New Resonance in D 0 K + Andrzej Bozek for Jolanta Brodzicka & Henryk Palka INP Krakow INP KrakowBAM...

New Resonance in DNew Resonance in D00KK++

Andrzej BoAndrzej Bozzek ek for for Jolanta Brodzicka Jolanta Brodzicka & & Henryk Palka Henryk Palka INP KrakowINP Krakow

BAMBAMJuly 15, July 15, 20042004Outline :Outline :

PPhysics motivationshysics motivations

AAnalysis methodnalysis method

BB++ D D00DD00KK++ BB00 D D--DD00KK++ signalssignals for for 190fb190fb-1-1

Dalitz plots and projectionsDalitz plots and projections

BBackground subtracted M(Dackground subtracted M(D00KK++) distributions ) distributions

DDsJsJ(2573) & D(2573) & DsJsJ(2720) (2720)

AAngular distrbutions ngular distrbutions

SSupporting evidence from continuum upporting evidence from continuum

CConlusionsonlusions

for for 190fb190fb-1 -1

(exp7-35)(exp7-35)

JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow BAM July 15, 2004INP Krakow BAM July 15, 2004

Physics motivations Physics motivations

sc

Inconsistent with model predictionsInconsistent with model predictionsDo not decay to DK, D*KDo not decay to DK, D*KIs it a good assignement?Is it a good assignement?

Chiral Chiral doubletdoublet for for Ds Ds 00-- and Ds*and Ds* 11-- ? ?

Well knownWell known

Scarcely knownScarcely knownnot seen in B decaysnot seen in B decaysChiral partners expectedChiral partners expected

L = 1 L = 1 Parity+Parity+ jjqq= = 33//22 J =J = 22

J = 1J = 1

jjqq= = ½½ J = 1J = 1

J = 0J = 0 L = 0L = 0 Parity -Parity -

jjqq= = ½½ JJ = 1= 1

JJ = 0= 0

Ds* Ds* (2112) (2112)

Ds Ds (1968)(1968)

DDSJSJ (2573) (2573)

DDS1 S1 (2536)(2536)

DDSJSJ (2(2457457))

DDSSJ J (2(2317317))

L = 2 …?L = 2 …?

n = 2 …n = 2 …

n = 1n = 1

J J :: total spin of mesontotal spin of mesonL L :: orbital momentum of light quarkorbital momentum of light quark

jjqq : : light quark angular light quark angular mommom..

cscs multipletsmultiplets : uncomplete/umbiguous ( ? ): uncomplete/umbiguous ( ? ) assignment assignment recent inrecent intrigutriguing discoveries:ing discoveries: DDSJSJ (231(23177), ), DDSSJ J (245(24577)) , , SELEX state (?)SELEX state (?)


B B D D((**))DD((**))KK : good place to explore spectroscopy: : good place to explore spectroscopy:

b b cW cW -- c c s c c s ++ dd (uu) dd (uu) DD((**)) K from W vertexK from W vertex

BB0 0 D D--DD00KK++

Physics motivations (2)Physics motivations (2)

Leading quark diagrams:Leading quark diagrams:

only External diagramonly External diagram DD00KK++ is theis the only only non-exotic comb., non-exotic comb., DD--DD0 0 have > 2q contenthave > 2q content

BB++ D D00DD00KK++

External + Internal diagrams External + Internal diagrams Both DK and DDBoth DK and DD states expected states expected DD00KK++ is exotic is exotic

_


selection cutsselection cuts accepted events : R2< 0.3

tracks : IP_dz< 5cm IP_dr< 0.4cm

K± : P(K/) > 0.4 ± : P(/K) > 0.1 electron veto: el_id < 0.95

K0S : M(+ -) - MKs <15MeV only good K0

s accepted

0 : E >50 MeV M( ) -M0 <15MeV

D D reconstructionreconstruction D0 K, K3, K0, Ks, KK BF ~ 28% of total

D± K, Ks, KK, KsK BF ~ 12% of total

M(D)-M(DPDG) < 20MeV ( D0 K0 : -50MeV )

vertex fit (cl > 0.) and mass constraint fit applied p(D) < 2 GeV in (4S) system

BB DDKDDK reconstruction reconstruction B vertex fit: with IP and B constraints

Mbc > 5.2 GeV -0.40 < E < 0.35 GeV

AnalysisAnalysis method method


Multi-candidates events treatmentMulti-candidates events treatment

D probabilities (D probabilities ( LRLR_D _D ):):

