rencontres de blois, 30.5 –3.6lss.fnal.gov/conf2/c110529/lykken.pdf · bigchanges in particle...
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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