U102: Lorentz Transformations

Author(s): V. Framery, L. Pape	Library: KERNLIB
Submitter:	Submitted: 01.03.1968
Language: Fortran	Revised: 16.09.1991

LORENF transforms the momentum 4-vector of a particle from the Lorentz-frame to the frame like LOREN4 (U101); it is faster than LOREN4 because the rest-mass M of is passed as an argument to save the square root.

LORENB executes the inverse transformation.

Structure:

SUBROUTINE subprograms
User Entry Names: LORENF, LORENB

Usage:

CALL LORENF(SM,SP,PB,PF) forward transformation PB -> PF

CALL LORENB(SM,SP,PF,PB) backward transformation PF -> PB

with

SM

Rest-mass M of system with .

SP

Momentum 4-vector (P,E) of in .

PB

Momentum 4-vector (p,e) in .

PF

Momentum 4-vector (p',e') in .

Method:

For LORENF (cf. LOREN4 (U101)):

because pP=eE-e'M and pP-e(E+M)=-M(e+e').

For LORENB: