1 Beate Heinemann University of California, Berkeley and Lawrence Berkeley National Laboratory...

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1 Beate Heinemann Beate Heinemann University of California, Berkeley and Lawrence Berkeley National Laboratory University of California, Berkeley and Lawrence Berkeley National Laboratory Aspen, February 14th 2009 Aspen, February 14th 2009 Aspen 2009: Experimental View on “Physics in the LHC Era” QuickTime™ and a decompressor are needed to see this picture.

Transcript of 1 Beate Heinemann University of California, Berkeley and Lawrence Berkeley National Laboratory...

Page 1: 1 Beate Heinemann University of California, Berkeley and Lawrence Berkeley National Laboratory Aspen, February 14th 2009 Aspen 2009: Experimental View.

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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

M. Eads

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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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T. Browder

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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!