ROOT   6.14/05 Reference Guide
Physics Vectors

The Physics Vectors classes.

Several documents describing these classes are listed below:

#### The Physics Vector package consists of five classes:

It is a combination of CLHEPs Vector package written by Leif Lonnblad, Andreas Nilsson and Evgueni Tcherniaev and a ROOT package written by Pasha Murat. for CLHEP see: http://www.cern.ch/clhep/

## Classes

class  TFeldmanCousins
Class to calculate the CL upper limit using the Feldman-Cousins method as described in PRD V57 #7, p3873-3889. More...

class  TGenPhaseSpace
Utility class to generate n-body event, with constant cross-section (default) or with Fermi energy dependence (opt="Fermi"). More...

class  TLorentzRotation
The TLorentzRotation class describes Lorentz transformations including Lorentz boosts and rotations (see TRotation) More...

class  TLorentzVector
TLorentzVector is a general four-vector class, which can be used either for the description of position and time (x,y,z,t) or momentum and energy (px,py,pz,E). More...

class  TQuaternion
Quaternion is a 4-component mathematic object quite convenient when dealing with space rotation (or reference frame transformation). More...

class  TRobustEstimator
Minimum Covariance Determinant Estimator - a Fast Algorithm invented by Peter J.Rousseeuw and Katrien Van Dreissen "A Fast Algorithm for the Minimum covariance Determinant Estimator" Technometrics, August 1999, Vol.41, NO.3. More...

class  TRolke
This class computes confidence intervals for the rate of a Poisson process in the presence of uncertain background and/or efficiency. More...

class  TRotation
The TRotation class describes a rotation of objects of the TVector3 class. More...

class  TVector2
TVector2 is a general two vector class, which can be used for the description of different vectors in 2D. More...

class  TVector3
TVector3 is a general three vector class, which can be used for the description of different vectors in 3D. More...