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dihadron correlation from Bowen Xiao

dihadron correlation from Bowen Xiao. ep, eAu 30x100 GeV and (5x100 GeV) Q 2 : 10,4,1 GeV 2 Trigger/Associate p T : 2/1 GeV/c and 4/2 GeV/c y=0.7 (virtual photon takes 70% of the electron energy) z 1 ,z 2 : two pions take about 30% of photon longitudinal momentum. 30x100 GeV: ep vs eAu.

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dihadron correlation from Bowen Xiao

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  1. dihadron correlation from Bowen Xiao • ep, eAu 30x100 GeV and (5x100 GeV) • Q2: 10,4,1 GeV2 • Trigger/Associate pT: 2/1 GeV/c and 4/2 GeV/c • y=0.7 (virtual photon takes 70% of the electron energy) • z1,z2: two pions take about 30% of photon longitudinal momentum

  2. 30x100 GeV: ep vs eAu Q2 =1 GeV2 Q2 =4 GeV2 Q2 =10 GeV2

  3. 30x100 GeV ep eAu Q2 :10,4,1 GeV2 Q2 :10,4,1 GeV2

  4. 30x100 GeV eAu pT cut: Trigger/Associate=4/2 GeV/c pT cut: Trigger/Associate=2/1 GeV/c

  5. Summary I • Q2=1 GeV2, pT cut 2, 1 GeV:  Suppression factor between p and A (peak to peak) is 2.1. • Q2=4 GeV2, pT cut 2, 1 GeV:  Suppression factor between p and A (peak to peak) is 1.9. • Q2=10 GeV2, pT cut 2, 1 GeV; Suppression factor between p and A (peak to peak) is 1.8. • Proton correlation at different Q2:1,4, 10 GeV2, pT cut 2, 1 GeV. The proton correlation changes very slowly with different values of Q2. • Nucleus correlation at different Q2: 1,4, 10 GeV2, pT cut 2, 1 GeV. The correlation in eA collisions changes faster than ep. In general, the correlation increases with higher Q2. • This is the reason that Suppression factor between proton and A decreases with Q^2.

  6. 30x100 GeV eAu with pT cut 4/2 GeV • ep shows similar feature

  7. 5x100 GeV

  8. Summary II • Q2=1 GeV2, pT cut 4, 2 GeV;  Suppression factor between p and A (peak to peak) is 1.4. (Q2=4 or 10 GeV2 plots are almost the same.) • There is very little change to the plot if I change Q2 to 4 and 10 GeV2. I believe this is due to large pT cut. 4GeV cut seems too high as compared to saturation momentum which is about 1-2 GeV. • Nucleus correlation, different Q2: 1,4, 10 GeV2, pT cut 4, 2 GeV. The correlation in eA collisions increases very slowly with Q2 due to large pT cut. The same thing happens for the proton curves. • Curves for EIC phase-I: • at 5(e) x 100(p/A) GeV with Q2 at 1 GeV^2 • trigger: pt > 2GeV/c, associate: 1 < pt  < 2 GeV/c (suppression factor from p to A is about 1.5) • There is less suppression from proton to nucleus if we compare to the case which the energy of the electron is 30 GeV (which is 2.1) • The feature is okay, but the detail may not be right. This is because at low energy, the x of the probed gluon is not very small. In this situation, the model that we are using now may not be applicable.

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