Report from IndiaTopical Conference on Hadron Collider Physics XIII

Jan 14-20, TIFR, India

Naohito SaitoRIKEN/ 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 , 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

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

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

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 Measurements

Constraint on the Higgs

Top Mass• Results

of D0 and CDF

Top Cross Sections

• CDF > D0~ Theory

W Helicity in Top Production• Longitudinall

y Polarized W

22

20

2)(

)(

Wt

t

Mm

m

bWt

bWt

Z’ Search in Dilepton Mode• No deviations from SM

Bottom Cross sections

• Theory still underestimates by a factor of 2

HERA - Kinematic Range

F2 vs Q2 from 1994 Data•Precision reached ~1% stat and ~3% syst

J/ at HERA

• Color Octet Failed?

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

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

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

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

STAR Detector in STAR Detector in Assembly HallAssembly Hall

PHENIX at Experimental PHENIX at Experimental HallHall

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

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

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