cdf 実験の最新結果
DESCRIPTION
CDF 実験の最新結果. 筑波大学 佐藤構二 6/23/2011 首都 大学 東京. Contents. Introduction Tevatron Accelerator, CDF and D0 Detectors. Top Physics Direct Search for Higgs Bosons Standard Model Higgs MSSM Higgs Bosons B Physics Exotic Physics Searches at CDF Summary. Introduction. Tevatron Run II. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/1.jpg)
CDF実験の最新結果
筑波大学 佐藤構二6/23/2011首都大学東京
![Page 2: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/2.jpg)
Contents
• Introduction– Tevatron Accelerator, CDF and D0 Detectors.
• Top Physics• Direct Search for Higgs Bosons
– Standard Model Higgs– MSSM Higgs Bosons
• B Physics• Exotic Physics Searches at CDF• Summary
![Page 3: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/3.jpg)
Introduction
![Page 4: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/4.jpg)
Tevatron Run II First collision in Run 0
was in 1985 (26 years ago!!)
collisions at =1.96 TeV (1.8 TeV in Run I).
Run II started in Summer 2001.
Collisions at world highest energy until Nov 2009.
Two multi-purpose detectors for wide range of physics studies.
![Page 5: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/5.jpg)
Tevatron Run II — Luminosity Status
• Typical Peak Luminosity : 4 1032 cm2 s-1.• Delivers 70 - 80 pb-1/week.• Integrated Luminosity: 11.3 fb-1
– Recorded by CDF: 9.5 fb-1.• Recent CDF analyses typically use up to ~7 fb-1.• Typical data taking efficiency of CDF: ~ 85% No significant drop after 10 years of running!!
(CDF)
![Page 6: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/6.jpg)
Tevatron Plans• 2010: strong discussion on 3 year extention of Tevatron up to FY2014.• LHC was planning to shutdown a whole year in 2012.• Tevatron was expected to compete with LHC in SM Higgs searches.
20112.4σ in MH<180 GeV
2014”>3σ Evidence”In 100<MH<180 GeV の
Summer 2010Dataset
SM Higgs Discovery Potential of Tevatron (2010 Projection)
Recommendation 1: The panel recommends that the agencies proceed with a three-year extension of the Tevatron program if the resources required to support such an extension become available in addition to the present funding for HEP. Given the strong physics case, we encourage the funding agencies to try to find the needed additional resources. (October 26, 2010, P5 report)
![Page 7: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/7.jpg)
Tevatron Termination
![Page 8: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/8.jpg)
Tevatron Termination
Tevatron will close at the end of FY2011 (Sep 30, 2011)
![Page 9: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/9.jpg)
Tevatron v.s LHC
TEVATRON LHC (current) LHC (design)
Particles Collided p - pbar p - p p - p
CM Energy (TeV) 1.96 7 14
Inst. Lum (cm-2 s-1) Record 4.05 x 1032 1.2 x 1033 1 x 1034
Integ. Lum (fb-1) 11.5 1.1 --
![Page 10: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/10.jpg)
Collider Detector at FermilabMulti-purpose detector
Tracking in 1.4 T magnetic field. Coverage |h|<~1.
Precision tracking with silicon. 7 layers of silicon detectors.
EM and Hadron Calorimeters. sE/E ~ 14%/E (EM). sE/E ~ 84%/E (HAD).
Muon chambers.
![Page 11: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/11.jpg)
Collider Detector at Fermilab~600 physicists from
12 nations and 61 institutionsMcGill Univ.Univ. of Toronto
Argonne National Lab.Baylor Univ.Brandeis Univ.UC DavisUC Los AngelesUC San DiegoUC Santa BarbaraCarnegie Mellon Univ.Univ. of ChicagoDuke Univ.FermilabUniv. of FloridaHarvard Univ.Univ. of IllinoisThe Johns Hopkins Univ.LBNLMITMichigan State Univ.Univ. of MichiganUniv. of New MexicoNorthwestern Univ.The Ohio State Univ.Univ. of PennsylvaniaUniv. of PittsburghPurdue Univ.Univ. of RochesterRockefeller Univ.Rutgers Univ.Texas A&M Univ.Tufts Univ.Wayne State Univ.Univ. of WisconsinYale Univ.
