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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BSM physics 2: BSM R-hadr<strong>on</strong>s Physics 2: R-hadr<strong>on</strong>s<br />
What if coloured (SUSY) particle like ˜g or ˜t 1 is l<strong>on</strong>g-lived?<br />
⋆ Formati<strong>on</strong> of R-hadr<strong>on</strong>s<br />
˜g q q ˜t 1 q “mes<strong>on</strong>s”<br />
˜g q q q ˜t 1 qq “bary<strong>on</strong>s”<br />
˜g g<br />
“glueballs”<br />
⋆ C<strong>on</strong>versi<strong>on</strong> between R-hadr<strong>on</strong>s<br />
by “low-energy” interacti<strong>on</strong>s with matter:<br />
˜g u d+p→ ˜g u u d + π + irreversible<br />
⋆ Displaced vertices if finite lifetime, or else<br />
⋆ punch-through: σ ≈ σ had but<br />
∆E < ∼ 1GeV≪ E kin,R<br />
A.C. Kraan, Eur. Phys. J. C37 (2004) 91;<br />
M. Fairbairn et al., Phys. Rep. 438 (2007) 1<br />
CMS, arXiv:1101.1645<br />
Partly <strong>event</strong> generati<strong>on</strong>, partly detector simulati<strong>on</strong>.<br />
Public add-<strong>on</strong> in PYTHIA 6, now integrated part of PYTHIA 8.<br />
Can also be applied to n<strong>on</strong>-SUSY l<strong>on</strong>g-lived “hadr<strong>on</strong>s”.<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 35/46
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