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Status Report on f  h g  p + p - 7 g

Status Report on f  h g  p + p - 7 g. Status Report. The branching ratio measurement is ready R=BR ( f  h  g ) /BR ( f  hg ); Filfo-EVCL efficiency measured on data; Systematics related to TRK-VTX on the control sample f  p + p - p 0 ; MC’04 studied;

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Status Report on f  h g  p + p - 7 g

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  1. Status Report on f  hg  p+p- 7g

  2. Status Report • The branching ratio measurement is ready • R=BR(fhg)/BR(fhg); • Filfo-EVCL efficiency measured on data; • Systematics related to TRK-VTX on the control sample f p+ p- p0 ; • MC’04 studied; • Discussion with referee  work in progress. • Mixing angle evaluation

  3. BR(fhg) measurement BR(fhg) with p+p-7g : • crg h hp+p-andh p0p0p0 • ntr h hp0p0andh p+p-p0 BR(fhg) measurement and P evaluation on 2001-2002 data, run 17874-26965; Lint =427 pb-1 We look at thefhgwithhp0p0p0

  4. EVCL-Filfo Using 40pb-1 selected with a minimum bias procedure and without EVCL and Filfo (see kloe memo 365) we measure eEVCL-Filfo on data and we use the results directly in the ratio R • With ktagVeto(EVCL) • With Ep++Ep-<500MeV

  5. TRK-VTX efficiency We use fp+p-p0 as control sample for track-vertex efficiency run 21524-22745; Lint =9 pb-1 mc mc fp+p-p0 fhg Pp MeV Pp MeV

  6. TRK-VTX efficiency We ask for: • one track with 200 < Ptrk < 400 MeV, associated to a cluster in the calorimeter; • two prompt neutral clusters over 25º with 87 < Mgg < 183 MeV TRK and VTX efficiency as function of missing momentum

  7. MC DATA TRK efficiency • we look for a track in a cone (20º) around the direction of missing momentum

  8. TRK efficiency A0=0.6±1.3% (50:250)MeV emc-erd/ emc1.3% A0=0.5±0.8% (10:500)MeV

  9. MC DATA VTX efficiency • We look for a vertex connected between the tracks

  10. VTX efficiency

  11. VTX efficiency A0=-1.3±1.4% (50:250)MeV emc-erd/ emc1.4% A0=-0.7±0.9% (10:500)MeV

  12. Accidentals (h) Signal: we compare MC efficiency with and without validate cluters procedure, using dtr_stream_code = ‘mrc’ AND mc_card_code = ‘rad04’ and we found difference at the level of 0.5% on the selection efficiency Validate cluters: we use efficiency table from S. Miscetti to solve the clusters background problem in rad04 (by Paolo Massarotti)

  13. Background (h) Possible background can be produced by f KsKl: • Ks p+ p- ; Kl p0 p0 p0 • Ks p0p0 ; Kl p+ p- p0 • Ks p+ p- g; Kl p0 p0 p0

  14. Background subtraction (h) We observed Nob.ev.= (3750 ± 61) no background subtracted. From MC study the expected background is Nbg =Nbg1 +Nbg2+Nbg3 = 59+155+131 it’s at level of 9.2% on Nob.ev.; from MC’04 with right machine background simulation, but low statistic, the expected Nbg is at level of 8.5% on Nob.ev.. We use the discrepancy as systematics, it’s at level of 7.5% on Nbg, so Nbg=34528 Nh’g = Nob.ev. - Nbg= 3405 ± 61stat ± 28syst

  15. fhgwithhp0p0p0 We observed Nev.=(1665000±1300) f with 7g, with a selection efficiency of (28.170.04%) From MC study we estimated a background at level of 1•10-7 Nf @90% C.L. (F.Perfetto Degree Thesis) eMC*eFE=28.78%*97.88%

  16. We measure the ratio R where c2/Ndf eh/eh' TRK VTX bg BR" Filfo-EVCL

  17. BR(fhg) measurement

  18. Conclusions (I) • We look at the full 2001-2002 KLOE statistic; • EVCL-Filfo systematics using 10% of the analysed data; • MC’04 systematics on background subtraction; • VTX –TRK efficiency with f p+p-p0 • BR(fhg) measurement completed, using fhg with h p0 p0 p0: we measured the ratio R=BR(fhg)/ BR(fhg)

  19. Conclusions (II) We found • BR(fhg) =(6.16±0.10stat±0.28sys)•10-5 to be compared with BR(fhg) = (6.10±0.61±0.43)•10-5 measured with p+p-3g (our Phys. Lett. B541 (2002)) • Mixing angle P  40°

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