electroweak summary
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Electroweak Summary
Chris Hays, Oxford University
for the EWK/BSM session conveners:
Michael Kramer
Dave South
Filip Zarnecki
XVIXVIthth Workshop on Deep Inelastic Scattering Workshop on Deep Inelastic Scattering
London, EnglandLondon, England
April 10, 2008April 10, 2008
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April 10, 2008 Electroweak Summary, DIS 2008 2
Electroweak and Beyond-the-Standard-Model Session
• 42 talks– 17 in this summary, 25 in BSM summary
• 10 additional talks in joint sessions with HFS, SF– 4 in this summary, 6 in HFS/SF summaries
• Many new results shown– Impossible to show all, or to give those shown justice
• 420 minutes in 20 slides
– Apologies to those missed
April 10, 2008 Electroweak Summary, DIS 2008 3
The Experiments in a Nutshell
• CMS & ATLAS– Looking forward to data!
• ZEUS & H1 & NuTeV– Look at all our data!
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• CDF & DØ & NA48/62–Looking forward to more data!
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April 10, 2008 Electroweak Summary, DIS 2008 4
The Electroweak Theory
• Before symmetry breaking: SU(2)L x U(1)Y gauge symmetry
gauge termfermion term
Higgs termYukawa term
• After symmetry breaking: U(1)EM gauge symmetry
kinetic
neutral currentcharged current
Trilinear gauge interaction
Higgs
Higgs-gauge interaction
Quartic gauge interaction
Yukawa
April 10, 2008 Electroweak Summary, DIS 2008 5
Trilinear Gauge Couplings
• Probe WW vertex with W production at the Tevatron
• t- and u-channels dominate cross section– How do you see the s-channel?
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2.6 “dip” significance
Interference effects
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Compare data to non-SM trilinear-gauge-coupling predictions
Y. Maravin’s talk
arXiv:0803.0030
April 10, 2008 Electroweak Summary, DIS 2008 6
Trilinear Gauge Couplings
• Tevatron only place to separately probe WWZ and WW vertices
• CDF has observed WZ production at the 6 level
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D. Waters’ talk
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PRL 98, 161801PRD 76, 111104(R)
April 10, 2008 Electroweak Summary, DIS 2008 7
Trilinear Gauge Couplings
• No neutral trilinear couplings in the SM– Tevatron experiments test this prediction with measurements
of Z and ZZ production
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QuickTime™ and aTIFF (LZW) decompressor
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arXiv:0712.0599
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D. Waters’ talkarXiv:0801.4806
CDF: first measurement of ZZ production
4.4 significance
April 10, 2008 Electroweak Summary, DIS 2008 8
Neutral Current
• HERA can probe electron and quark neutral current couplings
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ZEUS: New measurements ofquark couplings with global fit
K. Nagano’s talk
April 10, 2008 Electroweak Summary, DIS 2008 9
Neutral and Charged Currents
• NuTeV extracts sin2W using ratio of NC to CC:
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Update with fit of s/s asymmetry, K+
e3 BR, d/u PDF uncertainties
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Additional effects still to be included:EWK PDF corrections, mc, ...
K. McFarland's talk
April 10, 2008 Electroweak Summary, DIS 2008 10
Charged Current
• NA48/62 at CERN tests universality of e and CC couplingsQuickTime™ and a
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trigger dominatedbackground dominated
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Analysis progressing with 2007 data:use data to constrain → e backgrounds
E. Goudzovski's talk
Preparing for 2011 run to measure BR(K± → ±):QuickTime™ and aTIFF (LZW) decompressor
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April 10, 2008 Electroweak Summary, DIS 2008 11
Charged Current
• HERA probes V-A structure of the charged current with polarized electron beam
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K. Nagano’s talk
April 10, 2008 Electroweak Summary, DIS 2008 12
Charged Current
• Tevatron probes Wtb vertex by measuring W helicity
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C. Potter’s talk
April 10, 2008 Electroweak Summary, DIS 2008 13
Charged Current
• Tevatron directly constrains Vtb with single top production
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CDF: t+s = 2.2 ± 0.7 pb (3.7 significance), |Vtb| > 0.66
DØ: t+s = 4.7 ± 1.3 pb (3.6 significance), |Vtb| > 0.68D. Hirschbühl’s talk
LHC: |Vtb| to 5% with 10 fb-1 R. Hawkings' talk
April 10, 2008 Electroweak Summary, DIS 2008 14
Yukawa Couplings
• Top Yukawa coupling suspiciously close to 1– CDF & DØ have updated their measurements with 2 fb-1
P. Mehtälä's talk
LHC: mt to 1 GeV with 1 fb-1
N. Besson's talk
April 10, 2008 Electroweak Summary, DIS 2008 15
Yukawa Couplings
• Independently determine top mass from production cross section
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mt = 170 ± 7 GeVD. Cho's talk
April 10, 2008 Electroweak Summary, DIS 2008 16
Kinetic Terms
• Indirectly constrain Higgs mass using Electroweak parameters– Higgs loop corrections to the W mass
New top mass improves consistency with SM mH = 87+36
-27 GeV, mH < 160 (190) GeV
Assuming mt ~ 1 GeV and mW ~ 10 MeV (LHC projections)
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N. Besson's talk
April 10, 2008 Electroweak Summary, DIS 2008 17
Kinetic Terms
• Higgs searches heating up at the Tevatron– Low-mass searches focus on WH, ZH, with H → bb; New: VBF H →
– High-mass searches focus on H → WW
WH ZHVBF H
B. Tuchming's talk
D. Hidas' talk
April 10, 2008 Electroweak Summary, DIS 2008 18
Kinetic Terms
• LHC experiments have determined combined Higgs sensitivity
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D. Fortin's talk
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Discovery
Exclusion
April 10, 2008 Electroweak Summary, DIS 2008 19
The Experiments Revisited
• CMS & ATLAS– Wish we had collision data…
• ZEUS & H1 & NuTeV– Too bad we won’t get any more data…
• CDF & DØ & NA 48/62–Will we get enough data?
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April 10, 2008 Electroweak Summary, DIS 2008 20
Summary
• New results test Electroweak theory at unprecedented level
• Input parameters growing ever more precise
• Rapidly approaching the last piece of the Electroweak puzzle:
The Higgs Boson
“Well, either we’ve found the Higgs boson, or Fred’s just put the kettle on.”
April 10, 2008 Electroweak Summary, DIS 2008 21
Backup
April 10, 2008 Electroweak Summary, DIS 2008 22
Tevatron Higgs Sensitivity
• Recent improvements and projections
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