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Thoughts about F 2 and F L in eA

Thoughts about F 2 and F L in eA. DIS Kinematics. Potential limitations in kinematic coverage:. high y limited by radiative corrections can be suppressed by by requiring hadronic activity. y =0.85. HERA y >0.005. y =0.05. Strong x-Q 2 correlation high x  high Q 2

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Thoughts about F 2 and F L in eA

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  1. Thoughts about F2 and FL in eA BNL EIC-TF, September 2011

  2. DIS Kinematics Potential limitations in kinematic coverage: high y limited by radiative corrections can be suppressed by by requiring hadronic activity y=0.85 HERA y>0.005 y=0.05 • Strong x-Q2 correlation • high x high Q2 • low x low Q2 low y limited by Theta/momentum resolution for e’  use hadron method BNL EIC-TF, September 2011

  3. Structure function in eA BNL EIC-TF, September 2011

  4. Inclusive Structure functions in eA • How to extract FL: • Plot srvs Y+ • Need different values of Y+ •  Need to run at different √s • FL slope of srvs Y+ • F2 intercept of srvs Y+ with y-axis • Issues: • Lever arm in Y+ • Value of y / Y+ • At low y: detector resolution for e’ • At high y: radiative corrections and charge symmetric background BNL EIC-TF, September 2011

  5. Inclusive Structure functions in eA • Cuts: • Bin in Q2 (12 bins logarithmic ) and y (10 bins linear) with fixed x for each bin • Lowest √s y-bins Dy= 0.1 • Higher √s Dy gets smaller by ratio of √s1 / √s2 • 3 points in Y+ for each Q2-bin • 0.01 < Y+ < 0.95 • DY+ > 0.1 BNL EIC-TF, September 2011

  6. Inclusive Structure functions in eA BNL EIC-TF, September 2011

  7. Inclusive Structure functions in eA Need to combine bins according to the detector resolution Final y-range needs full MC study Start generate all the data now Djangoh in eA mode with eps-09-PDFs and rad-corrections BNL EIC-TF, September 2011

  8. syst. uncertainties Old plots ∫Ldt = 4/A fb-1 (10+100) GeV & 4/A fb-1(10+50) GeV & 2/A fb-1 (5+50) GeV All together5weeks at L ~1x1034cm-2 s-1& 50% duty cycle (Note: 1000x Hera L) WHAT was required for this study BNL EIC-TF, September 2011

  9. Diffractive Structure functions in eA • Defined the same way as inclusive ones  same x-Q2 coverage • Additional requirements • Rapidity gap between hadron beam and produced jet, J/psi, …. • For ep it was required: My < 1.6GeV –t<1.0GeV • Need to study: • What is our My and t – range • What is the influence of this on the model predictions • Is it okay to require no neutrons in the ZDC • this means we go from incoherent diffraction to coherent diffraction  Is this what we want? BNL EIC-TF, September 2011

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