Fix of the missing FXT vertex selection mode due to the version missmatch.

Author: nigmatkulov

StRoot/StPicoDstMaker/StPicoDstMaker.cxx

@@ -368,6 +368,18 @@ Int_t StPicoDstMaker::setVtxModeAttr(){
     LOG_INFO << " PicoVtxVpdOrDefault is being used " << endm;
     return kStOK;
   }
+  else if (strcasecmp(SAttr("PicoVtxMode"), "PicoVtxFXT") == 0) {
+    setVtxMode( PicoVtxMode::FXT );
+    LOG_INFO << " PicoVtxFXT is being used " << endm;
+    return kStOK;
+  }
+#if !defined (__TFG__VERSION__)
+  else if (strcasecmp(SAttr("PicoVtxMode"), "PicoVtxMtd") == 0) {
+    setVtxMode( PicoVtxMode::Mtd );
+    LOG_INFO << " PicoVtxMtd is being used " << endm;
+    return kStOK;
+  }
+#endif /* !__TFG__VERSION__ */
 
   return kStErr;
 }
@@ -2369,7 +2381,27 @@ bool StPicoDstMaker::selectVertex() {
     mMuDst->setVertexIndex(0);
     selectedVertex = mMuDst->primaryVertex();
   }
-  else if (mVtxMode == PicoVtxMode::Vpd || mVtxMode == PicoVtxMode::VpdOrDefault) {
+  else if ( mVtxMode == PicoVtxMode::FXT ) {
+    
+    // Loop over primary vertices
+    for (unsigned int iVtx = 0; iVtx < mMuDst->numberOfPrimaryVertices(); ++iVtx) {
+      
+      // Return pointer to i-th primary vertex
+      StMuPrimaryVertex* vtx = mMuDst->primaryVertex(iVtx);
+      if (!vtx) continue;
+      
+      // Check TpcVz and VpdVz difference
+      if (vtx->position().z() > 198. && vtx->position().z() < 202.) {
+	// Reset vertex index
+	mMuDst->setVertexIndex( iVtx );
+	// Reset pointer to the primary vertex
+	selectedVertex = mMuDst->primaryVertex();
+	// Quit vertex loop
+	break;
+      }
+    }
+  }
+  else if ( mVtxMode == PicoVtxMode::Vpd || mVtxMode == PicoVtxMode::VpdOrDefault ) {
 
     // For VpdOrDefault option one will take the first primary
     // vertex if no TOF or VPD information is available

StRoot/StPicoDstMaker/StPicoDstMaker.h

@@ -15,6 +15,11 @@
  *   c) Vpd - checks if BTof info is available then loops over primary
  *      vertices and checks if |Vz - VpdVz|<mTpcVpdVzDiffCut. The first
  *      vertex that satisfies the cut is selected.
+ *   d) Mtd - sets the first primary vertex as a default and then loops
+ *      over all primary vertices. The first one that has at least
+ *      2 MTD-matched primary tracks is selected.
+ *   e) FXT - set the first vertex that was reconstructed in z 
+ *      from 198 to 202 cm along z axis.
  * Default is NotSet. In this case the program execution will be terminated.
  * Has to be explicitly set.
  *
@@ -74,8 +79,14 @@ class StPicoDstMaker : public StMaker {
   /// Write/Read mode: 1-write, 2-read
   enum PicoIoMode {IoWrite=1, IoRead=2};
 #if !defined (__TFG__VERSION__)
-  /// Primary vertex selection mode: 0-NotSet, 1-Default, 2-Vpd, 3-VpdOrDefault
-  enum PicoVtxMode {NotSet=0, Default=1, Vpd=2, VpdOrDefault=3};
+  /// Primary vertex selection mode
+  /// \par 0 NotSet
+  /// \par 1 Default
+  /// \par 2 Vpd
+  /// \par 3 VpdOrDefault
+  /// \par 4 Mtd
+  /// \par 5 FXT
+  enum PicoVtxMode {NotSet=0, Default=1, Vpd=2, VpdOrDefault=3, Mtd=4, FXT=5};
 #endif /* ! __TFG__VERSION__ */
   /// Write or not write covariance matrix: 0-skip, 1-write
   enum PicoCovMtxMode {Skip=0, Write=1};
@@ -320,7 +331,7 @@ class StPicoDstMaker : public StMaker {
 
   /// Get CVS status
   virtual const char *GetCVS() const {
-    static const char cvs[]="Tag $Name:  $ $Id: StPicoDstMaker.h,v 1.26 2020/02/14 17:05:53 gnigmat Exp $ built " __DATE__ " " __TIME__ ;
+    static const char cvs[]="Tag $Name:  $ $Id: StPicoDstMaker.h,v 1.30 2021/02/23 17:27:01 gnigmat Exp $ built " __DATE__ " " __TIME__ ;
     return cvs;
   }