NLO QCD parton shower matching for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mm

We present the implementation of a new interface in 3.0 supporting all diboson and triboson processes with fully leptonic final states, enabling next-to-leading order <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mi>NLO</a:mi><a:mo stretchy="false">)</a:mo><a:mo>+</a:mo><a:mi>parton</a:mi></a:mrow></a:math> shower (PS) matched calculations. To demonstrate its capabilities, we study parton shower effects in the triboson production process <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>p</e:mi><e:mi>p</e:mi><e:mo stretchy="false">→</e:mo><e:msup><e:mi>e</e:mi><e:mo>+</e:mo></e:msup><e:msub><e:mi>ν</e:mi><e:mi>e</e:mi></e:msub><e:msup><e:mi>μ</e:mi><e:mo>−</e:mo></e:msup><e:msub><e:mover accent="true"><e:mi>ν</e:mi><e:mo stretchy="false">¯</e:mo></e:mover><e:mi>μ</e:mi></e:msub><e:mi>γ</e:mi><e:mo>+</e:mo><e:mi>X</e:mi></e:math> using erwig 7.3 with NLO QCD amplitudes from 3.0. We estimate uncertainties from scale variations and analyze the impact of generation-level cuts on parton shower events. This study showcases the new interface’s potential and provides insights into the interplay between fixed-order calculations and parton shower effects in multiboson production processes, crucial for precision measurements and beyond the Standard Model searches at the LHC and future colliders.