1 / 6

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. . .

octavia-kemp
Télécharger la présentation

Finding jets in heavy ion environment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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??? • . . .

More Related