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Explained how to find real data in bkk #164

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Explained how to find real data in bkk #164

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13 changes: 13 additions & 0 deletions first-analysis-steps/bookkeeping.md
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Expand Up @@ -98,6 +98,19 @@ straight to:
by typing this path and pressing the `Go` button.
{% endcallout %}

Now, let's get to the real data!

Let's assume the drop-down menu at the bottom of the "Bookkeeping tree" tab is changed to `Event
type`, as in the previous case. The real data is stored in the directory `LHCb` (as opposed to `MC` for the simulation). Navigating inside this directory, you may find the folders corresponding to the various datasets, for example, calibration data taken in different years, or the actual collision data.
If you are interested in analysing the dataset of proton-proton collisions for a given year (say 2016), you should find a directory called `Collision16`.
This is different for collisions involving other particles than protons, each of them has its own directory (e.g. `Protonhelium18` or `Lead15`).

We will focus on the proton-proton collisions here. Inside the `Colision16` folder, you will find a set of event types.
The ones which are the most important are `90000000` corresponding to the data processed by the Stripping framework, and `94000000` corresponding to the Turbo data. If you would like to use the Stripping dataset, select the necessary data taking conditions (e.g. `Beam6500GeV-VeloClosed-MagDown`), navigate to the `Real Data` and select the version of the Reconstruction (e.g. `Reco16`). You will see a list of available Stripping versions for a given dataset.
Inside each of the folders, you find a list of `DST` and `MDST` files corresponding to different streams, and sub-folders containing so-called Working Group Productions, which are the reduced versions of relevant streams with certain preselection applied.
Similar strategy holds for the Turbo dataset, but instead of selecting the Reconstruction and Stripping versions, one has to choose the version of the Turbo.


{% challenge "Find your own decay!" %}
Think of a decay and try to find a Monte Carlo sample for it. You could use
the decay that your analysis is about, or if you don't have any ideas you
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