Modify ↓
Opened 12 years ago
Closed 11 years ago
#241 closed defect (fixed)
Running lepton masses run with alphaS
| Reported by: | Frank Krauss | Owned by: | Steffen Schumann |
|---|---|---|---|
| Priority: | major | Milestone: | rel-2.0.0 |
| Component: | Unknown | Version: | 1.4.0 |
| Keywords: | Cc: |
Description
In Standard_Model.C the running lepton masses are initialized with as as coupling. We should do running aqed.
Attachments (0)
Change History (5)
comment:1 Changed 12 years ago by
comment:3 Changed 12 years ago by
You are of course right, however just changing aS to aQED won't do the job as obviously for non-QCD running the coefficients are different. Is there a clear physics case for having runing lepton masses? Otherwise I would rather prefer to disable them entirely.
comment:4 Changed 12 years ago by
| Milestone: | → rel-2.0.0 |
|---|
comment:5 Changed 11 years ago by
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
Lepton masses are not running. Quark mass running is now implemented up to 3-loop order, including the pole -> MSbar mass shift.
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As far as I can see in Running_Fermion_Mass.C the alphaS argument is needed to infer the number of active flavours from it, as well as the value of alphaS at the desired scale in the operator for this QCD loop effect. So to me everything seems consistent.
Steffen