Searches(for(New(Physics( in(Heavy(Flavor(Decays( atCDF( · Angular(ProjecFons(7/23/2012 9 coss-1...
Transcript of Searches(for(New(Physics( in(Heavy(Flavor(Decays( atCDF( · Angular(ProjecFons(7/23/2012 9 coss-1...
Searches for New Physics in Heavy Flavor Decays
at CDF
Robert Harr Wayne State University
BEACH 2012
Outline • The CDF detector • CP violaFon in Bs J/ψ φ • Search for B(s) µµ • b sµµ • B hh CP asymmetries • D0 KK and D0 ππ CP asymmetries • Summary
7/23/2012 2
All results use the full Run 2 dataset.
The CDF Detector
7/23/2012 3
muons 0.6 < |η| < 1.0
muons |η| < 0.6
vertex detector
central tracker
1.4T solenoid
Heavy Flavor Triggers • dimuon trigger – for decays with J/ψ µµ, and rare decays to dimuons – muon pT > 1.5 GeV/c, |η| < 1.0
• displaced vertex trigger – for hadronic charm and bo[om decays – 2 tracks, opposite charge, pT > 2.0 GeV/c – impact parameters 100µm < d < 1000µm
7/23/2012 4
CP ViolaFon in Bs J/ψ φ Decays
7/23/2012 5
7
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DC
E
F-2&4)0&'-)G
SM predicts Fny CP violaFon in Bs mixing.
New physics can be the dominant effect.
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Analysis at a Glance
7/23/2012 6 CDF Public Note 10778
Mass ProjecFon
7/23/2012 7 ]2 Mass [GeV/c-K+ KJ/5.3 5.35 5.4 5.45
2C
andi
date
s pe
r 1 M
eV/c
0
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500
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-1CDF Run II Preliminary L = 9.6 fb 111±10950
Signal Events
Tagging
7/23/2012 8
Predicted OST Dilution0 0.2 0.4 0.6 0.8 1
Mea
sure
d O
ST D
ilutio
n
-1
-0.5
0
0.5
1
1.5
2 - K J/ -B
0.05± = 1.08 -DS
-1CDF Run II Preliminary L = 9.6 fb
-1Mixing Frequency in ps10 20 30
Ampl
itude
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0Amplitude A
-1Sensitivity: 37.0 ps
-1CDF Run 2 Preliminary, L = 5.2 fb
-1Mixing Frequency in ps10 20 30
Ampl
itude
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Same side kaon tagging calib for 5.2`-‐1
Opposite side tagging calib. for 9.6`-‐1
Angular ProjecFons
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cos-1 -0.5 0 0.5 1
Even
ts p
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rad
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900-1CDF Run II Preliminary L = 9.6 fb
cos-1 -0.5 0 0.5 1
Even
ts p
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rad
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Sideband subtracted data
Fit projection
[rad]0 2 4 6
Even
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-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
(dat
a-fit
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-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
(dat
a-fit
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Results: τs = 1.528 ± 0.019 (stat) ± 0.009 (syst) ps
ΔΓs = 0.068 ± 0.026 (stat) ± 0.007 (syst) ps-‐1 |A0(0)|2 = 0.512 ± 0.013 (stat) ± 0.017 (syst) |A||(0)|2 = 0.229 ± 0.010 (stat) ± 0.014 (syst)
δ⊥ = 2.79 ± 0.53 (stat) ± 0.15 (syst) rad
ΔΓs versus CP phase
[rad]J/s
-3 -2 -1 0 1 2 3
]-1
[ps
s
-0.6
-0.4
-0.2
0
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0.4
0.6
-1CDF Run II Preliminary L = 9.6 fb
A. Lenz and U. Nierste, arXiv:1102.4274v1 (2011)1
-1 0.021) ps!|= (0.087 12 2|2
68% CL 95% CL
1SM expectationSymmetry line
2Mixing Induced CP Violation
7/23/2012 10 h[p://www-‐cdf.fnal.gov/physics/new/bo[om/120419.blessed-‐BsJpsiPhi10`/
p-‐value = 54%
HFAG: ΔΓs versus CP phase 0.25
CDF
LHCb
Combined
0.20
0.15
0.10
0.05
0-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
68% CL contours( )
SM
HFAGApril 2012
LHCb 1.0 fb —1+ CDF 9.6 fb —1+ D 8 fb—1
D
7/23/2012 11
Search for B(s) µµ with 9.6 `-‐1 • FCNC decay sensiFve to NP contribuFng in loops. • Predicted branching fracFons are small
• With 7 `-‐1 CDF observed an excess in the Bs window at the 2σ level.
• Want to see if the excess is reinforced or not.
7/23/2012 12
B(B0s → µ+µ−) = (3.2± 0.2)× 10−9
B(B0 → µ+µ−) = (1.0± 0.1)× 10−10
B(s) µµ Analysis Outline • Unbiased (blinded) analysis • Dimuon triggered data • Normalize to B+ J/ψ [µµ] K+ with
• Baseline event selecFon (acc. and eff.) • Neural Net to opFmize expected limit – Reuse NN from 7 `-‐1 analysis without retraining
• EvaluaFon of backgrounds • Unblind the signal region and evaluate 7/23/2012 13
!
BR(Bs(d )0 " µ+µ#) =
NBs (d )
NB +
$%B +
%Bs ( d )
$&B +total
&Bs (d )total $
1&Bs ( d )NN $
fufs$ BR(B+ " J /'K + " µ+µ#K +)
Background EsFmates
7/23/2012 14
]2c [GeV/-massInvariant 5.0 5.2 5.4 5.6 5.8
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andi
date
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/ndf = 70.42/792
]2c [GeV/-massInvariant 5.0 5.2 5.4 5.6 5.8
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-1 = 6.11 fbL dtCDF Run II Preliminary
datatotal
-+ K0B-K+ K0
sB-+ 0B-+ K0
sB-+ K0
b-+ p0
b-K+ K0B
-+ 0sB
multibody B decayscombinatorial bkg
Combinatoric background: -‐ EsFmated from sidebands
-‐ Exclude parFal reconstrucFons
Peaking background: -‐ From B hh’
-‐ MisID probs from D0 Kπ
B0→ µ+µ- Signal Window
7/23/2012 15
SystemaFc uncertainty on mean
background
CC
CF
expected B(B0 → µ+µ−) < 4.0× 10−9 at 95% CLobserved B(B0 → µ+µ−) < 4.6× 10−9 at 95% CL
Bs→ µ+µ- Signal Window
16
CF
CC
p-‐value = 0.94% (bkgd only)
p-‐value = 7.1% (bkgd + SM sig.)
7/23/2012
Excess remains but is not reinforced with addiFonal data.
background-‐only fit returns p-‐value greater than 2σ
Comparison of Results
7/23/2012 17
expected B(B0s → µ+µ−) < 13× 10−9 at 95% CL
observed B(B0s → µ+µ−) < 31× 10−9 at 95% CL
B(B0s → µ+µ−) =
�13+9−7
�× 10−9
@ 95% CL9 10!)-"+"sBF(B0 20 40
-1D0 6 fbPLB 693 (2010) 539
-1CDF 7 fbPRL 107 (2011) 191801
-1CDF 10 fbwww-cdf.fnal.gov/physics/new/bottom/120209.bmumu10fb/
-1ATLAS 2.4 fbarXiv:1204.0735
-1CMS 4.9 fbJHEP 04 (2012) 033
-1LHCb 1 fbarXiv:1203.4493
LHC CombinationCMS-PAS-BPH-12-009
SM Prediction(68% CL region)
June 2012
b sµµ • Also a FCNC decay. • We observe 6 different decay modes. – CDF made first observaFon of Bs φµµ and Λb Λµµ
• Branching fracFons are at the 10-‐6 level. • Increase sensiFvity to NP by looking at angular asymmetries.
7/23/2012 18 h[p://www-‐cdf.fnal.gov/physics/new/bo[om/120628.blessed-‐b2smumu_96/
Start from dimuon trigger Reconstruct HbHsμμ OpFmize event selecFon with NN
b sµµ Analysis
K*0àK+π-‐
φàK+ K-‐
Dimuon mass
12 channel analysis!
