--- PamCut/CommonDefs.h	2010/03/09 18:02:10	1.6
+++ PamCut/CommonDefs.h	2010/03/11 19:17:44	1.9
@@ -14,6 +14,9 @@
 /*! @brief The implementations of PamCut::Check() must return this value if the event satisfy the cut*/
 const int CUTOK = -1;
 
+const float POSITIVE = 1.0; ///< Positive sign alias
+const float NEGATIVE = -1.0; ///< Negative sign alias
+
 /*! @enum DETECTORCODE
  * The values for each detector correspond to a binary code associated to that detector.
  * These can be arithmetically added to create a binary code for a set of detectors.
@@ -47,6 +50,26 @@
  */
 const int TOFNPADLAYER[6] = { 8, 6, 2, 2, 3, 3 };
 
+/*! @var H_MASS
+ * Proton mass
+ */
+const float H_MASS = 0.93827203; // GeV (pdg.web.cern.ch)
+
+/*! @var HE4_MASS
+ * Helium 4 mass
+ */
+const float HE4_MASS = 3.7274; // GeV (http://hyperphysics.phy-astr.gsu.edu/Hbase/pertab/He.html)
+
+/*! @var HE3_MASS
+ * Helium 3 mass
+ */
+const float HE3_MASS = 2.8084; // GeV (http://hyperphysics.phy-astr.gsu.edu/Hbase/pertab/He.html)
+
+/*! @var E_MASS
+ * Electron mass
+ */
+const float E_MASS = 0.000510998; // GeV (from PDG)
+
 /*! @brief A simple matrix class.
  *
  *  This class defines a matrix built by STL vectors. It is basically a variable-dimension