JINR, DubnaITEP, Moscow
Univ. Karlsruhe
Univ. of Geneva
Glasgow Univ.Univ. of LiverpoolUniv. of OxfordUniv. College London
Univ. of Bologna, INFNFrascati, INFNUniv. di Padova, INFNPisa, INFNUniv. di Roma, INFNINFN-TriesteUniv. di Udine
IFAE, BarcelonaCIEMAT, MadridUniv. of Cantabria
LPNHE, Paris
KHCL
KEKOkayama Univ.Osaka City Univ.Univ. of TsukubaWaseda Univ.
Academia Sinica
USA Canada
Russia
Germany
Switzerland
UK
Italy
Spain
France
Korea
Japan
Taiwan
![Page 12: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/12.jpg)
D0 Detector
• Silicon detector covering up to |h|<3 rapidity
• Compact scintillating fiber tracker• 2.0 Tesla axial B field• Hermetic U/liquid Ar calorimeter• Extended muon coverage
Multi-purpose detector
![Page 13: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/13.jpg)
Top Physics
![Page 14: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/14.jpg)
Top Physics at Tevatron• Top quark was observed at
TEVATRON in 1995.• Top is still the least studied
observed particle.• Any deviation from SM might
suggest new physics!!• Top mass is unexpectedly heavy
~35mb.– Special role in EWSB? p
p tb
W-
q
q’
t b
W+
l+
n
X
Production cross-section
Resonance production
Production kinematics
ttbar Spin correlation
Top Mass W helicity
|Vtb|
Branching Ratios
Rare/non SM Decays
Anomalous Couplings
CP violation
Top lifetime
Top Charge
Top Width
_ _
_
_
BR (%) Bkgd.
Di-lep. 5 Low
L+jets 30 Moderate
All had. 44 High
+X 21 -ID hard
ttbar decay modes:
![Page 15: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/15.jpg)
Top Pair Cross Section (L+jets)
~85% ~15%
• Top quark is mostly produced in pairs at Tevatron.
Event selection:• 1 lepton Pt>20, |h|<2.0• MET>25• ≥3 jets with Pt>20 , |h|<2.0 • ≥ 1 jet b-tagged
stt = 7.14 ± 0.34 (stat.) ± 0.58 (syst.) ± 0.14 (theory) pb (4.3 fb-1)
stt = 7.04 ± 0.34 (stat.) ± 0.55 (syst.) ± 0.43 (lumi.) pb
The dominant luminosity systematic can be canceled out by measuring ratio stt /sZ.
s(NLO) = 7.4 +0.5-0.7 pb
![Page 16: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/16.jpg)
Top Pair Cross Section Summary• Cross section is sensitive to both
production and decay anomaly.• The difference between different decay
modes might indicate new physics.• CDF measures xs with various decay
modes/methods, and the results are consistent with SM.
![Page 17: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/17.jpg)
Forward Backward Assymmetry• CDF Analysis in L+jets channel.• Related to qqbar initial state - specially
interesting at Tevatron.• Interference terms between LO and NLO
diagrams ~5% asymmetry.
tt
q
q
g
g
b
b
W+
W-
l+
n
q’
q
q: lepton chargeyh: rapidity of hadronic top
AFB = 15.8± 7.5 % AFB
SM = 5.8 ± 0.9 % consistent
5.3 fb-1, Summer 2010
![Page 18: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/18.jpg)
Mttbar Dependence of AFB in L+jets at CDF
Mttbar Distribution:
High MassRegion
Low MassRegion
Low Mass Region
Mttbar = 450 GeV
High Mass Region
5.3 fb-1, Winter 2011 update
AFB = 47.5± 11.4 % AFB
SM = 8.8 ± 1.3 % ~3.3 σ deviation
AFB = -11.6± 15.3 % AFB
SM = 4.0 ± 0.6 % consistent
![Page 19: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/19.jpg)
AFB Measurement in L+jets at D0• D0 analysis in L+jets.• Asymmetry defined as:
Dy = ytop – yanti-top
AFB = 8± 4(stat) ±2(syst) %AFB
SM = 1 +2-1 %
Thought not as significant, same trend as CDF!!