LR_D ( MLR_D ( MD D ))= B(MB(MDD))

S(MS(MDD))

S(MS(MDD))++

S(MD), B(MD) parameterization from

fits

to data ( inclusively reconstructed

D0, D± in each decay mode separately )

D plots for ~11fb-1 after preselection

p(D) < 2GeV in (4S) system

B probability ( LR_B )B probability ( LR_B )::

LR_B = LR_DLR_B = LR_D11 ×× LR_D LR_D22

LR_BLR_B used also for used also for backgroundbackground discriminationdiscrimination

equal LR_B case: larger K±_ID candidate chosen

best B candidate : with max LR_Bmax LR_B

MMDD

DD00 K K

MMDD

DD00 K3K3

MMDD

DD±± KKss

MMDD

DD±± KK MMDD

DD00 KK00

LR_DLR_D

LR_DLR_D

LR_DLR_D

LR_DLR_D LR_DLR_D


E

N/7

.5M

eV plot for Mbc >5.27 GeV

N/2

.5M

eV

Mbc

plot for E<25MeV

Fitting method:Fitting method: 2-2-dimdim M Mbc bc vs.vs. E unbinned E unbinned likelihoodlikelihood fit fit::

L_Sig(L_Sig(MMbc, bc, E)E) = = SS••( ( G (G (MMbcbc) ) •• G ( G (E) E) ) )

+ + SS••( G (( G (MMbcbc) ) •• G ( G (E) E) ))

+ + SS22••( G (( G (MMbcbc) ) •• G ( G (E) E) ))22

L_Bckg (L_Bckg (MMbc, bc, E)E) = B = B••ARG (ARG (MMbcbc) ) •• POL_2 ( POL_2 (EE)) L= L_Sig + L_Bckg L= L_Sig + L_Bckg

LR > 0.04LR > 0.04BB++ D D00DD00KK++

S = 116.8 S = 116.8 ±± 14.814.8

GG00((E) = E) = --00.32.32E-0E-022 ±± 0. 0.0808E-02E-02

((E) = 0.E) = 0.5252E-0E-022 ±± 0. 0.0707E-0E-02 2

GG00(Mbc) = 5.28(Mbc) = 5.281616 ±± 0.000 0.00044

(Mbc) = 0.(Mbc) = 0.2424E-02 E-02 ±± 0. 0.0303E-0E-022

SS , , SS22 : regions: regions with missing with missing ,2,2

Fit result:Fit result:


BB00 D D--DD00KK++ LR > 0.01LR > 0.01

S = S = 161.0161.0 ±± 16.616.6

GG00((E) = E) = - -00.19.19E-0E-022 ±± 0. 0.0808E-02E-02

((E) = 0.E) = 0.5757E-0E-022 ±± 0. 0.0606E-0E-022

GG00(Mbc) = 5.28(Mbc) = 5.281010 ±± 0.000 0.00033

(Mbc) = 0.(Mbc) = 0.2626E-02 E-02 ±± 0. 0.0303E-0E-022

E

N/7

.5M

eV plot for Mbc >5.27 GeV

N/2

.5M

eV

Mbc

plot for E<25MeV

Fit result (Fit result (for fully reconstructed region):for fully reconstructed region):


ModeModeSignalSignal

for 140fbfor 140fb-1-1eff eff [ 10[ 10-4 -4 ]] BF [ 10BF [ 10--3 3 ]]

