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Details of Jet Reconstruction and Their Impact on Jet Quenching ...

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Summary<br />

• There are subtleties in the jet rec<strong>on</strong>structi<strong>on</strong> algorithm in<br />

heavy i<strong>on</strong> collisi<strong>on</strong>s<br />

– Fake rate from correlate background fluctuati<strong>on</strong>s<br />

– Modificati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> k T jet shape<br />

• These issues can <str<strong>on</strong>g>and</str<strong>on</strong>g> need to be overcome by careful study<br />

from data for jet rec<strong>on</strong>structi<strong>on</strong> to become st<str<strong>on</strong>g>and</str<strong>on</strong>g>ard in heavy<br />

i<strong>on</strong> collisi<strong>on</strong>s.<br />

• Underst<str<strong>on</strong>g>and</str<strong>on</strong>g>ing <str<strong>on</strong>g>of</str<strong>on</strong>g> the underlying event is crucial to<br />

underst<str<strong>on</strong>g>and</str<strong>on</strong>g>ing <str<strong>on</strong>g>and</str<strong>on</strong>g> performing jet rec<strong>on</strong>structi<strong>on</strong><br />

measurements in heavy i<strong>on</strong> collisi<strong>on</strong>s.<br />

– Can we measure, n<strong>on</strong>-jet, correlated background fluctuati<strong>on</strong>s?<br />

High-pT at LHC '09<br />

02/06/2009<br />

29

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