K*+àKSπ+
KSàπ+ π-‐
Λàpπ-‐
µµ
B
µµ
B
h
h
K π
π π
π
B0àK*0μμ B+àK+μμ
Bsàφμμ
B0àJ/ψK*0 B+àJ/ψK+
BsàJ/ψφ
Signal mode Control sample
B+àK*+μμ B0àKSμμ
ΛbàΛμμ
B+àJ/ψK*+ B0àJ/ψKS ΛbàJ/ψΛ
Hs hadrons
BR measurement Angular analysis
7/23/2012 19
Rare B Yields with 9.6 `-1
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DifferenFal Branching RaFos
7/23/2012 21
Isospin Asymmetry
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Difference between K(*)+ and K(*)0 rates
LHCb sees a 4σ effect.
Angular analysis
F
B B0
π-‐ μ-‐
K+
μ+
μ-‐
AFB
AT(2)
Aim FB Asymmetry
Transverse polarizaFon asymmetry
Triple product asymmetry
One can extract informaIon from the decay angular distribuIon
cosθμ
cosθK
φ
FL K* polarizaFon
7/23/2012 23
Angular fit results
7/23/2012 24
Simultaneous fit with K*0 and K*+
CDF Public Note 10894
Hb hh’ CP asymmetries • Suppressed charmless decay modes • NP can interfere with SM decay, yielding sizable asymmetries.
• B0s K-‐π+ asymmetry can be used in a model independent test of SM. – M. Gronau and J. L. Rosner, Phys. Le[. B 482, 71 (2000) – H.J.Lipkin, Phys. Le[. B 621, 126 (2005)
• Λb asymmetries could contain interesFng physics.
7/23/2012 25 h[p://www-‐cdf.fnal.gov/physics/new/bo[om/120628.blessed-‐Bhh9`/
]2c [GeV/-+m5.0 5.2 5.4 5.6 5.8
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sB-+ 0B-K+ K0B
+- K0sB
- pK0b
- p0b
-+ 0sB
Multibody B decaysCombinatorial bkg
datatotal
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-1 = 9.30 fbL dtCDF Run II Preliminary
Fit to the B hh’ data • Complex fit of – 8 modes – with complex shapes
– and backgrounds
• Use more than just inv. mass
• Correct for det. effects
7/23/2012 26
Inputs to the Fit
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]c [GeV/tot
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-+ K0B-K+ K0
sB-+ 0B+- K0
sB- pK0
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b-K+ K0B
-+ 0sB
Multibody B decaysCombinatorial bkg
-1.0 -0.5 0.0 0.5 1.0
Can
dida
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-+ K0B-K+ K0
sB-+ 0B+- K0
sB- pK0
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- - +-4 -2 0 2 4
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- - +-4 -2 0 2 4
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per 0
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- + +
-4 -2 0 2 4
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-+ K0B-K+ K0
sB-+ 0B+- K0
sB- pK0
b - p0b -K+ K0B
-+ 0sB
Multibody B decaysCombinatorial bkg
- + +
-4 -2 0 2 4
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dida
tes
per 0
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-1 = 9.30 fbL dtCDF Run II Preliminary
ptot β
κ++κ-‐ κ+-‐κ-‐ Tracking based
dE/dx based
]2c [GeV/-+m5.0 5.2 5.4 5.6 5.8
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data
total-+ K0B-K+ K0
sB-+ 0B+- K0
sB- pK0
b- p0
b-K+ K0B
-+ 0sB
Multibody B decays
Combinatorial bkg
mππ
Corrected B hh’ CP Asymmetries
7/23/2012 28
ACP(B0 ! K+!") = "0.083± 0.013 (stat .)± 0.003 (syst .),
ACP(B0s ! K"!+) = +0.22± 0.07 (stat .)± 0.02 (syst .),
ACP(!0b ! p!") = +0.07± 0.07 (stat .)± 0.03 (syst .),
ACP(!0b ! pK") = "0.09± 0.08 (stat .)± 0.04 (syst .)
CDF Public Note 10726
D0 KK and D0 ππ CP asymmetries • Predicted to be small in the SM – early predicFons were less than 10-‐4 – but predicFons for charm are difficult.
