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Physics with RHIC Spin Collider ---- just taking off ----- Hideto En’yo RIKEN / RIKEN-BNL Research Center. Contents Status of Spin Collider Physics of Spin Collider First Results, Highlights Summery & Outlook. Two Rings in the Tunnel. KEK OPPPS, Tuned for RHIC at TRIUMPH

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physics with rhic spin collider just taking off hideto en yo riken riken bnl research center
Physics with RHIC Spin Collider---- just taking off -----Hideto En’yo RIKEN / RIKEN-BNL Research Center

Contents

  • Status of Spin Collider
  • Physics of Spin Collider
  • First Results, Highlights
  • Summery & Outlook

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

polarized proton acceleration

Two Rings in the Tunnel

KEK OPPPS,

Tuned for RHIC at TRIUMPH

500 mA, 300 ms

AGS: Partial Siberian Snake

Booster: No Spin Resonance

Transfer Lines to RHIC, Spin transparent

Polarized Proton Acceleration

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

snake magnet

RHIC

PHENIX

STAR

LINAC

AGS

Snake Magnet

Proton and its spin motion in Snake

4 Helical Dipoles – one Snake

essential invention for RHIC spin

2 Snakes in each ring

Snake axis orthogonal each other

Spin is preserved up to 250GeV

RIKEN fund

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

coulomb nuclear interference polarimeter

PaNic02 K.Kurita

Carbon filament target (5mg/cm2)in the RHIC beam

Measure recoil carbon ions at q~90º

100 keV < Ecarbon< 1 MeV

up

Si #6

Arrival time (ns)

Si #1

Carbon

left

right

RHIC

Si #5

Si #2

Wave-Form Digitizer +FPGA

high counting rates (~0.5 MHz) scaler measurement  de ~ 310-4 in ~1 minute.

PHENIX

Si #3

STAR

Si #4

down

ADC values

Beam’s View

LINAC

AGS

Coulomb Nuclear Interference Polarimeter

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

luminosity in year 1

PHENIX 150 nb-1

Luminosity in Year 1

Machine Luminosity

300 nb-1 /week

Peak 1.8x1030 cm-2s-1

350

300

250

STAR 300 nb-1

200

150

100

50

0

1

3

5

7

9

11

13

15

17

19

21

23

25

27

29

31

33

Days into run (from 12/20/01)

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

polarization in year 1
Polarization in Year 1

Yellow Ring

Blue Ring

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

why polarization was low

PRHIC

10% 20% 30%

PAGS

Why polarization was low ?

Source

Improvement

New AGS

SNAKE

2004-5

Ramp up

Spead

Injection

1st Year

AGS motor generator failure

½ ramp up speed

2x resonance effect

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

prospect of machine performance

Prospect of Machine performance

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

the spin experiments

pp2pp

RHIC

Spin Rotators

PHENIX

STAR

LINAC

AGS

The Spin Experiments

pp elastic

Silicons in Roman pot

-t down (0.004 GeV/c)2

b*=10m (special tune)

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

spin physics at rhic
Spin Physics at RHIC

RHIC = polarized parton collider

  • Spin Structure of Nucleon
    • 1/2=(1/2)DS+DG+Lq+Lg
      • DG: gluon polarization
      • Dq: Anti-quark polarization
    • New Structures
      • h1: transversity
  • NEW TOOL to study hadronic processes
    • W,Z @500GeV
      • flavor sensitive studies on the structure functions
    • cc/bb
      • Production mechanism
    • Spin in the fragmentation
    • Parity,CP violating interaction?
  • Test of pQCD
    • Use asymmetries sensitive ONLY to the higher orders (AN at high PT etc.)

?QCD triumph?

or

?beyond ?

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

asymmetries measurements
Asymmetries Measurements
  • ALL:Double Longitudinal Spin Asymmetry
    • Useful in extracting quark/gluon helicity distributions

AN:Twist-3 or T

ATT: Transversity

AL:Parity Violation

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

impact of rhic spin on d g

Impact of RHIC Spin on Dg

Global QCD Analysis

With RHIC DATA (1year)

AAC Preliminary

AAC Preliminary

M. Hirai, H.Kobayashi, M. Miyama et al.

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

measurements of d q d q at phenix

N.Saito

Measurements of Dq, Dq at PHENIX

Parity violating single Asymmetry

unpolarized distribution  polarized distribution

  • d small at high x Du/u (Dd/d for W-) flavor selected valence quark polarization
  • Dd/d (Du/u for W-) determination

Major background is Z decay (20%)

systematic error will be minimized (~1%) with ALZ (~20%)and s(Z) measurements

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

data from the 1 st polarized pp runs

Data from the 1st polarized pp runs

Run all the time with vertical polarization

polarization is too low to perform double spin

No gluon information

Commission the detectors for polarized pp

Cross section reference for pp and AA

First measurements of L-R asymmetry at

root s = 200GeV

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

pheneix p 0 cross section

Spin02 B.Fox (RBRC)

QM02 H,Torii(Kyoto)

PaNic02 Y. Goto(RIKEN)

PHENIX Preliminary

Normalization error of 30% not shown.

