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JOLANTA BRODZICKA

Doubly charmed B decays. B  D*DK. ( for ~90 fb -1 ). July 09, 2003. JOLANTA BRODZICKA. Institute of Nuclear Physics, Krakow. Analysis details. good charged tracks with abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm R 2 < 0.3

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JOLANTA BRODZICKA

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

  2. Analysis details • good charged tracks with abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm • R2< 0.3 • K± : P(K/) > 0.4± : P(/K) > 0.1 electron veto: el_id < 0.95 • K0Sabs( M(+ -) - MKs ) < 15 MeV only good_Ks • 0 E > 50 MeV abs( M( ) -M0 ) < 15MeV • D0 reconstr. ( p(D) < 2 GeV in (4S) system) • D*±, D*0 reconstr. ( p(D*) < 2 GeV in (4S) system) • B±, B0 reconstr. B vertex fit: with IP and B lifetime constraints • BF ~ 28% ( K , K3 , K0 , Ks , KsKK , KK ) • M (DREC) cut: ± 20MeV (D0 K0 : ± 50MeV) • vertex fit (conf_level>0.) , mass constraint fit • D*±  D0±(D*±  D± 0hopeless ) D*0  D00 ( D*0  D0 difficult ) • abs(M(D*±)-M(D)-mPDG)< 2.5MeV abs(M(D*0)-M(D)-mPDG)< 5MeV • vertex fit (conf_level>0.) , mass constraint fit JOLANTA BRODZICKA B  D* D K July 09, 2003

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

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

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

  6. B0  D*± D0 K± LR > 0.05 Plot for Mbc>5.27GeV Fully reconstructed signal (from 2-dim Mbc vs.E likelihood fit) N/7.5MeV XNSIG_1 55.987 ± 8.7574 XE0_1 -0.24556E-02 ± 0.12705E-02 XEW_1 0.75556E-02 ± 0.10427E-02 XM0_1 5.2814 ± 0.48261E-03 XMW_1 0.28011E-02 ± 0.39069E-03 E Plot for abs(E)<25MeV N/2MeV S = 55.9 ± 8.7 eff= 2.94 *10-4 BF = ( 1 .98 ± 0.31 ) * 10-3(stat. error) Mbc JOLANTA BRODZICKA B  D* D K July 09, 2003

  7. Dalitz plot for B0  D*± D0 K± forsignal-box events:abs(E)<25MeV Mbc>5.27GeV M2 ( D0K± ) M2 ( D*±D0 ) M ( D0K± ) Mbc sideband events N/10MeV M ( D*±K ) M ( D*±D0 ) JOLANTA BRODZICKA B  D* D K July 09, 2003

  8. B± D*0 D0 K± ( with right D*K flavor combination ) LR > 0.01 Plot for Mbc>5.265GeV Fully reconstructed signal (from 2-dimlikelihood fit) N/7.5MeV XNSIG_1 33.919 ± 8.5969 XE0_1 0.17777E-03 ± 0.49329E-02 XEW_1 0.16508E-01 ± 0.33500E-02 XM0_1 5.2821 ± 0.11272E-02 XMW_1 0.38005E-02 ± 0.96413E-03 E Plot for abs(E)<45MeV N/2MeV S = 33.9 ± 8.6 Signif.= 7.3 eff= 0.63 *10-4 BF = ( 5 .61 ± 1.42 ) * 10-3(stat. error) Mbc JOLANTA BRODZICKA B  D* D K July 09, 2003

  9. Dalitz plot for B± D*0 D0 K± forsignal-box events:abs(E)<45MeV Mbc>5.265GeV M2 ( D*0K± ) M2 ( D*0D0 ) M ( D*0K± ) Mbc sideband events N/10MeV M ( D0K± ) M ( D*0D0 ) JOLANTA BRODZICKA B  D* D K July 09, 2003

  10. B± D*± D0 K0s LR > 0.005 Plot for Mbc>5.27GeV Fit results for directly reconstr. signal (from 2-dim Mbc vs.E likelihood fit) N/7.5MeV XNSIG_1 28.555 ± 6.3408 XE0_1 0.36967E-04 ± 0.18999E-02 XEW_1 0.69559E-02 ± 0.18353E-02 XM0_1 5.2811 ± 0.70027E-03 XMW_1 0.24924E-02 ± 0.59248E-03 E Plot for abs(E)<25MeV N/2MeV S = 28.5 ± 6.3 Signif. = 7.9 Mbc JOLANTA BRODZICKA B  D* D K July 09, 2003

  11. Dalitz plot for B± D*± D0 K0s forsignal-box events:abs(E)<25MeV Mbc>5.27GeV M2 ( D*±K0s ) M2 ( D*±D0 ) M ( D*±K0s ) Mbc sideband events N/10MeV M ( D0K0s ) M ( D*±D0 ) JOLANTA BRODZICKA B  D* D K July 09, 2003

  12. 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_1 74.262 ± 14.830 XE0_1 -0.52998E-02 ± 0.39854E-02 XEW_1 0.20553E-01 ± 0.43100E-02 XM0_1 5.2802 ± 0.59736E-03 XMW_1 0.30466E-02 ± 0.59426E-03 Mbc E Mbc sideband events M ( D*0K± ) for signal-box events JOLANTA BRODZICKA B  D* D K July 09, 2003

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