This commit was generated by cvs2svn to compensate for changes in r165,

[u/mrichter/AliRoot.git] / RALICE / AliBoost.h

diff --git a/RALICE/AliBoost.h b/RALICE/AliBoost.h
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+#ifndef ALIBOOST_H
+#define ALIBOOST_H
+///////////////////////////////////////////////////////////////////////////
+// Class AliBoost
+// Perform various Lorentz transformations.
+//
+// Example :
+// =========
+//
+// Float_t a[3]={0.1,0.2,0.3};
+// Ali3Vector beta;
+// beta.SetVector(a,"car");
+//
+// AliBoost b1;
+// b1.SetBeta(beta);
+// cout << " Boost b1 :" << endl;
+// b1.Info();
+//
+// Float_t b[4]={14,1,2,3};
+// Ali4Vector p;
+// p.SetVector(b,"car");
+// Ali4Vector pprim=b1.Boost(p);
+// cout << " Boost b1 result p,pprim :" << endl;
+// p.Info();
+// pprim.Info();
+//
+// p=b1.Inverse(pprim);
+// cout << " Inverse b1 result pprim,p :" << endl;
+// pprim.Info();
+// p.Info();
+//
+// Float_t c[4]={5,0,0,4};
+// Ali4Vector q;
+// q.SetVector(c,"car");
+//
+// AliBoost b2;
+// b2.Set4Momentum(q);
+// cout << " Lorbo b2 : " << endl;
+// b2.Info("sph");
+//
+//--- NvE 14-may-1996 UU-SAP Utrecht
+//--- Modified : NvE 01-apr-1999 UU-SAP Utrecht using Ali3Vector/Ali4Vector
+///////////////////////////////////////////////////////////////////////////
+ 
+#include <iostream.h>
+#include <math.h>
+ 
+#include "TObject.h"
+
+#include "Ali4Vector.h" 
+
+class AliBoost : public TObject
+{
+ public:
+  AliBoost();                             // Default constructor
+  ~AliBoost();                            // Default destructor
+  void SetBeta(Ali3Vector b);             // Set boost parameters by beta 3-vector
+  void SetGamma(Double_t g,Ali3Vector v); // Set boost parameters by gamma and direction 3-vector
+  void Set4Momentum(Ali4Vector& p);       // Set boost parameters by 4-momentum
+  Ali3Vector GetBetaVector();             // Provide the beta 3-vector
+  Double_t GetBeta();                     // Provide norm of beta 3-vector
+  Double_t GetGamma();                    // Provide gamma value
+  void Info(TString f="car");             // Print boost parameter info in coord. frame f
+  Ali4Vector Boost(Ali4Vector& v);        // Perform Lorentz boost on 4-vector v
+  Ali4Vector Inverse(Ali4Vector& v);      // Perform inverse Lorentz boost on 4-vector v
+ 
+ protected:
+  Ali3Vector fBeta; // The beta 3-vector
+  Double_t fBeta2;  // beta**2
+  Double_t fGamma;  // The gamma factor
+ 
+ ClassDef(AliBoost,1) // Class definition to enable ROOT I/O
+};
+#endif