From 42f9d8414c7b6501b45a593f9e5d70054dc9af41 Mon Sep 17 00:00:00 2001
From: Justin Vega <31111402+vegajustin26@users.noreply.github.com>
Date: Tue, 30 Nov 2021 09:56:05 -0500
Subject: [PATCH] phiprojder bug fix (#116)

---
 .../TrackFindingTracklet/src/TrackletCalculatorDisplaced.cc     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/L1Trigger/TrackFindingTracklet/src/TrackletCalculatorDisplaced.cc b/L1Trigger/TrackFindingTracklet/src/TrackletCalculatorDisplaced.cc
index 56fd768ef6163..f66c49613982e 100644
--- a/L1Trigger/TrackFindingTracklet/src/TrackletCalculatorDisplaced.cc
+++ b/L1Trigger/TrackFindingTracklet/src/TrackletCalculatorDisplaced.cc
@@ -1826,7 +1826,7 @@ void TrackletCalculatorDisplaced::approxprojdisk(double halfRinv,
   // double C_0 = -d0_0 * halfRinv_0;
 
   phiproj = phi0 - A + B * (1 + C - 2 * A_0 * A_0) + sixth * pow(-A_0 + B_0, 3);
-  phiprojder = -halfRinv / t - d0 * t * t * zmeanInv * zmeanInv;
+  phiprojder = -halfRinv / t + d0 * t * zmeanInv * zmeanInv;
 
   phiproj = angle0to2pi::make0To2pi(phiproj);