status report on f h ’ g
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
Status report on Status report on ’’
Status report on Status report on ’’
Camilla Di DonatoCamilla Di DonatoI.N.F.N. NapoliI.N.F.N. Napoli
Frascati 13/02/2003
• 2000: ˜17 pb-1 2000: ˜17 pb-1
• 2001: ˜108 pb-1 2001: ˜108 pb-1
• 2002: ˜223 pb-1 2002: ˜223 pb-1
SummarySummary SummarySummary
2000200020002000
KLOE memo n.268: update at the end of feb.
•time window = min(5t,2ns)•EMC-MC threshold•time calibration 2000 data•accidentals in DC (mbckadd)•input kin.fit: pull•more stat. mc background•cut on cos<-0.9 removed
Ks
Kl
Ks
Kl
2000200020002000
New mc efficiency: SGN 20.46% s/b N BG1 1,93x10-7 (90% c.l.) >252 <0,5 BG2 2,75x10-5 6 20BG3 29x10-5 24 5,5
N(2000) = 179 (no bg subtracted)
N’= N(2000)-Nbg = 179 – 25.5 = 153.5
2000200020002000
Systematics: /
filfo 1.1% evcl 1.75% vertex 1.4%Total 2.5%
(N/) /(N/)z =±15% ±0.4%=±1° ±4%E =±10% -0.4%/+3.0%2/Ndof (±1) -0.4%/+2.5%
Total -4%/+6%
2000200020002000
Systematics: BR’’ 3% luminosity 1%-2% cross section 2.5%
total 4.5%
BR(BR(’’)=(7,05 ± 0,50 )x10)=(7,05 ± 0,50 )x10-5-5BR(BR(’’)=(7,05 ± 0,50 )x10)=(7,05 ± 0,50 )x10-5-5+0,53+0,53-0,46-0,46
P.L.B541(2002)P.L.B541(2002):: BR(BR(’’)=(6,10 ± 0,61 ± 0,43 )x10)=(6,10 ± 0,61 ± 0,43 )x10-5-5P.L.B541(2002)P.L.B541(2002):: BR(BR(’’)=(6,10 ± 0,61 ± 0,43 )x10)=(6,10 ± 0,61 ± 0,43 )x10-5-5
2000200020002000
BACKGROUND
cos
Ks
Kl
Ks Kl
data
2000200020002000
2000200020002000
2000200020002000
2000200020002000
2000200020002000
Ks
Kl
Ks Kl
data
EE(MeV)
2000200020002000Ks
Kl
Ks Kl
data
E(MeV)
2000200020002000Ks
Kl
Ks Kl
data
2/Ndof
2001200120012001
Lint = 108pb-1
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)
N’= N(2001)-Nbg = 1046 – 162 = 884
BR(BR(’’)=(6,20±0,19)x10)=(6,20±0,19)x10-5-5BR(BR(’’)=(6,20±0,19)x10)=(6,20±0,19)x10-5-5
2001(2)2001(2)2001(2)2001(2)
Systematics: / filfo - evcl - vertex -
(N/) /(N/)z =±15% -=±1° 2%E =±10% -2/Ndof (±1) -0,5%/+1,5%
BR’’ 3% luminosity 1%-2% cross section 2.5%
2001200120012001Ks
Kl
Ks Kl
data
cos
2001200120012001Ks
Kl
Ks Kl
data
EE(MeV)
2001200120012001Ks
Kl
Ks Kl
data
E(MeV)
2001200120012001Ks
Kl
Ks Kl
data
2/Ndof
2000/2001/20022000/2001/20022000/2001/20022000/2001/2002
EE(MeV)
2/Ndof
200020012002
2002200220022002
cos
2002200220022002
EE(MeV)
2002200220022002
2/Ndof
•2000: analysis updated with referees’ 2000: analysis updated with referees’ useful suggestions useful suggestions •2001: systematics under study2001: systematics under study•2002: ntuples ready2002: ntuples ready•2001/2002: evcl -> discussion2001/2002: evcl -> discussion
ConclusionsConclusionsConclusionsConclusions