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

!"#$%&'()%&*#%*#+,

-.

/01(2,

! !"

"#$%&'#$()*+&,-) #

#()./)#,)*0-1#2'-1)'$)3-)"-04),5&%%6

$% &'! 7-8)*+4,#2,)*&0'#2%-,)09((#(:)#()'+-)5#;#(:)1#&:0&5)5&4)-(+&(2-

#! %&0:-) #

2%-&0)#(1#2&'#$()$<)7-8)=+4,#2,)>)

1$5#(&(')2$('0#39'#$(<0$5)'$*)?9&0@)

! A(&%$:$9,%4)'$)'+-)(-9'0&%)()

,4,'-56)!"

"#$%&'#$()#()(#

,4,'-5)#,)&22-,,#3%-)'+0$9:+)#('-0<-0-(2-)$<)1-2&4,)8#'+)&(1)8#'+$9')5#;#(:B

7-8)=+4,#2,*&0'#2%-,)C)

DC

E

F-2&4)0&'-)G

SM predicts Fny CP violaFon in Bs mixing.

New physics can be the dominant effect.

!"##$%&$$#'(")"%'$#*+,"-$.)&/$012+$

3,+-'#$%&$$#'(")"%'$456'7',8&99$

:'1";$%*/'$%&$2,&<$%*/'$'7&-=%*&,$

>-"7&)$%"++*,+$%&$#'(")"%'$?$.)&/$ $

:*/=&,$%)*++')$

@..-*,'$#'-'1%*&,$

A');$1&/(-'B$-*2'-*C&&9$.*%D$EE$(C;#*1"-$(")"/'%')$FG$,=*#",1'H$=#'$/"##D$",+-'#D$9'1";6%*/'$",9$()&9=1%*&,$.-"7&)$9*#%)*0=%*&,#$

IJK$LMELD$5)"+='$ G$N=,'$EL%C$LMEL$

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

100

200

300

400

500

600

700

800

-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

7/23/2012 9

cos-1 -0.5 0 0.5 1

Even

ts p

er 0

.01

rad

0

100

200

300

400

500

600

700

800

900-1CDF Run II Preliminary L = 9.6 fb

cos-1 -0.5 0 0.5 1

Even

ts p

er 0

.01

rad

0

100

200

300

400

500

600

700

800

900

Sideband subtracted data

Fit projection

[rad]0 2 4 6

Even

ts p

er 0

.03

rad

0

100

200

300

400

500

600

700

800

900

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1

(dat

a-fit

)/

-5

0

5

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1

(dat

a-fit

)/

-5

0

5

0 1 2 3 4 5 6

(dat

a-fit

)/

-5

0

5

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

0.2

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

2 cC

andi

date

s pe

r 10

MeV

/

500

1000

1500

/ndf = 70.42/792

]2c [GeV/-massInvariant 5.0 5.2 5.4 5.6 5.8

2 cC

andi

date

s pe

r 10

MeV

/

500

1000

1500

-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

7/23/2012 20

DifferenFal Branching RaFos

7/23/2012 21

Isospin Asymmetry

7/23/2012 22

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

2 cC

andi

date

s pe

r 10

MeV

/

1

10

210

310

410-+ K0B-K+ K0

sB-+ 0B-K+ K0B

+- K0sB

- pK0b

- p0b

-+ 0sB

Multibody B decaysCombinatorial bkg

datatotal

]2c [GeV/-+m5.0 5.2 5.4 5.6 5.8

2 cC

andi

date

s pe

r 10

MeV

/

1

10

210

310

410


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

7/23/2012 27

]c [GeV/tot

p5 10 15 20 25 30

cC

andi

date

s pe

r 0.5

MeV

/

0

500

1000

1500

2000

]c [GeV/tot

p5 10 15 20 25 30

cC

andi

date

s pe

r 0.5

MeV

/

0

500

1000

1500

2000


datatotal

-+ K0B-K+ K0

sB-+ 0B+- K0

sB- pK0

b- p0

b-K+ K0B

-+ 0sB


-1.0 -0.5 0.0 0.5 1.0

Can

dida

tes

per 0

.04

0

500

1000

1500

-1 = 9.30 fbL dtCDF Run II Preliminary datatotal

-+ K0B-K+ K0

sB-+ 0B+- K0

sB- pK0

b - p0b -K+ K0B

-+ 0sB

MultibodyB decaysCombinatorialbkg

- - +-4 -2 0 2 4

Can

dida

tes

per 0

.1

0

500

1000

datatotal

-+ K0B-K+ K0

sB-+ 0B+- K0

sB- pK0

b - p0b -K+ K0B

-+ 0sB


- - +-4 -2 0 2 4

Can

dida

tes

per 0

.1

0

500

1000


- + +

-4 -2 0 2 4

Can

dida

tes

per 0

.1

0

500

1000

datatotal

-+ K0B-K+ K0

sB-+ 0B+- K0

sB- pK0

b - p0b -K+ K0B

-+ 0sB


- + +

-4 -2 0 2 4

Can

dida

tes

per 0

.1

0

500

1000


ptot β

κ++κ-‐ κ+-‐κ-‐ Tracking based

dE/dx based

]2c [GeV/-+m5.0 5.2 5.4 5.6 5.8

2 cC

andi

date

s pe

r 10

MeV

/

500

1000

1500

2000

2500

]2c [GeV/-+m5.0 5.2 5.4 5.6 5.8

2 cC

andi

date

s pe

r 10

MeV

/

500

1000

1500

2000

2500-1 = 9.30 fbL dtCDF Run II Preliminary

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

2C

andi

date

s pe

r 5 M

eV/c

0

0.5

1

1.5

2

610× 3445±) = 7257239 +- K0N(D

/ndf = 250/2322

)-1Data (5.9 fbFit

RS KD WS KD

D Multibody D decaysCombinatorial backg.

/

-202

]2-mass [GeV/cs0Invariant D

2.005 2.01 2.015 2.02

2C

andi

date

s pe

r 0.1

MeV

/c

0

50

100

150

310×

/ndf = 385/3042 2007±) = 2476700 +

s) +- K (0 D +N(D*

)-1Data (5.9 fb

Fit

Random pions

/

-2

0

2


2.005 2.01 2.015 2.02

2C

andi

date

s pe

r 0.1

MeV

/c

0

2000

4000

6000

8000/ndf = 325/3082

352±) = 106169 +s) -+ (0 D +N(D*

)-1Data (5.9 fb

Fit

Random pions

/

-202

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*


2C

andi

date

s pe

r 0.1

MeV

/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

Searches(for(New(Physics( in(Heavy(Flavor(Decays( atCDF( · Angular(ProjecFons(7/23/2012 9 coss-1...

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