4.3 fb-1, Summer 2010
![Page 20: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/20.jpg)
AFB Measurement in Dilepton at CDF
Lepton Dy distribution Full Reconstruction Dy distribution
AobsFB= 43 ±15 (stat) ±5 (syst) %
ASMFB = 6 ±1 % 2.3s deviation
5.1 fb-1, Winter 2011
![Page 21: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/21.jpg)
Mttbar Dependence of AFB in Dilepton at CDF
Mttbar Distribution:
High MassRegionLow Mass
Region
Low Mass Region
Mttbar = 450 GeV
High Mass Region
5.1 fb-1, Winter 2011
AFB = 21.2±9.6 (stat only) % AFB
SM = -4.0 ± 5.5 %
AFB = -10.4±6.6 (stat only) % AFB
SM = 0.3 ± 3.1 %
![Page 22: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/22.jpg)
Single Top Production• Top quark is sometimes singly produced Tevatron.
0.884±0.11 pb (NLO)
1.98±0.25 pb (NLO)
• 1 lepton, MET, 2 or 3 jets• S/B separation by Matrix Element (ME)
Signal ME bkgd ME
st+s-chan = 2.5 +0.7-0.6 pb (3.2 fb-1)
4.3 s effect
t-channel
Vtb
Vtb*
s-channel
Vtb
Vtb*
![Page 23: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/23.jpg)
5.0 s observation!!
t-channel
Vtb
Vtb*
Single Top Combined Result
st+s-chan = 2.3 +0.6-0.5 pb
st-chan = 0.8±0.4 pbss-chan = 1.8+0.7
-0.5 pb
|Vtb| = 0.91 ± 0.11 (exp.) ± 0.07 (theory)
s-channel
Vtb
Vtb*
0.884±0.11 pb (NLO) 1.98±0.25 pb (NLO)
(2010)
|Vtb| > 0.71 at 95% C.L.
![Page 24: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/24.jpg)
W Mass MeasurementCDF, 200 pb-1 (2007)
D0, 1 fb-1 (2009)
Best single measurement of the time. Best single measurement!
![Page 25: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/25.jpg)
W Mass Uncertainty Future Projection
CDF working on 2.3 fb-1 data
![Page 26: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/26.jpg)
W Mass World Average
![Page 27: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/27.jpg)
Top Mass Measurement in L+jets Events (CDF)
t
tq
q
g
g
b
b
W+
W-
l+
n
q’
q15% 85%
100%
100%
Controls background by a Neural Net Discriminant:
Matrix Element
Detector Response Func.
x: parton level momentay: measured momenta
PDFs
2-D likelihood Fit to data :
In-situ JES calibration
1-btag 2>b-tag
Background 261.8 ± 60.6 28.0 ± 9.6’
Top signal 767.3 ± 97.2 276.5 ± 43.0
Observed Data 1016 247
mt = 173.0 ± 0.7 (stat.) ± 0.6 (JES) ± 0.9 (syst.) GeV/c2
= 173.0 ± 1.2 (total) GeV/c2 Best single measurement, 0.7% precision!
![Page 28: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/28.jpg)
Top Mass World Average
![Page 29: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/29.jpg)
Top Mass Uncertainty Future Projection
![Page 30: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/30.jpg)
Constraint to SM Higgs Mass (Jul 2010)
30Mtop = 173.3 ± 1.1 GeV/c2
MW = 80.399 ± 0.023 GeV/c
Precise W and Top Mass measurements constrains the SM Higgs Mass due to the radiative correction:
mH < 158 GeV @ 95% CL (mH = 89.0 +35/-26 GeV) mH < 185 GeV @ 95% CL including LEP2 direct search limit
![Page 31: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/31.jpg)
Constraint to SM Higgs Mass (Jul 2010)
31
mH < 158 GeV @ 95% CL (mH = 89.0 +35/-26 GeV)Mtop = 173.3 ± 1.1 GeV/c2
MW = 80.399 ± 0.023 GeV/c2
In 2003:Mtop = 178.0 4.3 GeV/c2
MW = 80410 32 MeV/c2Mhiggs < 260 GeV/c2 (95% C.L.)
Progress due to the TEVATRON Run II Results
Precise W and Top Mass measurements constrains the SM Higgs Mass due to the radiative correction:
![Page 32: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/32.jpg)
Direct Search for Higgs Bosons
![Page 33: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/33.jpg)
Production Cross Sections
recently observed
![Page 34: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/34.jpg)
SM Higgs Properties at Tevatron
bb WW• mH<135 GeV (low mass):
– gg→H→bb is difficult to see.– Look for WH/ZH with leptonic vector boson decays.
• mH>135 GeV (high mass):– Easiest to look for H→WW with one or two W
decaying to lepton.
![Page 35: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/35.jpg)
WHlbb (low mass)• S/B separation by NN.• Four tagging categories, using 3 algorithms
(including NN tagger).• NN based b-jet energy correction
NN Outputs:
2 tag 1 tag
Observed upper limit4.5 x σ(SM)(@115 GeV)
![Page 36: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/36.jpg)
l
l
• 3 b-tag categories with 2 algorithms.• S/B separation by NN.• Improved lepton coverage with new
loose muon category.• Dominant backgrounds:
– Z+jets, top, diboson
ZH ll+bb (low mass)
(mH=120 GeV)
NN Outputs:
Observed upper limit6.0 x σ(SM)(@115 GeV)
![Page 37: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/37.jpg)
WH/ZHMET+bb (low mass)• Target process: ZHnnbb
– Also complementary to WHlnbb search.
• 3 b-tag categories with 2 algorithms.• S/B separation by NN.• Dominant backgrounds:
– QCD with MET miscalculation– W/Z+jets, top, diboson
(mH=115 GeV)
2 tag 1 tag
Observed upper limit2.3 x σ(SM)(@115 GeV)
![Page 38: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/38.jpg)
H WW*l+ l- (high mass)• Opposite Sign 2 leptons.
– Lepton acceptance improved by using isolated tracks.• S/B separation by NN.
– Matrix element calculation result input to NN.• Dominant background
– DY, Diboson, top• Independently analyses OS/SS 2 leptons + 1/2 jets events to include WHWWW and VBF HWW signal inacceptance.
Observed upper limit :1.08 x σ(SM)(@165 GeV)
Updating for Winter 2011…
![Page 39: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/39.jpg)
Summary of SM Higgs Searches at CDF
![Page 40: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/40.jpg)
SM HiggsCDF and D0 Combined Limits
CDF Combined: D0 Combined:
![Page 41: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/41.jpg)
SM HiggsTevatron Combined Limit
95% CL exclusion : 158 < mH <175 GeV mH<110 GeV (LEP2: mH<114.4 GeV)
![Page 42: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/42.jpg)
SM Higgs Search –competition with ATLAS experiments, March 2011
![Page 43: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/43.jpg)
Tevatron and LHC Summer 2011 Projection
Tevatron Summer 2011~ 8fb-1 / exp.
Tevatron:Exclusion of Mh<180 GeV
ATLAS:Exclusion of 130<Mh<450GeV
Results will be shown in ~1 month!!
![Page 44: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/44.jpg)
Search for MSSM Higgs • Extended Higgs sector in SUSY models
– f = (H0, A0, h0) and H±
• Higgs coupling enhancement at large tan :b– Large increase (×~tan2b) in production cross sections
compared to SM: ggf, gbbf• for MA>100 GeV.
– Br(f )~9%tt– fbb~90%
Useful search modes at Tevatron:• f ττ• f + b ττ + b• f + b bb + b
![Page 45: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/45.jpg)
MSSM ftt• Both experiments analyzed τe τhad, τμ τhad,
τeτμ channels (Opposite Sign)CDF 1.8 fb-1 (2007)
τe τhad+τμ τhad+τeτμ
D0 2.2 fb-1 (2008)
![Page 46: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/46.jpg)
MSSM f tt Tevatron Combination
Combined, 2010
![Page 47: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/47.jpg)
MSSM fbbbb at CDF• Analyze events with 3 b-tagged jets.• Utilizes trigger-level b-tagging.• Fully data-driven multi-jets backgrounds.• Define a flavor separator based on Mvtx for improved
background understanding.
~ 2s deviation from background at ~140 GeV
Di-jet mass, m12 of the leading 2 jets: 2.2 fb-1
![Page 48: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/48.jpg)
MSSM fbbbb at D0• Analyze events with 3 b-tagged jets.• Subdivide candidates into 3- and 4-jets samples.• S/B separation by Likelihood Discriminant.
Likelihood Discriminant:
Di-jet mass:
Upper Limit on Cross Section:
Working on fbbbb TEVATRON combination this summer!!
