PDFs for bbH process
The following PDF sets have been created using APFEL to re-evolve the
input set PDF4LHC15_nnlo_mc form 2GeV (below bottom threshold) using
the setting of the Yellow Report 4.
Specifically, the bottom (pole) mass is set to 4.58GeV and varied by 0.14GeV,
and the bottom threshold is set to the bottom mass and varied by a
factor of 2.
See also arXiv:1605.01733 for further details.
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- mb=4.58, μb=4.58 : central set
- mb=4.58, μb=2.29 : μb down variation
- mb=4.58, μb=9.16 : μb up variation
- mb=4.44, μb=4.58 : mb variation, fixed μb (recommended);
mb=4.44, μb=4.44 : mb variation, fixed μb/mb (alternative)
- mb=4.72, μb=4.58 : mb variation, fixed μb (recommended);
mb=4.72, μb=4.72 : mb variation, fixed μb/mb (alternative)
- mb=4.58, μb=4.58, αs(mZ)=0.1165 : αs down variation
- mb=4.58, μb=4.58, αs(mZ)=0.1195 : αs up variation
- μb=∞ : 4FS set (no bottom PDF)
bbX - X production through bottom quarks
A code for resumming large b-quark collinear logarithms keeping exact mb dependence
This code computes the production of X (=Higgs boson, ...) when it is produced through bottom quarks (i.e., assuming X couples only [mostly] to b-quarks).
It combines the fixed-order (4FS) results which include exact bottom mass dependence to the resummation of collinear b-mass logarithms through 5FS DGLAP evolution.
For Higgs production (bbH) we further include interference with top loop which is usually considered part of the bbH cross section.
References:
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The code will be available soon.