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
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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
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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
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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)
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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.”
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April 10, 2008 Electroweak Summary, DIS 2008 21
Backup
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April 10, 2008 Electroweak Summary, DIS 2008 22
Tevatron Higgs Sensitivity
• Recent improvements and projections
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