Sandro De Cecco

1
B-physics at CDFfirst results and perspectives

• Sandro De Cecco
• INFN Roma 1
• Universita di Roma La Sapienza, 11 giugno 2004

2
In this talk

• This talk wont cover all B-physics studies going
  on at CDF.
• I will stress on B physics potentials of CDF
  which are complementary
• to the B-factories outputs.
• In particular I will concentrate on some
  information on CPV and HQ
• that can be extracted from the study of Bs meson
  only accessible at
• the Tevatron collider.
• In this perspective, a selection of relevant new
  results will be described.
• Future projections for Bs topics will be
  highlighted, relying on data and
• current performances for extrapolations.

3
Outline

• Highlights on Bs physics
• CDF detector and B-triggers
• Selection of recent results in Leptonic
  hadronic triggers data samples.
• Projections for Bs mixing measurement first
  studies.
• CDF potential in relevant Bs decay channels,
  expected yields before next generation
  B-experiments.

4
CPV, the CKM picture
CPV at Tevatron in the b-sectorunique
opportunity to study Bs physics.
5
B0s - B0s mixing

• Explore one side of the CKM triangle
• Key experimental issues
• B0s flavor ID at decay
• B0s flavor ID at production (?fl.tagging)
• High Yield with good S/B. (?trigger reco.)
• High resolution on proper decay time (?Vertexing)

World average limit
Dms gt 14.4/ps _at_ (95CL)
6
Bs Lifetime Difference ??s

• Bs system mass eigenstates BH and BL have Dms
  MH ML and DG GL-GH
• With BLpBs qBs (CP-even) and BH pBs q
  Bs (CP-odd)
• ??s/?Ms in SM does not depend on CKM parameters
• ??s determines ?Ms up to QCD uncertainties (20)
• Large ?Ms (hard to measure) ? Large ??s (easy) ?
  complementarity
• Several methods available at Tevatron RunII

• Bs? J/?? (Vector-Vector)
• Angular analysis to separate CP even/odd
  components

Hadronic modes (being evaluated)

• Bs ?Dsp / DsDs
• Fit 2 exponential to known mixture of states
• (ex. Bs?Ds?, Bs?Dsl?)
• Compare with CP eigenstate (ex. Bs?DsDs)

• Bs? KK-
• No angular analysis needed. ( direct CPV ? )
• Compare to Kp mixed mode (but suppressed!)
  10,000 events in
  6.5 fb-1

7
CP violation in B0s

• CP asymmetry in B0s ?J/? ? dominated by b?(cc)s
  probes the
• weak phase of Vts (angle ?s 2?s)
• Also plan to look at Bs?J/??()
• Expected to be small
• sin(2?s ) ?O(l2) ? 0.03
• Complicated analysis requires Dms and angular
  analysis to
• disentangle CP even/odd
  final states
• CDF reach s(sin(2 ?s )) ?0.1 with 2fb1 (?0.06
  with 8fb1)
• If asymmetry observed with 2fb1 ?
  signal for NEW Physics

8
CPV in B0s ?J/? ? (2)

• Current experimental average of CP-asymmetry in
  B0d ?fKs is
• S(f Ks) - 0.15 0.33 (hep-ex/0312024)
• This is 2.7s from sin2b 0.736 0.049
• which is the SM prediction for this asymmetry to
  the percent level.
• Several analysys of this result, in the frame of
  NP (SUSY), allow it to be negative
• If this is true
• In the Bs sector this would imply ? High Dms ( gt
  70 ps-1) (hep-ph/0404001) (april fool?)
• ?ACP(B0s ?J/? ?) i.e sin(2?s) in the tagged
  sample will be
• hopeless for CDF/D0 and very difficult even
  for LHCB BTEV
• Nonetheless untagged time-evolution G(J/? ? t)
  will give information

