32nd International Conference on High Energy Physics

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32nd International Conference on High Energy
Physics

• (ICHEP04)
• Beijing, August 16-22, 2004
• http//ichep04.ihep.ac.cn

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Conference statistics
More than 800 participants
About 300 session talks, 25 plenary talks and 1
concluding talk (J.Ellis)
Hadron Spectroscopy exotics
7.5 hours QCD soft interactions
7.5 hours QCD hard interactions
8.5 hours Quark matter
heavy ion collisions 5 hours CP Violation
,Rare Kaon Decay CKM 9.5 hours Heavy quark
mesons baryons (including top) 11
hours Electroweak Physics
9 hours Neutrino Masses mixings
7 hours Particle astrophysics
cosmology 4.5 hours Beyond the
standard model 9.5 hours
String theory 2
hours Computational quantum field theory 2
hours Future accelerators detectors 5
hours
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JINR participation
V.G. Kadyshevsky, A.N. Tavkhelidze A.N. Sissakian
Thermalized states V.D. Kekelidze NA48/2 results
on charged K decays L. Litov Neutral K decays
from NA48 and NA48/1 I.A. Savin Recent results
on Polarized Quark and Gluon Distributions at
COMPASS G.A. Kozlov Deconfined Phase via
Multi-particle Correlations E.A. Kuraev
Computation of radiative corrections with
structure function method M.V. Kapishin
Inclusive diffraction at HERA A.E. Dorokhov
Adler function and hadronic contribution to the
muon g-2 in a nonlocal chiral quark model S.
Vokal STAR collaboration
ITEP (Moscow), BNPI (Novosibirsk), IHEP
(Protvino)
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JINR IHEP agreement
Institute of High Energy Physics Chinese Academy
of Sciences

• Comprehensive and largest fundamental research
  center in China
• For
• Particle physics
• Accelerator technologies and applications
• Synchrotron radiation technologies and
  applications
• 1000 employers, 650 physicists and engineers,
• 300 PhD Students and postdoctors
• Established at 1950, and became an independent
  institute at 1973 .

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Worlds largest J/y and y? data sample (106)
J/?
? ?
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BESIII Expected Physics Results

• Because luminosity increase by two-orders of
  magnitude, BES III can obtain many important
  results in tau-charm physics.
• Some expected results
• Precise measure CKM parameters
• Precise R measurement
• Search for glueballs and exotic states,
  determine spin and parity

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QCD Works!
_at_ Tevatron
Lucchesi
b production
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Stirling
World Summary of aS(MZ) July 2004
Bethke , hep-ex/0407021
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NNLO pQCDCalculations
Stirling
Parton splitting functions
7 pages! Moch, Vermaseren Vogt
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QCD Calculations in String Approach
Stirling
Cachazo, Svrcek Witten

• Maximal helicity-violating (MHV) amplitudes as
  effective vertices in a new scalar graph approach
• use them with scalar propagators to calculate
• tree-level non-MHV amplitudes
• with both quarks and gluons
• and loop diagrams!
• dramatic simplification compact
• output in terms of familiar spinor
• products
• phenomenology? multijet cross sections at LHC,
  etc. underway

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NLO QCD Calculations Needed for Extracting BSM
signals
Stirling
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Questions on Hadron Spectroscopy

• Do (which) pentaquarks exist?
• Do other exotic hadrons exist?
• What are the quark descriptions of the DsJ(2317)
  and DsJ(2460)?
• Does the DsJ(2632) exist (SELEX)?
• What is the quark description of the X(3872)?
• Interpretation of threshold reported states?
• Fate of 12 rule in ? decay (BES)?

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Jin
Some Sightings of the T(1530)
but many negative searches
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Summary of Positive Results
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Inconsistencies in M? and G??
Jin
(LEPS)
M(nK)? M(pKs)?
Also width of ?(1540) - Two positive
experiments HERMES G? 17? 9 ? 2 MeV ZEUS
G? 8 ? 4 MeV KN PWA indicates G? lt 1 MeV
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Summary of Negative Results
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How Significant are Negative Results?
Jin

• Compare with production of other baryons
  resonances
• ?(1520) may not be most reliable guide
• Most positive results at lower energies
• Different production mechanisms for exotic
  baryons?

