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Finding jets in heavy ion environment

Finding jets in heavy ion environment. … a painful learning. Jiří Dolejší, Prague. An easy work with pronounced jets, here the quark jet with E T =150 GeV and gluon jet with 120 GeV over HIJING backround (50 kparticles), only particle level. Towers of the size 0.1x0.1, | h | <1.7. . .

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Finding jets in heavy ion environment

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  1. Finding jets in heavy ion environment … a painful learning Jiří Dolejší, Prague An easy work with pronounced jets, here the quark jet with ET=150 GeV and gluon jet with 120 GeV over HIJING backround (50 kparticles), only particle level. Towers of the size 0.1x0.1, |h|<1.7  

  2. Finding jets in heavy ion environment One can take a small sliding window (3x3), get a seed and proceed in a standard way. Granularity 0.1 x 0.1 is comparable with a single hadron shower width in tilecal, reasonable jet cone from pp experience is 0.4-0.7  

  3. Finding jets in heavy ion environment But what to do with that stubble (with only 35 GeV jet)? Small sliding window provides no help !!! Do you see a jet here?    

  4. Finding jets in heavy ion environment The fluctuations between individual towers are comparable to average energy, try the larger window to stabilize the average? <(DE)2>  

  5. Finding jets in heavy ion environment 9x9 sliding window with gaussian smoothing shows nice waves, but no sign of 35 GeV gluon jet is visible. Pronounced jets survive.    

  6. Finding jets in heavy ion environment • Many open questions and tasks: • calorimetry simulation with arbitrary mixing of background and jets • a “picture vocabulary” of jets with different parents and the calorimetry response • a reasonable statistics study of the effectivity of jet finding and reconstruction • hints for specific algorithms • are the fluctuation patterns interesting for the theory like high moments CMBR??? • . . .

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