Presentation draft

[YasuyukiOkumura]

Dear all,

I prepared a presentation draft for Tuesday meeting. The focus of the talk is to show the analysis machinery has been set and we started monitoring the data, rather than speaking things to be understood (we are too premature to speak up yet).

http://hep.uchicago.edu/~okumura/works/pics/20150815/yasuyuki.okumura.20150814.00.pdf

p2 : summary of sample p3 : summary of object definition / summary of MC calibration p4/5 : summary of selection criteria and cut flow p6/7 : Z kinematics plot after preselection (referred in p4, including leading jets cut) p8 : leading jet kinematics plot after preselection p9 : leading jet pT after full selection applied except for b-tag p10/11 : Z/leading jet balance at pre-tag stage p12 : Z/leading jet balance after b-tag (just in order to show available stat, and give the sense of needed luminosity for more serious business) p13 : one slide to summary for things to be checked more carefully soon p14 : summary / advertizement for planned extension

Any comments are welcome !

Best regards, Yasu Okumura

[btuan]

@YasuyukiOkumura ,

Looks really nice! I'll take a deeper look, but a few quick comments:

• For the Z-resonance plots on slide 6, do you want to put the binned average on the plot as well? Just for validation.
• Perhaps zoom in on the balance plots on slide 10 -- there don't seem to be any too significant outliers to the right.
• Electron efficiency correction included the reco, trigger, and PID values. (slide 3)
• Include overlap removal in basic event selection procedures

And, just a general question: is it common to make binning finer near resonance peaks? Just curious, since I see variable binning on some other plots, where it makes sense to widen binning in regions with lower stats.

Best, Brian

[YasuyukiOkumura]

Dear Brian & Gabriel,

Thanks, Brian, for useful comments! Suggestions have been implemented. http://hep.uchicago.edu/~okumura/works/pics/20150816/yasuyuki.okumura.20150814.00.pdf

another update is Also I found that the pT binning has been applied as it supposed to be the lowest pT bin, and it has been modified. Now I show the pT bin 20,30,75,200, and even 20-30 GeV, the response looks reasonable. (and I removed the comment for concern for low pT slice)

PS: For Brian's question, in the current ones we apply flat binning. It could be tuned but not really needed for this case. It will be case by case.

Best regards, Yasu Okmura

[btuan]

Notes from jet calibration presentation:

Check leading jet kinematics since we see a discrepancy in cutflow table between data and MC Our cutflow shows discrepancies when we apply our balancing cuts, excess MC events

Slide 11: Have better range for ratio plot, difference around 5% level, zoom in.

Maybe run analysis with a different generator to see Z+jet balance (maybe Sherpa) to evaulate uncertainties Perhaps for b-tagging too, re-evaluate when we have higher statistics

[YasuyukiOkumura]

Thanks for the note.

Let's start the preparation for the next round of our analysis.

• check available 25 ns samples for MC this time, let's process samples for both Powheg & Sherpa (Could Brian please check that?)
• Meanwhile until we get the 25 ns DxAOD, please do the MC based study.
• Also once we have 25 ns data DxAOD, let's put the first priority to have the same set of the plots and immediately give the update talk at the meeting

Let's keep our momenta

Best regards, Yasu