Rencontres de Blois, 30.5 –3.6lss.fnal.gov/conf2/C110529/lykken.pdf · bigchanges in particle...

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Highlights and Perspectives Joseph Lykken Fermilab 23rd Rencontres de Blois, 30.5 – 3.6.2011

Transcript of Rencontres de Blois, 30.5 –3.6lss.fnal.gov/conf2/C110529/lykken.pdf · bigchanges in particle...

Page 1: Rencontres de Blois, 30.5 –3.6lss.fnal.gov/conf2/C110529/lykken.pdf · bigchanges in particle physics over the nextfew years • expect manytheoriststo lose theirheads • but difficultto

Highlights and Perspectives

Joseph LykkenFermilab

23rd Rencontres de Blois, 30.5 – 3.6.2011

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• It was the best of times

• It was the worst of times

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• It was the best of times

The revolution has started

• It was the worst of times

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• It was the best of times

The revolution has started

• It was the worst of times

The revolution has started

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Vive la revolution• big changes in particle physicsover the next few years

• expect many theorists to losetheir heads

• but difficult to predict whichof the current BSM factions willprevail – maybe a new dominant figure will emergeout of nowhere

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Nostalgia for the Ancien Regime

• we knew what the theory was

• in many cases, the theory made precise predictions

• we could test and over‐constrain these predictions

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Nostalgia for the Ancien Regime

• LEP etc:  EWPT to a part in 10000 and multi‐TeVsensitivity to NP  (M. Verzocchi)

• B factories:   over‐constrained UT and multi‐TeVsensitivity to NP (A. Golutvin, T. Iijima)

• HERA: parton distributions inside the proton          (T. LeCompte)

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The Standard Model is not going away

• understood best at high energies, short distances, low temperature, low density

• much that we still need to figure out, includingnonperturbative features that are New Physics

• The LHC Era will be a QCD Era 

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Nonperturbative QCD

• vacuum structure: confinement, chiral symmbreaking, topological thingies

• new kinds of bound states: X(3872) first hadron bound state; Y(4260) first hybrid (ccg)

• many challenges for lattice gauge theory

E. Swanson

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Heavy ion physics: the Golden Age 

• New emergent physics!   (C. Salgado)

• First discoveries at LHC were in HI  (C. Loizides)

• Applied Holography!  (Y. Oz)

QGP, perfect fluid, elliptic flow, jet quenching, J/psi and upsilon quenching, …

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QCD at LHC is messy at both ends

T. LeCompte

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Standard Candles

• an essential part of the LHC discovery program, alreadypioneered at the Tevatron (Glover, Grannis, LeCompte, Maltoni, Verzocchi)

• requires a big organized effort on both the theory and experiment sides

• with expanded phase space probed by LHC, and with large integrated luminosity (Myers), this should work great

• enable both more data‐driven searches and betterdiscrimination of NP look‐alikes once you have signal

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Tevatron Standard Candles

P. Grannis, M. Verzocchi, T. LeCompte

• precision physics at a hadron collider for top, W, Z, W/Z + jets, b and tau final states

• D0 measured W mass to 5 parts in 10000, betterthan any single LEP measurement

• D0 measured weak angle more precisely than all LEP experiments combined

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Tevatron Standard Candles

N. Glover

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LHC Standard Candles:  top

F. MaltoniM. Narain

Large cross section at LHC‐7:  150 pb for ttbar,  60 pb for single top  

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T. LeCompte

LHC Standard Candles:  Z + jets

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T. LeCompte

LHC Standard Candles:  W + jets

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Breakthroughs in pQCD

N. Glover

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LHC Standard Candles: theory

N. Glover

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The Holy Grail: automated NLO eventgenerators

N. Glover

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The Holy Grail: automated NLO eventgenerators

N. Glover

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LHC 2011‐2012 Discovery Run

O. Buchmuller, A. Taffard, R. Godbole,S. Myers

• More than 500 pb‐1 in the can already this year

• Experienced analysis teams

• Overlapping analyses for cross‐checks

• Wide variety of signature‐based searches

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LHC SUSY searches:                                      old reliables and new innovations 

