Highlights from Top Quark Physics Suyong Choi Korea

Highlights from Top Quark Physics Suyong Choi Korea University 1

• • Introduction Measurement of Production Cross Sections Properties of the Top Quark Summary and Outlook Contents 2

CDF DØ DØ Top Quark Runfrom 2 results Top Mass Distributions 1995 observation paper 3

Success of the SM 4

• The Top Quark 5

5 fb-1 @ 7 Te. V 20 fb-1 @ 8 Te. V LHC and Experiments 6

• Properties • • Mass Decay width Spin Coupling • Cross section measurements • Production and decays Physics with Top Quarks 7

• Higher cross section and higher luminosity at LHC • Top quark factory • Rare processes with top quarks • New physics with top quarks • Tevatron and LHC are complementary Cross Sections at Tevatron and LHC 8

PRODUCTION 9

Pair production diagams • 10

Dilepton: ee, e�, �� tau+X Multijet mu+jets e+jets Lepton+jets 11

• Experimental error comparable to theory error • QCD explains well the inclusive pair production Pair Production Cross Section 12

• Lepton Forward-Backward Asymmetry 13

Channel Luminosity CDF Lepton+jets 9. 4 fb-1 D 0 Lepton+jets 9. 7 fb-1 D 0 Dilepton 9. 7 fb-1 14

s and t channel • W associated Single Top Production 15

Single Top Production t-channel 16

Signal Region Control Region Observation of Wt Single Top Production 17

PROPERTIES 19

• Mass of Top Quark 20

• Decay Width of Top Quark 22

• Electric Charge of Top Quark 23

• W from top decays are either left-handed or longitudinal W Polarization from Top 24

• Spin Correlation 25

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• Approaching 20 years of rich physics program at hadron colliders with top quark events • Top quark production and properties consistent with SM • Many measurements systematics limited. What can you do with millions of top quark events? Summary and Outlook 28

• Introduction 29

• Strong Coupling Constant 30

SEARCHES WITH TOP QUARKS 31

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Anomalous Single Top • Search for FCNC 33

• Top-Higgs coupling almost 1 • Consistent with backgrounds • Cross section limits at 34