Resonances in B D 0 D 0 Kdecay

Resonances in B+ D 0 D 0 K+decay for 400 fb-1 J. Brodzicka, H. Palka INP Kraków DC Meeting February 6 th, 2006

q B + D 0 K+ LR>0. 01 For 400 fb-1 fitted signal amounts to: S = 399 ± 40 (For 250 fb-1 : S=234 ± 30) for Mbc>5. 273 Ge. V (3 ) for E <20 Me. V (3 ) Fitting method: 2 -dimensional unbinned likelihood fit on the Mbc vs. E plane J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Dalitz plot and projections for For Mbc > 5. 277 Ge. V E <10 Me. V 1. 5 signal region ) Ds. J(2700) ( B + D 0 K+ Background: elliptical strip 6 to 10 in Mbc, E, surrounding the signal region (3770) (4160) Ds. J(2700) (4160) (3770) Ds. J(2700) (4160) (3770) J. Brodzicka, H. Palka INP Krakow LR > 0. 01 Ds. J(2700) (4160) (3770) DC February 6 th, 2006

Acceptance losses over the Dalitz plot Efficiency map for B+ D 0 D 0 K+ D 0 Kπ, K 3π, Kππ0, Ksππ, KK [10 -3] Acceptance corrections for mass distributions: J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Mass distributions corrected for acceptance Events from 1. 5 E-Mbc signal region Background J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Dalitz plot projections for B + D 0 K+ with smaller 20 Me. V binning For 1. 5 E-Mbc signal region J. Brodzicka, H. Palka INP Krakow Background DC February 6 th, 2006 LR > 0. 01

Background-free invariant mass distributions 2 -dim Mbc- E fits in 2 -body inv. mass bins (3770) (4160) +Ds. J(2700) B signal in mass bins Ds. J(2700) + (4160) reflection Background-free mass spectra are very consistent with the Dalitz-plot projections over the estimated background. J. Brodzicka, H. Palka INP Krakow fitted B Signal DC February 6 th, 2006

Estimation of the resonance contributions (3770) Breit Wigner function + threshold function (4160) for (4160) in ½ helicity distr: 24 ± 11 events (for 2 nd half helicity distr: 20% smaller efficiency) 68 ± 15 3777 ± 3 27 ± 9 43 ± 20 4160 ± 0 80 ± 0 2708 ± 6 137 ± 32 218 ± 33 J. Brodzicka, H. Palka INP Krakow Ds. J(2700) for M(D 0 D 0)>3. 85 Ge. V (to remove (3770) reflection from high M(D 0 K+) region) Lower curve: MC predicted (4160) reflection + non-resonant component described by 3 -body MC Ds. J(2700) parameters consistent with previous estimations DC February 6 th, 2006

Explanation of 2 -body mass spectra Contributions from quasi-two-body components: (normalized to measured yields and superimposed by adding histograms) B+ (4160) K+ B+ (3770) K+ (Shapes predicted by MC simulations) B+ D 0 Ds. J+(2700) J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Angular distribution in the helicity frames of Ds. J(2700) and (3770) Background-free cos distribution obtained using 2 -dim Mbc - E fit in each cos bin Ds. J(2700) region: 2. 5<M(D 0 K+)<2. 9 Ge. V fitted B Signal (4160) reflection (3770) region: M(D 0 D 0)<3. 85 Ge. V J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Backups J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Mass distributions for backward and forward helicity hemispheres for J. Brodzicka, H. Palka INP Krakow for DC February 6 th, 2006

Inv. mass distributions corrected for acceptance with subtracted background (bin by bin subtraction) J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006

Explanation of 2 -body mass spectra with no ψ(4160) contribution NDs. J = 231 ± 32 MDs. J = 2706 ± 9 Me. V ΓDs. J = 136 ± 25 Me. V J. Brodzicka, H. Palka INP Krakow DC February 6 th, 2006 Ds. J(2700)

Dalitz plot and projections for For Mbc > 5. 277 Ge. V E <7. 5 Me. V 1. 5 signal region ) ( B + D 0 K+ LR > 0. 01 Background: elliptical strip 6 to 10 in Mbc, E, surrounding the signal region for 250 fb-1 J. Brodzicka, H. Palka INP Krakow BGM June 7, 2005

Background-free invariant mass distributions 2 -dim Mbc vs. E fits in 2 -body inv. mass bins B signal in mass bins for 250 fb-1 Ds. J(2700) + (4160) (3770) (4160) +Ds. J(2700) reflection M( D 0 K+ ) Signal / 50 Me. V reflection M( D 0 K+ ) M( D 0 D 0 ) fitted B Signal J. Brodzicka, H. Palka INP Krakow BGM June 7, 2005

Estimation of the resonance contributions (3770) Breit Wigner + threshold function fitted B Signal (4160) Ds. J(2700) for M(D 0 D 0)>3. 85 Ge. V for (4160) in ½ helicity distr: 34 ± 6 events Lower curve: MC predicted (4160) reflection + non-resonant component for 250 fb-1 Non-resonant component : NNR = 37 ± 13 J. Brodzicka, H. Palka INP Krakow BGM June 7, 2005