PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC1 Hideto En’yo RIKEN / RIKEN-BNL Research Center Physics...
Transcript of PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC1 Hideto En’yo RIKEN / RIKEN-BNL Research Center Physics...
PaNic02 03/10/02 Hideto En'yo RIKEN/RBRC 1
Physics with RHIC Spin Collider---- just taking off -----
Hideto En’yo Hideto En’yo
RIKEN / RIKEN-BNL Research CenterRIKEN / RIKEN-BNL Research Center
ContentsContents Status of Spin ColliderStatus of Spin Collider Physics of Spin ColliderPhysics of Spin Collider First Results, HighlightsFirst Results, Highlights Summery & OutlookSummery & Outlook
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Polarized Proton Acceleration
KEK OPPPS, Tuned for RHIC at TRIUMPH
500 A, 300 sBooster: No Spin Resonance
Two Rings in the Tunnel
AGS: Partial Siberian Snake
Transfer Lines to RHIC, Spin transparent
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Snake Magnet
STARPHENIX
AGSLINAC
RHIC
Proton and its spin motion in Snake4 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
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Beam’s View
Si #1
Si #2
Si #4 Si #3
left right
down
up
Si #5
Si #6
Carbon filament target (5mg/cm2) in the RHIC beam
Measure recoil carbon ions at 90º
100 keV < Ecarbon< 1 MeV
Wave-Form Digitizer +FPGA high counting rates (~0.5 MHz)
scaler measurement ~ 310-4 in ~1 minute.
Carbon
ADC values
Arr
ival
tim
e (n
s)
Coulomb Nuclear Interference Polarimeter
STARPHENIX
AGSLINAC
RHIC
PaNic02 K.Kurita
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Luminosity in Year 1
0
50
100
150
200
250
300
350
1 3 5 7 9 111315171921232527293133Days into run (from 12/20/01)
STAR 300 nb-1
PHENIX 150 nb-1
Machine Luminosity300 nb-1 /week
Peak 1.8x1030 cm-2s-1
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Polarization in Year 1
Yellow Ring Blue Ring
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Why polarization was low ?
10% 20% 30%
PAGS
PRHIC
Injection1st Year
Ramp upSpead
SourceImprovement
New AGSSNAKE2004-5
AGS motor generator failure½ ramp up speed2x resonance effect
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Prospect of Machine performance
RUN #proton/bunch
[x109]#bunch Beta*
(m)
Emittance
(m)Luminosity
1030 cm-2s-1
Pol.
(%)
2001-
2002
70 55 3 25 1.8 15-25
2002-2003
100 112 1 25 16 45-55
2005- ? 112 1 ? ? 70-80
Design 200 112 1 20 80 70
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The Spin Experiments
STARPHENIX
AGSLINAC
RHIC pp2pp
Spin Rotators
pp elastic Silicons in Roman pot-t down (0.004 GeV/c)2
b*=10m (special tune)
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Spin Physics at RHIC
• Spin Structure of Nucleon
– 1/2=(1/2)+G+Lq+Lg G: gluon polarization q: Anti-quark polarization
– New Structures• h1: transversity
RHIC = polarized parton colliderRHIC = polarized parton collider
•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 ?
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• ALL: Double Longitudinal Spin Asymmetry– Useful in extracting quark/gluon helicity distributions
)()(
)()(
LLA
ATT: Transversity AN:Twist-3 or TAL:Parity Violation
Asymmetries Measurements
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Global QCD Analysis
AAC Pre
liminary
AAC Pre
liminary
M. Hirai, H.Kobayashi, M. Miyama et al.
Impact of RHIC Spin on g With RHIC DATA (1year)
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Measurements of q, q at PHENIX
– d small at high x u/u (d/d for W) flavor selected valence quark polarization
d/d (u/u for W) determination
Major background is Z decay (20%)
systematic error will be minimized (~1%) with A
LZ (~20%)and (Z) measurements
N.Saito
Au x M d x M d x M u x M
u x M d x M d x M u x MLW a W b W a W b W
a W b W a W b W
( , ) ( , ) ( , ) ( , )
( , ) ( , ) ( , ) ( , )
2 2 2 2
2 2 2 2
Parity violating single Asymmetry unpolarized distribution polarized distribution
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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
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PHENEIX 0 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.
