Resonances Resonances inin decay decay for 400fbfor 400fb-1-1
DC MeetingDC Meeting
April 10th, 2006April 10th, 2006
J.Brodzicka, H.Palka INP KrakJ.Brodzicka, H.Palka INP Krakóóww
BB++ D D00DD00KK++
Dalitz Dalitz plot plot projections projections forforwith 20MeV binningwith 20MeV binning
Background
B+ D0D0K+
For 1.5 E-Mbc signal region
LR > 0.01
J.Brodzicka, H.Palka INP Krakow DC February 6th, J.Brodzicka, H.Palka INP Krakow DC February 6th, 20062006
DsJ(2700) is not split upno significant narow states are seen besides (3770)
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
BB++ D D00DD00KK++ candidates with Dcandidates with D00(’s) from the mass sideband(’s) from the mass sideband
no LR cut no LR cut D mass sideband: D mass sideband: ||M(M(DD) - 1.865 GeV) - 1.865 GeV|| >15 MeV (~2 >15 MeV (~2σσ))
for Mbc > 5.273 GeV (3)
for E<20MeV (3)
both D’s from both D’s from mass sidebandmass sideband
at least one D from at least one D from mass sidebandmass sideband
no peaking backgroundno peaking background
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
for Mbc>5.277GeV (1.5)
for E<10MeV (1.5)
both D from both D from mass sidebandmass sideband
at least one D from at least one D from mass sidebandmass sideband
BB++ D D00DD00KK++ candidates with Dcandidates with D00(’s) from the mass sideband(’s) from the mass sideband
Two-body mass distributions for Two-body mass distributions for BB++ D D00DD00KK++ candidates candidates with Dwith D00(’s) from the mass sideband(’s) from the mass sideband
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
one D from one D from mass sidebandmass sideband
for Mbc > 5.273 GeV (3) and E<20MeV (3)
Mass spectra shapes consistent with Mass spectra shapes consistent with background estimated from background estimated from EE--MMbcbc sidebandsideband
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
both D from both D from mass sidebandmass sideband
for Mbc > 5.273 GeV (3) and E<20MeV (3)
Two-body mass distributions for Two-body mass distributions for BB++ D D00DD00KK++ candidates candidates with Dwith D00(’s) from the mass sideband(’s) from the mass sideband
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
for Mbc > 5.277 GeV (1.5) and E<10MeV (1.5) one D from one D from mass sidebandmass sideband
Two-body mass distributions for Two-body mass distributions for BB++ D D00DD00KK++ candidates candidates with Dwith D00(’s) from the mass sideband(’s) from the mass sideband
for Mbc > 5.277GeV and E<10 MeV ( 1.5 signal region )
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
Dalitz plot forDalitz plot for corrected for acceptance corrected for acceptance( with correction( with correction conserving number of events observed )conserving number of events observed )
B+ D0D0K+
DDsJsJ(2700)(2700)~2.5 GeV ~2.5 GeV
Dalitz plot forDalitz plot for corrected for acceptance corrected for acceptance( scaled to BF(( scaled to BF(BB++ D D00DD00KK++) by effective efficiency obtained) by effective efficiency obtained ))
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
for Mbc > 5.277GeV and E<10 MeV ( 1.5 signal region )
B+ D0D0K+
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
Mass distributions corrected for acceptanceMass distributions corrected for acceptance(using large ~700K (using large ~700K BB++ D D00DD00KK++ MC sample) MC sample)
Events from 1.5 E-Mbc signal region
Background from 6 < d <10 strip surrounding the E-Mbc signal region
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
BackgroundBackground-free-free invariant invariant mass mass distributionsdistributions corrected for acceptance corrected for acceptance
B signal in mass binsB signal in mass bins obtained from obtained from 22--dim Mdim Mbcbc--E fitE fitss in in two-body two-body inv. mass binsinv. mass bins
fitted fitted B B SignalSignalcorrected for acceptancecorrected for acceptance
Dalitz plots for various decay models forDalitz plots for various decay models for
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
BB++ D D00DD00KK++
MC studies based on the relative contributions from the resonant components and 3-body decay obtained from data analysis (non coherent approach)
no interference
max constructive interf.
DsJ(2700) and (4160)
max destructive interf.
DsJ(2700) and (4160)
Generated distributionsGenerated distributions
How interference between DsJ(2700) and (4160) (states crossing in the Dalitz plot) influences the DsJ parametres
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
non-coherent approach
no interference
max constructive interf. = 0
between DsJ(2700) and (4160)
max destructive interf. = 180
between DsJ(2700) and (4160)
Comparison of mass spectra in various decay models Comparison of mass spectra in various decay models for for BB++ D D00DD00KK++
Generated distributionsGenerated distributions
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
Dalitz plots for various decay models forDalitz plots for various decay models forBB++ D D00DD00KK++
Reconstructed distributionsReconstructed distributions
no interference
max constructive interf.
