*
* $Id: lepto63.lis,v 1.1.1.1 1996/03/08 17:40:17 mclareni Exp $
*
* $Log: lepto63.lis,v $
* Revision 1.1.1.1  1996/03/08 17:40:17  mclareni
* Lepto63
*
*
C######################################################################C
C                                                                      C
C  The Lund Monte Carlo for Deep Inelastic Lepton-Nucleon Scattering   C
C                                                                      C
C                          L E P T O                                   C
C                                                                      C
C                 version 6.3,  July 17, 1995                          C
C   Authors:                                                           C
C   Gunnar Ingelman, DESY theory group     Dept. of Radiation Sciences C
C                    (room 202  bldg 2a)   Uppsala University          C
C                    D-22603 Hamburg, FRG  S-751 21 Uppsala, Sweden    C
C               phone: +49(40)8998-2795    +46(18)18-3884              C
C                 fax:            -2777             -3833              C
C              e-mail: ingelman@desy.de    (ingelman@tsl.uu.se)        C
C   Johan Rathsman, Dept. of Radiation Sciences, rathsman@tsl.uu.se    C
C   Anders Edin, Dept. of Radiation Sciences, edin@tsl.uu.se           C
C                                                                      C
C   Contributions on parton cascades: M. Bengtsson, T. Sjostrand       C
C                                                                      C
C   Availability: on request or from DESY IBM and VAX/VMS systems:     C
C   DESY IBM library      VXDESY directory         content             C
C   T00ING.LUND(member)   DISK$T__:[INGELMAN.LUND]                     C
C              LEPTOINF            LEPTO.INFO      info, news, updates C
C              LEPTOPS             LEPTO.PS        manual, post script C
C              LEPTO63             LEPTO63.FOR     source code         C
C              LEPTODEM            LEPTODEM.FOR    demo program        C
C                                  LEPTODEM.COM    demo command file   C
C   T00ING.OBJECT(LEPTO63)         LEPTO63.OBJ     object code         C
C                                                                      C
C   Manual: see file above (DESY preprint in preparation), see also    C
C           G. Ingelman, Uppsala preprint TSL/ISV 92-0065 and in       C
C           "Physics at HERA", Eds. W. Buchmueller, G. Ingelman,       C
C           DESY Hamburg 1992, vol. 3, p. 1366                         C
C                                                                      C
C   Please report any problems or suggestions for improvements.        C
C                                                                      C
C######################################################################C


Updates/changes in the present version
--------------------------------------

Compared to LEPTO 6.1 the changes/updates are:

-  Introduced non-zero lepton mass in kinematical formulae used. 
-  New default value of $sin^2\theta_W$, see PARL(5).
-  Uupdate of parton density parametrisations, see LST(15)and LST(16).
-  Introduced option to simulate scattering on intrinsic charm 
   quarks, see LST(15).
-  Additional options, and new default, for use of grid to store 
   probabilities for $qg$- and $q\bar{q}$-events, see LST(19).
-  Additional options for applying cut-offs against divergences in QCD 
   matrix elements, see LST(20).
-  New default values for QCD matrix element cutoffs PARL(8) and PARL(9).
-  New parameter PARL(10) for parton showers added on ME.
-  Additional options of maximum virtuality for parton showers, see LST(9).
-  Additional options, and new default, for treatment of the nucleon 
   target remnant, see LST(14).
-  Internal flag previously in LST(20) moved to LST(32), PARL(20) removed.
-  Changed PY... to LY... in routine and common block names to avoid 
   name clashes with {\sc Pythia}.
-  Corrected bug in treatment of azimuthal angle dependence in first order
   QCD matrix elements. 

Compared to LEPTO 6.2 the changes/updates are:

-  New treatment of sea quarks in the target remnant, see section 2.7 
   and LST(35).
-  Implemented a model for soft colour interactions (SCI) \cite{SCI},  as 
   a mechanism to understand rapidity gap events, see section 2.8 and  
   LST(34), PARL(7).
-  New default values for PARL(8),PARL(9),PARL(10) and PYPAR(22) in 
   connection with having SCI as default.  
-  Corrected a few bugs. 
-  Modified routines are LEPTOD, LINIT, LEPTO, LKINEM, LFRAME,
   LSHOWR, LMEPS, LYSSPA. New routines are LSCI, LECSWI, LEASWI.
   (To get the new physics introduced, it is also possible to use 
   LEPTO version 6.2 and replacing LEPTOD, LEPTO, LYSSPA and 
   adding LSCI, LECSWI, LEASWI from version 6.3.) 

