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Beate HeinemannBeate HeinemannUniversity of California, Berkeley and Lawrence Berkeley National LaboratoryUniversity of California, Berkeley and Lawrence Berkeley National Laboratory
Aspen, February 14th 2009Aspen, February 14th 2009
Aspen 2009: Experimental View on“Physics in the LHC Era”
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Outline
Experimental Status of the Standard Model
• Strong Force
• Flavor Sector
• Electroweak Symmetry Breaking
• Searches for the Unknown
The beginning of the new Era
• The Large Hadron Collider and it’s Experiments
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Rock solid?
Standard Model
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Not really!
Standard Model
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Mass hierarchyMass hierarchy
EWSBEWSB
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Dark Matter+Energy
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TevatronTevatron
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Pam
ela
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Standard Model
Attack #1: QCD
Attack #3: electroweakSymmetry breaking
Attack #2: flavour sector
Attack #4:new physics searches
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The Strong Force
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Jet Cross Section
Impressive measurements at Tevatron• Data agree with NLO QCD over 8 order of magnitude
Early physics opportunity at LHC• Already surpass Tevatron with 10 pb-1!
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M. MartinezM. Dunford
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Gluon Density
New comprehensive analysis by Martin, Stirling, Thorne, Watt (MSTW): arXiv:0901.0002• Gluon reduced at high x due to Run2 Tevatron data• Reduces e.g. H->WW cross section at Tevatron by ~15%
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M. Martinez
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Very early LHC Measurements
Skands:• LHC: N=12.5+/-1.5
• for pT>0.5 and |eta|<2.5
• CDF: N=3.17+/- 0.31• for pT>0.5 and |eta|<1.0
Critical for tuning MC• MinBias interactions• Underlying event
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P. SkandsM. Dunford
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Top Production
Top production consistent with QCD calculations• Theoretical and experimental
precision comparable
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Z. Ye
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Top Production at LHC
Factor 100 increase in cross section• Backgrounds increase less: better S/B
Establish top with 10-100 pb-1
• Important milestone on road to new physics discoveries
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10 pb10 pb-1-1
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A. Arce
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Tests of Lattice QCD
Impressive precision: lattice tested to ~1% in many cases New measurements of fD and fDs by CLEO-c
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I. Shipsey
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Flavor Physics
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Unitarity Triangle
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New result by BaBar for angle from B++0
• =92.4+6.0-6.5 degrees (7% precision!)
New result by Belle for angle from J/K0s
• sin2=0.642 +/- 0.031 (stat) +/-0.017 (syst)• Still statistically limited!
The triangle closes perfectly!
M. Graham
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Direct Measurement of Vtb
Awaiting 5sigma discovery of single top production• Vtb consistent with 1.0• Similar precision expected from LHC with 1 fb-1
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Z. Ye
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CP violation in Bs system
Predicted to be tiny in SM• CDF and D0 both see non-0
value at 2 level in J/ angular analysis
• Combined: 2.7• Eagerly awaiting updates
from both experiments
• LHCb will measure SM angle with 10 fb-1 at 3 from 0
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R.JesikM.N.Minard
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Neutrino Mixing
Consistent picture of neutrino oscillations from solar, atmospheric, long baseline and reactor experiments
New generation of experiments about to come online:• Long baseline: T2K (now) and NoVA (later)• Reactor: Double-Chooz, Daya Bay and Reno
Sensitive to sin2213≈0.01• Order of magnitude better than current limits
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L. Winslow
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Electroweak Symmetry Breaking
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Tevatron W Mass Measurement
Expected precision for Run 2: ~14 MeV (current world: 25 MeV)• Relies on reduction of e.g. PDF uncertainties• Important: W charge asymmetry measurements from CDF and D0
• Can also be made at LHC with ~100 pb-1
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P. MuratN. Neumeister
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W’s at the LHC
Record ~6,000 W’s/pb-1 per decay channel at 10 TeV• Early cross section measurement with ~5% precision
W mass competitive with Tevatron with ~10 fb-1
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N. Neumeister
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Top Quark Mass
New CDF measurement reported using template method• All measurements agree
Uncertainty only 1.2 GeV LHC competitive with ~1 fb-1
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Z. YeA. Arce
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Electroweak Precision Data
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J. Erler
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SM Higgs Searches
Tevatron and LHC searches• Low mass:
• Tevatron: W/Z+H(bb)• LHC: ggH , VBF H
• High mass:• Tevatron HWW*• LHC: HWW*, HZZ*
Complementary search channels
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J. PursleyL. ZivkovicJ. Wang
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Evidence for WW/WZ ->lvjj
Dijet resonance seen in W+2jets (4.6sigma)• Important milestone on the road to the Higgs
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P. Murat
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Tevatron Higgs Searches
Limits are factor 2-5 above SM cross section
Future:• 95% exclusion up to 190 GeV
• If it’s not there
• 3 evidence at high mass possible• And with luck maybe at low mass
• 5 very very difficult
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L. Zivkovic
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High Mass Higgs Boson
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J. Pursley
Expect news for Moriond: more data and updated theory!
