (GeV/c Hadronic τ (Page: 8

9 Resonant Contributions Ratio of Branching Fractions ( Preliminary: R ( τ π ω π π π + π 0 ν τ τ π π π + π 0 ν τ = ± 0.00 ± R ( τ π f 1 π π π + ην τ τ π π π + ην τ = 0.73 ± 0.01 ± 0.04 τ π π π + ην }{{} τ decays η Suppressed by G-parity ( nd Class Current Expected at the level of isospin breaking m u m d We fit the region around η (958 and find no signal (Preliminary: B(τ π η ν τ < % C.L. CLEO: Upper Limit = % C.L. Hadronic τ (Page: 9

10 τ K π 0 ν τ 78K e/µ-tagged events: τ + τ mostly; qq, µ + µ small Background sources: K/π mis-id, π 0 reconstruction in-efficiency ALEPH (5.±0.04± CLEO (5.1±0.10± ALEPH ( (4.44±0.06± OPAL ( (4.71±0.059± BaBar Preliminary (4.39±0.003± PDG Fit (4.5± BR (% Hadronic τ (Page: 10

11 τ π π π + ν τ 1.6M e/µ-tagged events: τ + τ mostly (extra π 0 ; qq < 0.1% Particle-ID component of efficiency migration matrix: π π π + K π π + K π K + K K K %.8% 4.8% 1.0% Events/(0MeV/c CLEO III (9.13±0.05± M (GeV/c BaBar Preliminary - (9.11±0.01± PDG Fit (9.0± BR (% Hadronic τ (Page: 11

12 τ K π π + ν τ 69K e/µ-tagged events: non-cross-feed background small Particle-ID component of efficiency migration matrix: π π π + K π π + K π K + K K K + 1.4% 74.7% 16.3% 6.5% 8 Events/(0MeV/c OPAL ( (3.60±0.08± ALEPH (.14±0.037± CLEO (3.46±0.03± CLEO (3.84±0.14± OPAL ( (4.15±0.53± BaBar Preliminary (.88±0.0± PDG Fit (3.33± M (GeV/c BR (% Hadronic τ (Page: 1

13 τ K π K + ν τ 18K e/µ-tagged events: non-cross-feed background negligible Particle-ID component of efficiency migration matrix: π π π + K π π + K π K + K K K + 0.5% 60.1% 5.8% Events/(0MeV/c M (GeV/c ALEPH (1.63±0.1± CLEO (1.45±0.13± OPAL ( (0.87±0.56± CLEO III (1.55±0.06± BaBar Preliminary (1.373±0.011± PDG Fit (1.53± BR (% Hadronic τ (Page: 13

14 τ K K K + ν τ (75 ± 17 e/µ-tagged events: non-cross-feed background < 1% Particle-ID component of efficiency migration matrix: π π π + K π π + K π K + K K K + 0.3% 50.7% Events/(5MeV/c CLEO III -5 <3.7 90%CL M (GeV/c 1 BaBar Preliminary -5 (1.59±0.14± BR (% Hadronic τ (Page: 14

15 New decay modes via φ resonance Events/(5MeV/c φ Entries/(5MeV/c φ (GeV/c M K + - K (GeV/c M K + - K FIRST MEASUREMENTS of π φ and inclusive K K K + states: B(τ π φν τ = (3.49 ± 0.55 ± (Significance: 5.5σ B(τ K φν τ = (3.48 ± 0.0 ± (Significance: 10.6σ τ K φν τ consistent with saturating τ K K K + ν τ channel Consistent with Belle: B(τ K φν τ = (4.06 ± 0.5 ± Hadronic τ (Page: 15

16 Conclusions B-Factories are also τ-factories On-going efforts to better understand systematic errors π 0, η reconstruction efficiency uncertainty in production cross-section σ e+ e τ + τ % dataset expected to be doubled by 008 Expect lots of more τ-physics in near future: High precision tests of QCD Measurements of fundamental quantities: V us, m s, α s Resonance sub-structure of hadronic final states Search for second class currents Search for violation of charge-parity symmetry in τ decays Hadronic τ (Page: 16

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