[Common] kCSPEED -> o2::constants (AliceO2Group#9408)

Author: njacazio

ALICE3/TableProducer/alice3-pidTOF.cxx

@@ -123,7 +123,7 @@ struct ALICE3pidTOFTask {
     if (!track.hasTOF()) {
       return -999.f;
     }
-    return ((track.trackTime() - track.collision().collisionTime()) * 1000.f - o2::pid::tof::ExpTimes<Trks::iterator, id>::ComputeExpectedTime(track.tofExpMom() / o2::pid::tof::kCSPEED,
+    return ((track.trackTime() - track.collision().collisionTime()) * 1000.f - o2::pid::tof::ExpTimes<Trks::iterator, id>::ComputeExpectedTime(track.tofExpMom() * o2::constants::physics::invLightSpeedCm2PS,
                                                                                                                                                track.length())) /
            sigma<id>(track);
   }
@@ -294,7 +294,7 @@ struct ALICE3pidTOFTaskQA {
       //
       // histos.fill(HIST("event/tofsignal"), t.p(), t.tofSignal());
       histos.fill(HIST("event/tofsignal"), t.p(), tofSignal);
-      histos.fill(HIST("event/pexp"), t.p(), t.tofExpMom() / o2::pid::tof::kCSPEED);
+      histos.fill(HIST("event/pexp"), t.p(), t.tofExpMom() * o2::constants::physics::invLightSpeedCm2PS);
       histos.fill(HIST("event/eta"), t.eta());
       histos.fill(HIST("event/length"), t.length());
       histos.fill(HIST("event/pt"), t.pt());

Common/Core/PID/PIDTOF.h

@@ -41,8 +41,6 @@ namespace o2::pid::tof
 {
 
 // Utility values (to remove!)
-static constexpr float kCSPEED = TMath::C() * 1.0e2f * 1.0e-12f; /// Speed of light in TOF units (cm/ps)
-static constexpr float kCSPEDDInv = 1.f / kCSPEED;               /// Inverse of the Speed of light in TOF units (ps/cm)
 static constexpr float defaultReturnValue = -999.f;              /// Default return value in case TOF measurement is not available
 
 /// \brief Class to handle the the TOF detector response for the TOF beta measurement

PWGLF/TableProducer/Nuspex/ebyeMaker.cxx

@@ -708,7 +708,7 @@ struct ebyeMaker {
         double expSigma{expBethe * cfgBetheBlochParams->get(iP, "resolution")};
         auto nSigmaTPC = static_cast<float>((track.tpcSignal() - expBethe) / expSigma);
 
-        float beta{track.hasTOF() ? track.length() / (track.tofSignal() - track.tofEvTime()) * o2::pid::tof::kCSPEDDInv : -999.f};
+        float beta{track.hasTOF() ? track.length() / (track.tofSignal() - track.tofEvTime()) * o2::constants::physics::invLightSpeedCm2PS : -999.f};
         beta = std::min(1.f - 1.e-6f, std::max(1.e-4f, beta));
         float mass{track.tpcInnerParam() * std::sqrt(1.f / (beta * beta) - 1.f)};
         bool hasTof = track.hasTOF() && track.tofChi2() < 3;

PWGLF/Tasks/Nuspex/antidLambdaEbye.cxx

@@ -636,7 +636,7 @@ struct antidLambdaEbye {
         double expSigma{expBethe * config.cfgBetheBlochParams->get(iP, "resolution")};
         auto nSigmaTPC = static_cast<float>((track.tpcSignal() - expBethe) / expSigma);
 
-        float beta{track.hasTOF() ? track.length() / (track.tofSignal() - track.tofEvTime()) * o2::pid::tof::kCSPEDDInv : -999.f};
+        float beta{track.hasTOF() ? track.length() / (track.tofSignal() - track.tofEvTime()) * o2::constants::physics::invLightSpeedCm2PS : -999.f};
         beta = std::min(1.f - 1.e-6f, std::max(1.e-4f, beta));
         float mass{track.tpcInnerParam() * std::sqrt(1.f / (beta * beta) - 1.f)};
         bool hasTof = track.hasTOF() && track.tofChi2() < 3;