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A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 1 “Final” Γ(Ke3) / Γ(pipi0) Γ(Kmu3) / Γ(pipi0) Γ(Kmu3) / Γ(ke3) Anne Dabrowski Northwestern.

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Presentation on theme: "A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 1 “Final” Γ(Ke3) / Γ(pipi0) Γ(Kmu3) / Γ(pipi0) Γ(Kmu3) / Γ(ke3) Anne Dabrowski Northwestern."— Presentation transcript:

1 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 1 “Final” Γ(Ke3) / Γ(pipi0) Γ(Kmu3) / Γ(pipi0) Γ(Kmu3) / Γ(ke3) Anne Dabrowski Northwestern University NA48/2 Analysis Meeting 27 October 2005

2 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 2 Introduction Acceptance, particle ID, Trigger and Backgrounds Table of Systematic Results What we get extract from this result: –Branching fractions for Ke3, and Kmu3 –Kmu3/Ke3 test of theory given measured form factors –Vus Extra Studies –Source of the acceptance change due to generating MC with real gammas –KLOE vs. Ginsberg + PHOTOS MC revisited Conclusion Outline

3 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 3 Measurement of Ratios A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0)

4 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 4 Track 1 pi0 Kaon mass cut Particle ID –electron E/P > 0.95 –pion E/P < 0.95 –muon ID using muon Veto (few other kinematical cuts... can refer to my other talks for details) A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) Principle of the Analysis

5 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 5 Input needed to extract the ratios A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 1.Acceptance 2.Particle ID efficiency 3.Trigger efficiency 4.Number of events in Data 5.Background substraction, done in both signal and normalisation

6 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 6 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) Summary Table of inputs for the ratios Change in acceptance of 1.7% since ICHEP due to effect of real gammas in Ke3 MC

7 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 7 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) Main Contributions to the background Neutrino mass cut sensitive to background when pion decays

8 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 8 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) Main Changes to analysis compared to ICHEP result Reprocessed data  energy baseline correction Alphas and Beta corrections Neutral Vertex method with full Blue Field and projectivity corrections CMC005 (CMC003 at ICHEP) Now simulate real gammas in the ke3 (kmu3) MC ; in ICHEP we used just Ginsberg for ke3 (kmu3)

9 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 9 Contributions to the systematic of ke3/pipi0 We have used Linear form factor model as our reference, but we are ready to use quadratic, or pole model. Difference when varying the linear model by +- 1 σ on the form factors Form factor modelAcceptance Change in Quadratic (ISTRA 2004)-0.00290 +-0.00005 Pole (mv = 0.862+- 0.006 GeV)-0.000250+-0.000005

10 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 10 Contributions to the systematic of kmu3/pipi0 Form factor modelAcceptance Change in Quadratic (ISTRA 2004)-0.000460 +- 0.000005 Pole (mv = 0.862+- 0.006 GeV); (ms =1.87+- 0.030 GeV) -0.000350 +- 0.000006 Form factor model systematic also dominated by the quadratic. Reference parameterisation is linear – ready to switch to pole or quadratic if necessary

11 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 11 Summary of results

12 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 12 Ratio kmu3/ke3

13 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 13 Summary of experimental Results

14 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 14 Extraction of Branching Ratios Using the PDG 2004 value for the branching ratio of pipi0 0.2113 +- 0.0014, Recall PDG: Br(Ke3) = 0.0487 +- 0.0006 Br(Kmu3) = 0.0327 ± 0.0006 The uncertainty is dominated by the pipi0 branching fraction. Recall ICHEP: Br(Ke3): 0.0514 +- 0.0002 (stat) +- 0.0006 (sys)

15 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 15 kmu3/ke3 predicted by theory

16 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 16 Extraction of Vus f+(0) Inputs done for the linear form factor model, but we have available the phase space integrals for the quadratic and the pole form factor models.

