Studies in data involving photons, for CIT undergrads

• Yousi Ma

• Susan Dittmer

• Ben Faber

• Elliot Schneider

How to make event displays:

first filter a RECO file to have only those events you have selected.

e.g. use your analyzer, to pring run:lumi:event triples for the high mass events

Use the Edmtool for this:

https://twiki.cern.ch/twiki/bin/view/CMS/WorkBookPickEvents

if you don't have a cern account:

edmPickEvents.py is part of the PhysicsTools/Utilities package with tag V08-01-01 and works for CMSSW 382 or higher.

How to Run edmPickEvents.py

The script edmPickEvents.py can be run interactively or via a CRAB job. If you run interactively, before you run it, make sure you have the dataset that you want to pick events from, available locally. If you have few events to pick, run it interactively. In case you do not have the dataset available locally or you have a lot of events to pick, submit a CRAB job.

Run edmPickEvents.py Interactively

To run the script interactively do the following, for example

edmPickEvents.py "/EG/Run2010A-PromptReco-v4/RECO" 140160:98:82878561 140160,101,85437704

these instructions are for cern machines, reformat the output so that the files starte with file:/mnt/tier2/store instead of /store

running this command returns a RECO root file, and then all you have to do is:

cmsShow (your root file)

To setup a CMSSW release look HERE and then checkout the tag as follows:

cvs co -r V08-01-01 PhysicsTools/Utilities

Please remember to do scram b and rehash after checking out the package.

This week's data

6807nb are finished and available in /raid1/yma/MPAfiles

Last week's data:

all 4150nb-1 is finished. It had to be run without the bit 40 or 41 that most data up till now has been processed with. please check your selection yields/pb-1 and check these triggers.

/raid1/yma/MPAfiles/MPA_Run2010B_oct22_4140nb.root <- please analyze me

4150nb-1 coming in Run2010B:

now that the files are getting large and precious, they will be placed in hadoop (redundant backup).

/mnt/hadoop/store/user/yma/MPAdata

/mnt/hadoop/store/user/yma/MPAMC

Current open studies/issues

• Z yields in EE/EE and EB/EE pairs
• Z mass shift due to Endcap transparency change
• high mass diphoton pairs (add R9 cut)
• high mass gammaJet pairs (event displays)
• effect of preselection (no TT bits, adding a sample with a beam scraping filter)
• diphoton rate in data, week to week

previous data:

up to oct15th JSON

7875nb-1 in Run2010B.

3068(3049)nb-1 in Run2010A(old partial) file.

previous results

all of Run2010A is available in septReRECO:

/raid1/yma/MPAfiles/MPA_Run2010A_reRECO_3068nb.root

please add your 2.85pb-1 plots here.

Datasets

all paths relative to /raid1/yma/MPAfiles

Monte Carlo

locations relative to /raid1/yma/MPAfiles/HiggsMCSpring2010

samples from QCD group/older processing:

/raid1/yma/MPAfiles/MCData

code/CVS

cms.hep.caltech.edu/viewvc - to browse

http://ultralight.caltech.edu/gaewiki/CVS for instructions - ben has used it successfully on friday.

I've made an area under apps repository, /apps/MPAcode for us to share. please post your preselection and selection codes here.