J OLANTA B RODZICKA

JOLANTA BRODZICKA

INSTITUTE OF NUCLEAR PHYSICS, KRAKOW BGM Nov 21, 2003

Doubly charmed B decays

B D(*)D(*)K

( for ~140 fb-1 )

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

Outline

b c c s transition “wrong-sign” D production physics motivations analysis method preliminary results ( for ~140 fb-1 ) : signals and BF’s

D(*)K and D(*)0 D0 mass spectra ( search for X(3872)→ D*0D0 )

summary and conclusions

B+ D0D0K+ B0 D-D0K+ B0 D*-D0 K+B+ D0D*0K+

B+ D0D*+K0s

B0 D*-D*0K+ B+ D*-D*+K0s (no BF yet)

( I ) through external W emission amplitudes

( II ) internal W emission amplitudes (color-suppressed)

( III ) external +internal W emission amplitudes

b cW - c c s + dd (uu) pair creation

B+ D(*)0 D(*)+ K0

B0 D(*)- D(*)0 K+

B+ D(*)+ D(*)- K+

B0 D(*)0 D(*)0 K0

22 decay modes + c.c

B0 D(*)- D(*)+ K0

B+ D(*)0 D(*)0 K+

Leading quark diagrams B D(*)D(*)K decays


Physics motivations


B D(*)D(*)K : good place to explore spectroscopy:

X DD cc-bar states above DD threshold scarcely known ((3770) (4040) …) molecular charmonia ( X(3872) ? ) , ccqq states, ccg hybrid states… Y D(*)K from W vertex

c s : L= 0 0- Ds(1970) 1- D*s

(2112) well known

L= 1 jP = 1/2+ 0+ DsJ

± (2317) 1+ DsJ± (2457) seen, do not decay

to DK

( chiral doublet to Ds± Ds*± ) jP = 3/2+ 1+ Ds1

± (2536) 2+ DsJ± (2573) not seen in B decays

( do chiral partners exist?) measurement of the BF’s and their ratios: important for understanding of factorization, color suppression and ‘charm deficit ’ in B decays B0 D(*)+ D(*)- K0

S to probe both sin21 and cos21

Analysis details


accepted events with: R2< 0.3

tracks with : abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm

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

K0S : abs( M(+ -) - MKs ) < 15MeV only good_K0

s

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

D(*) reconstruction D0 K, K3, K0, Ks, KK BF ~ 28% of total

D± K, Ks, KK, KsK BF ~ 12% of total

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

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

D*± D0 ± abs(M(D*±)-M(D)-mPDG) < 2.5MeV D*0 D0 0 abs(M(D*0)-M(D)-mPDG) < 5MeV vertex fit (cl > 0.) applied B reconstruction : all (22 + c.c) physical combinations D(*)D(*)K

B vertex fit: with IP and B constraints

Mbc > 5.2 GeV -0.40 < E < 0.35 GeV

Multi-candidates events treatment > 1 candidates in the same B sub-mode

several D(*) candidates per event D(*)D(*) comb. with different K`s

D, D* probabilities (LR):

B(B(MMDD**)) LR_DLR_D**

( ( MMDD* * )=)=

S(S(MMDD**))

S(S(MMDD**))++

S(MD), B(MD) and S(MD*), B( MD*) parameterization from MD and MD* fitsto data ( “inclusively” reconstr. D(*) )

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

S(MS(MDD))

S(MS(MDD))++


MMDD

MMDD

MMDD** MMDD**

LRLR

LR LR

D(*) plots for ~11fb-1 sample after preselection p(D) < 2GeV in (4S) system

Choice of the best B candidate

( for each B decay sub-mode separately )

LR_B = LR_DLR_B = LR_D(*) (*) ×× LR_D LR_D(*)(*)

best B candidate : with max LR_B equal LR_B case ( B`s differ only in K ) : larger K±_ID or better K0

S mass candidate chosen

B probability ( LR_B )

