New Results for Heavy Flavors and QCD tests at the Tevatron

1
New Results for Heavy Flavors and QCD tests at
the Tevatron
Donatella Lucchesi INFN and University of
Padova For CDF and D0 Collaborations
August 16 - 22 Beijing, China

• Outline
• QCD jets physics
• Heavy Flavor
• B Lifetimes and Bs Lifetime difference
• Charmless B Branching Ratios and CP Asymmetry
• D0 Branching Ratios and CP asymmetries
• B excited states
• B mixing

2
Jet Physics at 2 TeV
Jet, W, ?

• Jet Cross Sections
• new physics and
• PDFs uncertainties _at_ high PT
• soft contribution _at_low PT
• W jet production
• B jet production

jet
Why _at_ 2 TeV? Big increase in cross section thanks
to new
3
Inclusive Jet Cross section

• Run I cone algorithm unfolding
• ETjet range increased by 150 GeV
• Comparison with pQCD NLO
• (over almost nine orders of magnitude)

Data dominated by jet energy scale NLO error
mainly from gluon at high x
4
Inclusive Jet Cross section vs y
Important gluon-gluon and gluon-quark
contributions at high- ET
Gluon pdf at high-x not well known room for SM
explanation.
Constrain on gluon distribution at high x
5
Dijet Mass Cross section

• Resonances or excess at high mass
• new particles
• quark compositeness

data/theory agree within large systematic
errors (mainly jet-energy scale)
6
Inclusive Jet PT Cross section
Agreement with theory within systematic
uncertainties (dominated by jet-energy scale)
Hadronization correction needed?
NLO uncertainty due to gluon _at_ high x
7
Inclusive Jet Cross sectionKT algorithm

• Inclusive KT algorithm
• Infrared and collinear safe
• No merging / splitting

(yi-yj)2(?i ?j)2
jet size

• Reasonable data-theory agreement
• NLO still needs to be corrected for Hadronization
  /Underlying Event

8
Inclusive Jet Cross Section KT vs D
D0.5
D0.7
D1
Frank Chlebana and Andrey Korytov talks for
details
Increasing D data departs from pQCD NLO ? more
soft contributions
9
W jets production

• Background to top and Higgs Physics
• Stringent test of pQCD predictions
• Test Ground for Matrix-Element
• Parton Shower techniques
• (Alpgen Monte Carlo Herwig Monte Carlo)

LO Wjets
Energy scale
10
Heavy flavor production B-jet
CDF

• D0
• muonjets data
• b-tagging using pT of
• muon relative to jet axis.

• b-quark tagged using
• displaced secondary
• vertices

• invariant mass of
• tracks belonging to
• these vertices
• determines b fraction

L150 pb-1
L3.4 pb-1
11
Beauty and Charm production at Tevatron
Cacciari, Frixione, Mangano, Nason, Ridolfi com
pared data to FONLL and MC_at_NLO (JHEP07
(2004) 033)
L37 pb-1
Hb?J/?
L5.8 pb-1
Data ? 29 ? 6?b, FONLL ?27.5
(CTEQ6M,mb4.75,??0)
See Paul De Jong talk
renormalization/factorization scales
12
B and D Physics at the Tevatron

• High cross sections optimized trigger
  detector ?
• possibility of high precision measurements
• All b-hadron and c-hadron species are produced

• Constrain the Standard Model and search for new
  physics

• B Lifetimes, Bs Lifetime difference
• Branching Ratios and CP Asymmetries
• B decays
• D decays
• B states
• B mixing

13
b-hadrons Lifetime

• Lifetime Ratios

• test HQET QCD at NLO

hep-ph/0407004
14
B/B0 Lifetime Ratio Results
CDF
B0?J/?K0
B?J/?K
L240 pb-1
L240 pb-1
?B/?B0 1.0800.042(tot.)
B???D(2010)-X (mostly B0)
D0
B???D(2010)-X (86 B0)
ratio in bin of visible proper decay length
B ?? ? D0X (82 B)
?B/ ?B0 1.0930.021(stat.)0.022(syst.)
?B/?B0 1.0860.017(tot.) W.A.
15
?b/Bd Lifetime Ratio
?b?J/??0
B0?J/?K0s
250 pb-1
0.217
??b 1.221 (stat.)0.043(syst.)
-0.179
W.A.
??b 1.229 0.080(syst.)
0.169
??b/?Bd0.874 (stat.)0.028(syst.)
-0.142
0.87?0.05 from theory
16
b-hadrons Lifetime

