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.dddddddddd.su2020.rrrrrr_ssssssss.art

• Let's use MC run number 1000 only for all datasets
• lets fix the 4-th 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, 3-rd, field as a 10 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

 DDDDVsSObB  (lowercased characters stay as is, uppercase - interpreted)

 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

 V   : dataset version, i.e. 0,1,2 ...  (in principle, could be anything and be used for any purpose)
 S   : stage index: some datasets require a multi-stage generation, to make a clean and visible cut, can assign S=a to reconstruction
 O   : for stages with several output streams, just number them - 0,1,2,3,4...
 B   : beam intensity : 0 - signal only, 1 : 1 batch mode, 2 : 2 batch mode , the rest -reserved for future 
  
 examples:

|------------------------+---------------------------------------------------|
| 4 char dataset ID stub | comments, examples                                |
|------------------------+---------------------------------------------------|
| beam                   | beam, trace everything                            |
| bmum                   | bmum : beam, trace mu-, but not e+,e-, gamma      |
|                        | bmum1s10b0 : s1, 0=first output stream - into TS  |
|                        | bmum1s20b0 :                                      |
|                        | bmum1s30b0 :                                      |
| bpim                   | beam pi- tracing                                  |
| mdio                   | DIO electrons,                                    |
|                        | examples: mdio0s10b0: leading order               |
|                        |           mdio1s10b1: leading log,+ 1 batch       |
| mumi                   | mu-, example : mgun0sr1b0 : muon particle gun     |
| mupl                   | mu+                                               |
| elec                   | e- (i.e. single particle gun)                     |
| posi                   | e+                                                |
| pipl                   | pi+                                               |
| pimi                   | pi-                                               |
| pbar                   | pbars example: pbar0s01b0 (reconstructed)         |
| rpce                   | RPC external                                      |
| rpci                   | RPC internal                                      |
| rmce                   | RMC external                                      |
| rmci                   | RMC internal                                      |
| cosm                   | cosmics                                           |
| prot                   | ejected protons                                   |
| deut                   | ejected deutrons                                  |
| phot                   | ejected photons                                   |
|------------------------+---------------------------------------------------|

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