Recent Input from B-factories
9
The Tevatron pp collider
Superconducting proton-synchrotron 36p?36p
bunches, crossing each 396 ns at vs 1.96
TeV Luminosity.. record peak L
7.2 ? 1031 cm-2 s-1 interactions /
bunch-crossing... lt N gtpoisson 1.5 (at 5 x
1031 cm-2s-1) Luminous region size... 30
cm (beam axis) x 30 mm (transverse)
Improved gt 2x during last year
10
Tevatron plans

• RECYCLER had a first successful test
• Plans beyond FY 05 depends on Recycler ring and
  electron cooling performances
• Will see after aug./nov.04 shutdown

Year Base plan luminosity/yr (fb-1) Design plan Luminosity/yr (fb-1)
FY02 0.08 0.08
FY03 0.20 0.22
FY04 0.31 0.38
FY05 0.39 0.67
FY06 0.50 0.89
FY07 0.63 1.53
FY08 1.14 2.37
FY09 1.16 2.42
Total 4.41 8.56
11
Tevatron FY04 performance
L (pb -1)
FY04 Design
FY04 Base
1st May 2004
2003
1st Jan. 2004
2002

• Tevatron is working very well this year (Design
  plan)
• Record Initial luminosity 7.2 X 1031 sec-1
  cm-2
• Weekly Integrated luminosity 10 pb-1/w
• 350 pb-1 on tape, 100-200 pb-1 used for
  analysis so far

12
The CDF II detector
Completely new
Tracking System
13
CDF II tracking system
TOF 100ps resolution, 2 sigma K/? separation for
tracks below 1.6 GeV/c (significant improvement
of Bs flavor tag effectiveness)
- charge)
TIME OF FLIGHT
CDF Roma

• COT large radius (1.4 m) Drift chamber
• 96 layers, 100ns drift time
• Precise PT above 400 MeV/c
• Precise 3D tracking in ?lt1
• ?(1/PT) 0.1GeV 1 ?(hit)150?m
• dE/dx info provides gt1 sigma K/? separation
  above 2 GeV

• SVX-II ISL 6 (7) layers of double-side
  silicon (3cm lt R lt 30cm)
• Standalone 3D tracking up to ? 2
• Very good I.P. resolution 30?m (20 ?m with
  Layer00)

LAYER 00 1 layer of radiation-hard silicon at
very small radius (1.5 cm)
(achievable 45 fs proper time resolution in Bs ?
Dsp )
14
B Physics at pp collider
BB production mechanics in hadron collider

• Huge cross-section 50-100 ?b
• All B species produced
• Bu,Bd,Bs,Bc,?b, ?b
• with production fractions
• fu fd fs fL 4 4 1 1

• BUT ?(bb) ltlt ?(pp) (65 mb) ? B events have to
  be selected with specific triggers
• Trigger requirements large bandwidth, background
  suppression, small dead-time

15
B physics at CDF

• Typical ?? gt 1 (B-factory 0.56)
• B hadrons are hidden in a x103 larger background
  (?inelastic(pp) ? 50 mb)
• And events are much more complicated than at
  ?(4S)

• Crucial detector components
• - Tracking system
• Excellent pt resolution/Vertexing
• - Trigger
• Large bandwidth
• Strong background reduction
• - Particle identification

16
B physics triggers at CDF II
With the New Silicon Vertex Trigger
Conventional at colliders (Run I)
Di-Muon (J/?) Pt(?) gt 1.5 GeV J/? modes down to
low Pt(J/?)0 (Run II)

Displaced track lepton (e, ?) I.P.(trk) gt
120?m Pt(lepton) gt 4 GeV Semileptonic modes
2-Displaced tracks PT(trk) gt 2 GeV pT gt 5.5
GeV I.P.(trk) gt 120(100) ?m fully hadronic modes

- CP violation - Masses, lifetimes - Quarkonia,
rare decays
- High statistics lifetimes - Sample for tagging
studies
- BS mixing - Charmless decays
17
SiliconVertexTracker the hadronic B trigger

• Online Impact parameter
• Available at Level 2 trigger (20µs latency)
• ?convolution of transverse size of the beam spot
  with the impact parameter resolution of the SVT

