# Presentation: 049599

## Common Samples Group

- Y. Gershtein

## Goals

-   The idea for this group comes from a grass-root movement for common data skims -   we will try to maintain the spirit
-    The group’s charge is to find ways to reduce duplication of effort in physics groups
-    We hope that this group will become a place where people from different physics groups can work together and share work on similar tasks

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Tasks

-  selective p13 DST reprocessing with p14
-  fixing calorimeter and vertex in TMBs
-  skimming p14 TMB (and moving from skimming to off-line inclusive streaming)
-  common object certification and correction
-  documenting and coordination production of a common use data sets – both MC and data

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Slide 4

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Selective DST reprocessing

-  Use remote farms to re-reconstruct p13 data from DST – but if we want to finish some time next winter we can only process ~1/3 of the data
-  Define the selection based on
-  benefit from reprocessing
-  physics priority
-  fraction of data selected
-  New code -> p14.05.00
-  Events are selected based on p13 objects
-  calorimeter problems and old vertex
-  Complementary to p13 thumbnail fixing

- O. Atramentov, F. Deliot, YG, H. Greenlee, G. Landsberg, M. Verzocchi

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Selection for Reprocessing

| Stream | Definition | Fraction |
| --- | --- | --- |
| Single EM | |id|=10,11   pT>18 GeV | 14.7% |
| Single MU | “p14 loose” max(local, global)>10 GeV | 5.0% |
| EM+MU | EM: |id|=10,11   pT>5 GeV                           MU: “p14 loose” | 3.8% |
| diEM | |id|=10,11 pT>7 GeV | 2.1% |
| diMU | “p14 loose” | 3.7% |
| MHT | MHT30_3CJT5  | 0.8% |
| 3 jets | pT>20, 15, 15 
4JT10, 3JT15(_PV), 3JT15_L2L0(_PV) | 6.7% |
| QCD | JT_125TT, JT_95TT, JT_65TT | 0.9% |
| JES | EM: |id|=10,11   pT>4 GeV 
CEM5, EM_LO(_SH)(_EMFR8), EM_HI_SH12, EM_HI_L2_SH  | 0.9% |

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Fixing Thumbnails

-  Fix calorimeter problems, redo vertexing with latest algorithms and re-reconstruct calorimeter objects
-  p13:
-  Energy sharing + tower 2 problems
-  correct (p14) ICD weights
-  cable swap
-  Two pass vertexing and min-bias PV selection
-  p14:
-  Tower 2 problems
-  cable swap
-  Two pass vertexing and min-bias PV selection

- S. Protopopesku, M. Verzocchi

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Fixing Thumbnails

-  Fixer is ready to go
-  lost a week chasing a nasty non-reproducible crash (which was causing p14.04 d0reco crashes, too)
-  Will start fixing p14 TMB’s first
-  status will be posted on the CS web page
-  expect to finish p14 by the end of October
- You can run the fixer by yourself
-  instructions can be found on the CS web page

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Skimming and Streaming

-  Thumbnails will be skimmed
-  inclusive skims
-  (practically) no limit on number or size of skims
-  Off-line exclusive streaming
-  anticipate the need for future data reprocessing
-  does not affect thumbnail skims
-  will separate DST’s into four exclusive streams
-  Stream A – high pT electrons/muons  ~ 30%
-  Stream B – high pT jets, MET, taus     ~ 20%
-  Stream C – low pT muons                  ~ 20%
-  Stream D – the rest                           ~ 30%
-  separation is based on skim definitions (being finalized)
-  considering writing out RAW data for Stream A

- O. Atramentov, F. Deliot, YG, H. Greenlee, M. Verzocchi

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Stream A

-  1EM   ID=10,11 pT>18, h8<75        10%
-  2EM   ID=10,11  pT>7                      2%
-  1MU  “loose”, max(local, global)>10  8%
-  2MU  “loose”                                    5%
-  MU+EM   “loose”, ID=10,11, pT>5 GeV
-                    one track pT>5 GeV           6%
-  JES  (tight version)                            1%
-  Minbais                                            1%
-  Zero bias                                          1%
-  J/psi electrons                                   2%

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Stream B

- JT_65TT, JT_95TT, JT_125TT                       2%
- MHT30_CJT5 + 3CJT5 monitor                      3%
- 3jets pT>20,15,15, |eta_d|<2.6                   12%
- MET+trk   MET>20, pT>5                             8%
- Tau+2trk  10 GeV, 1-prong, NN>0.3
-            plus two tracks above 5 GeV                     11%
- EM + trk    ID=10,11 Et>12,
-            track pT> 7 GeV matched to EM
- EM + 2trk  ID=10,11 Et>8, 2 trk pT>5
-            one matched to the EM                             6%
- MU + 2trk  “loose”, central pT>5,
-            plus additional track above 5 GeV               9%
- JES  (all)                                                       9%

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Stream C

-  b-MU “medium”, central pT>2      33%

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Common Corrections 

- The idea is to move certified object corrections to a common package
- Make sure that different root-tuple makers (top_analyze, TMB_analyze, wz_analyze, etc...) use the same corrections – *can have a well-defined versioning system*
- Decouple the correction code from tuple-making code – easier path from correction code into reco and better code development practices
- Gain ability to write out corrected objects in a common format (thumbnail for now)
- Object corrections on a root-tuple level:
- Important for development – but the code should be made available in the framework on a _regular basis_

- A. Zatserklyaniy, F. Deliot, YG

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Common Corrections

- For each object, a new chunk with corrected objects is added to the event
- Physics objects are modified so that the new object can be represented by it
-  for example: electron likelihood; error on jet scale correction...
- The root-tuple makers become much simpler – they just need to take a chunk and put it into a root branch
- Thumbnails for the physics objects are modified so that the new fields get packed and the event can be written out – this can become a platform for common sample definitions

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Plan for Common Corrections

-  Ideally:
- d0correct contains only RCP’s
- corrections are done by dedicated packages (like em and muons now)
- the versioning is ensured by a high level releases
- affect only high level packages like emreco/em_evt
- can be done quite frequently
-  Near Future (next week)
-  some of corrections are done by dedicated packages
-  some will have to be applied in d0corr code
-  versioning by tar-balls and clear CVS tags            (*i.e.* d0cor-01-02 for all relevant packages)

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Common MC Samples

-  Need to have an inventory of existing MC and the requests from all physics groups
-  Some of the samples can be shared (with proper parameter coordination)
-  Drell-Yan
-  QCD
-  W+jets
-  Looking for a person to organize this effort

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Common Data Samples

- Work on data sample is an integral step of every analysis. With very little effort your sample and analysis code can become useful for other people
-  good example is Marian’s di-muon sample for LP
-  enjoy increased name recognition 
- CS group can become a repository of knowledge about useful data samples and code
-  easier start for newcomers
-  environment which encourages people working on similar analyses in different physics groups to share the workload
-  Leslie Groer and Ryan Hooper volunteered to coordinate creation of high pT di-EM and di-MU samples – what about other final states?

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003

## Summary/Plans

-  A lot of projects have started
-  So far concentrated on getting fixed and skimmed data to collaboration
-  The activity on common MC and data samples is ramping up
-  Stay tuned!

- Collaboration Meeting                         Yuri Gershtein

- 10/10/2003