S/(S+B) choice method “combines” both criteria: (M-MPDG)/ and S/B ratio

LR_B used also for background discrimination


LR_B cutLR_B cut(good for background reduction and S/B improvement)

S /

sqrt

(S +

B )

Signal MC:

Background: Mbc sideband

( for BF=1.5 * 10-3 )B+

D0D0K+ B+

D0D0K+ JOLANTA BRODZICKA BGM Nov 21, 2003B D(*) D(*) K

LR_D0 * LR_D0 cut

B+ D0D0K+

no LR cut

LR > 0.04

LR > 0.1

E

for Mbc>5.27GeV

N/7

.5M

eV

N/7

.5M

eV

N/7

.5M

eV

Signal MCSignal MC

DataData

B+

D0D0K+


BB00 D D--DD00KK+ + & a little bit more on & a little bit more on methodmethod

E

N/7

.5M

eV plot for Mbc >5.27 GeV

N/2

MeV

Mbc

plot for abs(E)<25MeV

LR > 0.01

S= 127.6 ± 15.3 Stat_signif.= 10.9eff = ( 6.98 ± 0.14 ) *10-4

BF = ( 1 .68 ± 0.20 ± 0.25 ) * 10-3

For fully reconstr. signalFor fully reconstr. signal::

My fitting method: 2dim Mbc vs. E unbinned likelihood fit:

L_Sig(Mbc, E) = S•( G (Mbc) • G (E) )

+ S•( G (Mbc) • G (E) )

+ S2•( G (Mbc) • G (E) )2

L_Bckg (Mbc, E) = B•ARG (Mbc) • POL_2 (E) L= L_Sig + L_Bckg

lostlost

22 lost lost

Yields for 3 regions:Yields for 3 regions: S S = 127.6 ± 15.3 fully reconstr.

SS = 728.7 ± 53.1 partially reconstr.: B0 D-D*0 K+ B+ D-D*+K+ B0 D*-D0K+

SS22 = 972.8 ± 68.0 partially reconstr.:

B0 D*-D*0 K+ B+ D*-D*+ K+

All parameters are kept free.They are in agreement with MC


E

N/7

.5M

eV

plot for Mbc >5.27 GeV

N/2

MeV

Mbc


plot for Mbc >5.265GeV

E

N/7

.5M

eV plot for abs(E)<45MeV

Mbc

N/2

MeV

BB++ D D00DD00KK+ + LR > 0.04

BB++ D D00D*D*00KK++ LR > 0.01

S = 94.4 ± 13.0

Stat_signif.= 9.3eff = ( 4.80 ± 0.14 ) *10-4

BF = ( 1 .30 ± 0.18 ± 0.21 ) *

10-3

S = 49.4 ± 11.6

Stat_signif.= 7.0

eff = ( 0.39 ± 0.03 ) *10-4

BF = ( 8.84 ± 1.56 ± 1.5) * 10-

3


plot for Mbc>5.27GeV

E

N/7

.5M

eV

BB00 D* D*--DD00 K K++ LR > 0.05plot for abs(E)<25MeV

N/2

MeV

Mbc

eff = ( 1.91 ± 0.07 ) *10-4

BF = ( 2.99 ± 0.37 ± 0.53 ) * 10-3

S = 86.9 ± 10.6Stat_signif.= 12.8

BB00 D* D*--D*D*00KK++ LR > 0.0

E


S = 43.4 ± 10.1

Stat_signif.= 7.1

eff = ( 0.34± 0.03) *10-4

BF = ( 8.44 ± 1.97 ± 1.33) * 10-3


Mbc


BB++ D D00D*D*++KK00ss LR > 0.005


N/7

.5M

eV

E


N/2

MeV

Mbc

S = 40.2 ± 10.1

Stat_signif. = 7.5

BF = ( 5.80 ± 1.46 ± 1.18) * 10-3

eff = ( 0.46 ± 0.06 ) *10-4

SS = 248.4 ± 22.6 D0(-,0,γ)D*+K0

s

(maybe can be useful for time dependent analysis)

BB00 D* D*--D*D*++KK00ss LR > 0.0

v. clean (no LR-cut used)(good_K0S used, looser selection should give more)

S = 17.