![Page 49: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/49.jpg)
MSSM fbttb at D0• A new search channel!!• Search in bτμτhad channel.
– Event selection: Isolated m, τhad, MET and a b-tagged jet.• Improve S/B separation using NN-based discriminant.• Dominant Bkg: Z+jets, ttbar, multi-jets.
Reconstructed Higgs Mass (GeV) NN-based Discriminant Upper Limit on Cross Section
![Page 50: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/50.jpg)
Mjj in W+2jets events
![Page 51: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/51.jpg)
Event Selection - Mjj in W+2jets events• 1 e/m: Pt>20 GeV, | |h <1.0• MET>25 GeV to ensure there was a neutrino• 2 jets: Et>30 GeV, |h|<2.4
– (cone size R=0.4 at CDF, R=0.5 at D0)
• Mt(e/m, MET)>30 GeV• Ptjj>40 GeV
• Dhjj<2.5• Df(MET, j1)>0.4
• Thresholds (especially the jet Pt cut) were set high in order to focus on the high dijet invariant mass range.
![Page 52: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/52.jpg)
Mjj Distribution at CDF (4.3 fb-1)
Phys.Rev.Lett.106:171801 (2011)“Invariant Mass Distribution of Jet Pairs Produced in Association with a W boson in ppbar Collisions at sqrt(s) = 1.96 TeV”
• 3.2s deviation from SM.• Corresponds to 4 pb.
March, 2011
![Page 53: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/53.jpg)
Mjj Distribution at CDF (7.3 fb-1)
• 4.8 s deviation from SM.Preliminary update in June 2011.
![Page 54: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/54.jpg)
D0 follow up (4.3 fb-1)
![Page 55: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/55.jpg)
DR(j,j) Distributions
![Page 56: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/56.jpg)
![Page 57: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/57.jpg)
D0 fluctuates the fraction of gg/qg/qq ingredients of the W+2jets MC sample (ALPGEN), while CDF simply trusts the fraction given by ALPGEN.
![Page 58: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/58.jpg)
B Physics
![Page 59: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/59.jpg)
B Production at Tevatron
• Large production rates ~10mb– Ο(100) B bosons every minutes!!– e+e-(4S)B experiments ~1.1nb– Not just BL
• CDF employs displaced-track trigger (SVT), and can collect all-hadronic finial states.
![Page 60: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/60.jpg)
sOscillation (2006)
)cos1(2
1)(prob 00 tmeBB s
tss
Frequency ms~|Vts |2
measurement gave a Strong constraint on the CKM matrix (orange band).
![Page 61: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/61.jpg)
𝐵𝑠→𝜇𝜇
FCNC decay is heavily suppressed in the Standard Model.
SM prediction:
SUSY scenarios boost the branching ratio by up to 100 times.
![Page 62: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/62.jpg)
(3.7 fb-1)
Vertex displacement Candidate track isolation
S/B separation by Neural Net with 7 variables Dimuon mass in signal rich regions
BR( Bd → μμ ) < 7.6x10-9 @95% CL
BR( Bs → μμ ) < 4.3x10-8 @95% CL BR( Bs → μμ ) < 5.1x10-8 @95% CL (D0 6.1 fb-1)
World best limit
![Page 63: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/63.jpg)
Prospect
We are HERE!!
CDF is updating the analysis this summer with 8 fb-1 of data!
Expected to give strong constraint on mSUGRA parameters.
![Page 64: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/64.jpg)
CP Violation in
Bd unitarity triangle Bs unitarity triangle
Decay rate ~ +2
New physics?
![Page 65: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/65.jpg)
CP Violation in (2)
![Page 66: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/66.jpg)
CP Violation in (3)
![Page 67: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/67.jpg)
CP Violation in (4) candidates:
Unbinned likelihood fit to data:
![Page 68: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/68.jpg)
CP Violation in (5)• Previous result from July 2009 was:
2.1s deviation from SM
![Page 69: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/69.jpg)
CP Violation in (6)
May 2010
Consistent with SM.~1s deviation.
