B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 1

Charged kaon meeting LNF - February, 3rd 2004

B.Sciascia

TagBias Bug on error calculation Sensitivity with 8pb-1 MC

K2

-Tracking vs K-Tracking

Kl3

Selection Fit ......

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 2

K Tag Bias

K 1.16 0.03

0.1

K e 0.5 0.2 0.6

K 1.8 0.3 0.7

K 1.31 0.09

0.2

K 5.0 0.4 1.

K 18.4 0.2

0.7

K 1.15 0.03

0.1

K e 0.8 0.2 0.6

K 1.2 0.3 0.7

K 1.1 0.09 0.2

K 4.5 0.4 1.

K 17.4 0.2 0.7

Tag K Signal K Tag K Signal K

MC: 96 pb-1

(480 pb-1 of Data equiv.)

MC: 8 pb-1 Run 26700-27020 (40 pb-1 of Data equiv.)

-Tag -Trg

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 3

-Tracking vs K-Tracking Reconstruction:

FilFo

-Tracking

EvCl 1 (5 Algos)

“Kaon joining”

EvCl 2 (5 Algos)

K-Tracking

Correlation (MC)

1.0446 0.0002

1.0504 0.0002

K+ TagBias (MC)

0.9914 0.0004

0.9885 0.0003

K- TagBias (MC)

0.9918 0.0004

0.9884 0.0003

SELE (K) 20.02 0.01 22.06 0.01 SELE (K+) 20.57 0.01 22.71 0.01

BR(K )63.42 0.04

63.90 0.04

BR(K+ +)64.40 0.04

64.82 0.04

-Trk vs K-Trk Abs. Rel.

BR(K-) - 0.48

0.75

BR(K+) - 0.42

0.75

Systematics: to be studied

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 4

Kl3 selection (1) “Usual” -Tag Track:

- KTRK + V2 + dTRK + Good_Extrap. - p(m) 190MeV (2-body rejec.) - Asso. cluster

0 : - 2 not-asso cluster - (t) wrt VTX 1 ns

- minv. mass ToF selection

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 5

Kl3 Selection (2)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 6

All selected

2001-2002- tag No AutoTrg

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 7

“Pezzetto” effect

Correction for e+e- only

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 8

All selected: -trig

2001-2002 tag -Trg

MC K- K+

Ke3 13.3%

13.5%

K3 12.5%

12.7%

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 9

Cluster smearing

“Cluster+Vertex” smearing: K- t 130ps = 60ps 115ps K-Vtx 0.7cm K+ t 120ps = 60ps 104ps K-Vtx 0.6cm

Data

MC

Data

MC smeared

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 10

Fit to m2 distribution (1)

Input histograms

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 11

Fit to m2 distribution (2)

Data: 20 Pb-1 (Run 26601-26780) MC: 2001+2002 stat. (96 Pb-1)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 12

Nkl3/Ntag stability

Only DATA: Run 25991-27147 (120 Pb-1)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 13

Fit to K- m2 distribution Data 2002 MC 2002

Check: Data = MC 2001; MC = MC 2002 • BR(K-0e-) = (4.84 0.06)• BR(K-0-) = (3.30 0.06)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 14

Fit to K+ m2 distribution Data 2002 MC 2002

Check:Data = MC 2001; MC = MC 2002• BR(K0e) = (5.06 0.06)• BR(K0) = (3.29 0.06)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 15

Kl3 2002 sample

Data: 2002 MC: 2002

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 16

“Efficiency” (1)

MC Tot Trk+V+Extr 2-body Asso 0 ToF

K-e3 13.3% 22.5% 85.8% 93.0% 82.5% 89.6%

K-3 12.5% 21.2% 92.9% 85.5% 82.4% 89.7%

K+e3 13.4% 22.6% 85.7% 93.2% 82.5% 89.7%

K+3 12.7% 21.4% 92.9% 85.9% 82.5% 90.0%

Efficiency TIMES Acceptance MC 2001-2002 -Tag -Trg

Tracking (see Vincenzo talk) Vertex (see Patrizia talk)Trk-to-clu asso

ToF

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 17

“Efficiency” (2) Data 2002- tag, no autoTrg

K-l3 K+

l3

“dEdx game”? (see PaoloB talk)

B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 18

TagBias update

Waiting for “New MC”: - Small sample (Run 26700-27020) - HW+Tracking efficiencies (ready) - on EMC (by A.A., C.B, M.T, and T.S., ready) - and K on EMC (by M.A., C.B, M.T, and T.S., almost ready) - . . . .

Conclusions

Efficiencies and Systematics . . .

First check on Trk 1/Trk 2; EvCl 1/EvCl 2 difference

K semileptonic decay - Work in progress (Christmas-stop + AFS-stop) - 2001-2002 Data sample - Fit to m2 distribution