Bug fix (T. Virgili, D. Elia)

diff --git a/ITS/AliITSMultReconstructor.cxx b/ITS/AliITSMultReconstructor.cxx
index bef5d289a100c317a9d3f14c99844c6e7d1370e6..07cd5001c49b55e6c97410098d14b1df80444304 100644 (file)
--- a/ITS/AliITSMultReconstructor.cxx
+++ b/ITS/AliITSMultReconstructor.cxx
@@ -361,9 +361,15 @@ AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t*
       fTracklets[fNTracklets][0] = fClustersLay1[iC1][0];
       // use the phi from the clusters in the first layer
       fTracklets[fNTracklets][1] = fClustersLay1[iC1][1];
-      // Store the difference between phi1 and phi2
+      // store the difference between phi1 and phi2
       fTracklets[fNTracklets][2] = fClustersLay1[iC1][1] - fClustersLay2[iC2WithBestDist][1];
 
+      // define dphi in the range [0,pi] with proper sign (track charge correlated)
+      if (fTracklets[fNTracklets][2] > TMath::Pi()) 
+          fTracklets[fNTracklets][2] = fTracklets[fNTracklets][2]-2.*TMath::Pi();
+      if (fTracklets[fNTracklets][2] < -TMath::Pi()) 
+          fTracklets[fNTracklets][2] = fTracklets[fNTracklets][2]+2.*TMath::Pi();
+
       // find label
       // if equal label in both clusters found this label is assigned
       // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned