LHCb | Computing | Book-keeping	Book-keeping Database model

Glossary

• Beam angle

Angle of the beam used.

The beam angle is an attribute of " runset ".

• Beam energy

Value of the beam energy used.

The beam energy is an attribute of " runset ".

• Dataset

Data of the same type and format, created in a single job and stored in a single file. The data in the dataset consists of events. Events are grouped in a run. One dataset contains several runs. A dataset resides on tape. A dataset should be roughly 1 Gbyte and contain 1000 events.

• Datatype

For the moment, runset will contain the following types of data ( GEN, MC and DST ):

• GEN: event after generation
• MC: event after simulation
• DST: event after digitisation and reconstruction

The datatype is an attribute of " runset" .

• Decay generator code

A number that identifies the decay generator that was used to produce a dataset. In sicb, at present this is 4001.

The decay generator code is an attribute of " physics and generator data ".

• Decay generator name

Name that identifies the decay generator that was used to produce a dataset. For example, Pythia 6.125, qq, or a home-made generator.

The decay generator name is an attribute of " physics and generator data ".

• Description of the generation

Description of a primary interaction and decay generators. For example, Pythia 6.125 for production with pT cut = 3.47 GeV and decay with qq. Today, the embedded Pythia parameters are stored in pythia.cdf.

The description of the generation is an attribute of " physics and generator data ".

• Event Description

The event description is an attribute of "runset".

• Event Type

The event type is an attribute of "runset".

• File sequence number

The file sequence number occupied by a dataset on a tape.

The file sequence number is an attribute of " runset" .

• Filesize

Size of the file on tape in MegaBytes. For example, 1100.

The filesize is an attribute of " runset ".

• First Event

First event of a runset

The first event is an attribute of "runset".

• Generator parameter name

Name of a parameter used by a generator. For example, a pT cut. Today, the embedded Pythia parameters are stored in pythia.cdf.

The generator parameter name is an attribute of " generator parameters ".

• Generator parameter value

Value of a given generator parameter. Example for pT cut = 3.47 GeV.

The generator parameter value is an attribute of " generator parameters ".

• Kinematic parameters

Cuts can be imposed on the momentum of a particle of interest (pmin, pmax).

Geometrical and kinematic parameters are stored in a table called " kinematics ".

• Kinematic parameter name

Name of a kinematic parameter. For example, Phimax.

The kinematic parameter name is an attribute of " kinematics ".

• Kinematic parameter value

Value for a kinematic parameter. For example, 0.

The kinematic parameter value is an attribute of " kinematics ".

• Laboratory

A number indicating the name of the laboratory and the platform where the production was done, or where the real data was created.

Possible values are:

Table 1

ID	Centre	Platform	OS	Comment
1	CERNSP,RSBATCH	IBM	AIX
2	CERN/CSF	IBM	AIX	not likely to be used any more
3	Lausanne/Alpha	Digital		not likely to be used any more
4	Heidelberg/Alpha	Digital		not likely to be used any more
5	RAL/CSF
6	Lyon
7	CERN/CS2			not likely to be used any more
8	CERN/PCSF	Intel	NT
9	CERN/LHCb LSF cluster	Intel	NT	PC corridor cluster

• Last Event

This is the last event of a runset

The last event is an attribute of "runset".

• Luminosity

Luminosity of the beam used.

The luminosity is an attribute of " runset ".

• Number of events

Number of events in the runset. The number of events should normally be 1000 per run.

The number of events is an attribute of " runset ".

• Physics channel

The physics channel defines the final state of a pp interaction. For example, minimum bias (all possible events), bb inclusive (all possible events, with a B; for example in sicb this is indicated by the event type 350000),

, etc.

The physics channel is an attribute of " physics and generator data ".

1. Primary interaction generator code

A number that identifies the primary interaction generator that was used to produce a dataset. In sicb, at present this is 4001.

The primary interaction generator code is an attribute of " physics and generator data ".

2. Primary interaction generator name

Name of the primary interaction generator. For example, Pythia.

The primary interaction generator name is an attribute of " physics and generator data ".

3. Production year

Year and version of the detector geometry. For example, 99-07-1.

The production year is an attribute of " physics and generator data ".

4. Program version

Version number of the program. For example, 200.

The program version is an attribute of " runset ".

5. Reconstruction version

Version number of the reconstruction program. For example, 1.2.

The reconstruction version is an attribute of " runset ".

6. Run

A run is a collection of events.

7. Run Description

For a run, we will describe how this run have been generated.

The run description is an attribute of "runset".

8. Run number

Number of the run. A run number is unique. For example, 1002.

The run number is an attribute of " runset ".

9. Run Type

The run type is an attribute of " runset ".

10. Seed name

Name of the random number seed. For example, seed1, seed2 etc.

The seed name is an attribute of " runset ".

11. Seed value

Value of the random number seed. For example, 123456789.

The seed value is an attribute of " runset ".

12. Simulation version

Version number of the simulation program. For example, 4.

The simulation version is an attribute of " runset ".

13. Tape location

Place where the tape can be found.

Tape location is an attribute of " runset ".

14. Tape support

Support of the tape (redwood, CD-Rom, DLT,..).

15. Vertex smearing

The type of vertex smearing used.

The vertex smearing is an attribute of " runset ".

16. Volume serial number

A unique number written onto the label of a magnetic tape. This number is used to call the tape up from the vault by the SHIFT system. For example, y21345.

The volume serial number is an attribute of " runset ".