- Responsabilty
CDF Roma
s 47 um 35 um 30 um
SVT resolution
Beam spot size
Impact parameter distribution
Compare to offline 46 mm
18
_at_ high Lumi. Dynamic PreScale of had. trigger
19
B(s) physics from Di-Muon triggers
20
Exclusive Bs?J/?f Lifetime
CDF RunII preliminary results (in ps)
B hadron CDF measurement PDG value
B 1.662 /- 0.033 /- 0.008 1.674 /- 0.018
B0 1.539 /- 0.051 /- 0.008 1.542 /- 0.016
(138pb-1) Lb 1.25 /- 0.26 /- 0.10 1.229 /- 0.080
Bs 1.369 /- 0.100 0.008(-0.010) 1.461 /- 0.057
21
B Lifetime summary

• Accurate measurements from Tevatron, still
  statistics-dominated
• Theory errors are still smaller than experiment
• HQETt(B)/t(B0) 1.067 0.027
• t(Bs)/t(B0) 0.998 0.015
• t(Lb)/t(B0) 0.90 0.05
• More B hadrons coming Bc , ?b

22
Polarization amplitudes of Bs?J/YF and Bd?J/YK
Both channels are VectorVector final states ?
The Helicity amplitudes of the 2 Vectors are
correlated

• Measurement for Bd is to be compared to the
  B-factories results
• and gives confidence on Bs
• ?Analysis of Bs?J/YF polarization is the first
  step toward
• DGs/Gs and CPV.

• Measure the angular distributions of decay
  products in transversity basis
• The convenience of transversity basis ( A0 A
  A-) instead of Helicity (H-H0H) is to
  separate CP even ( A0 A ) from CP-odd ( A- )
  eigenstates.

23
B?VV in transversity basis
z
QT
QK
FT
B
K
J/Y
transversity plane
In the J/Y rest frame the transversity plane is
defined by K (?Kp) or f (?KK) decay products and
transversity axis z is orthogonal to it.
24
Transversity amplitudes
Angular distribution
Amplitude parametrization
from measurable distributions of cosQK cosQT
and FK
25
Results
Bs?J/YF
Bd?J/YK
NB17616
NB99358

• Based on 180 pb-1 of integrated Luminosity.
• Data collected with Di-Muon (J/Y?mm-) trigger.
• About 1000 Bd and 180 Bs candidates pass
  selection cuts.
• Bs?J/YF (F?KK-) and Bd?J/YK (K0?Kp-)
• ?Polarization amplitudes measured with an
  un-binned Likelihood fit.

26
Bd?J/YK angular distributions
cosQT
FT

• Main systematic
• K-p misidentification (no PID used)
• Detector acceptance sculpting on
• angular distributions

cosQK
27
Bs?J/YF angular distributions
cosQT
FT

• Main systematic
• Assumption (on limited statistics)
• of equal number of Bs and Bs
• ? reduced form of angular distributions.
• Detector acceptance sculpting on
• angular distributions.

cosQK
28
Polarization results summary
Bd?J/YK
Bs?J/YF

• Results are consistent with previous measurements
  
• Bs?J/YF mostly CP-even state (A02A2) 80 ?
  mostly BsL
• ? This is helpful for CPV analysis
• ? Lifetime measurement dominated by GsL
• if DG/G sizeable ? CDF starts to be
  sensible to this effect.

29
Rare B decays
30
Search for rare B decays Bs(d)?mm-

• SM prediction BR(Bs?mm- ) (3.8 1.0) 10-9
• Several extensions to the SM predict an
  enhancement of this branching ratio by 1 to 3
  orders of magnitude
• If there is not excess we can already constrain
  several SUSY models!