SignalSignal

for 190fbfor 190fb-1-1

BB++ D D00DD00KK++ 94.4 ± 13.094.4 ± 13.0 4.80 ± 0.144.80 ± 0.14 1.30 ± 0.18 ± 1.30 ± 0.18 ± 0.210.21

116.8 116.8 ±± 14.814.8

BB0 0 D D--DD00KK++ 127.6 ± 127.6 ± 15.315.3 6.98 ± 0.146.98 ± 0.14 1.68 ± 0.20 ± 1.68 ± 0.20 ±

0.250.25161.0161.0 ±± 16.616.6

BF calculations based on 140fbBF calculations based on 140fb-1-1

M2( D0K+ )DDsJsJ(2720) (2720)

(4160)(4160)

(3770)(3770)

DDsJsJ(2573)(2573)


Dalitz plot and projections for Dalitz plot and projections for Background:Background: ellipellipsoidal strip soidal strip 66 to to 1010

in in MbcMbc, , EE, surrounding the signal region, surrounding the signal region

BB++ D D00DD00KK++

M( D0 K+ )

N /

20

MeV

N /

20

MeV

M( D0D0 )

M( D0K+ )

M2(

D0D

0 )

for signal-box events :for signal-box events : Mbc > 5.273 GeV Mbc > 5.273 GeV EE<16 MeV (~3<16 MeV (~3 ) )

LR > 0.04LR > 0.04

(3770)(3770) (4160)(4160)

(4040)(4040)

DDsJsJ(2573)(2573)

DDsJsJ(2720) ? (2720) ?

(3770)(3770) reflectionreflection

(4160) reflection possible (4160) reflection possible

N /

20

MeV

?

DDsJsJ(2720) (2720) DDsJsJ(2573)(2573)


Dalitz plot and projectionsDalitz plot and projections BB00 D D--DD00KK++ M

2(

D0D

- )

M2( D0K+ )

M( D0K+ ) M( D-K+ )

M( D-D0 )

N /

20

MeV

for signal-box events :for signal-box events : Mbc > 5.273 GeV E<18 MeV (~3 )

N /

20

MeV

N /

20

MeV

LR > 0.01LR > 0.01

DDsJsJ(2720) ? (2720) ?

DDsJsJ(2573)(2573)

BackgroundBackground


M(DM(D00KK++) ) background subtracted distributionsbackground subtracted distributions2dim 2dim MMbc bc vs.vs. E E fit fitss in in M( D M( D00KK+ + ) bins) bins B signal in M( D0K+ ) bins

fitted Signal with error M( D0K+ )

Sig

nal /

50M

eV

Sig

nal /

50M

eV

BB00 D D--DD00KK++

BB++ D D00DD00KK++ •peak at 2.720 GeV seen, no DDsJsJ(2573) (2573)

• DDsJsJ(2573) (2573)

and DDsJsJ(2720) (2720)

observedobserved

M(D0 D0)

(4160)(4160)

Sig

nal /

50

MeV

M(D0D0)>3845

(4160)(4160) contribution tiny (if any)

• (3770) (3770) region removed

• is the (4160) (4160) contributing tocontributing to 2720 2720 peak peak?

• M(D0D0) for high D0K+ masses ( ≡ ½ of the (4160)(4160) helicity distr.)


• rresonances described by non-relativistic Breit-Wigneresonances described by non-relativistic Breit-Wignerss• DDsJsJ(2573)(2573) peak narrower than the bin widthpeak narrower than the bin width, , (-> fit unreasonable numerically,(-> fit unreasonable numerically, sesee e previous previous

attempts)attempts) → → the convolutionthe convolution BW BW G( G(=50MeV)=50MeV) is used is used• Phase Space Phase Space (nonresonant component) is described by (nonresonant component) is described by linear functionlinear function

Fits to background subtracted Fits to background subtracted D0K+ mass spectramass spectraS

ign

al /

50M

eV

Sig

nal /

50M

eV

fitted B Signal

M( D0K+ ) M( D0K+ )

