jolanta brodzicka

JOLANTA BRODZICKA

Institute of Nuclear Physics, Krakow

November 05, 2003

Doubly charmed B decays

B D(*)D(*)K

( for ~140 fb-1 )

JOLANTA BRODZICKA November 05, 2003

B D(*) D(*) K

Plan

b c c s transition “wrong-sign” D production physics motivations analysis details preliminary results ( for ~140 fb-1 ) Dalitz-plot analysis summary


B D(*) D(*) K

Mechanisms of BD(*)D(*)K decays

( 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

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

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

22 decay modes + c.c


B D(*) D(*) K

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?) charm deficit B D(*) D(*) K : significant (~1/2) contribution to b ccs transitions precise BF’s measurements needed

B0 D(*)+ D(*)- K0S to probe both sin2 and cos2


B D(*) D(*) K

Analysis details at least 5 good tracks with abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm R2< 0.3 K± : P(K/) > 0.4 ± : P(/K) > 0.1 electron veto: el_id < 0.95 K0

S abs( M(+ -) - MKs ) < 15 MeV only good_Ks

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

D±, D0 and D*±, D*0 reconstruction ( N(D)>1 : p(D) < 2. GeV in (4S) system )

B±, B0 reconstruction : all possible (22 + c.c) physical combinations D(*)D(*)K B vertex fit: with IP and B lifetime constraints Mbc > 5.2 GeV -0.40 < E < 0.35 GeV


B D(*) D(*) K

D0

reconstruction

D0 K D0 K3 D0 K0

D0 Ks D0 KKD0 KsKK

D(*) plots for ~ 11fb-1 (exp17)

• vertex fit (refit 0 )

• M (DREC) cut: ± 20MeV

• (D0 K0 : - 50MeV)

• constraint_mass fit

BF ~ 28%

for skimmed sample (with DDK candidate )

(doesn`t applied for these plots)


B D(*) D(*) K

D± reconstruction

D± K D± Ks

D± Ks0 D± KsK D± KK

BF ~ 15%

• reconstruction procedure like in D0 case

D(*) plots for ~ 11fb-1 (exp17)

D±


B D(*) D(*) K

D*± reconstructionD(*) plots for ~ 11fb-1 (exp17)

D*± D0 ± BF ~ 68%

• vertex fit

(constraints :IP, B)

• abs(M(D*)-M(D)-mPDG)< 2.5MeV

( D*± D± 0 hopeless )

D0 KD0 K3 D0 K0

D0 Ks

D0 KK D0 KsKK


B D(*) D(*) K

D*0 reconstructionD(*) plots for ~ 11fb-1 (exp17)

• vertex fit

(constraints :IP, B) refit 0 (vtx_constraint)• abs(M(D*)-M(D)-mPDG)< 5MeV

D*0 D0 0

BF ~ 62%

D0 K D0 Ks D0 K0


B D(*) D(*) K

Multi-candidates events treatment

more than 1 candidates in the same B sub-mode• multi D(*) candidates per event • D(*)D(*) combinations with different K`s

~3. B cand per event ( all sub-modes )

D, D* probabilities (LR):

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

S(S(MMDD**))

S(S(MMDD**))++

S(MD), B(MD)parameterization from MD fitB(MB(MDD))

LR_D (MLR_D (MDD) ) =S(MS(MDD))

S(MS(MDD))++

S(MD*), B( MD*) parameterization

from MD* fit


B D(*) D(*) K

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 ( very efficient )

JOLANTA BRODZICKA November 05, 2003B D(*)D(*)K

B+ D0D0K+

S=94.4 ± 13.0

eff = ( 4.80 ± 0.14 ) *10-4

BF = ( 1 .30 ± 0.18 ± 0.21 ) * 10-3

E

N/7

.5M

eV

N/2

MeV

Mbc

LR > 0.04

Plot for Mbc>5.27 GeV

plot for abs(E)<25MeV

Fully reconstructed signal (from 2dim likelihood fit)

XNSIG_1 94.4 ± 12.9

XE0_1 -0.32E-02 ± 0.11E-02

XEW_1 0.59E-02 ± 0.07E-02

XM0_1 5.2815 ± 0.28E-03

XMW_1 0.25E-02 ± 0.04E-02

(external+internal W-emission)

JOLANTA BRODZICKA November 05, 2003B D(*)D(*)K

B0 D-D0K+

S= 127.6 ± 15.3

eff = ( 5.70 ± 0.14 ) *10-4

BF = ( 1 .75 ± 0.21 ± 0.29 ) * 10-3

E

N/7

.5M

eV

N/2

MeV

Mbc

LR > 0.01

Plot for Mbc>5.27 GeV

plot for abs(E)<25MeV

Fully reconstructed signal (from 2dim likelihood fit)

XNSIG_1 127.6 ± 15.3

XE0_1 -0.19E-02 ± 0.09E-02

XEW_1 0.55E-02 ± 0.07E-02

XM0_1 5.2812 ± 0.39E-03

XMW_1 0.26E-02 ± 0.03E-02

(external W-emission)


B D(*)D(*)K

B0 D*-D0 K+ LR > 0.05

Fully reconstructed signal(from 2-dim Mbc vs.E likelihood fit)

XNSIG_1 86.9 ± 10.6

XE0_1 -0.19E-02 ± 0.09E-02

XEW_1 0.69E-02 ± 0.09E-02

XM0_1 5.2807 ± 0.41E-03

XMW_1 0.30E-02 ± 0.03E-02

eff = ( 2.84 ± 0.07 ) *10-4

BF = ( 2.02 ± 0.25 ± 0.34 ) * 10-3

Plot for Mbc>5.27GeV

Plot for abs(E)<25MeV

E

Mbc

N/7

.5M

eV

N/2

MeV

(external W-emission)

S = 86.9 ± 10.6


B D(*)D(*)K

B+ D0D*0K+ ( right D*K flavor comb.) LR > 0.01 (ext+int)



E

Mbc

Fully reconstructed signal (from 2-dim likelihood fit)

XNSIG_1 49.4 ± 11.6

XE0_1 0.104E-02 ± 0.43E-02

XEW_1 0.18E-01 ± 0.04E-01

XM0_1 5.2819 ± 0.98E-03

XMW_1 0.40E-02 ± 0.08E-02

S = 49.4 ± 11.6

Signif.= 7.0

eff = ( 0.64 ± 0.03) *10-4

BF = ( 5 .30 ± 0.93 ± 0.87) * 10-

3

N/7

.5M

eV

N/2

MeV


B D(*)D(*)K

B+ D0D*+K0

s LR > 0.005

Fit results for directly reconstr. signal (from 2-dim Mbc vs.E likelihood fit)

XNSIG_1 40.2 ± 10.1

XE0_1 -0.13E-02 ± 0.25E-02

XEW_1 0.11E-01 ± 0.03E-01

XM0_1 5.2808 ± 0.80E-03

XMW_1 0.28E-02 ± 0.07E-02

S = 40.2 ± 10.1

Signif. = 7.5



N/2

MeV

N/7

.5M

eV

E

Mbc

(ext)

BF = ( 1 .79 ± 0.45 ± 0.25) * 10-3

eff = ( 1.48 ± 0.06) *10-4


B D(*)D(*)K

B0 D*-D*0K+

XNSIG_1 43.4 ± 10.1

XE0_1 -0.34E-02 ± 0.74E-02

XEW_1 0.31E-01 ± 0.07E-02

XM0_1 5.2814 ± 0.84E-03

XMW_1 0.32E-02 ± 0.07E-02E

Mbc

LR > 0.0 (ext)

Fitting results (2dim fit)



S = 49.4 ± 11.6

Signif.= 7.1

eff = ( 0.49± 0.03) *10-4

BF = ( 5 .82 ± 1.35 ± 0.96) * 10-

3


B D(*)D(*)K

B0 D*-D*+K0s

LR > 0.0 (ext+int)


B D(*)D(*)K

Dalitz plot for

for signal-box events: abs(E)<25MeV Mbc>5.27GeV

M2 ( D0K+ ) right

M2 (

D0

B D

0 )

M ( D0K+ ) right

M ( D0B D0 ) M ( D0B K+ ) wrong

N/1

0M

eV

LR > 0.04

(3770)

B+ D0D0K+

Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box


B D(*)D(*)K

M ( D0B D0 )

M ( D0K+ ) right

M ( D0B K+ ) wrong

mass distr. for B+ D0D0K+ + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/1

0M

eV

LR > 0.1



B D(*)D(*)K

B+ D0D0K+

N /

25M

eV

N /

50M

eV

N /

50M

eV

M ( D0K+ ) M ( D0BK+ )

M ( D0B D0 )

• fitting B signal in DD, DK invariant

mass bins inv. mass distributions without background

fitted B yield PhaseSpace distr. (3-body MC)

(3770)


B D(*)D(*)K

Dalitz plot for

for signal-box events: abs(E)<25MeV Mbc>5.27GeV

M2 ( D0K+ )

M2 (

D0

D-)

M ( D0K+ )

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

N/1

0M

eV

LR > 0.04B0 D-D0K+



B D(*)D(*)K

B0 D-D0K+

SIG_1 15.3 ± 5.6

M0_1 2.577 ± 0.014

MW_1 0.025 ± 0.007

SIG_2 32.5 ± 7.1

M0_2 2.717 ± 0.008

MW_2 0.029 ± 0.006

N /

50M

eV

N /

50M

eV

M ( D0K+ )

M ( D0K+ )

DsJ± (2573) ?

DsJ chiral partner???


B D(*)D(*)K

M2 (

D0

K+

)

M2 ( D*-D0 )

M ( D*-D0 )

M ( D0K+ )

M ( D*-K+ )

Dalitz plot for B0 D*-D0 K+ for signal-box events: abs(E)<25MeV Mbc>5.27GeV

N/1

0M

eV

LR > 0.005

?

Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgr.in signal box

M ( D*-K+ )

also for LR > 0.01


B D(*)D(*)K

M ( D*-D0 )

M ( D0K+ )

M ( D*-K+ )

mass distr. for + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/1

0M

eV

LR > 0.05

Ds1 ? Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

B0 D*-D0 K+


B D(*)D(*)K

B0 D*-D0K+

N

/ 5

0M

eV

N /

50M

eV

N /

50M

eV

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

M ( D*-D0 )


B D(*)D(*)K

Dalitz plot for for signal-box events: abs(E)<25MeV Mbc>5.27GeV

M2

( D

*+K

0s )

M2 ( D*+D0B )

M ( D0K0s )M ( D*+D0B )

M ( D*+K0s )

Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgroundin signal box

N/1

0M

eV

LR > 0.002B+ D0D*+K0s


B D(*)D(*)K

M ( D*+D0B )

M ( D*+K0s )

M ( D0B K0s )

mass distr. for + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/1

0M

eV

LR > 0.05

Ds1 ? Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

B+ D0D*+K0s


B D(*)D(*)K

B+ D0D*+K0s

N

/ 5

0M

eV

N /

50M

eV

N /

150M

eV

N /

100

MeV

M ( D0Ks )

M ( D*+K0s )

M ( D*+K0s )

M ( D*+D0B )

for signal lost box


B D(*)D(*)K

Dalitz plot for B+ D0D*0K+ ( both D*0K flavor comb.)

for signal-box events: abs(E)<45MeV Mbc>5.265 GeV

M2 ( D*0 D0B )

M2 (

D*0

K+

)

M ( D*0K+ ) right

M ( D*0 D0B ) M ( D0K+ ) right

3.87GeVN/1

0M

eV

LR > 0.01

Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgr.in signal box


B D(*)D(*)K

M ( D*0D0B )

M ( D*0K+ ) right

M ( D0K+ ) right

mass distr. for B+ D0D*0K+ + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/1