17 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 17 Extraction of Vus

18 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 18 Extraction of Vus

19 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 19 Combined Vus Result for NA48/2 |Vus| unitarity was calculated assuming unitarity and given |Vud|=0.9740 ± 0.0005 ** and |Vub| small *** Using f+(0) = 0.9821 +- 0.008 +- 0.002 for K ± * (compared to 0.961 +- 0.008 for K 0 ) * H Leutwyler and M Roos, Z. Phys C 25 (1984) 91. ** (A Czamecki, W.J. Mariano and A Sirlin phys Rev D 70 (2004) 093006 hep-ph/0406324) *** (K Hagiwara et al, Physical Review D 66 (2002))

20 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 20 Additional Studies Effect of real gammas in the Ke3 MC simulation Ginsberg vs (Ginsberg + PHOTOS) (KLOE) Ginsberg + PHOTOS compared to KLOE

21 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 21 Effect of real gammas in Ke3 MC Acceptance effect of 1.7% was seen between Ginsberg (no real gammas simulated) and Ginsberg + PHOTOS (or KLOE) (real gammas simulated). The improvement in the DATA/MC reflected that real gammas did improve the invariant mass of epi0 distribution But effect in the change in acceptance needed to be investigated because we do not cut on the epi0 variable

22 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 22 Effect of real Gammas in MC – Neutrino mass reconstruction The source of this effect is due to the neutrino mass cut (- 0.012 : 0.012 ) GeV ^2, where the neutrino is mis-reconstructed due to the wrong gamma being selected to make the pi0 Visible differences in the tail of the neutrino mass distribution for ke3 for the two MC’s.

23 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 23 Effect of real Gammas in MC – Neutrino mass reconstruction If one removes this cut, the acceptance between Ginsberg and Ginsberg + PHOTOS agree MCRaw Acc with neutrino cut Raw Acc without neutrino cut Ginsberg MC K-0.0749+-0.00020.0765+-0.0002 Ginsberg MC K+0.0747+-0.00020.0764+-0.0002 Ginsberg+PHOTOS K-0.0733+-0.00020.0760+-0.0002 Ginsberg+PHOTOS K+0.0735+-0.00020.0762+-0.0002 Without the cut difference goes away

24 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 24 Ginsberg + PHOTOS is MC of choice DATA/MC  Ginsberg + PHOTOS is MC of choice Better description of the tails when real gammas are simulated

25 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 25 Effect of removing this Neutrino Mass cut in Ke3 This neutrino mass cut is powerful in removing background. Releasing cut, background increases by X25 to –K+ (0.411 +- 0.022) % –K- (0.457 +- 0.031) % And the ratio ke3/pipi0 is absolutely stable. This background is well understood, and can be easily subtracted. (and it is still small) Propose to remove this cut from the official cut … Now that we understand the background so well, it serves no purpose

26 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 26 What about for Kmu3? Firstly, there was almost no acceptance change when comparing Ginsberg and Ginsberg+PHOTOS. The neutrino mass for kmu3 has even tails, and is almost Gaussian. The background in kmu3 is already X20 higher than for ke3 (pions decaying into muons), and releasing this cut would increase the background to about 4%. Propose leaving this cut in for kmu3 analysis

27 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 27 Report on KLOE vs Ginsberg+PHOTOs MC ke3  from Cambridge meeting, showed ridges in KLOE/Ginsberg MC  After checks with C. Gatti (From KLOE), numerical solution solved. Still a slope in the Dalitz plane. This slope will be investigated. Cambridge Now

28 A. Dabrowski, October 27 2005 Ratio(ke3/pipi0); Ratio(kmu3/pipi0) 28 Conclusion Results of the draft version of the paper were shown today. I propose to release the neutrino mass cut in ke3 for final version on the paper, and to leave the neutrino mass cut in for kmu3. Numerical MC issue with KLOE vs. Ginsberg has been resolved. –MC being used at the moment Ke3 Ginsberg + PHOTOS (KLOE also available) Kmu3 Ginsberg + PHOTOS (KLOE MC does not have the lambda0 term of the matrix element yet) Pipi0 KLOE

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