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EIC TF meeting, Feb 16 th , 2012. Another Update: eRHIC Impact on Helicity PDFs progress on plots for white paper. Marco Stratmann. [email protected]. work based on Elke’s DIS/SIDIS pseudo-data; in collaboration with Rodolfo . recall: new pseudo-data . - PowerPoint PPT Presentation
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EIC TF meeting, Feb 16th, 2012
Another Update: eRHIC Impact on Helicity PDFs
progress on plots for white paper
Marco [email protected]
work based on Elke’s DIS/SIDIS pseudo-data; in collaboration with Rodolfo
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recall: new pseudo-data
• use relative uncertainty of each point to produce mock data (based on DSSV)• “randomize” data within 1-sigma• for SIDIS: incl. 5% (10%) uncertainty from pion (kaon) frag. fcts.• map out χ2 profiles with Lagrange multiplier method (Hessian is work in progress)
5x100 and 5x250data for DIS & SIDIS (π± and K±)
10 fb-1 each, 70% beam pol.
cuts:• W2 > 10 GeV2 • depol. factor > 0.1• 0.01 < y < 0.95• pelec > 0.5 GeV• 1o < θ < 179o
• phadr > 1 GeV
global analysis:
Elke
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recall: first profiles for sea quarks
• very encouraging results• as expected, DIS has no impact • need to translate into error on x-shape
read off PDF parameters
for a given Δχ2
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first results on x-dep bands for quark
sea
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first results on sea quark asymmetry
to propagate uncertainties properly this is based on its own L.M. analysis
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new plot showing kinematic coverage &
current data
stage-1 5x100
20x250
plan: produce similar plots for GPDs, TMDs, and nuclear PDFs✔ Salvatore
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impact of 20x250 data on helicity PDFs ?
• range 0.001-1 covered best by 5 x 100 data
• 5x250 add more Q2 bins to play with Q2
min cut
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hot off the press: Δg profile at small x
20x250 mattersa lot here !
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best probe for small x gluonspQCD scaling violations
pos
itive
Dg
fixed targetdata
white paper: g1 scaling violation plot ?
x
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the “scaling violation plot”
try to put in othertheoretical curves
for different Δg
5x250 datastart t0
contribute
5x100 datastart t0
contribute
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last minute result: alternative Δg’s
DSSV+
more negative Δg
positive Δg
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underlying g1 “data” vs DSSV+
to do list: PDF correlations a la CTEQ
need to produce Hessian sets first – goal: ΔΣ – Δg correlation