• Real difficulty is to cancel detector induced asymmetries.
• The KK and ππ asymmetries are of opposite sign in SM – the difference is parFcularly sensiFve – and most detector asymmetries cancel in the difference
• Use D*+ D0 π+ and c.c. to tag D0 producFon flavor.
7/23/2012 29
h[p://www-‐cdf.fnal.gov/physics/new/bo[om/120216.blessed-‐CPVcharm10`/
h[p://www-‐cdf.fnal.gov/physics/new/bo[om/100916.blessed-‐Dpipi6.0/
]2-mass [GeV/c+-Invariant K1.8 2 2.2 2.4
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610× 3445±) = 7257239 +- K0N(D
/ndf = 250/2322
)-1Data (5.9 fbFit
RS KD WS KD
D Multibody D decaysCombinatorial backg.
/
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/ndf = 385/3042 2007±) = 2476700 +
s) +- K (0 D +N(D*
)-1Data (5.9 fb
Fit
Random pions
/
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352±) = 106169 +s) -+ (0 D +N(D*
)-1Data (5.9 fb
Fit
Random pions
/
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Data Driven CorrecFons
ACP(ππ) = ArawCP (ππ∗)−Araw
CP (Kπ∗)+ArawCP (Kπ)
7/23/2012 30
Weight events to match pT and η distribuFons. * indicates D* tagged decay.
Individual Mode Asymmetries
7/23/2012 31
ACP (π+π−) = [0.22± 0.24(stat)± 0.11(sys)] %
ACP = AdirCP +
� ∞
0ACP (t)D(t)dt ≈ Adir
CP +�t�τ
AindCP
Measured CP asymmetry is a combinaFon of direct and indirect CP asymmetries.
Line in the direct-‐indirect asymmetry plane.
ACP (K+K−) = [−0.24± 0.22(stat)± 0.09(sys)] %World’s best measurements.
) [%]-+0(DindCPA
-1 -0.5 0 0.5 1
) [%
]-
+0
(Ddi
rC
PA
-2
0
2
CDF
2008RABAB
Belle 2008
No CPV
2-dim 68% CL2-dim 95% CL1-dim 68% CL
) [%]-K+K0(DindCPA
-1 -0.5 0 0.5 1
) [%
]- K+ K
0(D
dir
CP
A-2
0
2CDF
2008RABAB
Belle 2008
No CPV
2-dim 68% CL2-dim 95% CL1-dim 68% CL
Charm Asymmetries: • 2010 – 2011: CDF measures ACP in D0 ππ and D0 KK separately PRD 85, 012009 (2012)
7/23/2012 32
CDF: Charm Detector Facility?
CDF Δ ACP Measurement: • For ΔACP measurement, selecFon can be loosened, and full data set used more than doubling the staFsFcs.
• Cross check with data binned in different η, φ regions.
7/23/2012 33
5
10
15
20
310×+s) -+ (0 D +D* -
s) -+ (0
D -D*
)-1Data (9.7 fbFit
D decaysMultibody
Random pions
CDF Run II Preliminary
2.005 2.01 2.0150
10
20
30
40
50 +s) -K+ K (0 D +D*
2.005 2.01 2.015 2.02
-s) -K+ K (
0D -D*
]2-mass [GeV/cs0Invariant D
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/c
∆ACP = (−0.62± 0.21± 0.10)%arXiv:1207.2158
HFAG CombinaFon of All ΔACP Results
7/23/2012 34
AindCP = (−0.03± 0.23)%
AdirCP = (−0.66± 0.15)%
indCPa
-0.02 -0.015 -0.01 -0.005 0 0.005 0.01 0.015 0.02
dir
CP
a
-0.02
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
0.02 BaBarCPA BelleCPA LHCbCPA CDF Prelim.CPA
LHCbA BaBarA BelleA
Summary • CDF results with the full run II dataset. • CP violaFon in Bs J/ψ φ is tending to SM pred. • Search for B(s) µµ and b sµµ consistent with SM
• B hh’, D0 KK, and D0 ππ CP asymmetries provide tests of the SM
• More results are in the pipeline
7/23/2012 35