PHENIX Preliminary
Normalization error of 30% not shown.
MB trigger 2x2 trigger
pT dependent systematic error
Spin02 B.Fox (RBRC)QM02 H,Torii(Kyoto)PaNic02 Y. Goto(RIKEN)
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PHENIX J/
µ+µ-e+e-
Br(J/l+l-) (total) = 226 36 (stat.) 79 (syst.) nb
(p+pJ/X) = 3.8 0.6 (stat.) 1.3 (syst.) µbPHENIX Preliminary
Total Cross section vs. the Total Cross section vs. the Color-Evaporation Model predictionColor-Evaporation Model prediction
• CEM Parameters are fixed by fitting low energy data• The result agrees with the CEM prediction at s=200GeV
Spin02 H. Sato( Kyoto) Panic02 K.Ozawa(CNS)
Rapidity distribution compared Rapidity distribution compared with PHITHIA simulationwith PHITHIA simulation
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Physics in AN (L-R Asymmetry)useful for local polarimeter for collision point
0 1 2 3 4 5Rapidity
STARFPD
0o CAL
BBC
PHE
NIX
MU
ON
PHE
NIX
CE
NT
RA
L
STA
R T
PCpp2pp
E704 at Fermilab at s=20 GeV, pT=0.5-2.0 GeV/c: XF 0.2 0.4 0.6 0.8PT
Models:: Transversity, Higher Twist,Fragmentation, kT, Orbital. Etc.
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STAR Forward rapidity high xF 0 AN
xF ~ E / 100 GeV
STAR FPD Preliminary DataAssuming AN(CNI)= 0.013pT=1.1 - 2.5 GeV/c
0.0
0.2
0.4
-0.20 0.2 0.4 0.6 0.8 1.0
AN
Systematic uncertainty + - 0.05
0 at s 200p p X GeV 0 at s 20p p X GeV Theory predictions
at pT = 1.5 GeV/c
Collins effectAnselmino, et al.PRD 60 (1999) 054027. Sivers effectAnselmino, et al.Phys. Lett. B442 (1998) 470.
Twist 3 effectQiu and Sterman,Phys. Rev. D59 (1998) 014004.
Y.KoikePaNic02
Spin02 G.Rakness(IUCF)
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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 < || < 5)
~7m
FPD
BBC (West)
STAR Magnet
+ TPC
BBC (East)
beam pipe
Schematic side view of STAR
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STAR BBC
Asymmetry Measured by RHIC polarimeter
BBCAsymmetry
Demonstrate that asymmetry sensitivity better than 1/1000Small since + - cancellation ?
Spin02 J.Kiryluk(UCLA)
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12 O‘clock( local polarimeter for PHENIX)
EM Cal Base
PbWO4
Charge Veto
Neutron VetoHadron Cal Base
Pb
Scintillator
W+Fiber Cal
Post-shower
Spin02 Y.Fukao(Kyoto)Panic02 M.Togawa(Kyoto)
0
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12 O’clock
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Asymmetries (AN) seen
0 1 2 3 4 5Rapidity
STARFPD
0o CAL
BBC
PHE
NIX
MU
ON
PHE
NIX
CE
NT
RA
L
STA
R T
PC
pp2pp
XF 0.2 0.4 0.6 0.8PT
0
+10 ~ +20%
Charged+1%
Neutron -10%
-3%
0 <3%
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Coming Run with longitudinal polarization
3pb-1,P=50%
W. Vogelsang
STAR JET
PHENIX Charged
G will be directly probed
expectations
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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 G generates surprises in the data.
• Y2003+, Statistics will be much improved @200GeV, ensuring the determination of G . “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 beyondbeyond…
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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
.