From 0fb066d6b2b6bd81ac903df3dad825da8e00087c Mon Sep 17 00:00:00 2001
From: Juraj Smiesko <34742917+kjvbrt@users.noreply.github.com>
Date: Thu, 8 Feb 2024 09:54:09 +0100
Subject: [PATCH] Revert "Flipping x angle boost (#61)"

This reverts commit 76534580fbbc28f8cf8bfcf7c0ab429bcd59f9cb.
---
 .../src/SimG4CrossingAngleBoost.cpp           | 66 ++++++++++---------
 SimG4Components/src/SimG4CrossingAngleBoost.h |  3 +
 2 files changed, 39 insertions(+), 30 deletions(-)

diff --git a/SimG4Components/src/SimG4CrossingAngleBoost.cpp b/SimG4Components/src/SimG4CrossingAngleBoost.cpp
index 7ef1db6..8a14331 100644
--- a/SimG4Components/src/SimG4CrossingAngleBoost.cpp
+++ b/SimG4Components/src/SimG4CrossingAngleBoost.cpp
@@ -1,11 +1,21 @@
 #include "SimG4CrossingAngleBoost.h"
 
+// k4SimGeant4
+#include "SimG4Common/ParticleInformation.h"
+#include "SimG4Common/Units.h"
+
+// Geant4
+#include "G4Event.hh"
+
 // CLHEP
 #include "CLHEP/Units/PhysicalConstants.h"
 
 // EDM4HEP
 #include "edm4hep/MCParticleCollection.h"
 
+// DD4hep
+#include "DD4hep/Segmentations.h"
+
 
 DECLARE_COMPONENT(SimG4CrossingAngleBoost)
 
@@ -44,47 +54,44 @@ StatusCode SimG4CrossingAngleBoost::execute() {
   debug() << "Input particle collection size: " << inParticles->size()
           << endmsg;
 
-  double alpha = -m_alpha;
+  double alpha = m_alpha;
   double gamma = std::sqrt(1 + std::pow(std::tan(alpha), 2));
   double betagamma = std::tan(alpha);
 
   for (auto const& inParticle: *inParticles) {
     auto outParticle = inParticle.clone();
 
-    double e = std::sqrt(std::pow(inParticle.getMomentum().x, 2) +
-                         std::pow(inParticle.getMomentum().y, 2) +
-                         std::pow(inParticle.getMomentum().z, 2) +
-                         std::pow(inParticle.getMass(), 2));
-
     debug() << "---------------------------------------------------" << endmsg;
     debug() << "Particle:" << endmsg;
-    debug() << "  - PDG ID: " << inParticle.getPDG() << endmsg;
-    debug() << "  - mass: " << inParticle.getMass() << endmsg;
+    debug() << "  - PDG ID: " << outParticle.getPDG() << endmsg;
+    debug() << "  - time: " << outParticle.getTime() << endmsg;
     debug() << "  - vertex: " << endmsg;
-    debug() << "    - x: " << inParticle.getVertex().x << endmsg;
-    debug() << "    - y: " << inParticle.getVertex().y << endmsg;
-    debug() << "    - z: " << inParticle.getVertex().z << endmsg;
+    debug() << "    - x: " << outParticle.getVertex().x << endmsg;
+    debug() << "    - y: " << outParticle.getVertex().y << endmsg;
+    debug() << "    - z: " << outParticle.getVertex().z << endmsg;
     debug() << "  - momentum: " << endmsg;
-    debug() << "    - px: " << inParticle.getMomentum().x << endmsg;
-    debug() << "    - py: " << inParticle.getMomentum().y << endmsg;
-    debug() << "    - pz: " << inParticle.getMomentum().z << endmsg;
-    debug() << "  - energy: " << e << endmsg;
-
-    double x = gamma * inParticle.getVertex().x +
-               betagamma * CLHEP::c_light * inParticle.getTime();
-    double y = inParticle.getVertex().y;
-    double z = inParticle.getVertex().z;
-
-    float px = betagamma * e + gamma * inParticle.getMomentum().x;
-    float py = inParticle.getMomentum().y;
-    float pz = inParticle.getMomentum().z;
+    debug() << "    - px: " << outParticle.getMomentum().x << endmsg;
+    debug() << "    - py: " << outParticle.getMomentum().y << endmsg;
+    debug() << "    - pz: " << outParticle.getMomentum().z << endmsg;
 
+    double t = gamma * outParticle.getTime() +
+               betagamma * outParticle.getVertex().x / CLHEP::c_light;
+    double x = gamma * outParticle.getVertex().x +
+               betagamma * CLHEP::c_light * outParticle.getTime();
+    double y = outParticle.getVertex().y;
+    double z = outParticle.getVertex().z;
+
+    double e2 = pow(outParticle.getMomentum().x, 2) +
+                pow(outParticle.getMomentum().y, 2) +
+                pow(outParticle.getMomentum().z, 2) +
+                pow(outParticle.getMass(), 2);
+    float px = betagamma * std::sqrt(e2) + gamma * outParticle.getMomentum().x;
+    float py = outParticle.getMomentum().y;
+    float pz = outParticle.getMomentum().z;
+
+    outParticle.setTime(t);
     outParticle.setVertex({x, y, z});
     outParticle.setMomentum({px, py, pz});
-    double eb = std::sqrt(std::pow(outParticle.getMomentum().x, 2) +
-                          std::pow(outParticle.getMomentum().y, 2) +
-                          std::pow(outParticle.getMomentum().z, 2) +
-                          std::pow(outParticle.getMass(), 2));
 
     debug() << "" << endmsg;
     debug() << "~~~ BOOST ~~~" << endmsg;
@@ -92,7 +99,7 @@ StatusCode SimG4CrossingAngleBoost::execute() {
 
     debug() << "Particle:" << endmsg;
     debug() << "  - PDG ID: " << outParticle.getPDG() << endmsg;
-    debug() << "  - mass: " << outParticle.getMass() << endmsg;
+    debug() << "  - time: " << outParticle.getTime() << endmsg;
     debug() << "  - vertex: " << endmsg;
     debug() << "    - x: " << outParticle.getVertex().x << endmsg;
     debug() << "    - y: " << outParticle.getVertex().y << endmsg;
@@ -101,7 +108,6 @@ StatusCode SimG4CrossingAngleBoost::execute() {
     debug() << "    - px: " << outParticle.getMomentum().x << endmsg;
     debug() << "    - py: " << outParticle.getMomentum().y << endmsg;
     debug() << "    - pz: " << outParticle.getMomentum().z << endmsg;
-    debug() << "  - energy: " << eb << endmsg;
 
     outParticles->push_back(outParticle);
   }
diff --git a/SimG4Components/src/SimG4CrossingAngleBoost.h b/SimG4Components/src/SimG4CrossingAngleBoost.h
index c602955..07cc3f4 100644
--- a/SimG4Components/src/SimG4CrossingAngleBoost.h
+++ b/SimG4Components/src/SimG4CrossingAngleBoost.h
@@ -3,9 +3,12 @@
 
 // Gaudi
 #include "GaudiAlg/GaudiAlgorithm.h"
+#include "GaudiKernel/ToolHandle.h"
 
 // FCCSW
 #include "k4FWCore/DataHandle.h"
+#include "SimG4Interface/ISimG4SaveOutputTool.h"
+#include "SimG4Interface/ISimG4ParticleSmearTool.h"
 
 // datamodel
 namespace edm4hep {