Discriminating variables
Blind analysis cuts were optimized before
looking at the signal mass region
31
Rare B decays Bs(d)?mm-
Final B mass distribution

• No excess has been found
• Limits on the Branching fractions have been set

Submitted to PRL
Bs?mm- Bd?mm-
Background 1.05 /- 0.30 1.07 /- 0.31
Data 1 1
BR limit _at_ 95 C.L. 7.5 X 10-7 1.9 X 10-7
BR limit _at_ 90 C.L. 5.8 X 10-7 1.5 X 10-7
Slighly better results than Belle and BaBar _at_ 90
CL
Best world result
1.6 X 10-7
2.0 X 10-7
32
Bs ? mm- implications for SUSY
CDF BR limits vs. luminosity (Expected/Obs.)
BR 10-7 _at_ 500pb-1
R. Arnowitt et al., PLB 538 (2002) 121, new plot
by B.Dutta
R-parity violating
33
B(s) physics from Hadronic triggers
34
Charmless B decays
35
B(s) ? hhB(s) ? Pseudoscalar VectorB(s) ?
Vector Vector
36
B?h?h? decays at the Tevatron
Bd???, Bd?K?, Bs?K?, Bs?KK
Penguin
Tree
?/K
?/K
Bd/s
Bd/s
?/K
?/K
direct CP
CP from mixing alone
dir
mix
? Bd ? ???? ACP(t) ACP cos(?mdt)ACP
sin(?mdt) ? Bd ? K? ACP (N - N-)/(N
N-) ? Bs ? K? ACP (N - N-)/(N
N-) ? Bs ? K?K? ACP(t) ACP cos(?mst)ACP
sin(?mst)
dir
dir
Bs channels never observed
mix
dir
37
Reconstruction of Charmless 2-body

• Specific trigger path optimized for B?hh

NB 870
Montecarlo
Bd?pp Bd?Kp Bs?KK Bs?Kp
NB 1770

• min(d01,d02) ? 150 ?m
• Lxy (B0) ? 300 ?m
• dB0 ? 80 ?m , d01 d02 lt 0
• I(B0) gt 0.5 (ISOLATION)
• For further back.reduction

Need to separate contributions !
38
Separation of B0?hh- contributions
CDF Roma
Use M?? vs (1-p1/p2)?q1
Use dE/dx calibrated on D (K/p separation 1.4?
pTgt2GeV)
Fit the fractions
39
B ? hh'- results with 65 pb-1

• BR(Bd ?pp) / BR(Bd ?Kp) 0.26 0.11(stat)
  0.06(syst)
• Consistent with B-factories results (0.25?0.06)
• Direct ACP(Bd?Kp) 0.02 0.15(stat)
  0.02(syst)
• fsBR(Bs?KK) / fdBR(Bd?Kp) 0.740.20(stat)0.2
  2(syst)
• First evidence of Bs ?KK- (CDFs largest fully
  reconstructed Bs sample!)

Update on 185pb-1 coming out soon x4 statistics
and smaller syst (mainly dEdx)
40
B ? hh'- future measurements
Expected yields

• Bs?Kp BR ACP measurement
• Limits on Bs?pp, Bd?KK
• Lifetime in Bs?KK ??s
• ACP in Bd?pp,Bs?KK

BsBd BRs alone provide, via U-spin simmetry,
information on g (R. Fleischer hep-ph/0306270)
and checks of CKM model (MatiasLondon,
hep-ph/0404009)
Longer time-scale time dependent ACP in Bs?KK
measure xs independently of penguin pollution
(Fleischer and Matias PRD669 (2002) 054009)
41
time-dep study Angle ? from B0?hh-
B0 ? ??? has two (comparable) decay amplitudes
Penguin
Tree
W
d
p
u
u,c,t
B0
g
d
u
p?
d
direct CP
CP from mixing alone
ACP(t) ACP dir cos(Dmd t) ACP mix
sin(Dmd t)
ACPdir, ACPmix functions of ?, ?, d, ? (d
ei? ? P / T decay amplitude)
R. Fleischer (PLB 459 (1999) 306) Assume
U-spin symmetry (d ? s) Similar relation holds
for Bs ? KK? (Dmd replaced by Dms) The 4
asymmetries can be expressed as function of ?, ?
and P/T amplitude ratio Parameters can be
extracted from fit of meas. of ACP(t) for Bd???
and Bs?KK

