PDF/spdf/hmrsgeb.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.2  1996/10/30 08:28:49  cernlib
   6 * Version 7.04
   7 *
   8 * Revision 1.1.1.1  1996/04/12 15:29:24  plothow
   9 * Version 7.01
  10 *
  11 *
  12 #include "pdf/pilot.h"
  13 C-----------------------------------------------------------------------
  14       SUBROUTINE HMRSGEB(X,SCALE,MODE,UPV,DNV,SEA,STR,CHM,BOT,GL)
  15 C***************************************************************C
  16 C                                                               C
  17 C            -----  VARIABLE GLUONS  ----                       C
  18 C                                                               C
  19 C     NEW VERSIONS !!!! JANUARY 1990  (AS DESCRIBED IN          C
  20 C     "PARTON DISTRIBUTIONS ... " P.N. HARRIMAN, A.D. MARTIN,   C
  21 C     R.G. ROBERTS AND W.J. STIRLING PREPRINT DTP-90-04 )       C
  22 C                                                               C
  23 C  MODE 1 CORRESPONDS TO  HARRIMAN,                             C
  24 C  MARTIN, ROBERTS, STIRLING (EMC FIT)    WITH LAMBDA= 100 MEV  C
  25 C  AND XG --> CONSTANT AS X--> 0 AT Q0**2                       C
  26 C                                                               C
  27 C  MODE 2 CORRESPONDS TO  HARRIMAN,                             C
  28 C  MARTIN, ROBERTS, STIRLING (EMC FIT)    WITH LAMBDA= 100 MEV  C
  29 C  AND XG --> X**0.5   AS X--> 0 AT Q0**2                       C
  30 C                                                               C
  31 C  MODE 3 CORRESPONDS TO  HARRIMAN,                             C
  32 C  MARTIN, ROBERTS, STIRLING (EMC FIT)    WITH LAMBDA= 100 MEV  C
  33 C  AND XG --> X**-0.5  AS X--> 0 AT Q0**2                       C
  34 C                                                               C
  35 C  MODE 4  CORRESPONDS TO HARRIMAN,                             C
  36 C  MARTIN, ROBERTS, STIRLING (BCDMS FIT)  WITH LAMBDA= 190 MEV  C
  37 C  AND XG --> CONSTANT AS X--> 0 AT Q0**2                       C
  38 C                                                               C
  39 C                                                               C
  40 C                                                               C
  41 C                         -*-                                   C
  42 C                                                               C
  43 C    (NOTE THAT X TIMES THE PARTON DISTRIBUTION FUNCTION        C
  44 C    IS RETURNED I.E. G(X) = GLU/X ETC, AND THAT "SEA"          C
  45 C    IS THE LIGHT QUARK SEA I.E. UBAR(X)=DBAR(X)                C
  46 C    = SEA/X FOR A PROTON.  IF IN DOUBT, CHECK THE              C
  47 C    MOMENTUM SUM RULE! NOTE ALSO THAT SCALE=Q IN GEV)          C
  48 C                                                               C
  49 C                         -*-                                   C
  50 C                                                               C
  51 C     (THE RANGE OF APPLICABILITY IS CURRENTLY:                 C
  52 C     10**-5 < X < 1  AND  5 < Q**2 < 1.31 * 10**6              C
  53 C     HIGHER Q**2 VALUES CAN BE SUPPLIED ON REQUEST             C
  54 C     - PROBLEMS, COMMENTS ETC TO WJS@UK.AC.DUR.HEP             C
  55 C                                                               C
  56 C                                                               C
  57 C***************************************************************C
  58 #include "pdf/impdp.inc"
  59       IF(MODE.EQ.1) CALL STRH3E(X,SCALE,UPV,DNV,SEA,STR,CHM,BOT,GL)
  60       IF(MODE.EQ.2) CALL STRH3EP(X,SCALE,UPV,DNV,SEA,STR,CHM,BOT,GL)
  61       IF(MODE.EQ.3) CALL STRH3EM(X,SCALE,UPV,DNV,SEA,STR,CHM,BOT,GL)
  62       IF(MODE.EQ.4) CALL STRH3B(X,SCALE,UPV,DNV,SEA,STR,CHM,BOT,GL)
  63       RETURN
  64       END