• Lifetime Ratios

• test HQET QCD at NLO

hep-ph/0407004

• Bs Lifetime Difference

• ?mmH-mL? 0 and ???L-?H ? 0

• SM expectation ??Bs/?Bs (7-14)x10-2

Fermilab-Pub-01, 197

• Bs? J/?? Pseudoscalar?Vector-Vector

• Decay amplitude 3 linear polarization states

• Bs,Light?CP even, Bs,Heavy?CP odd (different
  angular distribution)

17
Bs Lifetime difference Bs0?J/??
D0 result ready soon !!
Fit the decay rate as function of A0, A, A?,
?L, ??
A0 0.7500.0170.012 A
(0.4730.0340.006)e(2.860.220.07)i A?
(0.4640.0350.007)e(0.150.150.04)i ?B0
1.540.050.02 ps
B0
Consistent with B factories results
B0s
A0 0.7840.0390.007 A
(0.5100.0820.013)e(1.940.360.03)i A?
(0.3540.0980.003) ?? 0.47 0.01
ps-1 ??/? 0.65 0.01
0.25
-0.33
0.19
-0.24
??/?0 excluded with P 1/315 ??/?12 excluded
with P 1/84
18
B0s Lifetime Bs0?J/?? one component
337 events
D0
CDF
Ratio respect to Bd0?J/?K0
?s/?d 0.890 0.072(tot.)
0.075
19
Charmless B Decays
Marco Rescigno presentation
Charmless Bs ???
First evidence

• Measure ??
• Extract information on ? and ?
• Direct CP small ? test SM

BR(Bs???) (1.40.60.20.5)x10-5
Charmless Bd,s ? hh- (?,K)
See Giovanni Punzi talk

• Measured relative Bs/Bd Branching Ratios
• Determine ??(Bs?KK) and compare to ??(Bs?J/??)
• Measure direct CP Bd?K?- eventually also
  Bs?K-?
• Extract ?, eventually

20
Branching Ratios and CP AsymmetriesB?hh
Decay B
Bd?K?- 509
Bd???- 134
Bs?KK- 232
Bs?K-? ---
Agrees with B-factories
BabarACP -0.1330.030(stat.)0.009(syst.)
Belle ACP -0.1010.025(stat.)0.005(syst.)
21
B. R. and CP Asymmetries in D Decays
?(D0 ?KK)/?(D0 ?K?) (9.920.11(stat.)0.12(syst.
))
better than PDG (10.230.21)
?(D0 ???)/?(D0 ?K?) (3.5940.054(stat.)0.040(sy
st.))
better than PDG (3.620.10)
CP Asymmetry A ??(D0?f)-?(D0?f)/??(D0?f)?(D0?f
)

• Tag D0 flavor
• using ? charge
• from D

better than PDG (2.12.6)
better than PDG (0.51.6)
More Charm in Alessandro Cerri talk
22
Resonant structures in B?? system at D0
Orbitally excited states L1, B
?20 MeV/c2
?150 MeV/c2
?mJ1/2, J3/2100 MeV/c2
J3/2
In this analysis
L350 pb-1
N536?114
First Evidence
M(B1)5724?4(stat.)?7(syst.) MeV/c2
B2?B?
M(B2)-M(B1) 23.6?7.7(stat.)?3.9(syst.)
MeV/c2
?1?2 23?12(stat.)?9(syst.) MeV/c2
B1?B?, B?B?
B2?B?, B?B?
23
Mixing and CKM Triangle
?md0.5020.007 ps-1
Re(Vts)0.04 gt Re(Vtd)0.007
?ms?? ?md
Parameter Value Error 99 Probability
? 0.3480.028 0.275-0.418
? 0.1720.047 0.051-0.302
sin(2?) 0.7250.033 0.627-0.793
sin(2?) -0.160.26 -075-0.48
?o 61.57.0 42.3-81.6
?ms(ps-1) 18.31.6 15.1-27.0
World Average limit ?ms gt 14.4 ps-1
24
B mixing what we need
Opposite Side
fragmentation particle ?, K
1. Final state reconstruction
?,K
3. Tag B flavor at production time
2. High resolution on proper decay length
measure efficiency ? and dilution D ?D2 gives
the effective number of events
25
Bd mixing Results
Philip Gutierrez talk for details
Bd mixing measurements ? test the machinery for Bs
Soft ? tagger
Opposite Side taggers
?m0.5060.055(stat)0.049(sys) ps-1
Combined tagger
?D2() CDF D0
SST 1.04?0.35?0.06 1.00?0.36
Soft ? 0.698?0.042 1.00?0.38
Soft e 0.35?0.05(stat) -
Jet-Q 0.715?0.027 1
?m0.5360.037(stat)0.009(s.c)
0.015(sys) ps-1
0.051
-0.027
?D2 1.820 ?0.114 ()
26
Bs Mixing Sensitivity Limit
D0 will have soon Ds ?KK
D0 Yield37/pb-1
CDF Yield10/pb-1
CDF Baseline ?D2 1.6 ?t 67 fs
CDF Stretched ?D2 2.6 ?t 47 fs
?ms 9 ps-1
?ms 15 ps-1
27
Bs Mixing sensitivity Limit (Combined Datasets)
Bs?Ds3?
CDF Baseline ?D2 1.6 ?t 67 fs
Semileptonic and hadronic decays Bs?Ds? and
Bs?Ds3? Ds ??? Ds ??? Ds ?3 ? Ds
?KK
?ms14 ps-1
CDF Stretched ?D2 2.6 ?t 47 fs
?ms23 ps-1
28
Bs Mixing sensitivity CDF Reaches
5? observation
?ms19 ps-1 6 times more data
CDF Stretched ?D2 2.6 ?t 47 fs
?ms24 ps-1 10 times more data
29
Summary Conclusions