![Page 70: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/70.jpg)
Rare Decay
• Could be enhanced by Flavor Changing Neutral Current
New particle could appear in the loop ()
![Page 71: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/71.jpg)
, Branching Ratio Measurements
BaBar Belle CDF (4.4 fb-1)
)
)
--- ---
𝐵→𝐾 ±𝜇𝜇 𝐵→𝐾 ∗(→𝜋±𝐾∓)𝜇𝜇 𝐵→𝜙𝜇𝜇
∼9𝜎 ∼10𝜎 ∼6𝜎
×𝟏𝟎−𝟔World best measurement
Observation
![Page 72: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/72.jpg)
Forward-Backward Asymmetry
• Measure the F-B asymmetry as a function of
![Page 73: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/73.jpg)
F-B Asymmetry Result
• Consistent with SM so far.
, Nov 2009
𝐽 /𝜓
Υ
![Page 74: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/74.jpg)
F-B Asymmetry Result (2)
• Each experiment is consistent with SM within uncertainty.
• Is there a common trend off the SM prediction?• CDF is updating the result with 7 fb-1 data.
Babar: PRD79,031102(2009)Belle: PRL103,171801(2009)
CDF 4.4 fb-1
![Page 75: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/75.jpg)
Exotic Physics Searches
![Page 76: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/76.jpg)
Search for Diphoton Resonance (5.4 fb-
1)• Select events with 2g’s with Et>15 GeV.• Main background: SM 2g and jets faking photons.
Result consistent with SM.Excess around 200 GeV: 13% probability.
Limit on Randall-Sundrum Graviton Production Cross Section:
![Page 77: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/77.jpg)
Dielectron Resonance Search in 2009 (2.3 fb-1)
• A 2.5s excess around Mee=240 GeV mass region!!
![Page 78: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/78.jpg)
Dielectron Resonance Search in 2011 (5.7 fb-
1)• 1 electron with Et>20 GeV, |h|<1.1.• Opposite sign second electron with
Et>20 GeV, |h|<2.8.
Previous excess ~240 GeV is reduced to a 1.7s effect.
Limit on Randall-Sundrum Graviton Production Cross Section:
R-S Graviton Mass Limit (ee+ ggcombined):
![Page 79: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/79.jpg)
Dimuon Resonance Search (4.6 fb-1) • Two opposite sign muons with
Pt>30 GeV, |h|<1.1.
Invariant mass of dimuon
Limits on Z’
![Page 80: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/80.jpg)
W’ Search (5.3 fb-1) • 1 electron with Et>25 GeV, |h|<1.1.• MET>25 GeV.
Mt Distribution:Observed Cross Section Limit:
MW’ > 1.1 TeV (95% C.L.)
![Page 81: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/81.jpg)
g+jets+MET Topology• Model independent search.• 1 electron w/ Et>30 GeV, |h|<1.1.• Jets w/ Et>15 GeV, |h|<3.0.• MET>20 GeV.
• Scanned kinematic plots in 1 and 2 jet bins for abnormaly.
Consistent with SM.MET: Eg: M(j1, )g : Ht:
![Page 82: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/82.jpg)
Multijets Resonance• Model independent search for ppbarQQ3j+3j.• 6 jets with Et>15 GeV, |h|<2.5.• QCD background parameterized with 5 jet events.
• Separate 3-jet combinations that are potentially correlated using diagonal cut.
• Optimize cut for each point.• Set limit for RPV gluino scenario:
Mass below 144 GeV/c2 excluded.
![Page 83: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/83.jpg)
Search for b’• Assume br(b’tW)=100%.• Search for : • 1 e/m with Pt>20 GeV, |h|<1.1.• MET>20 GeV.
Jet Multiplicity:Cross section Limit:
Mb’ > 372 GeV/c2 (95% C.L.)
Mb’ =350 GeV
![Page 84: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/84.jpg)
Search for t’• t’t’WqWq(ln)q(qq)ql+4jets.• 1 e/m with Pt>25 GeV, |h|<1.1.• MET>20 GeV.• 4 jets with Et>20 GeV, |h|<2.0.
Limit on Cross Section:
Reconstructed t’ mass:
Mt’ > 335 GeV (95% C.L.)
Mt’ = 400 GeV
![Page 85: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/85.jpg)
Summary (1)• Tevatron is running smoothly.
– Integrated delivered luminosity: 10.4 fb-1
– Will be terminated at the end of September, 2011.• Dijet invariant mass anomaly in W+2jets events
– D0 didn’t see the same excess.– Careful investigation ongoing.
