This manual describes how to use the program
HiggsPt_R, which computes the Higgs boson
Transverse Momentum distribution at NLO in the
limit of large top quark mass, with input grid and output files for use
with the resummation program RESBOS.
The code produces two output files. The "xxx_Pert.out" output file displays
the order alpha_s^3 Pert_1 and order alpha_s^4 Pert_2 contributions to the
perturbative cross sections and the K factor (K=(Pert_1+Pert_2)/Pert_1)
as a function of the input grid variables.
The "xxx_Y.out" output file displays the order
alpha_s^3 Y_1 and order alpha_s^4 Y_2 contributions to
Y=sigma(exact)-sigma(small-pt) and the associated K factor
(K=(Y_1+Y_2)/Y_1) as a function of the input grid variables.
The manual gives
line-by-line instructions for the input file
"HiggsPt_R.indat".
It should be fairly easy to use the input file,
"HiggsPt_R.indat", just by modifying the example
that came with the source distribution. However, there are a few
general formatting requirements to be aware of.
The input file must have exactly 10 lines.
In the following explanations
of the inputs, a list {a, b, c} indicates a choice of string inputs
on a line, while an ordered list [x y z] indicates multiple numerical
parameters input on a single line. Possible inputs are colored
red.
If the input to a line
is a string, then it MUST have trailing white spaces after the string
(NOT TABS!). It is easiest to do this by keeping the explanatory
comment after the input string (i.e, white spaces followed by #x Comment)
from the example file.
Any input which is a string must be spelled exactly as given below,
including capitalization and without quotation marks, or else the program will
complain.
The program ignores anything in a line that comes after the expected input.
cteq6 :   | iset=1 : | CTEQ6M Standard MSbar scheme at NLO |
iset=3 : | CTEQ6L Leading Order with NLO running | |
iset=4 : | CTEQ6L1 Leading Order with LO running | |
iset=200 : | CTEQ6.1M (updated CTEQM) | |
iset=400 : | CTEQ6.6M (most recently updated CTEQM) | |
cteq5 : | iset=3 : | CTEQ5L Leading Order with LO running |
iset=8 : | CTEQ5M1 Standard MSbar scheme at NLO | |
mrst2004 : | mode=1 : | Best fit MSBAR at NLO |
mrst2002 : | mode=1 : | Best fit MSBAR at NLO |
mrst2001lo : | mode=1 : | Leading Order best fit |
mrst99 : | mode=1 : | COR01 central gluon, a_s (MSBAR at NLO) |
mode=2 : | COR02 higher gluon (MSBAR at NLO) |
Other choices of distributions in the cteq5, cteq6, and mrst99 series may also be called, but first a symbolic link must be made in the directory "main" to the relevant ".tbl", ".pds", or ".dat" file in the PDF directories. In particular, symbolic links to the 40 Cteq6.6 Error Matrix PDFs can be made by typing "make cteq6_error_PDFs" on the command line. For more info on PDF distributions, look at the comments in the file "Cincludes/pdfqcd07.h" or in the specific PDF code files in the directories "PDFs/Cteq6-2008", "PDFs/Cteq5" "PDFs/MRST99", "PDFs/MRST2001lo", "PDFs/MRST2002", and "PDFs/MRST2004".
MH : | muScale = M_H (Higgs Mass) |
MT : | muScale = M_T = sqrt(M_H^2+p_T^2) (Higgs Transverse Mass) |
Renormalization : | mu_R=chiR*muScale. | Factorization : | mu_F=chiF*muScale. |