Progress on the Pythia 8 event generator
Progress on the Pythia 8 event generator
Progress on the Pythia 8 event generator
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Systematic tuning<br />
RIVET: collecti<strong>on</strong> of experimental data,<br />
toge<strong>the</strong>r with matching analysis routines.<br />
Can be applied to <strong>generator</strong> <strong>event</strong>s<br />
for comparis<strong>on</strong> with data.<br />
PROFESSOR: parameter tuning<br />
in multidimensi<strong>on</strong>al parameter space.<br />
Generate large <strong>event</strong> samples at O(n 2 ) random points<br />
in (reas<strong>on</strong>able) parameter space. Slow!<br />
Analyze <strong>event</strong>s and fill relevant histograms.<br />
For each bin of each histogram parametrize<br />
n∑<br />
X MC = A 0 + B i p i<br />
i=1<br />
n∑ ∑n−1<br />
n∑<br />
C i pi 2 + D ij p i p j<br />
i=1 i=1 j=i+1<br />
Do minimizati<strong>on</strong> of χ 2 to parametrized results. Fast!<br />
Torbjörn Sjöstrand <str<strong>on</strong>g>Progress</str<strong>on</strong>g> <strong>on</strong> <strong>the</strong> <strong>Pythia</strong> 8 <strong>event</strong> <strong>generator</strong> slide 29/46
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