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JOLANTA BRODZICKA Institute of Nuclear Physics, Krakow July 09, 2003 Doubly charmed B decays B D*DK ( for ~90 fb -1 )

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Presentation on theme: "JOLANTA BRODZICKA Institute of Nuclear Physics, Krakow July 09, 2003 Doubly charmed B decays B D*DK ( for ~90 fb -1 )"— Presentation transcript:

1 JOLANTA BRODZICKA Institute of Nuclear Physics, Krakow July 09, 2003 Doubly charmed B decays B D*DK ( for ~90 fb -1 )

2 JOLANTA BRODZICKA July 09, 2003 B D* D K Analysis details good charged tracks with abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm R 2 < 0.3 K ± : P( K/ ) > 0.4 ± : P( /K ) > 0.1 electron veto: el_id < 0.95 K 0 S abs( M( + - ) - M Ks ) < 15 MeV only good_Ks 0 E > 50 MeV abs( M( ) -M 0 ) < 15MeV D 0 reconstr. ( p(D) < 2 GeV in (4S) system ) D* ±, D* 0 reconstr. ( p(D*) < 2 GeV in (4S) system ) B ±, B 0 reconstr. B vertex fit: with IP and B lifetime constraints BF ~ 28% ( K, K3, K 0, K s, K s KK, KK ) M (D REC ) cut: ± 20MeV ( D 0 K 0 : ± 50MeV) vertex fit (conf_level>0.), mass constraint fit D * ± D 0 ± ( D * ± D ± 0 hopeless ) D * 0 D 0 0 ( D * 0 D 0 difficult ) abs(M(D* ± )-M(D)- m PDG )< 2.5MeV abs(M(D* 0 )-M(D)- m PDG )< 5MeV vertex fit (conf_level>0.), mass constraint fit

3 JOLANTA BRODZICKA July 09, 2003 B D* D K D*0 D0 gamma for 20K MC signal events: D*0D0K± with D0 K D*0 D0 ~ 5% E Mbc N/1MeV N/2MeV M

4 JOLANTA BRODZICKA July 09, 2003 B D* D K D*0 D0 gamma data (for exp 17)

5 JOLANTA BRODZICKA July 09, 2003 B D* D K best B candidate choice method B(M D ) LR_D (M D ) LR_D (M D ) = S(M D ) + D probability : S(M D ), B(M D ) parameterization from M D fit B probability for : LR_B = LR_D(*) 1 × LR_D(*) 2 best B candidate : with max LR_B LR_D * ( M D * ) = LR_D * ( M D * ) =D* probability : S( M D * ) B( M D * ) + S( M D * ), B( M D * ) parameterization from M D * fit LR_B cut used also for background discrimination

6 JOLANTA BRODZICKA July 09, 2003 B D* D K B0 D*± D0 K± LR > 0.05 Fully reconstructed signal (from 2-dim Mbc vs. E likelihood fit) XNSIG_ ± XE0_ E-02 ± E-02 XEW_ E-02 ± E-02 XM0_ ± E-03 XMW_ E-02 ± E-03 S = 55.9 ± 8.7 eff = 2.94 * BF = ( 1.98 ± 0.31 ) * (stat. error) Plot for Mbc>5.27GeV Plot for abs( E)<25MeV E Mbc N/7.5MeV N/2MeV

7 JOLANTA BRODZICKA July 09, 2003 B D* D K M 2 ( D0K± ) M 2 ( D*±D0 ) Mbc sideband events M ( D*±D0 ) M ( D0K± ) M ( D*±K ) Dalitz plot for B0 D*± D0 K± for signal-box events: abs( E) 5.27GeV N/10MeV

8 JOLANTA BRODZICKA July 09, 2003 B D* D K B± D*0 D0 K± ( with right D*K flavor combination ) LR > 0.01 Plot for Mbc>5.265GeV Plot for abs( E)<45MeV E Mbc Fully reconstructed signal (from 2-dim likelihood fit) XNSIG_ ± XE0_ E-03 ± E-02 XEW_ E-01 ± E-02 XM0_ ± E-02 XMW_ E-02 ± E-03 S = 33.9 ± 8.6 Signif.= 7.3 eff = 0.63 * BF = ( 5.61 ± 1.42 ) * (stat. error) N/7.5MeV N/2MeV

9 JOLANTA BRODZICKA July 09, 2003 B D* D K Dalitz plot for B± D*0 D0 K± for signal-box events: abs( E) 5.265GeV M 2 ( D*0D0 ) M 2 ( D*0K± ) M ( D*0K± ) M ( D*0D0 ) M ( D0K± ) Mbc sideband events N/10MeV

10 JOLANTA BRODZICKA July 09, 2003 B D* D K B± D*± D0 K0s LR > Fit results for directly reconstr. signal (from 2-dim Mbc vs. E likelihood fit) XNSIG_ ± XE0_ E-04 ± E-02 XEW_ E-02 ± E-02 XM0_ ± E-03 XMW_ E-02 ± E-03 S = 28.5 ± 6.3 Signif. = 7.9 Plot for Mbc>5.27GeV Plot for abs( E)<25MeV N/2MeV N/7.5MeV E Mbc

11 JOLANTA BRODZICKA July 09, 2003 B D* D K Dalitz plot for B± D*± D0 K0s for signal-box events: abs( E) 5.27GeV M 2 ( D*±K0s ) M 2 ( D*±D0 ) M ( D0K0s ) M ( D*±D0 ) M ( D*±K0s ) Mbc sideband events N/10MeV

12 JOLANTA BRODZICKA July 09, 2003 B D* D K B± D*0 D(*) K± 4 channels: D*0 D0 K± LR>0.02 D*0 D*0 K± LR>0.0 D*0 D± K± LR>0.001 D*0 D*± K± LR>0.0 XNSIG_ ± XE0_ E-02 ± E-02 XEW_ E-01 ± E-02 XM0_ ± E-03 XMW_ E-02 ± E-03 E Mbc M ( D*0K± ) for signal-box events Mbc sideband events


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