report from india topical conference on hadron collider physics xiii jan 14-20, tifr, india naohito...
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Report from IndiaTopical Conference on Hadron Collider Physics XIII
Jan 14-20, TIFR, India
Naohito SaitoRIKEN/ RIKEN BNL Research Center
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Topical Conference on Hadron Collider Physics
• Previously called “Proton-Antiproton collider physics”, changed to include ep and pp, sometimes ee and , 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
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Programme• Electroweak Physics
– W/Z cross section– W mass (CDF/D0/LEP)– WW
• QCD– 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
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Number of detected W Bosons
• TEVATRON– Run 0 ‘88-89
4pb-1
– Run 1A ‘92-93 20pb-1
– Run 1B ‘94-95 90pb-1
– Run 1C ‘95-96 20pb-1
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W and Z Cross Sections• TEVATRON Measurements and Theory
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W Boson Width
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W Boson Mass
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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
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W Boson Mass
• Direct W Mass Measurements
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Constraint on the Higgs
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Top Mass• Results
of D0 and CDF
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Top Cross Sections
• CDF > D0~ Theory
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W Helicity in Top Production• Longitudinall
y Polarized W
22
20
2)(
)(
Wt
t
Mm
m
bWt
bWt
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Z’ Search in Dilepton Mode• No deviations from SM
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Bottom Cross sections
• Theory still underestimates by a factor of 2
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HERA - Kinematic Range
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F2 vs Q2 from 1994 Data•Precision reached ~1% stat and ~3% syst
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J/ at HERA
• Color Octet Failed?
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Physics at RHICPhysics at RHIC• Study of QCD in extreme
conditions– 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
nucleon– search for a physics beyond
standard model
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Confinement and QGPConfinement and QGP• Quarks are confined in a had
ron– No free quark has been observed
• They can be free at;– high energy
• asymptotic freedom– high temperature– high density
• High temperature– a few sec after big-bang– in relativistic heavy ion collision
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Phase Diagram of Hadronic MattPhase Diagram of Hadronic Matterer
from hadro-chemical analysisfrom hadro-chemical analysis• At SPS and AGS,
the freeze-out points approach the “boundary”.
• RHIC and LHC should show clearer signal of phase transition
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RRelativisticelativistic H Heavyeavy I Ionon C Colliderollider (RHIC) (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
pp luminosity is for enhanced mode.
RHIC Accelerator Specification
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STAR Detector in STAR Detector in Assembly HallAssembly Hall
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PHENIX at Experimental PHENIX at Experimental HallHall
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PHENIX Priorities in PHENIX Priorities in Year-1Year-1
1. Sufficient Au+Au running to– Turn-on, calibrate, commission all installed detectors– Reach 20 b-1 integrated L (to tape)
2. Polarized proton commissioning in one ring3. Anything else (e.g. p+A, lower E, lighter A)
• Coherent request with STAR
• RHIC Spin Collaboration (spokesman: G. Bunce) proposal– 4 weeks of commissioning in the first year
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Gluons at RHIC• Completely new domain of studies
– polarized gluon, G(x)•one of the major interests in RHIC Spin physics
– even unpolarized gluon G(x) •highest energy in pp collisions; any energy depe
ndent systematic uncertainty? – “EMC effect” in gluon
•pA and AA; how gluons behave in nuclei? •provide a basis of “exotic search” in AA
– J/ suppression ; open heavy flavor production– nuclear shadowing effect
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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