Charged kaon meeting LNF - February, 3rd 2004 B.Sciascia TagBias Bug on error calculation Sensitivity with 8pb-1 MC Km2 p-Tracking vs K-Tracking Kl3 Selection Fit ...... B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 1 K m Tag Bias Tag K Signal K m-Tag m-Trg Tag K Signal K K m 1.15 0.03 0.1 K m 1.16 0.03 0.1 K pe 0.8 0.2 0.6 K pe 0.5 0.2 0.6 K pm 1.2 0.3 0.7 K pm 1.8 0.3 0.7 K pp 1.1 0.09 0.2 K pp K ppp 4.5 0.4 1. K ppp 5.0 0.4 1. K ppp 17.4 0.2 0.7 K ppp 18.4 0.2 0.7 MC: 96 pb-1 (480 pb-1 of Data equiv.) B.Sciascia 1.31 0.09 0.2 MC: 8 pb-1 Run 26700-27020 (40 pb-1 of Data equiv.) Kpm Meeting - LNF - February, 3rd 2004 2 p-Tracking vs K-Tracking Reconstruction: FilFo p-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 eSELE (K) 20.02 0.01 22.06 0.01 eSELE (K+) 20.57 0.01 22.71 0.01 BR(K m) 63.42 0.04 63.90 0.04 BR(K+ m+) 64.40 0.04 64.82 0.04 Systematics: to be studied p-Trk vs K-Trk Abs. Rel. DBR(K-) - 0.48 0.75 DBR(K+) - 0.42 0.75 B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 3 Kl3 selection (1) “Usual” m-Tag Track: - KTRK + V2 + dTRK + Good_Extrap. - p(mp) 190MeV (2-body rejec.) - Asso. cluster p0 : - 2 not-asso cluster - D(dt) wrt VTX 1 ns - mgg inv. mass ToF selection B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 4 Kl3 Selection (2) B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 5 All selected 2001-2002 p-m tag No AutoTrg B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 6 “Pezzetto” effect Correction for e+e- only B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 7 All selected: m-trig 2001-2002 m tag m-Trg K- K+ Ke3 13.3% 13.5% Km3 12.5% 12.7% aeMC B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 8 Cluster smearing Data Data MC MC smeared “Cluster+Vertex” smearing: K- st 130ps = 60ps 115ps sK-Vtx 0.7cm K+ st 120ps = 60ps 104ps sK-Vtx 0.6cm B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 9 Fit to m2 distribution (1) Input histograms B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 10 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 11 Nkl3/Ntag stability Only DATA: Run 25991-27147 (120 Pb-1) B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 12 Fit to K- m2 distribution Data 2002 MC 2002 Check: Data = MC 2001; MC = MC 2002 • BR(K-p0e-) = (4.84 0.06) • BR(K-p0m-) = (3.30 0.06) 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(Kp0e) = (5.06 0.06) • BR(Kp0m) = (3.29 0.06) B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 14 Kl3 2002 sample Data: 2002 MC: 2002 B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 15 “Efficiency” (1) Efficiency TIMES Acceptance MC 2001-2002 m-Tag m-Trg MC eTot eTrk+V+Ext e2-body eAsso ep0 eToF K-e3 13.3% 22.5% 85.8% 93.0% 82.5% 89.6% K-m3 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+m3 12.7% 21.4% 92.9% 85.9% 82.5% 90.0% r Tracking (see Vincenzo talk) Vertex (see Patrizia talk) Trk-to-clu asso p ToF B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 16 “Efficiency” (2) Data 2002 p-m tag, no autoTrg K-l3 K+l3 “dEdx game”? (see PaoloB talk) B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 17 Conclusions TagBias update Waiting for “New MC”: - Small sample (Run 26700-27020) - HW+Tracking efficiencies (ready) - m on EMC (by A.A., C.B, M.T, and T.S., ready) - p and K on EMC (by M.A., C.B, M.T, and T.S., almost ready) -.... 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 Efficiencies and Systematics . . . B.Sciascia Kpm Meeting - LNF - February, 3rd 2004 18
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