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Status report on f  h ’ g

Status report on f  h ’ g. Camilla Di Donato I.N.F.N. Napoli. Frascati 13/02/2003. Summary. 2000: ˜17 pb-1 2001: ˜108 pb-1 2002: ˜223 pb-1. Ks  p + p - Kl  p 0 p 0 p 0. 2000. KLOE memo n.268: update at the end of feb. time window = min(5 s t ,2ns)

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Status report on f  h ’ g

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  1. Status report on f  h’ g Camilla Di Donato I.N.F.N. Napoli Frascati 13/02/2003

  2. Summary • 2000: ˜17 pb-1 • 2001: ˜108 pb-1 • 2002: ˜223 pb-1

  3. Ks p+p- Kl p0p0p0 2000 • KLOE memo n.268: • update at the end of feb. • time window = min(5st,2ns) • EMC-MC threshold • time calibration 2000 data • accidentals in DC (mbckadd) • input kin.fit: pull • more stat. mc background • cut on cosqpp<-0.9 removed

  4. 2000 New mc efficiency: e SGN 20.46% s/b N BG1 1,93x10-7(90% c.l.) >252 <0,5 BG2 2,75x10-5 6 20 BG3 29x10-5 24 5,5 N(2000) = 179 (no bg subtracted) Nh’g = N(2000)-Nbg = 179 – 25.5 = 153.5

  5. 2000 Systematics: De/e filfo 1.1% evcl 1.75% vertex 1.4% Total 2.5% D(N/e) /(N/e) Dz =±15% ±0.4% Dq =±1° ±4% DE =±10% -0.4%/+3.0% c2/Ndof (±1) -0.4%/+2.5% Total -4%/+6%

  6. P.L.B541(2002):BR(f  h’ g)=(6,10 ± 0,61 ± 0,43 )x10-5 2000 Systematics: BR’’ 3% luminosity 1%-2% cross section 2.5% total 4.5% BR(f  h’ g)=(7,05 ± 0,50 )x10-5 +0,53 -0,46

  7. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2000 BACKGROUND cosq

  8. 2000

  9. 2000

  10. 2000

  11. 2000

  12. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2000 Ep+ +Ep- (MeV)

  13. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2000 Eg(MeV)

  14. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2000 c2/Ndof

  15. BR(f  h’ g)=(6,20±0,19)x10-5 2001 Lint = 108pb-1 e Nbg BG1 1.93x10-7(90% c.l.) < 3 (90% c.l.) BG2 2.75x10-5 127 BG3 29x10-5 35 N(2001) = 1046 (no bg subtracted) Nh’g = N(2001)-Nbg = 1046 – 162 = 884

  16. 2001(2) Systematics: De/e filfo - evcl - vertex - D(N/e) /(N/e) Dz =±15% - Dq =±1° 2% DE =±10% - c2/Ndof (±1) -0,5%/+1,5% BR’’ 3% luminosity 1%-2% cross section 2.5%

  17. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2001 cosq

  18. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2001 Ep+ +Ep- (MeV)

  19. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2001 Eg(MeV)

  20. Ks p0 p0 Kl p+p-p0 Ks  p+p-g Kl p0p0p0 data 2001 c2/Ndof

  21. 2000/2001/2002 c2/Ndof 2000 2001 2002 Ep+ +Ep- (MeV)

  22. 2002 cosq

  23. 2002 Ep+ +Ep- (MeV)

  24. 2002 c2/Ndof

  25. Conclusions • 2000: analysis updated with referees’ • useful suggestions • 2001: systematics under study • 2002: ntuples ready • 2001/2002: evcl -> discussion

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