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Nano/Micro Database Summary

for BaBar Release Versions 8.8 and later

Here you will find links to several pages descibing what is available in the nano(tag) and micro portions of the event store, as well as some sample code that can be used to access this data. Some familiarity with the BaBar analysis framework is assumed, particularly with all the sections of the Workbook for BaBar Offline Users up to and including "Making Minor Modifications to Existing C++ Code (for example, booking a new histogram)."

Nano(Tag) Database

The Nano Database contains event information, such as selection bits, global variables, trigger information.
AWG Pages for Physics Flags The AWG people document their physics tag bits, along with the skims that are made from them.
Event Parameters variables describing an event (e.g., event shape, highest-momentum particles)
Trigger Flags flags indicating which Level 1 and Level 3 trigger lines fired for this event
Background Filter & Digi Filter Flags flags indicating why the background filter passed the event
All tag variables of type
[ bool : float : int : ALL ]
Alphabetical listings of the 400+ tag variables. Here are instructions on how to make a dump of your collection.

Micro Database

The Micro Database is made up of a list of BetaCandidates. Their behaviour from the point of view of kinematics is identical as in the Reco Database.
Kinematic Variables variables accessible for every candidate in both the Reco- and Micro- Databases.
Available Lists & Maps the lists of candidates that are automatically available (e.g., charged tracks, good tracks), and the tables which map candidates with each other (e.g. cluster<-->bump matching, IFR<-->EMC matching
Single Candidate Info variables describing each candidate in an event (e.g., momentum, energy, basic subsystem information)

How-to Links

Several Links are presented here which point to helpful tutorials and sample code related to using the Nano and Micro databases.
Official How-to Page Direct link to the official "BABAR Analysis Examples and How-to's" web page.
How to get Micro (or Tag) plus something else Hypernews article by Bob Jacobsen which describes how to use some of the *.tcl scripts (which are available in BetaUser), and their framework interfaces, to read in specific raw/reco information.
Running on Micro with analysis-5 A tutorial on how to get started with release analysis-5 (8.8.0c-physics-1)


Maintained by Chris Roat croat@stanford.edu