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Interpretations of ?(1530) if it exists
Close

• Naïve non-relativistic quark model would need
  epicycles
• di/triquarks, P-wave ground state
• Predicted in chiral soliton model
• fits data, predicts other exotic states
• Existence requires confirmation
• a high-statistics, -significance experiment
• If it exists, ? spin parity distinguish models

? Based on idea that quarks weigh ltlt ?QCD
The stakes are high the ?(?, ?c) may take us
beyond the naïve quark model
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Inconsistencies (I)

• Width of T(1540)
• Two positive experiments
• HERMES GT 17? 9 ? 2 MeV
• ZEUS GT 8 ? 4 MeV
• KN PWA results indicates GT lt 1 MeV
• Mass of T(1540)

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Inconsistencies (II)

• Production rate (e.g. for T(1540) )
• Positive experiments
• SAPHIR R?(1520) 0.3
• HERMES R?(1520) 1.63.5
• ZEUS R?(1520) 0.2 ( I
  estimated from R? 0.04 )
• SVD-2 R?(1520) gt 0.2 (
  estimated by SPHINX,
• 
  
  hep-ex/0407026)
• Negative experiments
• ALEPH R?(1520) lt 0.1
• BaBar R?(1520) lt 0.01
  Belle lt0.02
• HERA-B R?(1520) lt 0.0270.16
• SPHINX R?(1520) lt 0.02

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X(3872 ) Charmonium or D0D0 Molecular State?
Jin
at 90 C.L.
y?ppJ/y
Belle, also CDF, D0
X(3872) 10seffect
No D0D0 ? unnatural spin-parity
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First observed by Belle Experiments in
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Hadronic Threshold States
Jin
also p?, p?c, K?, pp,p?
Quark description inadequate need hadronic
description? molecules, ?
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Electroweak Physics
Teubert
Low Energy vs High Energy
NuTeV EW corrections - 1s? Strange sea -
1s? ubar ? dbar - 1s? (NOMAD)
APV, E158 compatible with expected running of
a(Q2)
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Denisov
Top-Quark Mass Run 1 Revisited
new
D0 improved Run 1 value
Implications for fit to Higgs mass
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Teubert
The Blue Band Plot
Global electroweak fit high Q2 data
Since Aachen EPS Summer 2003 new top mass
increases mH by 20 GeV new 2-loop terms etc.
increase mH by 6 GeV
new
BES et al
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How Good is the Global Electroweak Fit?
Teubert
Pulls on Global Fit
Higgs mass from individual measurements
Direct search limit
Heavy flavours ? leptons, mW
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gµ - 2 ee- Data vs t Data
Largest contributions, errors from low energies
zoom
zoom
KLOE agrees with CMD-2 discard t data
Teubert
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Updated Results for gµ - 2
Weak contribution a?weak
(15.4 0.3) ? 10 10 Hadronic
contribution from higher order a?had (?
/?)3 (10.0 0.6) ? 10 10 Hadronic
contribution from LBL scattering a?had LBL
(12.0 3.5) ? 10 10
BNL E821 (2004) a?exp (11 659 208.0 ? 5.8)
10?10
not yet published
not yet published
preliminary
Teubert
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Why Do We Need to Know it so Precisely?
Experimental progress on precision of (g 2)?
Outperforms theory pre-cision on hadronic
contribution
BNL (2004)
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Improved Determination of the Hadronic
Contribution to (g 2)? and ? (MZ )
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Eidelman-Jegerlehner95, Z.Phys. C67 (1995) 585

• Since 1995, improved determi-nation of the
  dispersion integral
• better data
• extended use of QCD

• Inclusion of precise ? data using SU(2) (CVC)

Alemany-Davier-Höcker97, Narison01,
Trocóniz-Ynduráin01, later works

• Extended use of (dominantly) perturbative QCD

Martin-Zeppenfeld95, Davier-Höcker97,
Kühn-Steinhauser98, Erler98, others
Improvement in 4 Steps

• Theoretical constraints from QCD sum rules and
  use of Adler function

Groote-Körner-Schilcher-Nasrallah98,
Davier-Höcker98, Martin-Outhwaite-Ryskin00,
Cvetic-Lee-Schmidt01, Jegerlehner et al00,
Dorokhov04 others

• Better data for the ee ? ? ? cross section

(!)
CMD-202, KLOE04
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Flavour Physics Some Questions

• Are the data on quark mixing described by the CKM
  model?
• Are there signatures of physics beyond the SM?
• If not, why is new physics flavour-blind?
• Why is neutrino mixing so different from quark
  mixing?
• Can they be related?