42
B?PV B?VV charmless decays

• QCD Factorization provides a predictive framework
  for calculating PV and VV two body charm-less
  decays rate (less good at CP violation
  parameters)
• Recently many authors have combined all the
  available data to fit for the CKM angle g
• D.Du hep-ph/0311135
• N. deGroot et. Al hep-ph/0305263
• Beneke and Neubert Nucl Phys B651, 225
• These fits are as useful in constraining g as all
  other experimental inputs!
• Theorist are now opening the Bs field
• D.Du et al hep-ph/0211154 (PP, PV)
• Y.Yang et al hep-ph/0309136 (VV)
• This is a call for CDF and the hadronic trigger
• Mostly these are rate measurement!
• Provide several crucial tests of QCDF
• Improve overall confidence
• In many respects the same physics motivating B?hh
  study can be done replacing K with K , or Ks
  with K0, and p0 with r . Examples are
• Bs? K K- , Bs? KK- , Bs? K-K , Bs?Kp- ,
  Bs? K0 K0 , Bs ? K0Ks

43
B?PV B?VV charmless decays

• Rich dynamic revealed by Vector-Vector decays
• Angular correlations ? additional observables
  (CKM studies)
• Many Bd,u modes are being measured at B-factories
• B?VV charmless
• Study polarization and CP violation
• Hints for some NP(?) contribution in b?s penguin
  dominated decays
• if NP effects in fKs is true, also visible in
• Bd,u?fK ACP and/or angular distributions
  (hep-ph/0309282)
• Bs?ff ? time dependent CP asymmetry
  (hep-ph/0208091)
• First results (BaBar-Belle) on polarization
  unexpectedly small
• fL(fK ) ltlt fL(rr-)
• How can CDF contribute ?

44
Atwood Soni grid

• Atwood and Soni (hep-ex/010683) proposed a method
  based on the study of angular correlation in pure
  penguin decays (third column) compared to a
  tree-penguin decays which can give g (b?s
  transitions) or a (b?d transitions)

Many of the interesting decay color suppressed !

• Easy analysis ? do not need tagging!
• A lot of useful modes are accessible to CDF with
  SVT trigger, probably CDF can be successful with
  high luminosity
• Bs modes can give additional constraint to the
  Bd,u modes available at B-factories

45
Bs ?VV charmless decays
QCDF predictions (hep-ph/0309136)

• Rich harvest of interesting and unseen decays
  from Bs (hep-ph/0309136)
• Only the p0-less shown in the table here
• Measure them all!
• Interesting ACP possible for self tagging modes
• K0r0

Decay BR(10-6)
K0r0 1.95
KK- 2.10
r0f 1.67
K0K0 3.72
K0f 0.2
ff 36.8
b?d
b?s
Pure penguin
46
B ? ? K
47
BR and ACP for B? ? K
CDF Roma

• BR and direct CP asymmetry measurement
• Luminosity used 180 10 pb-1
• Performed a multidimensional un-binned fit to mB,
  m?, ? helicity and dE/dx PID information.

Legend
total PDF
signal
comb. BG
phys. BG
B? f0K
B? K0?
B? KK-K
B? K?-?

• Yield result from fit N 478
• S/N 1, main resonant background contribution
  from B ? f0K

48
BR for B? ? K
CDF Roma
BR is measured relative to normalization mode
B?J/Y K
Using the PDG value
Which is already comparable precision with
B-factories
49
ACP for B? ? K
CDF Roma
From multidimensional fit, direct CP asymmetry is
also extracted

• BaBar hep-ex/0309025,
• Belle hep-ex/0307014,
• CLEO Phys. Rev. Lett 86, 3718 (2001).
• The Heavy Flavor Averaging Group mean has been
  superimposed.