• Top Physics– Mass measurement at 0.6% precision.
• mH < 158 GeV @ 95% CL.– Interesting deviation from SM in ttbar forward-backward
asymmetry:• >2s deviation from SM in L+jets and dilepton analyses at
CDF.• >3s deviation in high Mttbar region in L+jets.• This analysis is unique to ppbar initial state. Cannot
reproduce in LHC.
![Page 86: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/86.jpg)
• Higgs Search– SM Higgs Mass Region 158<Mh<175 GeV excluded (95% C.L.)– Main channels have very elaborate analyses.– Fierce competition expected with LHC experiments during
Summer 2011.• Exotic Physics Searches
– A wide variety of interesting search analyses.– So far, consistent with SM.
• B Physics– We have very interesting B physics program ongoing.
• CDF and D0 keep working hard to produce interesting physics results!!
Summary (2)
![Page 87: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/87.jpg)
Backup
![Page 88: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/88.jpg)
![Page 90: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/90.jpg)
AFB in L+jets by Lepton Type
Prediction
![Page 91: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/91.jpg)
AFB by Fine Mass Bins
![Page 92: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/92.jpg)
• Prediction:
• Data
AFB by Fine Jet Bins
![Page 93: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/93.jpg)
AFB in Dilepton By Lepton Type at CDF
![Page 94: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/94.jpg)
W Mass Syst. Uncertainty
![Page 95: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/95.jpg)
MTM3 Top Mass Measurement
log Lsig(mt, JES) = Σi[log Li(mt, JES) - fbg(qi) log Lavg(mt, JES | background)]
![Page 96: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/96.jpg)
SM combined channels
![Page 97: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/97.jpg)
MSSM f tt Tevatron Combination
![Page 98: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/98.jpg)
MSSM fbbbb at CDF
![Page 99: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/99.jpg)
Tevatronの今後
2011年末MH<200 GeVの全質量領域で 2.4σ
発見に必要なルミノシティの予想値:
2014年末100<MH<180 GeVの質量領域で”>3σ Evidence”
Tevatronは 2014年までの実験延長を模索している(LHCとの兼ね合い)。
![Page 100: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/100.jpg)
7 TeVでのATLASの棄却能力
• 3 探索モードのみの合成:– H→WW→lνlν– H→ZZ→4l– H→γγ
• 1fb -1( 2011 年末に相当)のデータ量で、 135-188 GeVのヒッグス質量を棄却することができる。
![Page 101: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/101.jpg)
2011年の状況
×1.3
リミットが√ Lumでスケールするならば、2011年の Tevatronは、√ (10fb-1/5.9fb-1)~1.3だけリミットを下げる。⇒ 上の赤線を跨ぐところが 2011年の質量棄却領域になる。⇒ 142- 184 GeVの領域を棄却できる。
ATLASは、 2011年に 135-188 GeVのヒッグス質量を棄却できる。それまでに検出器の校正・理解は十分できるか?解析手法はスムーズに確立できるか?CMSとの足し合わせはすぐにできるか?
![Page 102: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/102.jpg)
BsBsOscillation Motivation
from Dmd
from Dmd/DmsLower limit on Dms
md~|Vtd |2 (BdBd Oscillation)
constrains a side of unitarity triangle.
By taking ratio md / ms we can rule out theoretical uncertainties and tighten the constraint on unitarity triangle.
Orange band in the plot: the upper limit on |Vtd| is set by the lower limit of ms.
)cos1(2
1)(prob 00 tmeBB s
tss
Frequency ms~|Vts |2
![Page 103: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/103.jpg)
BsBsOscillation Result (355 pb-1)• Oscillation not yet observed.• Frequency scan of the oscillation:
– Fit for A for each ms.– A=1 for true ms.
• Results will be updated very soon!– With double data (765 pb-1).– Newly developed same-side kaon
flavor tagging will improve eD2 by a factor of ~3!!
– Overall eD2=1.6% in current analyses.
ms > 8.6 ps-1 (95% CL limit)
Frequency scan, semileptonic andhadronic channels combined :
![Page 104: CDF 実験の最新結果](https://reader036.vdocuments.net/reader036/viewer/2022062309/5681457b550346895db24d07/html5/thumbnails/104.jpg)
CP in
3.2 +/- 1.4%