From powhegbox-announce at projects.hepforge.org Wed Sep 24 09:21:48 2014 From: powhegbox-announce at projects.hepforge.org (Announcement of new releases and important bug fixes (read-only, low volume)) Date: Wed, 24 Sep 2014 01:21:48 -0700 Subject: [Powhegbox-announce] Problem with LHAPDF6 Message-ID: Dear POWHEG-BOX users, we have noticed very recently a feature/bug in lhapdf v6 that clashes with the setting of the pdf set via a standard input card in POWHEG-BOX (the usual powheg.input file in subprocesses directories). Basically, with lhapdf v6, it can happen that the lhapdf library changes the pdf set used during the run. We believe this is a 'bug' of the fortran interface to lhapdf v6 (in particular the getq2min subroutine). A. Buckley (LHAPDF author) has been already contacted about this. We have also implemented a workaround in our code to minimise the risk of similar problems in the future, which is available since revision 2819. An announcement about this bug fix can also be found in the POWHEG BOX webpage http://powhegbox.mib.infn.it/release_bugs.txt If you have used POWHEG BOX (V1 or V2) with lhapdf v6, we would strongly suggest to re-perform those runs, in all cases, but especially if you have used also not just the central member of a pdf set (like for instance 21201 and not just 21200 in MSTW2008nnlo, or similarly for all other pdfs!) Best wishes, the authors -------------- next part -------------- An HTML attachment was scrubbed... URL: