fixed the index of the W

Author: jorindevandevis

Models/StandardModel/standardModel.py

@@ -156,7 +156,7 @@ def WMsqThermal(T: float) -> float:  # pylint: disable=invalid-name
 
         wBoson = Particle(
             name="W",
-            index=2,
+            index=6,
             msqVacuum=WMsqVacuum,
             msqDerivative=WMsqDerivative,
             msqThermal=WMsqThermal,