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-
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!!!