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BR( f  h g ) with p + p - 7 g

20/02/2004. BR( f  h g ) with p + p - 7 g. Camilla Di Donato INFN Napoli. BR( f  h g ) measurement. BR( f  h  g ) measured on 2000 data p + p - 3 g : Phys. Lett. B541 (2002) p + p - 7 g : km 268 and analysis update with referee suggestions

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BR( f  h g ) with p + p - 7 g

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  1. 20/02/2004 BR(fhg) with p+p- 7g Camilla Di Donato INFN Napoli

  2. BR(fhg) measurement BR(fhg) measured on 2000 data • p+p-3g : Phys. Lett. B541 (2002) • p+p-7g : km 268 and analysis update with referee suggestions • crg h hp+p-andh p0p0p0 • ntr h hp0p0andh p+p-p0 BR(fhg) and P evaluation on 2001- 2002 data; Lint =449 pb-1 Camilla - Rad. Meeting 20-02-04

  3. BR(fhg) measurement Update the old analysis • Analysed 449pb-1 from 2001-2002 data collection • time window = min(5st,2ns) • EMC-MC threshold • accidentals in DC • input kin.fit: pull • cut on cosqpp<-0.9 and on Ep+p-removed • Analysis of background cosqpp 1 with didone • Systematic error evaluation completed (excluding VTX) Camilla - Rad. Meeting 20-02-04

  4. Barrel Ecap West Barrel Ecap West Ecap East Ecap East Trigger-FILFO-EVCL We check Trigger FILFO and Event Classification • Trigger: eMC(crg) = 99.7%; eMC(ntr) = 99.9% On events selected by the analysis we found eMC =100% Camilla - Rad. Meeting 20-02-04

  5. Trigger-FILFO-EVCL • FILFO-EVCL on triggered events: eMC(crg) = 57.88%; eMC(ntr) = 61.45% We check the efficiency mc value performing the analysis on unbiased sample (1/5 of 2002 data) in order to evaluate a systematics. We find (eMC – edata)/ eMC =2% Camilla - Rad. Meeting 20-02-04

  6. Topological selection • eMC(crg) = (19.61±0.05)%; eMC(ntr) = (20.56±0.08)% Camilla - Rad. Meeting 20-02-04

  7. 2001- 2002: Lint =449 pb-1 Nob.ev. = 3863±62 From MC study we estimated the expected background: Ks p+ p- ; Kl p0 p0 p0 Nbg1 = 64 Ks p0p0 ; Kl p+ p- p0 Nbg2 = 168 Ks p+ p- g; Kl p0 p0 p0 Nbg1 = 141 Nh’g= Nob.ev. - Nbg Nh’g = 3490±62 Camilla - Rad. Meeting 20-02-04

  8. Ks p+ p- Kl p0 p0 p0 Ks p+ p- g Kl p0 p0 p0 Signal Ks p0 p0 Kl p+ p- p0 Nob.ev. = 3863±62 Ep++Ep+ (MeV) c2/Ndf Camilla - Rad. Meeting 20-02-04

  9. Ks p+ p- Kl p0 p0 p0 Ks p+ p- g Kl p0 p0 p0 Signal Ks p0 p0 Kl p+ p- p0 Mh is obtain from the “best” 3 grad Right grad 80% Egrad(MeV) Mh(MeV) Camilla - Rad. Meeting 20-02-04

  10. 4% (due to BR” from PDG’02) • D(N/e)/(N/e) 1.5% • Filfo-Evcl 2% Results • Nh’g = 3490±62 • Nf = Lint•s(e+e-f)  4% • Lint= 449 pb-1 1% • s(e+e-f)=(3.340.01 0.12)mb (Kn177 Simona and Stefano) Camilla - Rad. Meeting 20-02-04

  11. Results • BR(fhg) = (6.04±0.10±0.36)•10-5 p+p-3g : Phys. Lett. B541 (2002) BR(fhg) = (6.10±0.61±0.43)•10-5 • R= BR(fhg)/BRPDG02(fhg)  P (Bramon) • Mixing angle evaluation Camilla - Rad. Meeting 20-02-04

  12. Conclusions and Outlooks • We look at the full KLOE statistic; • BR(fhg) measurement almost completed: to be check vtx effect on systematics; • Pseudoscalar mixing angle evaluated; • A Kloe Memo is in preparation (I need to discuss with Simona and Paolo, my referee) Camilla - Rad. Meeting 20-02-04

  13. Unbiased sample ……… ……………for Filfo-Evcl study • 2002: done 29 pb-1 run 27000-27137 11 pb-1 (all runs) run 23557-25967 18 pb-1 (one run each ten) • 2001: to be done run 17868-23010 datarec V13  11 pb-1 run 18345-23129 datarec V14  8 pb-1 Camilla - Rad. Meeting 20-02-04

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