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76X Jet pileup id ? #389

Closed azzurrip closed 8 years ago

azzurrip commented 8 years ago

Do we want to make sure to use 76X pu jet-id ? https://hypernews.cern.ch/HyperNews/CMS/get/jet-algorithms/383.html https://twiki.cern.ch/twiki/bin/view/CMS/PileupJetID#Information_for_13_TeV_data_anal https://indico.cern.ch/event/502737/contribution/3/attachments/1234291/1811331/PileupJetID_76X.pdf it should be much better than using the previous version. Guess this should go in central heppy right ?

bianchini commented 8 years ago

Ciao, any news about that? Can anybody look at it? We need the good pileup jet ID, because we do use it.

arizzi commented 8 years ago

I can have a look, would you prefer to replace the selection based on the new one or just add one more flag for puId76 ?

the example given foresee also jet-correction before the new ID but I think we can avoid that (as it would make the changes more invasive and more error prone)... in the end a 5% wrong pT should not affect much the PU ID ... isn't it? I mean the resolution is larger than the shift in response due to updated JECs

bianchini commented 8 years ago

ciao Andrea, great, thanks! Ideally, we would like to update the Higgs jet selection to this new jetID, and add puId76 for all the jets.. I am fine with not changing the jet energy before.. I am also puzzled, I thought this ID was working at the level of pfcandidates..

azzurrip commented 8 years ago

Yes great if we can replace it ! I think the previous one is really not working well (and limited to central jets). For low pT jets (say around 30 GeV or lower) the value of the pT is important to classify properly the jet (based on the internal composition). For this I guess is important not to use the raw pT as it can be significantly smaller than the corrected pT.

arizzi commented 8 years ago

is not raw anyhow, at most it is " Old JECs" Il 02/mar/2016 10:16, "azzurrip" notifications@github.com ha scritto:

Yes great if we can replace it ! I think the previous one is really not working well (and limited to central jets). For low pT jets (say around 30 GeV or lower) the value of the pT is important to classify properly the jet (based on the internal composition). For this I guess is important not to use the raw pT as it can be significantly smaller than the corrected pT.

— Reply to this email directly or view it on GitHub https://github.com/vhbb/cmssw/issues/389#issuecomment-191145666.

azzurrip commented 8 years ago

Ok fine then

arizzi commented 8 years ago

btw this will require migration to 763p2

bianchini commented 8 years ago

Ok. I am also struggling with the EGamma energy corrections that are also based on 763p2... Shall we give up?

arizzi commented 8 years ago

398 should implement the new PU ID

bianchini commented 8 years ago

@azzurrip: Paolo do you think we can close this issue? Is the new puId fine?

azzurrip commented 8 years ago

Yes very fine.

On 15 Mar 2016, at 15:30, bianchini notifications@github.com<mailto:notifications@github.com> wrote:

@azzurriphttps://github.com/azzurrip: Paolo do you think we can close this issue? Is the new puId fine?

— You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub: https://github.com/vhbb/cmssw/issues/389#issuecomment-196845734