Brian A. Cole - Thy Phy Bnl

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Jet Definitions, angular coverageSTARp-p di-jet Event• Trade-offs in jet definition:– Larger angular coverage collects more of the jet⇒Smaller losses due to radiation (soft and hard)– Larger angular coverage increases overlap of showers⇒And increases contribution of underlying event• Changing angular scale can change # of jets10
Jet Algorithms, considerations• Jets defined by the algorithm• To be calculable in pQCDalgorithm should be– Collinear safe⇒Insensitive to small-θ splitting– Infrared safe⇒ #, position, energy of jetsinsensitive to soft hadrons– Well-defined procedure fordistinguishing between 1, 2 jetsat a given angular scale• In last 5 years:– Death of seeded cone, mid-point– New: SIScone, Anti-KT, +⇒SIS = Seedless, infrared safe11
Page 1 and 2: High pT Physics: LHC ProspectsBrian
Page 3 and 4: CMS Event Display3
Page 5 and 6: 5Picturing (and understanding) high
Page 7 and 8: 7Picturing (and understanding) high
Page 9: Picturing (and understanding) jetsR
Page 13 and 14: Different Jet Algorithms13
Page 15 and 16: (very) Preliminary LHC Jet Data: CM
Page 17 and 18: ATLAS Charged Particle Spectrum•
Page 19 and 20: Understanding A+A Jet MeasurementsC
Page 21 and 22: Jet “Suppression”Vitev,Ratio of
Page 23 and 24: 23Jet Modifications: ExpectationsWi
Page 25 and 26: ATLAS: Modified Fragmentation Func.
Page 27 and 28: True Jet measurements in progressST
Page 29: Prospects• 7 TeV p-p- LHC magnets

Brian A. Cole - Thy Phy Bnl

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