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• Ctq4Pdf.f : Fortran program to evaluate CTEQ4 parton distributions functions, using data tables in the following two packages;
  
  
• Ctq4TblAll.uu : uuencoded gzip file of all CTEQ4 PDF data tables listed below. (788898 bytes)
  
  
• Ctq4TblChm.uu : uuencoded gzip file of new CTEQ4 PDF data tables relating to Ref[2] below, including an improved version of CTEQ4HQ called CTEQ4HQ1. These pertain to charm mass effects. (230619 bytes)
  
  
• Ctq4F2.f : Fortran program to evaluate F₂(x,Q) and F₂^c(x,Q), using CTEQ4 parton distribution functions. Please read the extensive comment lines of the source code for a guide.

Ref[1]: "IMPROVED PARTON DISTRIBUTIONS FROM GLOBAL ANALYSIS OF RECENT DEEP INELASTIC SCATTERING AND INCLUSIVE JET DATA"
By: H.L. Lai, J. Huston, S. Kuhlmann, F. Olness, J. Owens, D. Soper W.K. Tung, H. Weerts
Phys. Rev. D55, 1280 (1997)

Ref[2]: "CHARM PRODUCTION AND PARTON DISTRIBUTIONS"
By: H.L. Lai and W.K. Tung
MSU-HEP-61222, CTEQ-622, e-Print Archive: hep-ph/9701256 to appear in Z. Phys. C (including a note added in proof describing CTEQ4HQ1, not in the preprint.)

This package contains 13 sets of CTEQ4 PDF's. Details are:

 Iset   PDF        Description       Alpha_s(Mz)  Lam4  Lam5   Table_File
---------------------------------------------------------------------------
Ref[1]
  1    CTEQ4M   Standard MSbar scheme   0.116     298   202    cteq4m.tbl
  2    CTEQ4D   Standard DIS scheme     0.116     298   202    cteq4d.tbl
  3    CTEQ4L   Leading Order           0.132     236   181    cteq4l.tbl
  4    CTEQ4A1  Alpha_s series          0.110     215   140    cteq4a1.tbl
  5    CTEQ4A2  Alpha_s series          0.113     254   169    cteq4a2.tbl
  6    CTEQ4A3            ( same as CTEQ4M )
  7    CTEQ4A4  Alpha_s series          0.119     346   239    cteq4a4.tbl
  8    CTEQ4A5  Alpha_s series          0.122     401   282    cteq4a5.tbl
  9    CTEQ4HJ  High Jet                0.116     303   206    cteq4hj.tbl
 10    CTEQ4LQ  Low Q0                  0.114     261   174    cteq4lq.tbl
---------------------------------------------------------------------------
Ref[2]
 11    CTEQ4HQ  Heavy Quark             0.116     298   202    cteq4hq.tbl
 12    CTEQ4HQ1 Heavy Quark:Q0=1,Mc=1.3 0.116     298   202    cteq4hq1.tbl
       (Improved version of CTEQ4HQ, recommended)
 13    CTEQ4F3  Nf=3 FixedFlavorNumber  0.106     (Lam3=385)   cteq4f3.tbl
 14    CTEQ4F4  Nf=4 FixedFlavorNumber  0.111     292   XXX    cteq4f4.tbl

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