initial

Signed-off-by: Basil Bruhn <basil.bruhn@psi.ch>

CHANGES.html

@@ -0,0 +1,38 @@
+This is a list of changes to hpair.f since October 1998:
+
+May 8 2017: Reading in of Z decay width corrected.
+            (thanks to M. Muehlleitner)
+
+June 19 2015: Bug corrected for consistent calculation of LO cxn
+              (thanks to R. Gr"ober)
+
+June 12 2015:   Version 2.00: Major upgrade
+              - Inclusion of dim6 operators up to NLO according to
+
+   R.~Grober, M.~Muhlleitner, M.~Spira and J.~Streicher,
+   %``NLO QCD Corrections to Higgs Pair Production including Dimension-6
+   %Operators,''
+   arXiv:1504.06577 [hep-ph].
+
+                with the according extension of the input file (see the
+                comments at the beginning of the fortran file for
+                explanations).
+              - link to LHAPDF implemented
+              - alpha_s defined via alpha_s(M_Z) now instead of Lambda_5
+
+March 12 2012: - Modification of complex functions to today's fortran
+                 standards
+
+September 12 2007: - Link to MRST2001 PDFs corrected due to errorneous
+                     interchange of u and d. (thanks to M. Ciccolini)
+
+April 12 2005: - Link to CTEQ6 and MRST2001 PDFs
+                 (NGROUP = -1: CTEQ6    -2: MRST2001)
+
+July 18 2001 : - Addition of the cut EPSILON to input file for
+                 controlling instabilities at very large energies
+                 (thanks to Tao Han).
+
+January 13 1999 : - Improvement of the whole function RUNM including a
+                    change in the input strange mass (MSbar mass at Q=1 GeV)
+