 |
 |
Hi Sasha, Thanks for your nice slides from last week's April 30 meeting: https://indico.cern.ch/getFile.py/access?contribId=7&resId=0&materialId=slides&confId=249529 You show an obvious difference between MET and HT computed by Delphes and MET and HT computed from selected leptons and jets with pT>25 GeV and |eta|<2.4. Have you tried loosening the jet selection? Your eta and pT requirements are removing much of the neutral pileup energy that is going into the MET sum on slide 3. Delphes is not applying any neutral PU correction to the MET sum (I am talking to the authors about testing this), but Delphes does correct for clustered neutral PU in the HT sum. Best, Jim On Apr 29, 2013, at 8:40 AM, Meenakshi Narain wrote: > Hi Sasha, > > Can you also look at some of the ttbar files at > http://red-gridftp11.unl.edu/Snowmass/Delphes-3.0.6.1/ > > there are 13 and 33 TeV samples, with 0, 50 and 140 Pileup. > I believe in these samples, the pileup files are different from those which > Sergei used. If would be a good to have feedback. For the 0 and 50 PU, the > ttbar are about a few Million events. 140 PU the stats is much lower. > > in addition to ttbar there are also many other background samples. > > Regards, > Meenakshi > > > > > > On Apr 29, 2013, at 1:13 AM, Alexandre Khanov <[log in to unmask]> wrote: > >> Hi Sergei, >> >> thanks, it's working now. I looked at available ttbar samples and made some plots: >> >> http://hep0.okstate.edu/khanov/snowmass/ttbar/ >> >> Could you please take a look and see if they make sense to you? I'm particularly concered about the MET and HT distributions. MET (second column) changes a lot from 0 to 50 to 140 PU. HT (third column) is almost the same for 0 and 50 PU but changes dramatically from 50 to 140 PU. What particularly worries me is that if I just calculate the sum of selected leptons and jets' transverse momenta (columns 4,5) I don't see any big PU dependence. Is it expected? >> >> -- Regards, Sasha >> >> >> On Mon, 29 Apr 2013, Sergei Chekanov wrote: >> >>> >>> Hi, Sasha >>> >>> Today I was copying new Delphes files, this could case this glitch. It works now. >>> >>> Here are recent updates for: >>> >>> >>> https://atlaswww.hep.anl.gov/asc/wikidoc/doku.php?id=snowmass2013:montecarlo >>> >>> 1) Corrected truth particles for all top samples (now we store all muons, electrons, taus, bosons and exotic particles, i.e. Z') >>> >>> 2) New Pythia8 sample for Higgs+ttbar >>> >>> 3) Explained how to read Delphes output without installing ROOT >>> >>> best, Sergei >>> >>> Sergei Chekanov | WWW : www.hep.anl.gov/chakanau >>> =============== | Email: [log in to unmask] >>> HEP Division, ANL | Tel : +01-630-252 6541 >>> 9700 S.Cass,Argonne,IL 60439,USA | Fax : +01-630-252-5782 >>> >>> On 04/28/2013 06:25 PM, Alexandre Khanov wrote: >>>> Hi Sergei, >>>> the samples were there this morning but now I'm not able to access them: >>>> http://atlaswww1.hep.anl.gov/asc/snowmass2013/delphes36/ttbar/mu0/ >>>> Not Found >>>> The requested URL /asc/snowmass2013/delphes36/ttbar/mu0/ was not found >>>> on this server. >>>> Are you moving the samples around or there is a problem with the server? >>>> -- Regards, Sasha >>>> Sergei Chekanov wrote: >>>> Dear all, >>>> >>>> There are a few MC samples with ttbar available for testing: >>>> https://atlaswww.hep.anl.gov/asc/wikidoc/doku.php?id=snowmass2013:montecarlo#monte_carlo_samples_using_the_snowmass_detector >>>> >>>> (low pT ttbar, high pT ttbar and Zprime(3TeV)->ttbar for mu=0,50,140). >>>> >>>> The samples were generated using the Snowmass Combined LHC detector: >>>> http://www.snowmass2013.org/tiki-index.php?page=Energy_Frontier_FastSimulation#Fast_Simulation_and_Pileup_strategy_-_the_Snowmass_detector >>>> >>>> best, Sergei >>> >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the SNOWMASS-TOP list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=SNOWMASS-TOP&A=1 > ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the SNOWMASS-TOP list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=SNOWMASS-TOP&A=1