On May 7, 2013, at 10:53 AM, James F Hirschauer wrote:
> 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
>>>>
>>>
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>