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Resonances in decay for 400fb -1 DC Meeting April 10th, 2006

B +  D 0 D 0 K +. Resonances in decay for 400fb -1 DC Meeting April 10th, 2006. J.Brodzicka, H.Palka INP Krak ó w. Dalitz plot projections for with 20MeV binning. B +  D 0 D 0 K +. LR > 0.0 1. For 1.5  E - Mbc signal region. Background.

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Resonances in decay for 400fb -1 DC Meeting April 10th, 2006

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  1. B+ D0D0K+ Resonances in decay for 400fb-1 DC Meeting April 10th, 2006 J.Brodzicka, H.Palka INP Kraków

  2. Dalitz plot projections for with 20MeV binning B+ D0D0K+ LR > 0.01 For 1.5E-Mbc signal region Background • DsJ(2700) is not split up • no significant narow states are seen besides (3770) J.Brodzicka, H.Palka INP Krakow DC February 6th, 2006

  3. B+ D0D0K+candidates with D0(’s) from the mass sideband D mass sideband: |M(D) - 1.865 GeV| >15 MeV (~2σ) no LR cut both D’s from mass sideband at least one D from mass sideband for Mbc>5.273 GeV (3) for E<20MeV (3) no peaking background J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  4. B+ D0D0K+candidates with D0(’s) from the mass sideband at least one D from mass sideband both D from mass sideband for Mbc>5.277GeV (1.5) for E<10MeV (1.5) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  5. Two-body mass distributions for B+ D0D0K+candidates with D0(’s) from the mass sideband one D from mass sideband for Mbc>5.273 GeV (3) and E<20MeV (3) Mass spectra shapes consistent with background estimated from E-Mbcsideband J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  6. Two-body mass distributions for B+ D0D0K+candidates with D0(’s) from the mass sideband both D from mass sideband for Mbc>5.273 GeV (3) and E<20MeV (3) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  7. Two-body mass distributions for B+ D0D0K+candidates with D0(’s) from the mass sideband one D from mass sideband for Mbc>5.277 GeV (1.5) and E<10MeV (1.5) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  8. Dalitz plot for corrected for acceptance ( with correctionconserving number of events observed ) B+ D0D0K+ for Mbc > 5.277GeV and E<10 MeV( 1.5 signal region ) ~2.5 GeV DsJ(2700) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  9. Dalitz plot for corrected for acceptance ( scaled to BF(B+ D0D0K+) by effective efficiency obtained) B+ D0D0K+ for Mbc > 5.277GeV and E<10 MeV( 1.5 signal region ) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  10. Events from 1.5E-Mbc signal region Background from 6 < d <10 strip surrounding the E-Mbc signal region Mass distributions corrected for acceptance (using large ~700K B+ D0D0K+ MC sample) J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  11. fitted B Signal corrected for acceptance Background-freeinvariant mass distributions corrected for acceptance B signal in mass bins obtained from 2-dim Mbc-E fits in two-body inv. mass bins J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  12. How interference between DsJ(2700)and (4160) (states crossing in the Dalitz plot) influences the DsJ parametres B+ D0D0K+ max constructive interf. DsJ(2700)and (4160) max destructive interf. DsJ(2700)and (4160) no interference Dalitz plots for various decay models for MC studies based on the relative contributions from the resonant components and 3-body decay obtained from data analysis (non coherent approach) Generated distributions J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  13. non-coherent approach no interference max constructive interf. = 0 between DsJ(2700)and (4160) B+ D0D0K+ max destructive interf. = 180 between DsJ(2700)and (4160) Comparison of mass spectra in various decay models for Generated distributions J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  14. B+ D0D0K+ max constructive interf. DsJ(2700)and (4160) max destructive interf. DsJ(2700)and (4160) no interference Dalitz plots for various decay models for Reconstructed distributions J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  15. non-coherent approach no interference max constructive interf. between DsJ(2700)and (4160) B+ D0D0K+ max destructive interf. between DsJ(2700)and (4160) Comparison of mass spectra in various decay models for Reconstructed distributions J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  16. non-coherent approach no interference max constructive interf. between DsJ(2700)and (4160) max destructive interf. between DsJ(2700)and (4160) data Comparison of mass spectra in various decay models with data distributions • interference effects do not influence the 2-body mass distributions substantially • decay model is not decided J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  17. for M(D0D0)>3.85 GeV no interference (to remove (3770)reflection from high M(D0K+) region) max constructive interf. BW + MC predicted (4160)reflection + non-resonant component described by 3-body MC max destructive interf. Interference related systematics on DsJ parameters Fits like in data analysis: Uncertainty on: Yield: +4 % M: +3 -8 MeV Γ: +36 -30 MeV J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  18. Comparison with the DsJ(2700)spin hypotheses: J=1 2/n.d.f = 6.7/5 ~cos2θ J=2 2/n.d.f = 249.9/5 ~(1-3cos2θ)2 J=0 2/n.d.f = 184.7/4 flat fitted B Signal corrected for acceptance 1-stronglyfavoured Angular distribution in the DsJ(2700) helicity frame DsJ(2700) region:2.57 <M(D0K+)<2.84 GeV J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  19. Backups J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006

  20. DsJ(2700) (3770) (4160) DsJ(2700) (4160) (3770) DsJ(2700) (4160) (4160) (3770) DsJ(2700) (3770) Dalitz plot and projections for B+ D0D0K+ LR > 0.01 For Mbc > 5.277GeV E<10 MeV( 1.5 signal region ) Background:elliptical strip 6 to 10 in Mbc, E, surrounding the signal region J.Brodzicka, H.Palka INP Krakow DC February 6th, 2006

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

  22. for for M(D0D0)>3.85 GeV (4160) in½helicity distr: 24 ± 11events (~2σ) (to remove (3770)reflection from high M(D0K+) region) (for 2nd half helicity distr: 20% smaller efficiency) Lower curve: MC predicted (4160)reflection + non-resonant component described by 3-body MC Estimation of the resonance contributions DsJ(2700) (3770) (4160) Z(3930) Breit Wigner functions + threshold function DsJ(2700) parameters consistent with previous estimations Non-resonant component yield: 47 ± 32 J.Brodzicka, H.Palka INP BAM February 27th, 2006

  23. B+ (4160)K+ B+ (3770)K+ B+ D0DsJ+(2700) DsJ+(2700), (3770) are not the full story, but the ‘fit’ is acceptable Explanation of2-body mass spectra Contributions from quasi-two-body components: (normalized to measured yields and superimposed by adding histograms) Shapes predicted by MC simulations J.Brodzicka, H.Palka INP BAM February 27th, 2006

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