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New kinematic variables for SUSY discoveryO. Buchmuller

• Inspired by theorists, both ATLAS and CMS developed new inclusive SUSY searchesimplemented in the 2010 data, based on new kinematic discriminators alpha_T, mT2, and the razor variables

• The extra information encoded in these variables can be very efficient for killing backgrounds

• Bonus: once you make a discovery, these and similar variables help tell you what you found

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Razor variables 

• Cannot fully reconstruct the kinematics of the production of a pair of heavy particles that each decay to MET + X  • R and M_R approximate this kinematics• For a given R threshold, M_R peaks for signal, is exponentiallysuppressed for QCD, EW, and instrumental backgrounds 

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Killing QCD backgrounds to SUSY 

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Razor analysis for SUSY: control samples

Moving towards searches that are more inclusive and use more data‐driven background estimates

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Anomalies and Mysteries in the Data 

• quark and charged lepton flavor puzzles

• neutrino anomalies

• Tevatron anomalies

• dark matter direct and indirect anomalies

• cosmological mysteries

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A. Lenz, FPCP2011

quark and charged lepton flavor puzzles

BNL muon g‐2 anomaly;  new g‐2 experiment at Fermilab

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What are neutrinos trying to tell us? E. Lisi, M. Lindner, S. Pascoli, C. Lunardini

• Reactor neutrino anomaly

• MiniBooNE/LSND short baseline anomaly

• MINOS long baseline anomaly

And this is probably just the beginning

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The MINOS muon neutrino/antineutrino anomalyM. Maltoni, NeuTel

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T.  Schwarz, FPCP2011

Tevatron ttbar forward‐backward asymmetryanomaly

+ D0 + CDF dileptons

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Tevatron ttbar forward‐backward asymmetryanomaly

W.  Volgelsang, FPCP 2011

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Tevatron ttbar forward‐backward asymmetryanomaly

W.  Volgelsang, FPCP 2011

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CDF Wjj anomaly (D word?)

G. Punzi

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CDF Wjj anomaly

• You say: it is the JES!   ‐‐ but you need a 15% error

• You say: it is the Monte Carlo! – but Alpgen, Sherpa, and MCFM NLO give similar results

• You say: it is top!  …

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G. Punzi

CDF Wjj anomaly

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If it is New Physics, then what is it? 

• a leptophobic Z’ (beware of UA2 dijet constraint)

• technicolor: 300 GeV techni‐rho decays to 150 GeV techni‐pion plus a W

• scalars related to flavor symmetries, expanded Higgs sector

• radion of a finite extra dimension

E. Eichten, K. Lane, A. Martin

M. Buckley, D. Hooper, J. Kopp, E. Neil;    F. YuK. Cheung, J. Song;    P. Fox et al

A. Nelson et al;  M. Carena et al;  G. Segre and B. Kayser

B. Bhattacherjee and S. Raychaudhuri

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N. Weiner, PHENO2011

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N. Weiner, PHENO2011

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N. Weiner, PHENO2011

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N. Weiner, PHENO2011

J. Gunion

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Tevatron ttbar

N. Glover

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Tevatron ttbar

N. Glover

J. Silk

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Tevatron ttbar

N. Glover

J. Silk, M. Kowalski

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Tevatron ttbar

N. Glover

J. Silk

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Tevatron ttbar

N. Glover

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Tevatron ttbarP. Binetruy

T. Montaruli

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G. Punzi

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New ideas, new frameworksR. Godbole, A. Pomarol

• The moment of truth is fast approaching for both SUSY and Higgs

• Current anomalies and non‐signals may already be hints thatwe need a major rethink of BSM physics

• There are some genuinely new ideas floating around, likeanisotropic scaling (Horava), classicalization (Gomez et al), and monopole condensation (Terning).

• BSM theory may take off in a new direction soon

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Thanks to TranThanks to Boaz

Thanks to all the organizersfor an exciting conference in exceptional surroundings