summary of moriond 2010 part i. tevatron

Summary of Moriond 2010

Part I. Tevatron

이강영 ( 건국대학교 )

@ 연세대학교 2010. 4. 26.

Rencontres de Moriond Since 1966

La Thuile, Aosta valley, Italy

Jean Tran Thanh Van

• Theorists and experimentalists are brought together in a pleasant, relaxed and intimate atmosphere.

• 75 ordinary talks + 2 summary talks• 32 Young Scientist Forum• Ordinary talks of 15-30 min. are on

invitation.• Young scientist forum talks are 7 min

and only one question is allowed.

• Tevatron results

• LHC prospects (+a little results)

• Neutrinos

• And others including theory, flavour, dark matter, etc.

Electroweak session

Theoretical Issues on Higgs Productionat Tevatron

Experimental Results on Higgs

Physics at Tevatron

Dr. Richard St. Denis Glasgow University

On behalf of the CDF and D0 CollaborationsMoriond 2010 Electroweak, La Thuile, Italy

March 6-March 13, 2010

Tevatron Results on SM Higgs Search in the High Mass Region

● Search Foundation and Higgs detection modes

● CDF and D0 detection methods in High Mass● Results, implications, next steps

Outline

Higher Physics Reach

Jets

Bottom

WZ

Top (t)

Higgs

ms=17.77 ± 0.10 ±

0.07

Susy

Build on mountain of measurements

WW,WZ,ZZ

Top(ttbar)

Single Top

ZZ

WZ

Mt

hadronicNew

Mw

SM Higgs Production and

Decay

• Trigger: 1 High Pt e or • Focus on Decays: WW →

ee, e, e’s• Separate channels by

dileptons (D0), Njets (CDF)

• Event Selection: High Pt Leptons, Missing ET

Vector Boson Fusion

Associated production

Gluon Fusion

(dominates)

Low MassLow Mass High MassHigh Mass

HWW Production Features

• High Pt Leptons not back to back

• Spin 0 Higgs correlates spins of leptons: charged leptons (low ll), two neutrinos (High MET) tend to be closely aligned with one another.

g

gH0

W+

W-

e-

+

e

ll

ww

Z/

ll

Backgrounds

H

WW

Heavy Flavor

WW/W/top H-Enhanced

HWW

Met,Mll

H

t

B

Z/

WW

t

H

High Pt e,

DrellYan

0jet

1Jet

>1Jet t H

R,Ht…

Discr. Ana

H

WW

Z/

Hi

Lo

Mll

<2Jet HWH

W

(CDF)

WW

Z/

t

H

HZ/WW

Isolation

Same sign Dileptons(CDF/D0), Trileptons(CDF)

H0

W+ l+l

W+

W+

W-

q

q

l+

l

l

l-

H0

l+

W+

W-

q

ql

l-Z0

Z0

l-

qq

No Rate? Too Low? No! New

● Same Sign dileptons:● WH: W(jj)W*(ln)W(ln),

ll(l) nnn● ZH: Z(jj)llnn,W(jj)ll(l) nn,

…● Trileptons:

● WH:lllnnn● ZH:Z(ll)W(qq)W(l) n

q

q

No Channel Left Behind

Different Channel Different

Systematics

SM Exclusion: 162-166 GeV/c2!

+

T. Aaltonen et al., (CDF and DØ Collaborations), Phys. Rev. Lett. 104, 061802 (2010).

T. Aaltonen et al. (CDF Collaboration), Phys. Rev. Lett. 104, 061803 (2010).

V. M. Abazov et al. (DØ Collaboration), Phys. Rev. Lett. 104, 061804 (2010).

arXiv: 1001.4468

arXiv:1001.4481

arXiv: 1001.4162.

SM Sensitivity: 159-169 GeV/c2!

@165: Expected

1.20Observed

1.29

@165: Expected

1.36Observed1.55

CDF 4.8 fb-1

Improvements Over Publication

● 4.8→5.3 fb-1: 5% better

● Optimized e- selection● Add Trileptons, Low

Mll , VH, VBF for 0 Jet

● All together: 15% better!

● Improvements continue (t modes add a few %)

New

For MH=165 GeV/c2

Expected

Observed

CDF New 1.03 1.13

CDF Pub 1.20 1.29

Next:Extend sensitivity

146-183

136-190

Summary• “No channel too small” strategy successful: different,

backgrounds, systematics, S/B and many channels.

• Combined Tevatron results exclude the Standard Model Higgs at 95% CL for 162≤ MH ≤ 166 GeV/c2.

• Updated CDF results: sensitivity close to 95% CL exclusion for MH=160-165 GeV/c2.

• The High mass sensitivity will be expanded: 2xCDF gives 146-183 GeV/c2 if no improvements, 136-190 GeV/c2 with improvements.

• Both experiments have 8 fb-1 delivered!

• These are remarkable times. Rapid changes in data collected and analysis continue.

Tevatron Searches for New Physics

Top Quark at the Tevatron

Summary

• Tevatron is still working!

• Many interesting results have been and will be reported from Tevatron.

• Can the SM Higgs be found? Well…

• Please consider (and imagine) exotic new physics to be examined at Tevatron!!!