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G from 0 A LL

G from 0 A LL. A.Bazilevsky RHIC Spin Collaboration meeting November 9, 2006. 0 A LL : G constrain. Fractional contribution to pp  0 X at s=200 GeV at  ~0.  0 production is sensitive to gluon distribution. PHENIX Preliminary Run5 pi0 A LL. 40% scale uncertainty is not included.

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G from 0 A LL

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  1. G from 0 ALL A.Bazilevsky RHIC Spin Collaboration meeting November 9, 2006

  2. 0 ALL: G constrain Fractional contribution to pp0X at s=200 GeV at ~0 0 production is sensitive to gluon distribution

  3. PHENIX Preliminary Run5 pi0 ALL 40% scale uncertainty is not included Data not consistent with “G=G” Data consistent with “G=0” and “std” Let’s try to say more…

  4. GRSV: G/G(x) and 0 ALL By Marco&Werner GRSV: G(Q2=1GeV2)= 1.76  +1.89 For each G refit of DIS data is done

  5. Chi2 vs G PHENIX Run5 Preliminary 0 ALL 1: [ -0.04; 0.52] 2: [-1.32; 0.70] Only experimental stat. errors included No theoretical uncertainties considered

  6. Chi2 vs G We can also easily include syst. scale uncertainty (40%) Other exp. syst. uncertainties can be also included (e.g. rel. lum., if sizable) Theoretical uncertainties not yet considered

  7. GRSV-std Run5 Run6 65 pb-1 70% Run7 From DIS (1 sigma?) 1 sigma 2 sigma 3 sigma

  8. GRSV: ALL=0 Run5 Run6 65 pb-1 70% Run7 From DIS (1 sigma?) 1 sigma 2 sigma 3 sigma

  9. Chi2 vs G Run5 65 pb-1 70% Run6 Run7 GRSV-std 1 sigma 2 sigma 3 sigma Run7 GRSV: ALL=0 Run7 Our sensitivity to G depends strongly on G

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