d 0 k + mass spectra d 0 k + mass spectra for: for: b + d 0 d 0 k + b + d 0 d 0 k + b 0 d - d 0 k +...
TRANSCRIPT
DD00KK++ mass spectra mass spectra for:for: BB++ D D00DD00KK++
BB00 D D--DD00KK++
BB00 D* D*--DD00KK++
for for 25250fb0fb-1 -1
(exp7-3(exp7-377))
Jolanta Brodzicka, Henryk Palka Jolanta Brodzicka, Henryk Palka INP KrakowINP Krakow ICPV meeteingICPV meeteingAugust 5, August 5, 20042004
Outline :Outline : BB++ D D00DD00KK++ BB00 D D--DD00KK++ BB00 D* D*--DD00KK++ for for 250fb250fb-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
E
N/7
.5M
eV for Mbc >5.273 GeV
N/2
.5M
eV
Mbc
for E<18MeV
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 = 1S = 14545..22 ±± 1177..33
GG00((E) = E) = --00..2727E-0E-022 ±± 0. 0.0077E-02E-02 GeV GeV
((E) = 0.E) = 0.5500E-0E-022 ±± 0. 0.0066E-0E-02 2 GeV GeV
GG00(Mbc) = 5.28(Mbc) = 5.281144 ±± 0.000 0.00033 GeV GeV
(Mbc) = 0.(Mbc) = 0.2424E-02 E-02 ±± 0. 0.0022E-0E-022 GeV GeV
SS , , SS22 : regions: regions with missing with missing ,2,2
Fit result:Fit result:
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
SS/B=0.55/B=0.55
BB00 D D--DD00KK++ LR > 0.01LR > 0.01
S = S = 11991.1.33 ±± 1199..22
GG00((E) = E) = - -00.1.177E-0E-022 ±± 0. 0.0077E-02E-02 GeV GeV
((E) = 0.E) = 0.5757E-0E-022 ±± 0. 0.0606E-0E-022 GeV GeV
GG00(Mbc) = 5.28(Mbc) = 5.280808 ±± 0.000 0.00033 GeVGeV
(Mbc) = 0.(Mbc) = 0.2255E-02 E-02 ±± 0. 0.0022E-0E-022 GeV GeV
E
N/7
.5M
eV for Mbc >5.273 GeV
N/2
.5M
eV
Mbc
for E<18MeV
Fit result (Fit result (for fully reconstructed region):for fully reconstructed region):
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
SS/B=0.46/B=0.46
BB00 D D**--DD00KK++ LR > 0.0LR > 0.00505
S = S = 222222..4 4 ±± 2121..55
GG00((E) = E) = - -00..3636E-0E-022 ±± 0. 0.0099E-02E-02 GeV GeV
((E) = 0.E) = 0.9999E-0E-022 ±± 0. 0.1010E-0E-022 GeV GeV
GG00(Mbc) = 5.28(Mbc) = 5.281414 ±± 0.000 0.00033 GeVGeV
(Mbc) = 0.(Mbc) = 0.2266E-02 E-02 ±± 0. 0.0022E-0E-022 GeV GeV
E
N/7
.5M
eV for Mbc >5.273 GeV
N/2
.5M
eV
Mbc
for E<30MeV
Fit result (Fit result (for fully reconstructed region):for fully reconstructed region):
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
SS/B=0.82/B=0.82
ModeModeSignalSignal
for 140fbfor 140fb-1-1eff eff [ 10[ 10-4 -4 ]] BF [ 10BF [ 10--3 3 ]]
SignalSignal
for for 250250fbfb-1-1
BB++ D D00DD00KK++ 94.4 ± 13.094.4 ± 13.0 4.80 ± 4.80 ± 0.140.14
1.30 ± 0.18 ± 1.30 ± 0.18 ± 0.210.21
114545..22 ±± 1177..33
BB0 0 D D--DD00KK++ 127.6 ± 127.6 ± 15.315.3
6.98 ± 6.98 ± 0.140.14
1.68 ± 0.20 ± 1.68 ± 0.20 ± 0.250.25
119191..33 ±± 1199..22
BB0 0 D D**--DD00KK++ 87.0 87.0 ± ± 10.610.6 1.91 1.91 ± ± 0.070.07
2.99 2.99 ± ± 0.37 0.37 ± ± 0.530.53
222.4 ± ± 21.521.5
BF calculations based on 140fbBF calculations based on 140fb-1-1
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
(4160)(4160)
(3770)(3770)
DDsJsJ(2573)(2573)
M2( D0K+ )
DDsJsJ(2720)(2720)
Dalitz plot and projections for Dalitz plot and projections for Background:Background: ellielliptical strip ptical 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
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
DDsJsJ(2720)(2720) reflectionreflection
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 normalized normalized to to number of bckgd. number of bckgd. events in events in signal boxsignal box
