Report from India Topical Conference on Hadron Collider Physics

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					         Report from India
Topical Conference on Hadron Collider Physics XIII
              Jan 14-20, TIFR, India

          Naohito Saito
RIKEN/ RIKEN BNL Research Center
                     Topical Conference on

        Hadron Collider Physics
• Previously called “Proton-Antiproton collider physics”,
  changed to include ep and pp, sometimes ee and mm,
  recently AA
• A series of conference on
   – the results from
       • SppS
       • TEVATRON
   – and the prospects for future
       • Run II@TEVATRON, LHC, NLC, and RHIC
• 120 participants; about a half from India
• No US-National-Lab participants
• Electroweak Physics
   – W/Z cross section
   – W mass (CDF/D0/LEP)
   – WWg
   – Jet/Dijet
   – Rapidity Gap/Diffraction
   – Structure Function: proton and photon
• Heavy Quarks
   – Top:mass, decay modes, cross section
   – Bottom:cross section, CP violation
• New Phenomena: Higgs, SUSY, Leptoquark, Compositeness
• Future: RHIC, LHC, NLC, and muon collider
      Number of detected W Bosons
   – Run 0 ‘88-89
   – Run 1A ‘92-93
   – Run 1B ‘94-95
   – Run 1C ‘95-96
      W and Z Cross Sections
• TEVATRON Measurements and Theory
W Boson Width
W Boson Mass
                W Boson Mass
•Run 1~100 pb-1=> CDF 90 MeV; D0 100 MeV --> Combined 70 MeV
•Run 2 ~ 2 fb-1 => 40 MeV per experiment
•TeV33~30 fb-1 => 20 MeV
            W Boson Mass
• Direct W Mass
Constraint on the Higgs
               Top Mass
• Results of
  D0 and CDF
         Top Cross Sections
• CDF > D0~ Theory
   W Helicity in Top Production
• Longitudinally
  Polarized W

(t  bW0 )     mt2
             2
(t  bW ) mt  2M W2
Z’ Search in Dilepton Mode
• No deviations from SM
          Bottom Cross sections
• Theory still
  s by a factor of
HERA - Kinematic Range
         F2 vs       Q 2   from 1994 Data
•Precision reached
~1% stat and ~3%
            J/y at HERA
• Color
                 Physics at RHIC
• Study of QCD in extreme
  – heavy ion physics - hot and dense limit
  – spin physics - high Q2 with spin d.o.f.
• Heavy Ion Physics
  – search for a new state of matter -
    Quark Gluon Plasma
  – characterize its physical properties
• Spin Physics
  – elucidate the spin structure of the
  – search for a physics beyond standard
                 Confinement and QGP
• Quarks are confined in a
   – No free quark has been observed
• They can be free at;
   – high energy
       • asymptotic freedom
   – high temperature
   – high density
• High temperature
   – a few msec after big-bang
   – in relativistic heavy ion collision
 Phase Diagram of Hadronic Matter
                  from hadro-chemical analysis

• At SPS and AGS,
  the freeze-out points
  approach the
• RHIC and LHC
  should show clearer
  signal of phase
Relativistic Heavy Ion Collider (RHIC)
• The first collider for
    – Heavy Ions: e.g. Au+Au at 200A GeV
         • current max: 18A GeV (CERN SPS)
    – Polarized Protons at 500 GeV
         • current max: 20 GeV (FNAL)
         • RIKEN BNL Collaboration
RHIC Accelerator Specification

  pp luminosity is for enhanced mode.
STAR Detector in Assembly Hall
PHENIX at Experimental Hall
    PHENIX Priorities in Year-1
1. Sufficient Au+Au running to
   – Turn-on, calibrate, commission all installed detectors
   – Reach 20 mb-1 integrated L (to tape)
2. Polarized proton commissioning in one ring
3. Anything else (e.g. p+A, lower E, lighter A)

• Coherent request with STAR

• RHIC Spin Collaboration (spokesman: G. Bunce)
   – 4 weeks of commissioning in the first year
             Gluons at RHIC
• Completely new domain of studies
  – polarized gluon, DG(x)
     • one of the major interests in RHIC Spin physics
  – even unpolarized gluon G(x)
     • highest energy in pp collisions; any energy
       dependent systematic uncertainty?
  – “EMC effect” in gluon
     • pA and AA; how gluons behave in nuclei?
     • provide a basis of “exotic search” in AA
        – J/y suppression ; open heavy flavor production
        – nuclear shadowing effect
    Unpolarized Gluon Distribution
• Comparison of the most recent analysis
     normalized to MRST central
  – MRST distribution
     • hep-ph/9803445
     • 3 versions of g(x)
     <kT> = 0.0, 0.4, 0.64 GeV
         – MRST(g↑) high gluon
         – MRST central
         – MRST(g↓) low gluon
  – CTEQ4M
     • PR D55 (97) 1280
  – CTEQ5 to be released with new kT analysis

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