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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

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 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


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


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%


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


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2000

BACKGROUND

cosq






Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2000

Ep+ +Ep- (MeV)


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2000

Eg(MeV)


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2000

c2/Ndof


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


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%


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2001

cosq


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2001

Ep+ +Ep- (MeV)


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2001

Eg(MeV)


Ks p0 p0

Kl p+p-p0

Ks  p+p-g

Kl p0p0p0

data

2001

c2/Ndof


2000/2001/2002

c2/Ndof

2000

2001

2002

Ep+ +Ep- (MeV)


2002

cosq


2002

Ep+ +Ep- (MeV)


2002

c2/Ndof


Conclusions

  • 2000: analysis updated with referees’

  • useful suggestions

  • 2001: systematics under study

  • 2002: ntuples ready

  • 2001/2002: evcl -> discussion


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