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
DDsJsJ(2720) (2720)
DDsJsJ(2573)(2573)
Dalitz plot and projectionsDalitz plot and projections BB00 D D**--DD00KK++ M
2 (
D0K
+ )
M2 ( D0D*- )
M( D0K+ ) M( D*-K+ )
M( D*-D0 )
N /
20
MeV
for signal-box events :for signal-box events : Mbc > 5.273 GeV E<30 MeV (~3 )
N /
20
MeV
N /
20
MeV
LR > 0.0LR > 0.00505
DDsJsJ(2720)(2720) DDsJsJ(2573)(2573)
BackgroundBackground
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
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(D0D0)>3845• (3770) (3770) region removed:
• is the (4160) (4160) contributing tocontributing to 2720 2720 peak peak?
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
BB00 D* D*--DD00KK++
Sig
nal /
50M
eV
M( D0K+ )
• DDsJsJ(2573) (2573)
and DDsJsJ(2720) (2720)
observedobserved
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
M(D0D0) for M(D0K+) > 2.9GeV ( ≡ ½ of the (4160)(4160) helicity distr.)
Sig
nal /
50
MeV
(4160)(4160)
M(D0 D0)
(4160)(4160) contribution to the 11± 5 events
Reflection shape: according to cos2 angular distribution of the polarized (4160)(4160)
M(D0 D0)
Sig
nal /
50
MeV
(4160)(4160)
(3770)(3770)
M(DM(D00DD00) background subtracted distribution) background subtracted distribution for for BB++ D D00DD00KK++
M( D0K+ ) peak at 2.7GeV contributed to the (4160)(4160) and vice versa (they overlap on Dalitz plot)
To estimate of the (4160)(4160) contribution to the 2.7GeV peak:
DDsJsJ(2720) (2720)
• rresonances described by non-relativistic Breit-Wigneresonances described by non-relativistic Breit-Wignerss• 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 spectra (1)mass spectra (1)S
ign
al /
50
MeV
Sig
nal /
50
MeV
fitted B Signal
M( D0K+ )
N = N = 6767..77 ± 1 ± 122.0.0M = 27M = 270000 ± ± 1515 MeV MeV = = 162162 ± ± 4444 MeV MeV
DDsJsJ(2720) (2720)
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
M( D0K+ ) – M(D0K+)„right” - ”wrong” flavour combinations
to remove reflections from charmonium states
N = N = 6565..11 ± ± 88..44M = 27M = 271010 ± ± 77 MeV MeV = = 112112 ± 2 ± 222 MeV MeV
DDsJsJ(2720) (2720)
BB++ D D00DD00KK++ BB++ D D00DD00KK++
non-resonant component + reflection from (4160)(4160)
• rresonances described by non-relativistic Breit-Wigneresonances described by non-relativistic Breit-Wignerss• DDsJsJ(2573)(2573) 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 spectra (2)mass spectra (2)S
ign
al /
50
MeV
Sig
nal /
50
MeV
fitted B Signal
M( D0K+ )
N = N = 113.7113.7 ± 14. ± 14.44M = 271M = 27100 MeV MeV fixedfixed = = 110110 MeV MeV fixedfixed
N = 1N = 122.3 ± .3 ± 33..66 M = 25M = 257373 MeV MeV fixedfixed = 15 MeV fixed= 15 MeV fixed
DDsJsJ(2720) (2720) DDsJsJ(2573) (2573)
BB0 0 D D--DD00KK++
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
N = N = 113113..22 ± 1 ± 199.0.0M = 271M = 27100 MeV MeV fixedfixed = = 110110 MeV MeV fixed fixed
N = N = 3232..55 ± ± 77..99 M = 25M = 257373 MeV MeV fixedfixed = 15 MeV fixed= 15 MeV fixed
DDsJsJ(2720) (2720) DDsJsJ(2573) (2573)
BB0 0 D D**--DD00KK++
M( D0K+ )
Yield M MeV MeVMeV 2/ndf
114 ±±1414
2705 ±±77 110 fixed 15/13
131 ±±2020
2710 fixed
151 ±±3434 14.5/13
138 ±±1919
2695 ±±1111 166 ±±3131 15.4/13
Fit Fit variants:variants:
