Studies of e+A physics at an Electron-Ion Collider Liang Zheng On behalf of the BNL EIC Science Task Force Brookhaven National Lab Institute of Particle.

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Presentation transcript:

Studies of e+A physics at an Electron-Ion Collider Liang Zheng On behalf of the BNL EIC Science Task Force Brookhaven National Lab Institute of Particle Physics, Central China Normal University Division of Nuclear Physics American Physical Society October 23-26, 2013 Newport News, VA

Overview EIC eA physics program – Nuclear PDF Nuclei F 2 /F L – Nuclear Imaging Coherent t distribution in diffraction – Saturation Inclusive diffraction Dihadron correlation – Parton propagation and hadronization in nuclear medium 2013/10/25DNP 2013, Liang Zheng2

Explore the small x regime Gluons dominate at small x – 99% of proton mass accounted by QCD interaction – Gluon PDF grows explosively at small x 2013/10/25DNP 2013, Liang Zheng3 Must be tamed at some point

Explore the small x regime Gluons dominate at small x – 99% of proton mass accounted by QCD interaction – Gluon PDF grows explosively at small x gluon recombination Nonlinear evolution like BK alternative to DGLAP, BFKL due to gluon recombination. Saturation regime, Q 2 <<Q 2 s (x) 2013/10/25DNP 2013, Liang Zheng4

Nuclear amplification 2013/10/25DNP 2013, Liang Zheng5 Gluon density scales as nuclear size Effective x much smaller in a nuclei

EIC eA kinematics coverage 2013/10/25DNP 2013, Liang Zheng6 Largely extend current reach Possible to explore the saturation regime

Diffractive cross section 2013/10/25DNP 2013, Liang Zheng7 σ diff /σ tot 15% at HERA, predicted 25-40% in eA σ diff ～ g(x,Q 2 ) 2 Rapidity gap: Signature of a diffractive event. Color-neutral exchange t=(p-p’) 2

Diffractive cross section 2013/10/25DNP 2013, Liang Zheng8 Significant difference between saturation and non- saturation Strong discrimination power within a few months of running.

Dihadron correlation Back to back hadron pairs decorrelate Strong suppression at away side predicted by saturation Probe nuclei in k T space. 2013/10/25DNP 2013, Liang Zheng9 Xiao, Dominguez, Yuan 2011/2012 y=0.7 z h1 = z h2 = 0.3 p 1T >2GeV 1GeV < p 2T < p 1T trigger associate  transverse plane

Dihadron correlation: non- saturation 2013/10/25DNP 2013, Liang Zheng10 ep/eAu 20x100 GeV 0.6<y<0.8 1 <Q 2 <2 GeV 2 p t1 >2 GeV, 1 GeV<p t2 <p t1 0.2<z1,z2< < ν < 3412 GeV =2.59x10 -4 =3.42x10 -2 Charged particles Nuclear effect: nPDF EPS09 Cold nuclear medium energy loss

Dihadron correlation: saturation Constrain sat/nosat models a lot with limited statistics of 1fb -1. Strong suppression can not be reproduced by the nosat model. 2013/10/25DNP 2013, Liang Zheng11

Summary Key eA measurements at EIC: – Ratio of diffractive cross section to total, “day one” measurement – Dihadron correlation in ep/eA, mark out the saturation region with a low luminosity requirement and ep baseline – More details : arXiv: EIC White paper wiki.bnl.gov/eic/index.php/Main_Page What can we learn from this – Understand the collective dynamics of gluons – Investigate inner landscape of a nuclei – Provide initial state input to pA/AA 2013/10/25DNP 2013, Liang Zheng12

Back up

Structure functions 2013/10/25DNP 2013, Liang Zheng14 eAu: 5x50 2 fb -1 5x75 4 fb -1 5x100 4 fb -1 Running combined 6 months total (50% eff) Systematics-error dominated Sensitive to gluons

Diffraction 2013/10/25DNP 2013, Liang Zheng15 Exclusive Vector meson production Coherent: nuclei intact Incoherent: break up Finding the source

10x100 GeV Lc = z 0.35 (1-z) ν y = 0.3, z = 0.3, ν = 640 GeV, Lc = 420 fm y = 0.7, z = 0.3, ν = 1492 GeV, Lc = 979fm charged pion z>0.1, ν>6 GeV, xFeynman>0, p T >0.1 GeV Where we are 2013/9/19eic-tf-meeting16 Dihadron correlation at an EIC

2013/9/19eic-tf-meeting17 Kinematics coverage in the Dihadron correlation at an EIC Q s 2 for Au Q s 2 for Ca Q s 2 for proton 10x10020x100 Black box:0.6<y<0.8 Red box:0.25<y<0.35

2013/9/19eic-tf-meeting18 Dihadron correlation in different kinematics bins (no sat) 10x100 GeV 1fb -1

2013/9/19eic-tf-meeting19 10x100 GeV 1fb -1 Dihadron correlation in different kinematics bins (sat)