50
Bs ? ??
51
Observation and BR of Bs ? ??
CDF Roma

• This is an unseen hadronic mode ? search in the
  hadronic trigger.
• Performed a blind analysis optimize cuts a
  priori ? open the box
• Put a limit or measure the BR relative to Bs?J/?
  ? (normalization mode)
• Use Bd?J/? K as control sample for B variables
  and polarizations.
• First analysis using also the Low PT version of
  hadronic trigger.

• Main systematics are
• J/????/ee deconvolution in normalization mode
• Polarization amplitudes and ??s/?s unknowns for
  Bs???
• Poorly measured BR(Bs?J/??) (9.3 3.3)10-4
  (CDF Run1)
• Peaking reflections in blinded region and
  normalization mode.

52
Optimization procedure sidebands choice
CDF Roma
MKK
MKK
MKK
MBs
Bs?J/? ? Optimize for S/v(SB) with S from MC and
B from ? sidebands
Bs??? Optimize S/1.5vB (BR unknown!) with S
from MC and B from ? sidebands
53
Bs?J/?? (the normalization mode)
CDF Roma
(LowPt andNOT Scenario A)
Excellent S/B !
N(Bs?J/YF) 100 after optimized cuts
54
Results for Bs???
CDF Roma
Low PT
Scenario A
Very clean mode!
55
Observation and BR of Bs???
CDF Roma
Probability for the expected BG to fluctuate to
the observed number of events in the hypothesis
of null signal

• ? is the expected BG
• N number of events in signal region

? P 1.2810-6 ? N? 4.7
We measure then the BR, with
Main systematic from normalization mode BR
knowledge
(QCDF Prediction for branching ratio 3.7x10-5
hep-ph/0309136)
?Future measure polarization and relative BR to
Bd?FK
56
B(s) charmed hadronic modes
57
B(s) ? D(s) p (in 119 pb-1)
CDF Roma
Bs ? Ds p
B ? D0 p
Bd ? Dp-
58
BR(Bs ? Ds p )

• Fully reconstructed hadronic Bs decay
• ?Golden mode for Bs mixing measurement
• BR relative to Bd mode (x fs/fd) was measured
• (with 119 pb-1 of hadronic trigger data)

• Using the world average value for

? Future new measure productions fraction fs/fd
with high statistics and several Bs BRs
59
B(s) mixing _at_ CDF
60
B0s - B0s mixing
Was Bs or Bs at the time of decay ? ?
Triggering and reconstructing flavor-specific
final states high ct resolution completely
reco., lower yield ? Bs ?Ds p (Ds ? fp,
KK, ppp) high yield S/B, worse ct res. Missing
PT ? Bs ? Ds l n X Was it a Bs or Bs at
production? ? charge-flavor correlations and bb
production
Jet charge
opposite Kaon
fragmentation Kaon
Ds-
b-hadron
Soft lepton
Primary Vertex
Bs
p
ct
61
Significance of B0s mixing measurement
?Mixing asymmetry ?
SIG(Dms)
Signal / Noise
Effective tagged sample statistics e
efficiency of taggers, D Dilution ( eD2
figure of merit ) N is the Bs yield
vertexing and momentum resolution
62
Improving proper time resolution

• Event by event Primary Vertex determination
• Typical s(Lxy) 40 mm (with convolution of
  30 mm beam spot spread)
• s(t) 70 fs
• If Primary vertex is determined
• For each event with ltNtrkgt 5
• ? s(t) 50 fs

CDF Roma
Reconstructed B
Same side
P.V.
Away side
R-? view (transverse plane)
Opposite B
63
B initial state flavour tagging _at_ CDF
Opposite Side
Jet Charge the sum of charges of the b-Jet
tracks is correlated to the b-flavour ? Away Jet
reconstruction
Soft Lepton (e,m) due to b?lnX The charge of the
l is correlated to b-flavour ? Search lepton from
sec. vtx.
Same Side
SS Pion B0d is likely to be accompanied close in
DR by a p from fragmentation SS Kaon for B0s is
likely to be accompanied close in DR by a
K ?search for p/K from Primary vertex
Opposite Side K due to b?c?s it is more likely
that a B0s meson will contain in final state a K
than a K-. ?search for K from secondary
opposite vtx
64
Flav. Tag. control sample leptrack trigger

