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 3: Hidden Valley (Secluded Sector) – 1<br />
BSM Physics 3: Hidden Valley (Secluded Sector)<br />
What if new gauge groups at low energy scales, hidden by<br />
potential barrier or weak couplings? (M. Strassler & K. Zurek, . . . )<br />
Complete framework implemented in PYTHIA:<br />
⋆ New gauge group ei<strong>the</strong>r Abelian U(1) or n<strong>on</strong>-Abelian SU(N)<br />
⋆ 3 alternative producti<strong>on</strong> mechanisms<br />
1) massive Z ′ : qq → Z ′ → q v q v<br />
2) kinetic mixing: qq → γ → γ v → q v q v<br />
3) massive F v charged under both SM and hidden group<br />
⋆ Interleaved shower in<br />
QCD, QED and HV sectors:<br />
add q v → q v γ v (and F v )<br />
or q v → q v g v , g v → g v g v ,<br />
which gives recoil effects<br />
also in visible sector<br />
L. Carl<strong>on</strong>i & TS, JHEP 09 (2010) 105;<br />
L. Carl<strong>on</strong>i, J. Rathsman & TS, JHEP 04 (2011) 091<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 36/46
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