Merge pull request #48830 from cericeci/15_1_X_suepfix

cmsbuild · web-flow · commit 689942b3576b · 2025-09-11T20:04:05.000+02:00
Fixed bug on longitudinal momentum computation for SUEP constituents
diff --git a/GeneratorInterface/Pythia8Interface/src/SuepShower.cc b/GeneratorInterface/Pythia8Interface/src/SuepShower.cc
@@ -155,7 +155,7 @@ const Pythia8::Vec4 SuepShower::generateFourVector() {
   // compose the 4 std::vector
   en = sqrt(momentum * momentum + darkmeson_mass_ * darkmeson_mass_);
   Pythia8::Vec4 daughterFourMomentum =
-      Pythia8::Vec4(momentum * cos(phi) * sin(theta), momentum * sin(phi) * sin(theta), momentum * sin(theta), en);
+      Pythia8::Vec4(momentum * cos(phi) * sin(theta), momentum * sin(phi) * sin(theta), momentum * cos(theta), en);
   return daughterFourMomentum;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -155,7 +155,7 @@ const Pythia8::Vec4 SuepShower::generateFourVector() {`
`155`	`155`	`// compose the 4 std::vector`
`156`	`156`	`en = sqrt(momentum * momentum + darkmeson_mass_ * darkmeson_mass_);`
`157`	`157`	`Pythia8::Vec4 daughterFourMomentum =`
`158`		`- Pythia8::Vec4(momentum * cos(phi) * sin(theta), momentum * sin(phi) * sin(theta), momentum * sin(theta), en);`
	`158`	`+ Pythia8::Vec4(momentum * cos(phi) * sin(theta), momentum * sin(phi) * sin(theta), momentum * cos(theta), en);`
`159`	`159`	`return daughterFourMomentum;`
`160`	`160`	`}`
`161`	`161`