Ponza 05 June 2008

1. Status report on  analysis F. Ambrosino T. Capussela F. Perfetto Frascati 16 January 2009 Ponza 05 June 2008 Status report on  analysis

2. OLD approach NEW approach OLD approach NEW approach Summary of 29/09/2008 meeting OLD approach NEW approach • Whichare the future plans: • Understand the slope in the wrong pairing (w.p.) • Select the approach in whichtogive the result = 0.027  0.004 = 0.036  0.003 Frascati 16 January 2009 Ponza 05 June 2008

3. Solutionnewapproach In ordertounderstand the presenceof the slope in the w.p.fitwehavegenerated MC sampleswithdifferentavalues in input. Wefind: NEW APPROACH Ponza 05 June 2008

4. Slope Wrong pairing new approach a =0 a =-0.032 a =-0.040 a =-0.048 Frascati 16 January 2009 Ponza 05 June 2008 Status report on  analysis

5. Solutionoldapproach OLD APPROACH Frascati 16 January 2009 Ponza 05 June 2008

6. Slope Wrong pairing old approach a =0 a =-0.032 a =-0.040 a =-0.048 Frascati 16 January 2009 Ponza 05 June 2008 Status report on  analysis

7. OLD APPROACH NEW APPROACH Preliminary Results old – new approach Frascati 16 January 2009 Ponza 05 June 2008 Status report on  analysis

8. a =0 Residuals new approach a =-0.032 a =-0.040 a =-0.048 Ponza 05 June 2008 Status report on  analysis

9. Conclusions: • I haveunderstandthe presenceof the slopein the wrong pairing (w.p.) • I amevaluatinga in the twoapproaches and for the differentsamples. Conclusions & Future plans • Which are the future plans: • In the next week, I’llspeakwith the referees in ordertoselect the approach in whichtogive the result • Finallytopublish!!!! • In february, I’ll go in Uppsalato collaborate withKupsc. • “We” wanttofit the Dalitz plot of+- in orderto investigate possiblecuspeffect in 00 Frascati 16 January 2009 Ponza 05 June 2008

10. KLOE preliminary arXiv 0707.4137 Results = 0.027  0.004stat+ 0.0040.006syst

11. Pur  75.4% Eff  30.3 % No cut on 2 and 2 Low purity Samples Pur  84.5% Eff  22 % 2 < 10 2 > 1.2 Medium purity I Pur  92 % Eff  13.6 % 2 < 5 2 > 3 Medium purity II Pur  94.8% Eff  9.2 % 2 < 3 2 > 4 Medium purity III Pur  97.6% Eff  4.3 % 2 < 2 2 > 7 High purity Frascati 19 Luglio 2007 Dalitz plot analysis of with the KLOE experiment

12. NEW approach: • 7 and only 7 pnc with 21° <  < 159°and E> 10 MeV • g > 18° • Kin Fit with h mass constraint (onDATAMh = 547.874 MeV/c2 ) • P(2) > 0.01 • 320 MeV < Erad < 400 MeV AFTER PHOTON’S PAIRING • Kinematic Fit with p0mass constraint • OLD approach: • 7 and only 7 pnc with 21° <  < 159°and E> 10 MeV • g > 18° • Kin Fit with no mass constraint • P(2) > 0.01 • 320 MeV < Erad < 400 MeV AFTER PHOTON’S PAIRING • Kinematic Fit with h and p0mass constraints (on DATA Mh = 547.822 MeV/c2 ) Selection

13. Using the same cuts on c min and Dc : Pur  75.4% Pur  82.2% Low purity Medium I purity Purity Old – New Pur  84.5% Pur  89.4% Pur  92% Pur  95.1% Medium II purity Medium III purity Pur  94.8% Pur  97.1% Pur  99% Pur  97.6% High purity Ponza 05 June 2008 Status report on analysis