[PWGDQ] Filling CosDeltaPhi in ME as in the past (AliceO2Group#10332)

Co-authored-by: Lucamicheletti93 <[email protected]>

Author: lucamicheletti93

PWGDQ/Core/VarManager.h

@@ -3121,8 +3121,10 @@ void VarManager::FillPairME(T1 const& t1, T2 const& t2, float* values)
     // Compute the scalar product UQ for two muon from different event using Q-vector from A, for second and third harmonic
     float Psi2A1 = getEventPlane(2, values[kQ2X0A1], values[kQ2Y0A1]);
     float Psi2A2 = getEventPlane(2, values[kQ2X0A2], values[kQ2Y0A2]);
+    values[kCos2DeltaPhi] = TMath::Cos(2 * (v12.Phi() - Psi2A1)); // WARNING: using the first event EP
     values[kCos2DeltaPhiEv1] = TMath::Cos(2 * (v1.Phi() - Psi2A1));
     values[kCos2DeltaPhiEv2] = TMath::Cos(2 * (v2.Phi() - Psi2A2));
+    values[kU2Q2] = values[kQ2X0A1] * TMath::Cos(2 * v12.Phi()) + values[kQ2Y0A1] * TMath::Sin(2 * v12.Phi()); // WARNING: using the first event EP
     values[kU2Q2Ev1] = values[kQ2X0A1] * TMath::Cos(2 * v1.Phi()) + values[kQ2Y0A1] * TMath::Sin(2 * v1.Phi());
     values[kU2Q2Ev2] = values[kQ2X0A2] * TMath::Cos(2 * v2.Phi()) + values[kQ2Y0A2] * TMath::Sin(2 * v2.Phi());