N = N = 39.539.5 ± 7.6 ± 7.6MM = 2742 ± 6 MeV = 2742 ± 6 MeV

= 80= 80 ± 27 MeV ± 27 MeV

N = N = 80.380.3 ± 14.0 ± 14.0MM = 2718 ± 8 MeV = 2718 ± 8 MeV

= 79= 79 ± 18 MeV ± 18 MeV

N = N = 13.313.3 ± 4.2 ± 4.2 MM = 2569 ± 8 MeV = 2569 ± 8 MeV

= 15 MeV fixed= 15 MeV fixed

DDsJsJ(2720) (2720) DDsJsJ(2720) (2720) DDsJsJ(2573) (2573)

BB++ D D00DD00KK++ BB00 D D--DD00KK++


Angular distribution Angular distribution

Helicity angle Helicity angle : : angle between angle between KK++ momentum inmomentum in D D00KK++ rest frame rest frame

and and DD00KK++ momentum (boost direction) momentum (boost direction)

DD0K+

D0

K+

B

coscos distribution obtained using distribution obtained using

2-dim 2-dim MMbc bc vs.vs. E E fit in fit in each coseach cos bin bin (to subtract background)(to subtract background)

fitted fitted B B Signal with error Signal with error corrected for acceptancecorrected for acceptance

DDSJSJ (2573) region:(2573) region: B B0 0 D D--DD00KK+ + signal-box and 2.54 < M(Dsignal-box and 2.54 < M(D00KK++) < ) < 2.6 GeV 2.6 GeV

((30 MeV window )30 MeV window )

Sig

nal

Sig

nal

coscos

Compatible withCompatible with J=2 J=2

coscos

Acceptance for signal MCAcceptance for signal MC

DD--DD00K+K+ (K)(K): :

JJolanta olanta BrodzickaBrodzicka, Henryk Pałka, Henryk Pałka INP Kraków BAM July 15, 2004INP Kraków BAM July 15, 2004

Angular distribution (2) Angular distribution (2)

DDsJsJ (2720) region:(2720) region: B B DD DD00KK+ + signal-box and 2.64 < M(Dsignal-box and 2.64 < M(D00KK++) < 2.8 GeV () < 2.8 GeV (80MeV 80MeV

window )window )

BB0 0 D D--DD00KK++

BB++ D D00DD00KK+ +

coscos

fitted fitted B B Signal with error Signal with error corrected for acceptancecorrected for acceptance

Sig

nal

Sig

nal

Sig

nal

Sig

nal

coscos

coscos

coscos

Acceptance for signal MCAcceptance for signal MC

DD--DD00K+K+ (K)(K): :

Acceptance for signal MCAcceptance for signal MC DD00DD00K+K+ (K)(K): :

Very asymmetric Very asymmetric -interference ef-interference efffect ?ect ?-interference with what?-interference with what? (no significant str(no significant struucturesctures are seen in other Dalitz are seen in other Dalitz plot projections )plot projections )


DDsJsJ(2573)(2573)

DDsJsJ(2720)(2720)

M( D0K+ )

N/2

0M

eV

DD00KK+ + from continuumfrom continuum

D0 K DK vertex fit with IP constraint (to reduce background) cl>.9 P*(DK) > 3.5 GeV in (4S) system

M(D)-M(DPDG) < 20MeV

for 140 fb-1

background parameterizationbackground parameterization needed to do meaningfull fit needed to do meaningfull fit M( DM( D00KK++ ) ) (e.g. wrong flavor D0K- combination) analysis for analysis for continuumcontinuum MC MC will will be done be done

>150 events (by counting)


Conclusions Conclusions The The new resonant new resonant structure instructure in DD00KK++ is observed in B decays:is observed in B decays:

BB++ D D00DD00KK++ ( ( 5.25.2 σσ ) ) and and BB00 D D--DD00KK++ ( ( 5.5.7 7 σσ))MM = 2742 ± 6 MeV = 2742 ± 6 MeV

= 80= 80 ± 27 MeV ± 27 MeV

MM = 2718 ± 8 MeV = 2718 ± 8 MeV

= 79= 79 ± 18 MeV ± 18 MeV

It It is is not reflection from not reflection from anyany other stuctures in the other stuctures in the Dalitz plotDalitz plot

Its helicity distribution is puzzlingIts helicity distribution is puzzling in in (rather (rather asymmetricasymmetric))