DsJ(2700) and (4160)
max destructive interf.
DsJ(2700) and (4160)
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
non-coherent approach
no interference
max constructive interf.
between DsJ(2700) and (4160)
max destructive interf.
between DsJ(2700) and (4160)
Comparison of mass spectra in various decay models Comparison of mass spectra in various decay models for for BB++ D D00DD00KK++
Reconstructed distributionsReconstructed distributions
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
non-coherent approach
no interference
max constructive interf.
between DsJ(2700) and (4160)
max destructive interf.
between DsJ(2700) and (4160)
Comparison of mass spectra in various decay models Comparison of mass spectra in various decay models with data distributionswith data distributions
datadata
interference effects do not influence interference effects do not influence the 2-body mass distributions substantiallythe 2-body mass distributions substantially decay model is not decideddecay model is not decided
Interference related systematics on DInterference related systematics on DsJsJ parameters parameters
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
(to remove (3770) reflection
from high M(D0K+) region)
for M(D0D0)>3.85 GeV
BW + MC predicted (4160) reflection + non-resonant component described by 3-body MC
no interference
max constructive interf.
max destructive interf.
Uncertainty on:Uncertainty on:Yield: +4 %Yield: +4 %M: +3 -8 MeV M: +3 -8 MeV ΓΓ: +36 -30 MeV : +36 -30 MeV
Fits like in data analysis:Fits like in data analysis:
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
11-- stronglystrongly favouredfavoured
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
Angular distribution Angular distribution in the DsJ(2700) helicity frame in the DsJ(2700) helicity frame
fitted fitted B B SignalSignalcorrected for acceptancecorrected for acceptance
DsJ(2700) region: 2.57 < M(D0K+) < 2.84 GeV
BackupsBackups
J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006J.Brodzicka, H.Palka INP Krakow DC April 10th, 2006
Dalitz plot and projections forDalitz plot and projections for Background: elliptical strip 6 to 10
in Mbc, E, surrounding the signal region
B+ D0D0K+
For Mbc > 5.277GeV E<10 MeV
( 1.5 signal region )
LR > 0.01
J.Brodzicka, H.Palka INP Krakow DC February 6th, J.Brodzicka, H.Palka INP Krakow DC February 6th, 20062006
(4160(4160))
(3770)(3770)
DDsJsJ(2700)(2700)
(3770)(3770) (4160)(4160)
DDsJsJ(2700)(2700)
DDsJsJ(2700) (2700) (3770)(3770)
(4160(4160))
(3770)(3770)(4160(4160))
DDsJsJ(2700)(2700)
J.Brodzicka, H.Palka INP Krakow DC February 6th, J.Brodzicka, H.Palka INP Krakow DC February 6th, 20062006
BackgroundBackground-free-free invariant invariant mass mass distributionsdistributions22--dim Mdim Mbcbc--E fitE fitss in in 2-body 2-body inv. mass binsinv. mass bins B signal in mass binsB signal in mass bins
DsJ(2700) +(4160) reflection
(4160) +DsJ(2700) reflection
(3770)
Background-free mass spectra are very consistent with the Dalitz-plot projections over the estimated background.
fitted B Signal
Estimation of the resonance contributionsEstimation of the resonance contributions
(4160)
(3770) DsJ(2700)
(to remove (3770) reflection
from high M(D0K+) region)
for M(D0D0)>3.85 GeV
Lower curve: MC predicted (4160) reflection + non-resonant component described by 3-body MC
.0cos DDfor (4160) in ½ helicity distr: 24 ± 11 events (~2σ)(for 2nd half helicity distr: 20% smaller efficiency)
Breit Wigner functions+ threshold function
DsJ(2700) parametersconsistent with previousestimations
Z(3930)
J.Brodzicka, H.Palka INP BAM February 27th, 2006J.Brodzicka, H.Palka INP BAM February 27th, 2006
Non-resonant component yieldNon-resonant component yield: 47 ± 32: 47 ± 32
Contributions from quasi-two-body components:(normalized to measured yields and superimposed by adding histograms)
B+ (4160) K+B+ (3770) K+ B+ D0 DsJ+(2700)
Explanation ofExplanation of 2-body mass spectra2-body mass spectra
Shapes predicted by MC simulations
DDsJsJ++((2702700)0), , ((3773770)0) are not the full story, but the ‘fit’ is acceptable are not the full story, but the ‘fit’ is acceptable
J.Brodzicka, H.Palka INP BAM February 27th, 2006J.Brodzicka, H.Palka INP BAM February 27th, 2006