Datasets-SU2020-Naming-Conventions

(work in progress)

Mu2e files are required to have 6 field-long names, see https://mu2ewiki.fnal.gov/wiki/FileNames for more details, example:

 cnf.mu2e.su2020.dddddddd.rrrrrr_ssssssss.art

• Let's use MC run number 1000 only for all datasets
• lets fix the third field to su2020 (lowcased) - that would allow to find handily for all su2020 datasets in SAM catalog
• 1+2 fix 5 fields out of 6.
• It makes sense to treat the remaining field as a 8 char long dataset ID. Having fixed length dataset ID is handy

in many respects - we will need to propagate it through the whole analysis chain, from the MC files through the output

of reconstruction to ntuples and histogram files.

• in addition to the dataset ID, a dataset has to have a long descriptive name, but it is the dsid which is supposed

to be used for all practical purposes in the software. Ok, so

 dddddddd = DDDDVVBS

 DDDD: 4-character-long name stub (it looks that 4 chars would allow us to name meaningfully  all datasets we have so far dealt with

 VV  : dataset version, i.e. 01  (in principle, could be anything), for MC files,
       there are different beam tracing - mu-, pi-...
  
 B   : beam intensity : 0 - signal only, 1 : 1 batch mode, 2 : 2 batch mode , the rest -reserved for future
 
 S   : stage index: some datasets require a multi-stage generation, to make a clean and visible cut, can assign S=a to reconstruction

 examples:

|------------------------+---------------------------------------------------|
| 4 char dataset ID stub | comments, examples                                |
|------------------------+---------------------------------------------------|
| beam                   | beam (different ones                              |
|                        | beam01s1                                          |
|                        | beam01s2                                          |
|                        | beam01s3                                          |
| mdio                   | DIO electrons,                                    |
|                        | examples: dioe01s5: leading order                 |
|                        | dioe02s5: leading log                             |
| mumi                   | mu-, example : mumi01s5 single particle gun muons |
| mupl                   | mu+                                               |
| elec                   | e- (i.e. single particle gun)                     |
| posi                   | e+                                                |
| pipl                   | pi+                                               |
| pimi                   | pi-                                               |
| pbar                   | pbars example: pbar0110 (reconstructed)           |
| rpce                   | RPC external                                      |
| rpci                   | RPC internal                                      |
| rmce                   | RMC external                                      |
| rmci                   | RMC internal                                      |
| cosm                   | cosmics                                           |
| prot                   | ejected protons                                   |
| deut                   | ejected deutrons                                  |
| phot                   | ejected photons                                   |
|------------------------+---------------------------------------------------|