Supporting evidence from cSupporting evidence from continuum produced ontinuum produced DD00KK++ spectrumspectrum, ,

Evidence forEvidence for DDsJsJ(2573) (2573) DD00KK++ in in BB00 D D--DD00KK++ ( 3 ( 3.2.2 σσ ))

BB00 D D--DD00KK++

(rather surprising)(rather surprising)

Draft of the conf. paper and the B_Note are on the wayDraft of the conf. paper and the B_Note are on the way

Exp. 37 data set will be added Exp. 37 data set will be added

DD00KK++ from other doubly charmed B decays are studied:from other doubly charmed B decays are studied: BB00 D D*-*-DD00KK++

BB++ D D*0*0DD00KK++

butbut inconclusive at 140fb-1 inconclusive at 140fb-1

DD**KK from spectrum is also studied in doubly charmed B decays from spectrum is also studied in doubly charmed B decays and produced from continuum and produced from continuum


Backup slidesBackup slides


MMbc bc && E “movie”E “movie”

from from 2dim M2dim Mbc bc vs.vs. EE fit fit inin M( D M( D00KK+ + )) 50MeV bins for 50MeV bins for BB00 D D--

DD00KK++

EMbcEMbc

M( DM( D00KK+ + )) bin bin

2.35 - 2.40

2.40 - 2.45

2.45 - 2.50

2.50 - 2.55

2.55 - 2.60

2.60 - 2.65


MMbc bc && E “movie” ( 2 )E “movie” ( 2 )

2.65 - 2.70

M( DM( D00KK+ + ) ) binbin

2.70 - 2.75

2.75 - 2.80

EMbcEMbc

2.80 - 2.85

2.85 - 2.90

2.95 – 3.0

BB00 D D--DD00KK++


D*KD*K from continuumfrom continuum

M(D*K )

N/2

0M

eV

D0 K D*K vertex fit with IP constraint (to reduce background) cl>.1 P*(DK) > 3.5 GeV in (4S) system

for 140 fb-1 D*+ K0s, D*0K+

M(D)-M(DPDG) < 20MeV

DDs1s1(2536)(2536)

It seems to be quite rich


Fit variantsFit variants S

ign

al /

50M

eV

M( D0K+ ) M( D0K+ )

M( D0K+ )

Sig

nal /

50M

eV

•NNonresonant component onresonant component is described byis described by 3-body MC 3-body MC distributiondistribution

• Mass fixed to 2720MeVMass fixed to 2720MeV 2 similar2 similar


Background subtracted mass distributionsBackground subtracted mass distributions

BB++ D D00DD00KK++

M( D0D0 ) M( D0K+ )

wrong flavour comb.wrong flavour comb.

Sig

nal /

50M

eV

Sig

nal /

25M

eV

JOLANTA BRODZICKA BGM Nov 21, 2003B D(*) D(*) K

Supporting evidence in D*KSupporting evidence in D*K ?

B+ D0D*0K+

B0 D*-D*0K+

B D(*)D*0K+

S /

50

MeV

S /

50

MeV

M( D*0K+ )

Partially reconstructed:

B D0D*0K+ + lostS /

25

MeV

N = 50.7 ± 15.3

M = 2.743 ± 0.009 GeV

= 0.050 ± 0.026 GeVM( D*0K+ )

Fitted:G+BW+BW+&PS

N = 3.8 ± 1.6

M = 2.536 GeV fixed

= 0.005 GeV fixed (exp.resol)

DS1(2536) ?

N = 27.7 ± 8.0

M = 2.613 ± 0.008 GeV

= 0.039 ± 0.014 GeV

B+ D0D*+K0s

Partially reconstructed:

B+ D0D*+K0s + lost

B D(*)D*+K0s

M(D*+K0s)

S /

50

MeV

S /

50

MeV

SIGNAL with subtracted bckg

PS for 3body MC


Backup slidesBackup slides

New Resonance in D 0 K + Andrzej Bozek for Jolanta Brodzicka & Henryk Palka INP Krakow INP KrakowBAM...

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