• Statistical uncertainty for tagging efficiency
• A typical tagging e0.1,D0.4,eD21.6
• 1000 events eD2 1.60.7 (44)
• 100K events eD21.600.07 (4.4)
• We cant study/optimize the flavor tagging with
  O(1000) events of the reconstructed B signal
• B g J/yK 1000 events/100pb-1
• B g Dp 500 events/100pb-1
• Solution Use Semileptonic B decays in the
  lepton track dataset
• 200K semileptonic B signal events
• High B purity
• Lepton Charge Decay flavor of B

No charm contamination
First Bs(d) mixing limit might be done in
Semileptonic B decays
gt40000 B ? l D0 X decays!
65
Soft muon tagging
After correcting for mixing and sequantial
decays on trigger side the e-D2, expressed in
percent and averaged over eSVT and mSVT data
sample is e D2 0.660 - 0.093
66
(Opposite b) Jet Charge tagging
Qjet Si Qi (Pi Pjet) Si (Pi
Pjet)
Run II PRELIMINARY
67
Bd mixing with Same Side p tagging
Based on correlation between charge of
fragmentation p and flavor of b in B meson
Run II PRELIMINARY
68
Opposite Side Kaon Tagging
CDF Roma
Opposite side Kaon momentum spectra from B0, B,
Bs admixture MC
We can implement OSKT with the use of dE/dx for
higher momentum tracks.

• Issues
• N(B0/B?K)/ N(B0/B?K-)?5 , not infinite,
  intrinsic Dilution.
• Only 20-40 chance for both B in the detector
  acceptance
• Tagging purity depends on TOF resolution.
• Tagging algorithm figure of merit eD2 depends on
  TOF matching efficiency

69
B flavour tagging summary
?D2() Run-I Run-II Projection w/o TOF Projection with TOF Key improvements
SST-?/K 1.50.4 1.00.5 2.0 2.0 - 4.2 Silicon dE/dx, TOF
SLT-? 0.60.1 0.70.1 1.0 1.0 Extend m coverage
SLT-e 0.30.1 --- 0.7 0.7 Plug Cal/ISL
JetQ 1.00.3 0.420.03 3.0 3.0 COT/SVX
OSKT --- --- --- 2.4 TOF
TOTAL 3.4 2.1 6.7 11.3

• Projection for CDF Bs mixing sensitivity are
  currently using
• ?D2 4 (w/o TOF) ?5 (with TOF)

70
Hadronic Yields for Bs mixing

• Currently 1600 / fb-1 of clean hadronic modes

71
CDF Bs mixing prospect with 500pb-1 (had. Modes
only)

• - Dms is the most complex of all B measurement
• Need to combine many ingredients

• With current performance
• S1600 event/fb-1
• S/B2/1
• ?D2 4 (SLTSSTJetQ)
• ?t 0.067ps
• 2? measurement if ?ms15ps-1 from 500pb-1 data
• Beat current limit from indirect measurements
  ?msgt14.4 ps-1_at_ 90 CL (HFAG 03)
• Reach Standard Model favored region (at least!)

this is not much???
72
CDF Bs mixing prospect with 2fb-1

• Expect Tevatron to deliver luminosity of
• 2.11fb-1 (based line) and 3.78fb-1(design) by
  2007
• With modest (sic!) improvement for CDF
• Add Ds ?KK, KsK and Bs?Ds-? ?- ?
• (to update) S1600?2000 event/fb-1
• With improved TOF to enhance both SST and OKT
• ?D2 4 ?5
• With L00 silicon and Event-by-Event beamline
• ?ct 0.067 ? 0.05ps

73
Bs mixing future projections

• 5? measurement if ?ms18ps-1 with 1.7fb-1
  data
• 5? measurement if ?ms24ps-1 with 3.2fb-1
  data

This is not dramatic (covers most of the SM
preferred range) but is this enough?
74
Bs?J/?? CDF prospected harvest
CDF Roma
As measured from 180pb-1 DATA
(LowPt andNOT Scenario A)

N(Bs?J/YF) 100 in the hadronic trigger! (Only
20 are in common with Di-muon J/Y trigger)
N(Bs?J/YF) 180 in the Di-Muon trigger!