5.10 ± 0.90 ± 0.750.3977.9 ± 13.7

( 49.4 ± 11.6)B+ → D*0 D0 K+

8.84 ± 1.56 ± 1.500.3949.4 ± 11.6B+ → D0 D*0 K+

8.44 ± 1.97 ± 1.330.3443.4 ± 10.1B0 → D*- D*0 K+

5.80 ± 1.46 ± 1.180.4640.2 ± 10.1B+ → D0 D*+ K0

2.99 ± 0.37 ± 0.531.9187.0 ± 10.6B0 → D*- D0 K+

1.68 ± 0.20 ± 0.256.98127.6 ± 15.3B0 → D- D0 K+

1.25 ± 0.17 ± 0.204.9994.4 ± 13.0B+ → D0 D0 K+

BF [10-3]

∑ (eff*BFsec)

[10-4]

NS

__

__

__

__

BF summary


Look for resonant structure: e.g.Dalitz plot & projections for


BB00 D D--DD00KK++

M( D0K+ )

M(

D0D

- )

M( D0K+ )

N /

10M

eV

S +

B /

50M

eV

M( D0K+ )

Mbc sideband normalized to background in signal box

for signal-box events:

2dim Mbc vs. E fit in M( D0K+ ) bins(to filter out bckg from Dalitz-plot projection)

abs(E) < 25 MeV Mbc > 5.27 GeV

( fitted S+B gives good description of data )

Sbins - Sglobal ~1

M ( D0D- ) M ( D-K+ )

fitted S

fitted B(plotted above bckg)

DD00KK++ resonant structure


B+ D0D0K+

B0 D-D0K+

B+ D*0D0K+

SIGNAL with subtracted bckg

fitted functions: BW +&Phase Space shape from 3body signal MC with free normalization (to describe non-resonant

component)

S /

50

MeV

S /

50

MeV

M( D0K+ )

PS corrected for (3770)D0D0 contribution)

M( D0K+ ) - M( D0K+ )“right”-”wrong” flavor comb

S /

50

MeV

S /

50

MeV

N = 30.2 ± 5.7

M = 2.728 ± 0.013 GeV

= 0.080 ± 0.020 GeV

N = 80.2 ± 11.7

M = 2.714 ± 0.008 GeV

= 0.080 GeV fixed

N = 15.1 ± 5.1

M = 2.720 GeV fixed

= 0.080 GeV fixed

N = 30.2 ± 8.4

M = 2.723 ± 0.014 GeV

= 0.084 ± 0.029 GeV

N = 8.1 ± 2.3

M = 2.573 GeV fixed

= 0.015 GeV fixed

DSJ(2573)

Peak @ ~2730 sth new!


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


B+ D0D*0K+

N /

50

MeV

Phase Space shape from 3body signal MC

B+ D0D0K+

fitted functions: BW +sqrt(1-thr/x)*POL_3

N = 25.0 ± 5.8M = 3.770 GeV fixed = 0.0253 GeV fixed

Other resultsOther results

M ( D0 D*0 )

S /

25

MeV

M ( D0D0 ) Search for X(3872)→D0D*0

confirmation of (3770)→D0D0 (in 10MeV bin) : 2 evts observed, 1 evt expected bckg

90% UL by counting method (Feldman-Cousins)

BF(B+→K+X(3872))xBF(X(3872)→ D0D*0) < 2.37x10-4

in B+ D0D0K+

BF(B+→K+ (3770))xBF((3770)→ D0D0) = ( 3.0 ± 0.7 ± 0.5 )x10-4


Summary

I have shown preliminary results ( for ~140 fb-

1 ) : signals and BF’s for following channels:

I studied D(*)K and D(*)0 D0 mass spectra:

B+ D0D0K+ B0 D-D0K+ B0 D*-D0 K+B+ D0D*0K+

B+ D0D*+K0s

B0 D*-D*0K+

BF(B+→K+X(3872))xBF(X(3872)→ D0D*0) < 2.37x10-4

B+ D*-D*+K0s (no BF yet)