Sakai, Ali, Giorgi, Ligeti, Patera, Shipsey,
Langacker, McGrew, Wang
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New Determinations of Vus
Patera, Kekelidze
Vus x f(0)

• PDG02

CKM unitarity crisis has disappeared
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Sakai, Ali, Giorgi, Ligeti
Global CKM Fit
Matrix elements from lattice Hashimoto
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Compare sin2? s-Penguin Results
fK0 has moved towards SM ? Ks at 2.6? from
sin2?cc lts-penguinsgt at 3.5? from sin2?cc
BUT expect corrections to sin2?cc for many
modes
Sakai, Ali, Giorgi, Ligeti
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Measuring a with B? pp, ?p and ?? Decays
12 - 10
100
Excellent agreement with global CKM fit
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CP Violation in B0 ? K p-
First evidence for direct CPV in B decays
Sakai, Ali, Giorgi, Ligeti
Discrepancy with ACP(Kp0 ) 0.04 ? 0.05 ? 0.02
? Electroweak penguins? NP? Final-state
interactions?
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Putting all the Information Together
Is there room for NP?
Sakai, Ali, Giorgi, Ligeti
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Rare KDecays
Patera
Bounds prospects for KL ? p0??
More handles on triangle
KS ? p0l l-, p0?? important for KL ? p0l l-
(NA48)
Results prospects for K ? p??
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Dunlop
QCD phase diagram
Hadron gas
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Dunlop
Particle Production Ratios
Well described by simple thermodynamic model, T
lattice
but could these just be phase space and
statistics?
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Dunlop
Elliptic Flow the Shape of the Interaction
Region at RHIC
Shape parameter v2
Reproduced well by hydrodynamic model
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Hadron Elliptic Flows Scale with Quark Number
Dunlop
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Dunlop
Jet Quenching _at_ RHIC
due to parton energy loss in QGP?
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Dunlop
The State of Heavy-Ion Theory

• A patchwork, with model parameters adjusted
  independently for different observables.
• Statistical equilibriation or phase space?
• Hydrodynamical model EOS vs realistic
  quark-gluon calculations?
• Source size as measured by HBT?
• Parton energy loss promising development!
• Watch out for J/? suppression!
• For compelling QGP claim, need quantitative
  estimates of theoretical uncertainties

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Neutrino Masses Oscillations

• First confirmed physics beyond SM
• LSND? Waiting for MiniBooNE
• (Near) bimaximal mixing ? quarks
• Is there a relation ???c p/4? Reactors for
  ?13?
• Dirac or Majorana masses seesaw?
• Normal or inverted hierarchy? ßß0??
• Holy Grail CP violation via phase d?
• Indirect relation to cosmology via
  baryogenesis?
• Search for violation of charged lepton numbers

Langacker
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L/E Significance
Evidence for Neutrino Oscillation Pattern from
Super-Kamiokande KamLAND
??2 (neutrino decay oscillation) 11.4 ? 3.4
s ??2 (neutrino decoherence oscn) 14.6 ?
3.8 s
The dips in the data cannot be explained by
other models
Wang
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KamLAND consistent with SK/SNO
sin2q is determined by SK/SNO
KamLAND
SK/SNO
Wang
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K2K confirms Super-Kamiokande
agree with SK azimuthal distributions and L/E
analysis
K2K Rate suppression and spectral distortion
McGrew, Wang
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Summary of the Summary

• QCD ever more quantitative
• Electroweak theory suggests new physics _at_ TeV
  scale Higgs ?
• Flavour physics becoming quantitative
• CKM looking better and better
• Neutrinos really do oscillate!
• Growing symbiosis with cosmology
• LHC on its way
• Good ideas for future accelerators
• ITRP has done its work

Lets get back to our work!