#include "TF1.h"
#include "TLinearFitter.h"
+#include "AliExternalTrackParam.h"
+
//
// includes neccessary for test functions
//
Double_t kp4,
Double_t kp5) {
//
- // This is the ALEPH parameterisation of the Bethe-Bloch formula
+ // This is the empirical ALEPH parameterization of the Bethe-Bloch formula.
+ // It is normalized to 1 at the minimum.
+ //
+ // bg - beta*gamma
+ //
+ // The default values for the kp* parameters are for ALICE TPC.
+ // The returned value is in MIP units
//
- Double_t beta = bg/TMath::Sqrt(1.+ bg*bg);
-
- Double_t aa = TMath::Power(beta,kp4);
- Double_t bb = TMath::Power(1./bg,kp5);
-
- bb=TMath::Log(kp3+bb);
-
- return (kp2-aa-bb)*kp1/aa;
+ return AliExternalTrackParam::BetheBlochAleph(bg,kp1,kp2,kp3,kp4,kp5);
}