(3770)→D0D0 in B+ D0D0K+ confirmed

90% UL

evidence >3 for DsJ(2573) D0 K+ in B0 D-D0K+

X D0 K+ @ ~2730 MeV and width ~80MeV observed (sth new !) in B0 D-D0K+ B+ D0D0K+ B+ D0D*0K+

Backup slides


[%] D0 D0 K+

D- D0 K+ D*- D0 K+ D0 D*+ K0

D*- D*0 K+ D0 D*0 K+

track eff. 8.3 8.2 13.8 13.8 13.0 7.9

K-id 5.9 5.6 5.8 4.0 5.4 5.1

Pi-id 2.6 2.7 3.0 3.0 2.6 2.4

Pi0 eff. 0.6 0.5 0.9 1.6 2.1 4.8

K0s eff. 0.6 2.7 0.7 4.6 1.3 0.6

MCstat& BFsec

2.8 2.4 2.5 4.4 6.5 5.1

Fit 10.0 7.0 5.0 5.0 5.0 10.0

16.3 14.7 17.8 20.3 15.8 14.6

BF systematic error decomposition per mode


BF[10-3] this analysis(@140 fb-1)

Babar(@75.9fb-

1)

B+ → D0 D0 K+ 1.25 ± 0.17 ± 0.20 1.9 ± 0.3 ± 0.3 + R.Chistov(88 fb-1) 1.19 ± 0.24 ± 0.18

B0 → D- D0 K+ 1.68 ± 0.20 ± 0.25 1.7 ± 0.3 ± 0.3

B0 → D*- D0 K+ 2.99 ± 0.37 ± 0.53 3.1 ± 0.4 ± 0.4 + E.Heenan(78.1fb-1) 1.66 ± 0.33 ± 0.35

+ Cleo (3fb-1) 4.5 ± 2.3 ± 0.8

B+ → D0 D*+ K0 5.80 ± 1.46 ± 1.18 5.2 ± 1.0 ± 0.7 -

B0 → D*- D*0 K+ 8.44 ± 1.97 ± 1.33 11.8 ± 1.0 ± 1.7 + E.Heenan(78.1fb-1) 8.77 ± 0.80 ± 1.88

+ Cleo (3fb-1) 13.0 ± 5.4 ± 2.7

B+ → D0 D*0 K+ 8.84 ± 1.56 ± 1.50 4.7 ± 0.7 ± 0.7

B+ → D*0 D0 K+ 5.10 ± 0.90 ± 0.75 1.8 ± 0.7 ± 0.4

_

_

_

_

BF comparison with other measurements


Tracking eff / ch.track

1.5%

Slow_pi+ tracking eff. 5.0%

K_id eff. /kaon 2.0%

pi_id eff. /pi 1.0%

pi0 eff. /pi0 3.0%

K0s eff. /K0s 4.5%

MC stat+BF_sec 2-6%

N(BB) 0.5%

Fit variants 5-10%

Decay model 7%

MC stat+BF_sec 2.8% 2.4% 2.6% 3.8% 5.8% 5.4% 5.4%

Decay model 7.0% 7.0% 7.0% 7.0% 7.0% 7.0% 7.0%

BF systematic error contributions

- negligible contributions from selection cuts (wide mass window cuts, no vtx cuts)


Mbc & E “movie”

from 2dim Mbc vs. E fit in M( D0K+ ) 50MeV bins for BB00 D D--DD00KK++ signalsignal


2.35 < M( D0K+ ) < 2.55 GeV 2.55 < M( D0K+ ) < 2.75 GeV 2.75 < M( D0K+ ) < 2.95 GeV


Mbc & E “movie”

from 2dim Mbc vs. E fit in M( D0K+ ) 50MeV bins for BB00 D D--DD00KK++ signal signal

2.95 < M( D0K+ ) < 3.15 GeV 3.15 < M( D0K+ ) < 3.35 GeV

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