• The total CDF Bs?J/YF yield is 1500 / fb-1
• ?? 9000 in 6 fb-1 (hopefully by 2008!
  Before LHCB BTEV)
• Will achieve s(DG/G)0.01?0.03

75
Conclusions from CDF Bs physics

• Dms in the SM range, will be measured with 3.2
  fb-1 in the golden
• (high resolution channels). New limit possible
  soon from semi-leptonic decays.
• DGs/Gs at level from Bs?J/?? before next
  generation B experiments.
• Several Bs?PV, VV modes under study from now on,
  QCDF tests
• CPV studies, polarizations.
• Constrain beyond SM theories with rare B decays
  Bs,d? mm, Kmm, fmm

76
BACKUP slides
77
CDF data tacking performance
Data-Taking Efficiency
Integrated Luminosity
Detector efficiency 85-90
78
CDF II particle ID handles
s
TOF PID

• Specific Ionization of charged particles (dE/dx)
  measurement in the COT gas chamber.
• Time of flight measurement with the new
  scintillator bars detector (TOF) at R1.4m with a
  sTOF 100 ps

dE/dx PID
p
Total K/p separation power of at least 2s for
momentum up to 1.6 GeV/c with TOF And at least
1s for momentum up to 4-5 GeV/c with TOF dE/dx
79
CDF Trigger System Overview

• Crossing 396 ns 2.5 MHz
• Level 1 hardware
• Calorimeter, Muon, Track
• 15kHz (reduction x200)
• Level 2 hardware CPU
• Cal cluster, Silicon track
• 300 Hz (reduction x5)
• Level 3 Linux PC farm
• Offline quantities
• 50 Hz (reduction x6)

80
B trigger rates (Hz)
Now lower MUON ID at L2
81
B hadron Lifetimes in exclusive decays
B ? J/? K ? J/? K B0 ? J/? K0 ?
J/? Ks Lb ? J/? Lc B0s ? J/? ?

• J/? trigger
• Clean
• Fully reconstructed
• Lifetime unbiased
• Low statistics

• Lifetime measurement
• Reconstruct decay length
• Measure pT of decay products

82
Exclusive B?J/?X Lifetimes
Simultaneous fit of Mass and c? distributions
83
Resolutions with current 180pb-1 sample
CDF Run II Preliminary

• Acp(Kp) to 7
• BR(BsKK) to 15
• Yields 130pb-1 CDF 80fb-1 Babar

? (AdirCP )
B0d ? K p -
0.035
1000
4000
Integrated luminosity pb-1
Bd??? 144 ? 23
Bd?K? 576 ? 27
84
B-? D0K- _at_ CDF

• 8 ?2855 228 D0K- events expected in 180 pb-1
• D0CP (KKpp) 228 ? (9.96 3.6 ) 31
  events

only channel with K good with PID
180 pb-1 all triggers 2855 D0p-
8 D0K- (fixed but excluded from the fit)
D0K- sits on the tails of several B channels
85
others and Bs

• Bd ? D0KS(L) (BR 5.0 ? 10-5, Belle) tan(g) in
  an
• unambiguous way, requires time dep. analysis,
  tagging.
• Bs? DsK measures (fg), requires time
  dependent
• analysis, tagging. BR is already a paper level
  analysis.
• Bs? D0KS(L) ,D0K (color suppressed by 1/9,
  contributes to Dms)

DsK fixed in the fit
86
Semileptonic Bs samples
Ds ? fp
Ds ? KsK
Bs ? l Ds X
Yield/Lumi Run I x3 S/N Run I x 2
Ds ? KK
Ds ? p p p