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Welcome to the May ANL ASC Analysis Workshop Wiki

Introduction

There will be an Analysis Workshop at ANL ASC from 14 May through 16 May.

This will be a true workshop with very few talks and most of the time devoted to working, learning and collaborating.

The aim is to try to do as much of a true analysis as possible with the reprocessed FDR-1 data (FDR-2 data will not be available until June). This follows somewhat from the BNL/ANL Jamboree that took place in March--but the participation in that meeting is not a pre-requisite. General information about FDR can be found HERE.

Detailed guidance will be provided for at least two types of analyses: Jet cross-sections, and prompt photons. The participants are, of course, free to work on whatever type of analysis they are interested in.

The workshop will be designed to help ATLAS physicists at all levels of familiarity with the ATLAS software. You will get the most out of attending all three days--but this is also not necessary in order to profit from this workshop.

Agenda

Agenda is here.

Agenda for FDR-1 Users meeting (where you can find the luminosity discussion) is here.

Registration

The registration is closed.

Structure of the workshop

The workshop is designed, as with our previous two workshop/jamborees, for the participants to gain as much practical experience with ATLAS analysis as currently possible. To this end, we will use the Full Dress Rehearsal-1 (FDR-1) data, which is the closest approximation of the real data we currently possess. We hope to use the reprocessed version which is currently expected to be available beginning the week of the 5th of May.

As of Monday 12th of May, the reprocessed FDR-1 data is not yet distributed. It's likely that this data will appear either shortly before or during the workshop. This means that we will start with the old FDR-1 data. We will still try to incorporate the reprocessed data into the workshop as it becomes available.

We will set up the workshop to work off of Athena version 13.0.40 although the use of 14.0.0, with some limitations, will be possible.

Individual technical steps below are goals the participant can set for themselves during the workshop. The general progression of the technical steps are designed to guide the participant towards a real analysis. The steps are divided into those appropriate for different levels of familiarity with ATLAS software. The participant is free to start at any point.

There will be analyses "packages" available to be used in doing many of the steps below. These are planned to be:

• Z->ee
• prompt photon
• high pt jets

The participants may, of course, use their own analysis.

For your reference, a description of the ATLAS analysis model is Here.

Beginner

1. Set up your ANL ASC account. The instructions are here.
2. Set up and run athena "hello world". General instructions are HERE.
3. Set up and run athena "Analysis Skeleton" on an AOD file and produce a root n-tuple. A general instruction from the ATLAS Twiki Here can be followed. An example MC AOD data file that can be used is (works for 13.0.40 as well as 14.0.0):
   • /users/ryoshida/testarea/data/trig1_misal1_csc11_V1.005144.PythiaZee.recon.AOD.v13003002/AOD.016450._00001.pool.root.1
4. Modify the default analysis and produce your own plots or n-tuple variable. See sidebar at left for a working example
5. Run the same job on the Grid using pathena.
   • >source ../cmt/setup.sh
   • >cd ../run
   • If you are using /share/grid/app/asc_app/asc_rel/1.0/setup-script/set_atlas.sh to use the share versions of pathena, do the following.
   • cp ~chakanau/public/testarea_jets/13.0.40/analysis/HighETjets/run/ConfigExtractor.py .
   • cp ~chakanau/public/testarea_jets/13.0.40/analysis/HighETjets/run/FakeAppMgr.py .
   • We'll try to fix the above kluge in the future.
   • >pathena --inDS data_you_want_to_analyze.AOD.v13xxxxx --outDS your_output_ntuple_name AnalysisSkeleton_topOptions.py

Intermediate

From here on, there are detailed examples for a High-Et Jet analysis and a Prompt Photon analysis. There are links below for the simple Z->ee program used in the beginners section.

Data:

1. Run your analysis job on FDR-1 data locally to produce an analysis n-tuple. Here is a working example
2. Select events using TAGS (trigger and non-trigger) in your analysis locally. Here is a working example
3. Find the luminosity for the sample you have analyzed locally
4. Plot distributions (mass, pt, eta..)
5. Run your whole analysis on the Grid

MC:

1. Run your analysis job on appropriate MC and compare distributions with "data"
2. Run your analysis job on appropriate MC to determine acceptance (trigger and selection separately if appropriate)

Result:

1. Determine the data cross-section by using the acceptance from MC and luminosity from data.

Advanced

Alternative Analysis Models:

1. Produce reduced data sets (DPDs) from FDR-1 data. See the instructions here.
2. Run over DPDs with Athena to produce results
3. Use Athena Root Access (ARA) to analyze DPDs

Analyses:

1. Determine the background using appropriate MC.
2. Add information in output n-tuple for data study. (e.g. energy scale, systematic uncertainties)

Accessing reprocessed FDR1 data at CERN

All reprocessed FDR1 is DQ2 accessible at CERN

 *> dq2_get _dataset_name_   

works at CERN

There is a copy of the Muon stream already in a temporary directory:

 *> ssh lxplus223 
 *> cd /tmp/braden/

Accessing reprocessed FDR1 data at ANALY_MWT2 and locally

To see the data set do

 *> dq2_ls -f -s UCHIALL user.MarcoMambelli.fdr08_run1.all.Egamma.AOD.r24.copy080515

Local copies are being made and will appear in

 *> /data/nas2/users/marco/

If you want to copy the data set from the grid do

 *> dq2_ls -r user.MarcoMambelli.fdr08_run1.all.Egamma.AOD.r24.copy080515

You can run on them using pathena with the command

 *> pathena --inDS user.MarcoMambelli.fdr08_run1.all.Egamma.AOD.r24.copy080515 --outDS --nFilesPerJob 2 --site ANALY_MWT2

Luminosity for the reprocessed data

Richard Hawking's presentation at the FDR user's meeting 15 may is here