Post on 28-Jan-2016
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Status G Section of Whitepaper
J. Sowinski, A. Deshpande, Y. Goto, M. Stratmann,B. Surrow,
W. Vogelsang
4/21/2008 RSC Meeting BNL J. Sowinski 2
Our charge from Steve
“…should probably include brief updates on present projections of Delta G and transverse spin sensitivities to be attained in the remaining 200 GeV running”
“Will there be sufficient integrated luminosity to attain the desired Delta G sensitivities in photon and photon-jet production? If not, are there alternatives?”
For you in this talk:What is missing?What is too much?Refine the message(s)?
4/21/2008 RSC Meeting BNL J. Sowinski 3
Only room for the most prominent results
STAR incl. jets PHENIX incl. 0s
4/21/2008 RSC Meeting BNL J. Sowinski 4
These results from RHIC have had a strong impact on our knowledge of G
Global fit D. de Florian, R. Sassot, M. Stratmann and W. Vogelsang
4/21/2008 RSC Meeting BNL J. Sowinski 5
Future: Increased statistics for inclusives still have important contributions to make
PHENIX 25 pb-1 P=60%
G=0.15G=0
Add run 9 to G.A. (Run6)/4
4/21/2008 RSC Meeting BNL J. Sowinski 6
Semi-inclusive channels to map g(x)STAR di-jets 50 pb-1 P=60%
Xmin = 0.08Xmax =0.20
Xmin = 0.08Xmax =0.20
Xmin = 0.13Xmax =0.15
Xmin = 0.08Xmax =0.32
Xmin = 0.04Xmax =0.37
Xmin = 0.03Xmax =0.46
Typical partonic x pT =10 GeV (LO)
4/21/2008 RSC Meeting BNL J. Sowinski 7
-jets limited in statistics at 50 pb-1 but still could have impact
xgluon resolution in PHENIX greatly improved with vertex tracker
100% eff. - Perfect BG rejection in STAR for -jets. Di-jets hard to beat but strong cross check could be possible.
50 pb-1 P=60%
GSRV
DSSV
4/21/2008 RSC Meeting BNL J. Sowinski 8
Placeholder for feasibility of -jet statistical precision
STAR MC simulations – hope to still have something by PAC
SMD shower shape bg rejection vs. efficiency
4/21/2008 RSC Meeting BNL J. Sowinski 9
What about lower xgluon ?
g(x=0.02)/g(x=0.02)~0.05
Central detectorspT=10GeV
FMS -central jetpT=2GeV
Q2 = 10GeV2
FMS -jet correlation for pT=2GeV and estimate significant number of events in 50 pb-1 wrt g(x)/g(x)=0.05
What is g(x)/g(x) allowed to do for x<0.02?500 GeV one option.
Phenix similar possibility with MPC – Central Cal.
4/21/2008 RSC Meeting BNL J. Sowinski 10
W physics means lots of beam time at 500 GeV.What can we do there for G?Lower x….
The end of this talk but not the work.