#129 closed task (fixed)
Use LHAPDF routine for alpha_s if available
| Reported by: | kilian | Owned by: | kilian |
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| Priority: | P1 | Milestone: | |
| Component: | interfaces | Version: | 2.0.0beta |
| Severity: | minor | Keywords: | |
| Cc: |
Description
LHAPDF comes with its own alpha_s routine that is taylored for use with the selected PDF set. WHIZARD should be able to use this routine in place of its own alpha_s formula, if requested.
Change History (8)
comment:1 Changed 14 years ago by
| Component: | configure → interfaces |
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| Status: | new → assigned |
| Type: | defect → task |
comment:2 Changed 14 years ago by
| Version: | 2.0rc1 → 2.0beta |
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comment:3 Changed 14 years ago by
comment:5 Changed 14 years ago by
| Resolution: | → fixed |
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| Status: | assigned → closed |
in [1521]: If LHAPDF is not available, an error is issued and alpha_s_from_lhapdf reset to false.
comment:6 Changed 14 years ago by
| Resolution: | fixed |
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| Status: | closed → reopened |
What is not yet tackled is the following: using running alpha_s from LHAPDF, when no PDFs are used, but LHAPDF is linked (pathological case, but there are users who will do that). There should be a warning message issued about this at least, if not a default initialization could be taken for the case that no initialization has been done already. I don't know whether the latter point is technically possible. Since this is a quick one for WK, I leave it P1.
comment:7 Changed 14 years ago by
| Resolution: | → fixed |
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| Status: | reopened → closed |
There is now [1554] a global status for LHAPDF that enforces initialization if and only if it is required, in particular when using alpha-s without structure functions. Checks work correctly.
The only thing to be done here, is a warning message, that if using this option without using PDFs (which somehow does not make sense) results in zero alpha_s because the PDF has not been initialized.