PHENEIXp0 cross section

  • Pt Spectrum over 108 magnitude
  • NLO pQCD calculation
    • CTEQ5M pdf
    • Potter-Kniehl-Kramer(PKK)
    • fragmentation function
    •  = pT/2, pT, 2pT
  • Consistent with data within the scale dependence.

pT dependent systematic error

MB trigger

2x2 trigger

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

phenix j

Spin02 H. Sato( Kyoto) Panic02 K.Ozawa(CNS)

PHENIX J/

Rapidity distribution compared

with PHITHIA simulation

Total Cross section vs. the Color-Evaporation Model prediction

e+e-

µ+µ-

Br(J/l+l-) (total) = 226  36 (stat.)  79 (syst.) nb

 (p+pJ/X) = 3.8  0.6 (stat.)  1.3 (syst.) µb

  • CEM Parameters are fixed by fitting low energy data
  • The result agrees with the CEM prediction at s=200GeV

PHENIX Preliminary

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

physics in a n l r asymmetry useful for local polarimeter for collision point

Physics in AN (L-R Asymmetry)useful for local polarimeter for collision point

E704 at Fermilab

at s=20 GeV, pT=0.5-2.0 GeV/c:

PT

XF 0.2 0.4 0.6 0.8

STAR TPC

PHENIX MUON

PHENIX CENTRAL

STAR

FPD

BBC

pp2pp

0o CAL

0 1 2 3 4 5

Rapidity

Models:: Transversity, Higher Twist,

Fragmentation, kT, Orbital. Etc.

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

star forward rapidity high x f p 0 a n

Spin02 G.Rakness(IUCF)

STAR Forward rapidity high xF p0 AN

AN

Theory predictions

at pT = 1.5 GeV/c

Collins effect

Anselmino, et al.

PRD 60 (1999) 054027.

Sivers effect

Anselmino, et al.

Phys. Lett. B442 (1998) 470.

Twist 3 effectQiu and Sterman,

Phys. Rev. D59 (1998) 014004.

Y.Koike

PaNic02

0.4

STAR FPD Preliminary Data

Assuming AN(CNI)= 0.013

pT=1.1 - 2.5 GeV/c

0.2

0.0

Systematic uncertainty +- 0.05

0

0.2

0.4

0.6

0.8

1.0

-0.2

xF ~E / 100 GeV

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

beam beam counter bbc

Beam-Beam Counter (BBC)

Luminosity Monitor of STAR

Scintillator annulus installed around the beam

pipe, on the east and west poletips of STAR

magnet at ±3.5m from IR ( 2 < |h| < 5)

beam pipe

~7m

STAR Magnet

+ TPC

FPD

BBC (East)

BBC (West)

Schematic side view of STAR

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

star bbc

Spin02 J.Kiryluk(UCLA)

STAR BBC

Demonstrate that asymmetry sensitivity better than 1/1000

Small since p+ p- cancellation ?

BBC

Asymmetry

Asymmetry Measured by RHIC polarimeter

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

12 o clock local polarimeter for phenix

Spin02 Y.Fukao(Kyoto)

Panic02 M.Togawa(Kyoto)

Neutron Veto

EM Cal Base

Charge Veto

PbWO4

Hadron Cal Base

Scintillator

Post-shower

Pb

W+Fiber Cal

12 O‘clock(local polarimeter for PHENIX)

p0

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

12 o clock

12 O’clock

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

asymmetries a n seen

Asymmetries (AN) seen

PT

XF 0.2 0.4 0.6 0.8

p0

+10 ~ +20%

STAR TPC

PHENIX MUON

PHENIX CENTRAL

STAR

FPD

BBC

pp2pp

Neutron -10%

g -3%

p0 <3%

0o CAL

0 1 2 3 4 5

Rapidity

Charged

+1%

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

coming run with longitudinal polarization 3pb 1 p 50

Coming Run with longitudinal polarization3pb-1,P=50%

expectations

W. Vogelsang

PHENIX Charged

STAR JET

DG will be

directly probed

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

summary and outlook
Summary and Outlook
  • RHIC spin program has begun. We have a series of program over 5 years to go.
  • Y2001-2, The first polarized proton collision was successfully done with transversely polarized beam, produced unexpected spin phenomena which may relate to unknown behavior of QCD (transversity etc)
  • Y2002-3, The first measurements of helicity asymmetry will SOON be performed @200GeV. Sizable DG generates surprises in the data.
  • Y2003+, Statistics will be much improved @200GeV, ensuring the determination of DG . “Spin Crisis” will hopefully be solved by then.
  • Y2005+, Weak Bosons will be produced at RHIC, the NEW “flavor sensitive” tool for the anti-quark/quark polarization and unpolarized structure function of anti-quark measurements.
  • And beyond…

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC

many thanks to

Many Thanks To

RHIC Spin Collaboration(Spokesman: G. Bunce)

Spin physics is an integral part of the goals of the STAR, PHENIX and pp2pp experiments.

RHIC Accelerator Spin Group(Spokesman: T.Roser, Project Manager: W.Mackay)

RIKEN and RIKEN/BNL Research Center (Group Leaders: H. En’yo, G.Bunce,

N. Saito), Theory Group (W.Forgelsang et.al.)

STAR Spin Physics Working Group (Conveners: L. Bland, G. Eppley)

PHENIX Spin Physics Working Group (Conveners: Y. Goto, M. Perdekamp)

pp2pp Experiment (Spokesman: W. Guryn)

BNL Groups: RHIC Spin Group (Group Leader: G. Bunce);

KEK Accelerator Group(Y. Mori et al.);

Laboratory / University participation

Kyoto-U, TITech, ANL, IUCF, KEK and many others

.

PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC