update default MC T0 value

Author: glegras

Detectors/TRD/simulation/include/TRDSimulation/Digitizer.h

@@ -14,6 +14,7 @@
 
 #include "TRDSimulation/Detector.h"
 
+#include "TRDBase/Geometry.h"
 #include "TRDBase/PadResponse.h"
 #include "TRDSimulation/DiffAndTimeStructEstimator.h"
 #include "TRDSimulation/PileupTool.h"

Detectors/TRD/simulation/include/TRDSimulation/SimParam.h

@@ -137,7 +137,7 @@ class SimParam
   float mTRFhi{3.58f};                                               ///<  Higher boundary of the TRF and x-talk
   float mInvTRFwid{static_cast<float>(mTRFbin) / (mTRFhi - mTRFlo)}; ///<  Inverse of the bin width of the integrated TRF and x-talk
   float mGasGain{4000.f};                                            ///< Gas gain
-  float mT0{0.145f};                                                 ///< time delay before amplification peak
+  float mT0{-0.130f};                                                ///< time delay before amplification peak
 
   float mEffVdriftDefault{1.22f}; ///< The CCDB contains an effective drift velocity, and not the true drift velocity, so we anchor only the variations. This default parameter is the one reproducing data the best for run 568191.
 

Detectors/TRD/simulation/include/TRDSimulation/TRDSimParams.h

@@ -41,7 +41,7 @@ struct TRDSimParams : public o2::conf::ConfigurableParamHelper<TRDSimParams> {
   int trf = 0;                  // Sampled TRF function. 0: default TRF, 1: TRF described in TRF TDR, 2: No TRF, 3: Landau dist as TRF (parameters specified below)
   float trf_landau_mu = 0.;     // Mu of the Landau distribution used to describe TRF
   float trf_landau_sigma = .03; // Sigma of the Landau distribution used to describe TRF
-  float t0 = 0.180;             // Time delay before start of amplification peak, in us
+  float t0 = -0.130;            // Time delay before start of amplification peak, in us
   O2ParamDef(TRDSimParams, "TRDSimParams");
 };