D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006
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D sJ (2700) in decay J.Brodzicka, H.Palka INP Krak ó w DC June 12 , 2006 PowerPoint PPT Presentation


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D sJ (2700) in decay J.Brodzicka, H.Palka INP Krak ó w DC June 12 , 2006. B +  D 0 D 0 K +. How to describe M(D0K+) distribution?. M(D 0 K + ) for M(D 0 D 0 )>3 . 85 GeV to remove  (3770) r eflection from high M( D 0 K + ) region. previous fit:.

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D sJ (2700) in decay J.Brodzicka, H.Palka INP Krak ó w DC June 12 , 2006

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D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

DsJ(2700) in decay

J.Brodzicka, H.Palka INP Kraków

DC June12, 2006

B+ D0D0K+


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

How to describe M(D0K+) distribution?

M(D0K+)for M(D0D0)>3.85GeVto remove (3770)reflection from high M(D0K+) region

previous fit:

now: + scalar exponential component

BW + MC predicted (4160)reflection

+ non-resonantcomponent described by 3-body MC

3-body PS: 47 ± 32

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

M(D0K+) corrected for acceptance

Fit:

BW + MC predicted (4160)reflection

+ exp[-A * M(D0K+) ]

+ non-resonantcomponent described by 3-body MC

Physics interpretation of this exponential component?

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

B+ (4160)K+

B+ (3770)K+

B+ D0DsJ+(2700)

exp. component

Explanation ofeff. corrected2-body mass spectra

Contribution from each component:

normalized to measured yield and superimposed by adding histograms

– non coherent approach

Shapes predicted by MC simulations

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

B+ (4160)K+

B+ (3770)K+

B+ D0DsJ+(2700)

exp. component

Explanation of2-body mass spectra

Shapes predicted by MC simulations

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

B+ D0D0K+

Dalitz plots for various decay models for

How interference between DsJ(2700)and scalar exp. component influences the DsJ parametres?

MC studies based on the relative intensitiesof contributing components obtained from data analysis (non coherent approach)

no interference

max constructive interf.

max destructive interf.

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

non-coherent approach

no interference

max constructive interf.

between DsJ(2700)and exp

max destructive interf.

between DsJ(2700)exp

Decay model predictions vs. observed mass spectra

  • interference effects do not influence

    DsJ parameters strongly

  • decay model is not decided (included in systematics)

  • look at angular distributions is needed

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

for uncorrected distributions

no interference

max constructive interf.

max destructive interf.

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

Backups

J.Brodzicka, H.Palka INP DCJune12, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

Comparison with the DsJ(2700)spin hypotheses:

J=1 2/n.d.f = 3.4/4

J=2 2/n.d.f = 16.2/4

J=0 2/n.d.f = 36.5/4

fitted B Signal

corrected for acceptance

1-favoured

Angular distribution

in the helicity frame of DsJ(2700)

Background-free cos distribution obtained using

2-dim Mbc-E fit in eachcos bin

DsJ(2700) →D0K+ : 1→0-0-P-wave decay

thusDsJ(2700) P parity : -

J.Brodzicka, H.Palka INP BAM February 27th, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

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


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

B+ (4160)K+

B+ (3770)K+

B+ D0DsJ+(2700)

Background-free mass distr. corrected for acceptance

(3770)

DsJ(2700)

Z(3930)

  • M(D0D0) strongly affected by acceptance losses

  • influence of these losses on DsJ(2700) regionis minor

J.Brodzicka, H.Palka INP BAM February 27th, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

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 BAM February 27th, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

Events from 1.5E-Mbc signal region

Background

Mass distributions corrected for acceptance

J.Brodzicka, H.Palka INP BAM February 27th, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

Dalitz plot projections for

with smaller 20MeV binning

B+ D0D0K+

LR > 0.01

For 1.5E-Mbc signal region

Background

for 400fb-1

 no significant narow states

J.Brodzicka, H.Palka INP BAM February 27th, 2006


D sj 2700 in decay j brodzicka h palka inp krak w dc june 12 2006

Summary

  • 400 fb-1 sample has been analysed;

    all features seen in the 250 fb-1 sample are confirmed

    • strong DsJ(2700)→D0K+resonance(significance = 6.7σ)

      M= 2709 ± 10 MeV Γ= 137 ± 27 MeV JP=1- favoured

    • Ψ(3770) confirmed

      M= 3777 ± 3 MeV Γ= 27 ± 9 MeV

    • remaining structures in M(D0D0) could not be resolved,

      but their influence on the DsJ(2700) parameters is small

      (included into systematic errors)

  • We would like to publish DsJ(2700) as it is now,

    deeper insight into M(D0D0) and M(D0K+) dynamics

    will be possible after full Dalitz plot analysis (if it is successful)

J.Brodzicka, H.Palka INP BAM February 27th, 2006


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