0M

eV

LR > 0.01



B D(*)D(*)K

B+ D0D*0K+

N

/ 5

0M

eV

N /

50M

eV

N /

50M

eV

N /

50M

eV

M ( D0K+ )

M ( D0B D*0 )M ( D*0 K+ )

M ( D*0 K+ )

for signal lost box


B D(*)D(*)K

Dalitz plot for LR > 0.0 for signal box: Mbc>5.27GeV abs(E)<45MeV

M2 ( D*-D*0 )

M2 (

D*0

K+

)

M ( D*-D*0 )

M ( D*0K+ )

M ( D*-K+ )

~10 events at the threshold at 2.54 GeV come from Ds1± (2536)-> D*0K± ?

B0 D*-D*0K+


B D(*)D(*)K

B0 D*-D*0K+

N

/ 5

0M

eV

N /

50M

eV

N /

100

MeV

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

M ( D*-K+ )


B D(*) D(*) K

LR_D*± vs. M plots

D0 K D0 K3

D0 K0D0 Ks

D0 KK D0 KsKK

LR_D0 vs. D_mass plots

JOLANTA BRODZICKA March 12, 2003B DDK

best B candidate choice method (see my December ICPV talk for more details)

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

S(MS(MDD))

S(MS(MDD))++D probability :

S(MD), B(MD)parameterization from MD fit

B probability for B± D0D0BK± : LR_B = LR_DLR_B = LR_D11 ××

LR_DLR_D22• best B candidate : with max LR_B

LR_DLR_D11 vs. vs. LR_DLR_D2 2 plots plots

(kpi)(kpi) (kpi)(no kpi)

choice method efficiency (for (kpi)(kpi) )

best = 82 %(estimated from rejected MC events DE, Mbc distributions and correlations between accepted and rejected B candidates )

for B± D0D0BK± (kpi)(kpi)reconstr. eff is 15% efficiency lost due to B_best choice method is 0.9%

JOLANTA BRODZICKA March 12, 2003B DDK

LR_B cut(good for bckg reduction and s/b improvement)

LR_D1 * LR_D2 cut

S /

sqrt

(S +

B )

LR_D1 * LR_D2 cut

S /

B

Signal MC: B± D0 D0B K±

Background: B± D0 D0B K± data sideband

( for BF = 1.5 * 10-3 )

JOLANTA BRODZICKA December 12, 2002

B D(*) D(*) K

LR_B cut efficiency LR_B cut: good for background reduction and s /b ratio

improvement

LR_D1 * LR_D2 cut LR_D1 * LR_D2 cut

Back

gro

und

reduct

ion (

DA

TA

)

Effi

cien

cy

reduct

ion (

sig

nal

MC

)

Signal MC: B± D0 D0B K± for all D0D0B combinations

Background: B± D0 D0B K± sideband

allall

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Possibility of Ds1+(2536) detection

Generated 20K MC decays:

B+ Ds1+(2536) D0B (Ds1)=5MeV

Ds1+(2536) D*0 K+ D0,D0B K

For directly reconstr. signal: B+ D*0 K+ D0B

M ( D*0K±)

N 140M0 2536 7.1

For partially reconstr. signal: B+ D0 K+ D0B + missing pion

M ( D0K±)

N 1420M0 2393 5.0

-143MeV shift

N/1

MeV

N/1

MeV

LR > 0.01

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Possibility of X(3872) detection (if any ) Generated 20K MC decays:

B+ X(3872) K+ (X)=5MeV Mmin=M(D*0+D0)X(3872) D*0D0B D0,D0B K

N/1

MeV

N/1

MeV

M ( D*0D0B) M ( D*0D0B)

N 1100 N 3400

For directly reconstr. signal: B+ D*0 D0B K+

For partially reconstr. signal: B+ D0 D0BK+ + missing pion

LR > 0.01

jolanta brodzicka

Documents

event d

k0b0 d

k0b d

kphysics motivations

charmed b decaysb d

charm deficit b d

b case b

submodes d