Hi, Sasha

   Thanks, the distributions are indeed very similar. Note that the ANL 
server keeps HERWIG++ ttbar samples, while the Nebraska server keeps 
MadGraph5+Pythia ttbar samples. But the fast simulation (Delphes3.06) 
and pileup samples should be the same.

  cheers, 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 04/29/2013 05:26 PM, Alexandre Khanov wrote:
> Hi Meena,
>
> I produced the plots for those samples as well:
>
> anl samples: http://hep0.okstate.edu/khanov/snowmass/ttbar/
> unl samples: http://hep0.okstate.edu/khanov/snowmass/ttbar1/
>
> there are subtle differences (e.g. a slight shift in HT, including the
> no pileup samples), but the PU dependence is pretty much the same for
> both samples.
>
> -- Regards, Sasha
>
>
> On Mon, 29 Apr 2013, 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:montecarl
>>
>>             o
>>
>>             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:montecarl
>>
>>                   o#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_FastSimulat
>>
>>
>> ion#Fast_Simulation_and_Pileup_strategy_-_the_Snowmass_detector
>>
>>                     best, Sergei
>>
>>
>>
>>
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>>
>>

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