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[Rivet] OPAL_2004_S6132243Andy Buckley andy.buckley at ed.ac.ukFri Nov 11 12:41:37 GMT 2011
Good suggestion Peter: I'll take a look in the projection that constructs that observable. I don't remember adding a per-side multiplicity check when I wrote it... And with 100k events I do reproduce the issue... damn, I thought that 10k was enough to be confident! $ grep -i nan Rivet.aida <measurement value="-nan" errorPlus="-nan" errorMinus="-nan"/> <measurement value="-nan" errorPlus="-nan" errorMinus="-nan"/> <measurement value="-nan" errorPlus="-nan" errorMinus="-nan"/> <measurement value="-nan" errorPlus="-nan" errorMinus="-nan"/> <measurement value="-nan" errorPlus="-nan" errorMinus="-nan"/> Thanks again, Andy On 11/11/11 07:16, Peter Skands wrote: > Hi Andy, > > I was just wondering. ML is normally a 4-jet quantity, i.e., it is > undefined (zero) for 3 particles or less. It may even be undefined for 4 > partons, since it needs at least 2 of the partons to be on the "light" > hemisphere which is not always the case. I don't know exactly how you > compute the moments, but is it possible that something bad happens if > there is an event with too few particles in the light hemisphere? That > could conceivably happen only very rarely. > > Peter > > On 11/10/11 11:22 PM, Anton Karneyeu wrote: >> Hi Andy, >> I made a recheck with 1.7.0beta0 and still can see the problem - see >> attached >> pdf. Did you tried on lxplus? >> >> The full output which I see and script is here: >> >> /afs/cern.ch/user/a/akorneev/public/rivet >> >> Maybe something is wrong with my environment but I see the same issue in >> histograms coming from our BOINC cluster which are SLC5 i686 machines >> with >> minimal environment. Also, problem do not appear running small number >> of events, >> at least 100k events are necessary (probably it depends on random seed). >> >> Cheers, >> Anton >> >> >> On 10.11.2011 16:53, Andy Buckley wrote: >>> Hi Anton, >>> >>> Sorry about the delay, but with the trunk version of Rivet I don't see >>> any issue with these plots. I ran the PYTHIA default tune at 91 GeV and >>> your z2.params which specifies 133 GeV, and both worked fine. No NaNs in >>> any of the output files, and the plots look very reasonable (see >>> attached). >>> >>> Do you still see this issue with the 1.7.0beta0 version? We do now also >>> have a beta1 tarball available, but unless you found any problems in the >>> beta0 testing I think we are ready to make our proper 1.7.0 release >>> tomorrow. >>> >>> Cheers, >>> Andy >>> >>> >>> On 06/10/11 21:19, Anton Karneyeu wrote: >>>> Hi guys, >>>> >>>> could you have a look on OPAL_2004_S6132243 analysis there is a problem >>>> with HemiMassLMom (d25-x01-yYY) histogram. In some cases histogram bins >>>> contents NaNs. >>>> >>>> Please, find in attachment the script which reproduce the problem on >>>> lxplus: >>>> >>>> $ ssh lxplus >>>> $ ./bug.sh >>>> >>>> Problematic histogram is >>>> >>>> S6132243/OPAL_2004_S6132243/d25-x01-y02.{dat,pdf,png} >>>> >>>> >>>> Cheers, >>>> Anton >>>> >>>> >>>> _______________________________________________ >>>> Rivet mailing list >>>> Rivet at projects.hepforge.org >>>> http://www.hepforge.org/lists/listinfo/rivet >>> >>> > -- Dr Andy Buckley SUPA Advanced Research Fellow Particle Physics Experiment Group, University of Edinburgh The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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