Presentation is loading. Please wait.

Presentation is loading. Please wait.

J OLANTA B RODZICKA INP, K RAKOW DC March 03, 2004 Doubly charmed B decays B D (*) D (*) K ( for ~140 fb -1 ) D (*) K resonant structure.

Similar presentations


Presentation on theme: "J OLANTA B RODZICKA INP, K RAKOW DC March 03, 2004 Doubly charmed B decays B D (*) D (*) K ( for ~140 fb -1 ) D (*) K resonant structure."— Presentation transcript:

1 J OLANTA B RODZICKA INP, K RAKOW DC March 03, 2004 Doubly charmed B decays B D (*) D (*) K ( for ~140 fb -1 ) D (*) K resonant structure

2 D 0 K + D 0 K + resonant structure J OLANTA B RODZICKA BGM Nov 21, 2003 B D (*) D (*) K B + D 0 D 0 K + B 0 D - D 0 K + B + D* 0 D 0 K + SIGNAL with subtracted bckg fitted functions: BW +&Phase Space shape from 3body signal MC with free normalization (to describe non-resonant component) S / 50MeV M( D 0 K + ) PS corrected for (3770) D 0 D 0 contribution) M( D 0 K + ) - M( D 0 K + ) right-wrong flavor comb S / 50MeV N = 30.2 ± 5.7 M = ± GeV = ± GeV N = 80.2 ± 11.7 M = ± GeV = GeV fixed N = 15.1 ± 5.1 M = GeV fixed = GeV fixed N = 30.2 ± 8.4 M = ± GeV = ± GeV N = 8.1 ± 2.3 M = GeV fixed = GeV fixed D SJ (2573) ~2730 sth new!

3 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K N/50MeV M( D 0 K + ) B 0 D - D 0 K + LR>0.01 2dim E,M bc fit in D 0 K + mass bins to subtract background Fit only for E > - 75 MeV Good description of data also for high DK mass region fitted signal (plotted above bckg.) fitted background M( D 0 K + ) S + B / 50MeV signal box events B 0 D - D 0 K +

4 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K B 0 D - D 0 K + 2dim fit in D 0 K + mass bins for various LR cut SIGNAL with subtracted bckg S/50MeV LR > 0.005LR > 0.01 (shown before) LR > 0.04

5 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K Dalitz plot & projections for B 0 D - D 0 K + signal-box events LR > 0.04 M( D 0 D - ) M( D 0 K + ) Bckgr : Mbc sideband N / 25MeV

6 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K M( D 0 K + ) for B 0 D - D 0 K + Bckgr : E sideband below signal box Bckgr : Mbc sideband LR > 0.01 LR > 0.04 N / 25MeV

7 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K M( D 0 K + ) for B + D 0 D 0 K + LR > 0.04LR > 0.1 Bckgr : E sideband below signal box Bckgr : Mbc sideband N / 25MeV

8 Angular distribution J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K for 2.54 < M( D 0 K + ) < 2.6 GeV D SJ (2573) region B 0 D - D 0 K + cos helicity angle : angle between the K + direction in the D 0 K + rest frame and the D 0 K + direction in the rest frame of (4S) Signal events SIGNAL with subtracted bckg ( efficiency corrected) Background ( after MC eff. corr): ~ flat 2dim E,M bc fit in cos bins to filter out background cos 3body signal MC-> acceptance

9 Angular distribution J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K B + D 0 D 0 K + For 2.65 < M( D 0 K + ) < 2.80 GeV X(2730) region B 0 D - D 0 K + cos Signal events :helicity angle 3body signal MC cos SIGNAL with subtracted bckg ( efficiency corrected) Very asymmetric! Interference effect?

10 Inclusive analysis: D (*) KD (*) K D (*) K production from continuum e+e- D (*) K X J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K Selection criteria: accepted tracks with : abs ( IP _ dz )< 5cm abs ( IP _ dr )< 0.4cm K ± : P( K/ ) > 0.4 ± : P( /K ) > 0.1 el. veto : el_id < 0.95 K 0 S : abs ( M( + - ) - M Ks ) < 15MeV only good _K 0 s 0 : E > 50 MeV abs ( M ( ) - M 0 ) < 15MeV D ( * ) reconstruction D 0 K abs(M(D)-M(D PDG ) ) 0.) D * ± D 0 ± abs(M(D* ± )-M(D)- m PDG ) < 2.5MeV D * 0 D 0 0 abs(M(D* 0 )-M(D)- m PDG ) < 5.0MeV vertex fit (cl > 0.) applied p*(D ( * ) K) > 2.5 GeV in (4S) system ( for ~140 fb -1 on resonance)

11 D 0 K + D 0 K + mass spectrum of D 0 K + from e+e- D 0 K + X J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K p*(DK) > 2.5 GeV Very good place for precise measurement of D SJ (2573) D S1 (2536) properties p*(DK) > 4.0 GeV M(DK) - M(D) K ± : P( K/ ) > 0.6 ± : P( /K ) > 0.6 abs(M(D)-M(D PDG ) ) < 10MeV D SJ (2573) + D S1 (2536) D 0 ( 0 )K + cos hel > -0.7 (to remove bckg: slow K randomly associated with D) N/10MeV No supporting evidence for X(2730) from continuum, at this stage ? ~2650

12 J OLANTA B RODZICKA DC March 03, 2004 B D (*) D (*) K D* 0 K + D* + K 0 s D*K mass spectrum of D* 0 K +, D* + K 0 s from e+e- D*K X p*(D*K) > 3.5 GeV K ± : P( K/ ) > 0.6 ± : P( /K ) > 0.6 M(D*K) - M(D*) M(D*K) N/10MeV cos hel > -0.7 (smaller binning necessary ) D S1 (2536)


Download ppt "J OLANTA B RODZICKA INP, K RAKOW DC March 03, 2004 Doubly charmed B decays B D (*) D (*) K ( for ~140 fb -1 ) D (*) K resonant structure."

Similar presentations


Ads by Google