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Lhep https://wiki.lhep.unibe.ch/index.php?title=Nicola&diff=356&oldid=prev 2010-03-12T02:37:51Z

<p></p> <p><b>New page</b></p><div>== Walk-through presentation ==<br /> <br /> Link to Indico talk [http://indico.cern.ch/getFile.py/access?contribId=0&amp;resId=0&amp;materialId=slides&amp;confId=71656]<br /> <br /> <br /> == Comments Michele ==<br /> <br /> ----<br /> &lt;span style=&quot;background:red&quot;&gt;<br /> Prepare a table with the cross sections and expected number of events after selection cuts for 10 pb-1<br /> W + 0,1,2 jets (note _jets_, not partons)<br /> &lt;span style=&quot;background:#00FF00&quot;&gt;<br /> ----<br /> <br /> Same for background, and also Wbb, Wcc. Include k-factors to NLO.<br /> <br /> ----<br /> Prepare plots of signal+background (for example W transverse mass) to<br /> get a feeling on how good the signal could be detected (again<br /> normalized to 10 pb-1).<br /> <br /> ----<br /> Get the numbers/plots above for 7 TeV, or describe how you will be<br /> quickly able to get 7 TeV estimates.<br /> <br /> ----<br /> Get an estimate for 900 GeV too.<br /> <br /> ----<br /> <br /> Define the measurement to be done. Likely W+0/W+1 ? Alpha_s ? <br /> <br /> ----<br /> <br /> Who else in ATLAS will be doing this measurement ?<br /> <br /> ----<br /> <br /> What are the plans and timescales of the W+jets ATLAS group for a<br /> similar measurement ?<br /> <br /> ----<br /> <br /> What can/has to be done with MC until January/February ?<br /> <br /> ----<br /> <br /> You will have to use release 15. Do this asap and report issues.<br /> <br /> ----<br /> <br /> Describe how data quality and luminosity are implemented in the<br /> analysis.<br /> <br /> ----<br /> <br /> How will duplicated events be removed ?<br /> <br /> ----<br /> <br /> Prepare technical howto on how alpha_s can be changed in the MC and<br /> how and when you can get such samples for testing the analysis<br /> <br /> ----<br /> <br /> Prepare a detailed list of samples that you need, as much as possible<br /> add the file names, release, location of the files, etc...<br /> <br /> ----<br /> <br /> Tell us how you are going to get a multi-jet/QCD sample (from data,<br /> who is going to provide it for you ?)<br /> <br /> ----<br /> <br /> Which background samples are you getting from data, which ones<br /> from MC ?<br /> <br /> ----<br /> <br /> Evaluate the CPU hours you will need (order of magnitude) and disk space<br /> <br /> ----<br /> <br /> How is you analysis run ? grid ? All configs in some TopAnalysis.py ?<br /> <br /> ----<br /> <br /> How will you make sure that certified code is used ?<br /> <br /> ----<br /> <br /> What is the location of your analysis code in SVN (preferrably in<br /> ATLAS, Bern also OK)<br /> <br /> ----<br /> <br /> What will be the backup trigger if the single electron 20 GeV is not<br /> usable ? What is the efficiency ?<br /> <br /> ----<br /> <br /> Will all the data you need be in the e-gamma stream ? Do you need<br /> other streams ?<br /> <br /> ----<br /> <br /> How will the trigger efficiency be applied to MC ? As a weight ?<br /> <br /> ----<br /> <br /> Will the trigger efficiency plateau be evaluated as a function<br /> of eta ?<br /> <br /> ----<br /> <br /> Describe possible systematics studies to be done on a comparison<br /> between Alpgen and Herwig MC. Or also Pythia, Sherpa, etc...<br /> <br /> ----<br /> <br /> Make a list of expected systematic uncertainties and describe where<br /> will you will be taking them from. In particular for the ratio<br /> measurement.<br /> <br /> ----<br /> <br /> Prepare a technical howto for changing the jet-energy-scale for<br /> systematics evaluation. Also evaluate to what level the JES has to be<br /> known as a function of jet energy (do not forget the low energies).<br /> <br /> ----<br /> <br /> Describe in detail the jet reconstruction and object definition<br /> criteria you will use including jet quality. Also describe the jet<br /> corrections you will use (muons in jet ? what scale ? overlaps ?<br /> include track-jet information ? reconstruction pt threshold ?<br /> generator pt threshold in MC ? Etc...<br /> What jet branch are you using ?<br /> <br /> ----<br /> <br /> Describe the Met reconstruction and corrections you will use. What is<br /> the expected Met resolution ? Met branch ?<br /> <br /> ----<br /> <br /> e-jet overlap: evaluate on MC, how often the &quot;electron&quot; was actually a<br /> jet/quark/gluon (mistake in overlap removal)</div>

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