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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W/Z emissi<strong>on</strong> in showers: motivati<strong>on</strong> – 3<br />
Leading electroweak correcti<strong>on</strong>s of type α w ln 2 (Q 2 /M 2 W ):<br />
Bloch-Nordsieck violati<strong>on</strong>: real/virtual n<strong>on</strong>-cancellati<strong>on</strong><br />
W/Z in final state is ano<strong>the</strong>r class of <strong>event</strong>s<br />
⇒ large negative correcti<strong>on</strong> to no-W/Z cross secti<strong>on</strong>s!<br />
Figure S. 19: Moretti, The effects M.R. of <strong>the</strong> Nolten O(αSα 2 and W )correcti<strong>on</strong>s[bottom]relativeto<strong>the</strong>fullLOresults(i.e.,<br />
D.A. Ross, Nucl. Phys. B759 (2006) 50<br />
through O(αS 2 + α Sα EW + αEW 2 )) [top] for <strong>the</strong> case of LHC for three choices of PDFs. They<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 40/46
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