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Inkyu ’ s X - FILE : Local Compactness

PHOBOS. 21 st Century PHOBOS presents. Inkyu ’ s X - FILE : Local Compactness. Y 2. Y 2. Motivation : Flow systematics. Is Flow the unique source E-by-E modification of dN/d h d f ? STAR showed “Jet-ness” at RHIC… - v2 = Flow (x%) + Jet (1-x %). Jet. Dilution. Enhancement.

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Inkyu ’ s X - FILE : Local Compactness

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  1. PHOBOS 21st Century PHOBOS presents Inkyu’s X - FILE :Local Compactness Inkyu Park - Phobos Collaboration Meeting - BNL

  2. Y2 Y2 Motivation : Flow systematics • Is Flow the unique source E-by-E modification of dN/dhdf ? • STAR showed “Jet-ness” at RHIC… - v2 = Flow (x%) + Jet (1-x %) Jet Dilution Enhancement Can we do STAR-like jet study? Don’t have Pt trigger… If yes, 1) useful for Flow systematics, 2) potential new physics menu Inkyu Park - Phobos Collaboration Meeting - BNL

  3. dN/dh ~ flat from h=-2 to h=2. full azimuthal acceptance, f=-p to f=p. Additional tool • Need a Jet algorithm • ATLAS/JetFinder Library : cone, double-cone, kT, pair-wise merging, sliding windows, MGS, etc … • No need of “Pt/Et” seed, not sensitive to MB hits E-by-E Jet-finding from dNh/dhdf Similar to v2 • Need to correct Octagon acceptance (phase space, cracks). • Need to fix Hot/Dead channels, fix CMN problem. • Need to apply 2D Poisson correction, Occ(h,f). Inkyu Park - Phobos Collaboration Meeting - BNL

  4. Designed for Top quark mass, Heavy-Higgs search Dynamical Jet size variation, give the best Jet energy calibration Image Processing method, Rely on compactness, No license fee p f -p h -2 2 ATLAS/MGS algorithm : Local Compactness AHD (Average Hit Density) = #hits / Total Area LHD (Local Hit Density) = #hits inside / window size LC= LHD/AHD AHD = 24/(2p x 4) ~ 0.95, LHD = 9/(p r2 ) ~ 4.47 LC= 4.7! Inkyu Park - Phobos Collaboration Meeting - BNL

  5. A typical LC event : peripheral PR01 data (Flow) LC>2 Inkyu Park - Phobos Collaboration Meeting - BNL

  6. A typical LC event : peripheral Inkyu Park - Phobos Collaboration Meeting - BNL

  7. A typical LC event : peripheral Inkyu Park - Phobos Collaboration Meeting - BNL

  8. A typical LC event : peripheral Inkyu Park - Phobos Collaboration Meeting - BNL

  9. A typical LC event : mid-central Inkyu Park - Phobos Collaboration Meeting - BNL

  10. A typical LC event : mid-central Inkyu Park - Phobos Collaboration Meeting - BNL

  11. A typical LC event : most central Inkyu Park - Phobos Collaboration Meeting - BNL

  12. # of LCs : peripheral events MC shows more LCs (Flow, Fluctuation) Inkyu Park - Phobos Collaboration Meeting - BNL

  13. # of LCs : mid-central events Starting from bin 4, Data show more LCs (Jet-ness ?) Inkyu Park - Phobos Collaboration Meeting - BNL

  14. # of LCs : central events Data show 3 or 4 times more LCs, even di-jets (Jet-ness !) 4 times higher Prob Inkyu Park - Phobos Collaboration Meeting - BNL

  15. Data show higher Prob. of Local Compactness! much more than the contribution from Flow Are they Jets? CMN problems? Secondary shower? important source of Non-flow correlation At best, can be a new physics menu We have larger acceptance (-2 to 2). STAR: -0.7 to 0.7 At worst, can be used for v2 systematics (non-flow) Still long way to go, to get a conclusion Summary Inkyu Park - Phobos Collaboration Meeting - BNL

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