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Data

CIMA is used in CMS Masterclass settings where groups of students analyze real event data from the Compact Muon Solenoid (CMS) detector of the Large Hadron Collider (LHC). CIMA does not contain this data. Rather, the data is associated with a separate event display program called iSpy. iSpy is maintained by Tom McCauley, who selects CMS event data that's appropriate for student analysis and packages it for use with that program.

Explore the iSpy instance used with CIMA.

Using iSpy, students examine CMS events and identify the "final state" particles recorded by the detector (electrons, muons, and photons). From these, they infer the "primary state" particles that produced them (mainly Z and W bosons). Where appropriate, they also identify the invariant mass of the primary state particle. For each event, they record this data in CIMA. Once a group has analyzed many events, CIMA provides them with tables of data and histograms of mass data for both their local group and for all groups participating in that Masterclass. Thus, CIMA must organize and display data in a manner that parallels the way iSpy organizes its data files.

How iSpy organizes its data files

The fundamental unit of iSpy data is one .ig file, which contains data for 100 CMS events. These typically have filenames of the form masterclass2019_{N}.ig where {N} can range from [1,100]. Individual events, selectable through the iSpy interface, are labeled Event_1 ... Event_100.