• Rich program at the Tevatron !
• QCD
• different jet algorithms
• constrain gluon PDFs at high x
• study boson jet physics
• measure B jet cross section
• Beauty and Charm competitive with dedicated
  experiments
• CP being investigated in B and D decays
• Lifetimes measured for B0, B?, Bs and ?b
• All the machinery for Bs mixing measurement
  ready

keep an eye on the Tevatron something could be
around the corner.
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Backup slides
31
The Machine
Chicago
D0
CDF
Tevatron

• Lgoalpeak
• 2x1032s-1cm-2
• 36 bunches
• 396 ns crossing
• time
• 1.8?1.96 TeV

Booster
p source
Main Injector Recycler
32
TeVatron Luminosity

• Peak luminosity
• Best 1.01x1032
• Delivered/on tape
• 660/520 pb-1
• 450 pb-1 available for analysis now

Delivered
On tape
33
The D0 Detector

• Upgraded muon coverage
• New Tracking System
• New Silicon Micro-vertex
• New Solenoid
• New Pre-showers

34
The CDF Detector
35
Jet Physics at 2 TeV Jet algorithm

• Measurements performed at
• hadron level.
• Theory known at parton level
• Hadron ? parton transition
• depends on parton shower
• modeling
• Jet algorithm definition is
• fundamental to compare data
• and theory
• Use of cone based algorithm
• in ?-? space

36
Prospect for B?hh

• Systematic uncertainty at the same level
• ?(CDF) ?(Babar)/0.7 for same size samples
• CDF currently has 3 times more events on tape
• same yields as current 200fb-1 Babar
• Expect ACP measurement at 4.5 level from
  available data
• (does not account for latest improved tracking
  and inclusion of TOF in PID)

37
Bs Mixing sensitivity semileptonic decays
CDF Baseline ?D2 1.6 ?t 67 fs
?ms15 ps-1
CDF Stretched ?D2 2.6 ?t 47 fs
?ms9ps-1
38
Bs Mixing sensitivity hadronic decays
Yields per 250 pb-1 Bs?Ds? and Bs?Ds3?
Ds ??? 320 Ds ??? 90 Ds ?3 ? 115 Ds
?KK 200
CDF Baseline ?D2 1.6 ?t 67 fs
?ms20 ps-1
?ms9ps-1
CDF Stretched ?D2 2.6 ?t 47 fs
39
Rare Decays Bd,s???
See Matt Herndon talk
Only via Flavor Changing Neutral Current in SM
BRSM(Bs? ??- )(3.40.5) ? 10-9 BRSM(Bd? ? ?-
)(1.000.14) ? 10-10
Large enhancements predicted in other Models
MSSM, mSUGRA, SO(10) ,RVP
CDF
D0
BR(Bs???)lt 3.810-7 _at_90 C.L.
BR(Bs ???)lt 5.810-7
90C.L.
BR(Bd ???)lt 1.510-7
40
Bd,s??? Future
SO(10)
Combined BR(Bs???)lt 2.7x10-7 _at_90 C.L.
New limits exclude large regions of previously
allowed parameters
Contours of constant BR(Bs???)
Allowed by Dark Matter constraints
MSSM