[Rivet] Overriding settings of pytune

[Andy Buckley]

Hi James... sounds like PYTHIA to me: I'm 95% sure that we don't treat 
any processes different from each other in the AGILe PYTHIA interface. A 
bit too busy to explicitly check right now though, I'm afraid!

Andy


On 01/03/12 14:55, James Monk wrote:
> Hi, (this is an AGILe-related question, but the AGILe list doesn't see much action these days)
>
> I'm running Perugia 2011 by calling pytune with 350, but then trying to override the PDF to use LHAPDF instead of the internal set.  Parameters are:
>
> #Turn on Perugia 2011
> MSTP(5) 350
> # Set CTau cut on (default to 10mm from PARJ(71))
> MSTJ(22) 2
>
> #set PDF to CTEQ 5L
> MSTP(51) 19070
> # Use LHAPDF
> MSTP(52) 2
>
> The problem is, in some cases it still attempts to use the internal PDF set number (7), but from LHAPDF.  This obviously doesn't work.  As far as I can tell, the determining factor is whether or not I set a particular process, or just use the default QCD process.  If I don't set a process then it uses the proper LHAPDF set number.  If I set a process then it tries to use the PDF set number of 7 from the tune.
>
> Any ideas?  Could this be an internal Pythia problem, rather than an AGILe one?
>
> cheers,
>
> James
>
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>
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-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh

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