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 (the boost direction) in B rest framemomentum (the boost direction) in B rest frame
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 corrected for acceptanceSignal corrected for acceptance
DDSJSJ (2573) region:(2573) region: B B0 0 D D--DD00KK+ + signal-box signal-box
2.54 < M(D2.54 < M(D00KK++) < 2.6 GeV () < 2.6 GeV (30 MeV window )30 MeV window )
coscos Compatible withCompatible with J=2 J=2
coscos JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
Acceptance for MCAcceptance for MC::
BB0 0 D D-- DDsJsJ(2573)(2573) (K)(K)
For DDsJsJ(2573)(2573) J=2 J=2
Ang.distribution:Ang.distribution: 9cos9cos44 - 6cos - 6cos22 + 1 + 1
(previously 3-body D(previously 3-body D--DD00K+K+ MC used)MC used)
Eff
. corr
ecte
d s
ign
al
Eff
. corr
ecte
d s
ign
al
Angular distribution (2) Angular distribution (2) DDsJsJ (2720) region:(2720) region: B B DD DD00KK+ + signal-box signal-box
2.64 < M(D2.64 < M(D00KK++) < 2.8 GeV () < 2.8 GeV (80MeV window )80MeV window )
BB0 0 D D--DD00KK++
BB++ D D00DD00KK+ +
coscos
fitted fitted B B Signal corrected for acceptanceSignal corrected for acceptance
Eff
. corr
ecte
d s
ign
al
Eff
. corr
ecte
d s
ign
al
coscos
coscos
coscos
Acceptance for signal MCAcceptance for signal MC BB+ + D D0 0 DDsJsJ(2720)(2720) (K)(K)
For DDsJsJ(2720)(2720) J=2 assumedJ=2 assumed
Ang.distribution:Ang.distribution: 9cos9cos44 - 6cos - 6cos22 + + 11(previously 3-body D(previously 3-body D00DD00K+K+ MC MC used)used)
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
Acceptance for signal MCAcceptance for signal MC
BB0 0 D D-- DDsJsJ(2720)(2720) (K)(K)
For DDsJsJ(2720)(2720) J=2 assumedJ=2 assumed
(previously 3-body D(previously 3-body D--DD00K+K+ MC MC used)used)
Eff
. corr
ecte
d s
ign
al
Eff
. corr
ecte
d s
ign
al
Backup slidesBackup slides
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
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
DD(**) 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
D(*) ± D0 ± M(D*)-M(D)-mPDG) < 2.5MeV vertex fit (cl > 0.)
BB DD(**)DD(**)KK reconstruction reconstruction B vertex fit: with IP and B constraints
Mbc > 5.2 GeV -0.40 < E < 0.35 GeV
AnalysisAnalysis method method
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
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
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
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 /
50M
eV
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
Angular distribution uncorrected for acceptance Angular distribution uncorrected for acceptance fitted fitted B B SignalSignal
coscos
coscoscoscos
DDSJSJ (2573) region:(2573) region: B B0 0 D D--DD00KK+ + signal-box signal-box
2.54 < M(D2.54 < M(D00KK++) < 2.6 GeV ) < 2.6 GeV
DDsJsJ (2720) region:(2720) region: B B DD DD00KK+ + signal-box signal-box
2.64 < M(D2.64 < M(D00KK++) < 2.8 GeV ) < 2.8 GeV
BB++ D D00DD00KK++ BB0 0 D D--DD00KK++
BB0 0 D D--DD00KK++
JJolanta olanta BrodzickaBrodzicka, Henryk Pa, Henryk Pallkaka INP Krakow ICPV August 05, 2004INP Krakow ICPV August 05, 2004
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 Physics motivations
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
_
BB0 0 D* D*--DD00KK++