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Higgs Search at LHC
Requires ∫Ldt = 1-30 fb-1 depending on mass for 5 discovery• 2 achieved over full mass range with 2-4 fb-1 (maybe 2012?)
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J. Weng
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Searching for the Unknown
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Supersymmetry
Searches at Tevatron ongoing in many final states Vast discovery potential at LHC!
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J. BoydM. Eads
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Latest Hints from Space
Lot’s of theoretical work on understanding if ATIC/Pamela are signal for dark matter• New experimental signatures at colliders proposed
• Large cross section and clean signatures!
• More data expected soon to clarify situation further
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Tevatron SUSY Searches
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Nothing found yet
M. Eads
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SUSY Limits
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Limits set both in physical masses and in GUT scale parameters
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LHC SUSY Discovery Potential
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Excellent discovery potential• Cross sections >1,000 times the Tevatron• Discovery could be fast (2010/11?)
• Background understanding critical
J. Boyd
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Rare Decays: B
New result from Belle: (1.65+0.52)x10-4
• About 1 higher than SM Severely constrains mass of H± at high
tan• Far beyond direct limits from
Tevatron and LEP
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C. Wagner
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A very light pseudo-scalar Higgs: a0
New searches by BaBar at Y(3S) and Cleo at Y(1S):• Ya0 • No signals found and severe
constraints set
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CLEOCLEO
J. G
unio
n et
al.
K. FloodI. Shipsey
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Beyond SUSY
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Many Other Possibilities…
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T. TaitT. Tait
J. ThalerJ. Thaler
C. CsakiC. Csaki
N. WeinerN. WeinerT. PlehnT. Plehn M. NeubertM. Neubert
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New Physics in Top?
Searches for• Resonances• Heavier partners (t’)• Rare decays
No evidence for BSM yet• LHC will probe with high
precision
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Z. YeA. Arce
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Dilepton Resonances
Tevatron mass limits up to 1 TeV (for SSM Z’)• Depending on couplings of course
LHC will probe 1 TeV with ~50 pb-1
• 2 TeV with ~200 pb-1
Many other searches ongoing and planned
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S. PrankoB. Clerbaux
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Some cracks in the Standard Model but
no smoking gun yet
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The Beginning of the Future: LHC startup in Sepember
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September 10-12th 2008
First beam circulation broadcasted live on TV worldwide Worked very well: accomplished within <1h
• Beam captured soon after
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R. Bailey
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LHC incident and planR. Bailey
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LHC repair ongoing New schedule: run from Nov. 2009-Oct. 2010 at 10 TeV
• Accumulate 200 pb-1 for experiments
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First Beams in Experiments
Used by collaborations for calibration:• particularly for timing of subdetectors
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P. KriegerM. Chamizo LlatasR. Jacobsson
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Cosmics in ATLAS and CMS
After incident running cosmics Impressive performance achieved:
• Much better prepared for LHC beam next time
• Physics will come much faster!
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J. DubbertK. Maeshima
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Standard Model after next experimental attacks?
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Experimentalists:• Good luck that
• Your experiments will (or continue to) work• Your analyses converge quickly
Theorists• We will need your help and inspiration
• In understanding the backgrounds• In inventing and understanding the signals
Final Words
Thanks!