Acceptance Calculation for the DLS ( Dilepton Spectrometer )

Student Name: Wei Yuan Yang
Mentor: Howard Matis
Group: DLS
Division: Nuclear Science


The nucleus+nucleus collisions provide us a way of creating hot, dense nuclei we are interested in at the time the collisions take place. Detections of the particles generated by the interactions serve as an indirect probe of the actual conditons in these kind of nuclei. Because Dileptons ( electron and positron pairs ) are insensitive to hadronic enviroments ( does not have strong interactions ), their characteristic would remain largely the same from the time of creation of the dileptons and the time the detectors receives them. Their undistored characteristics then would provide us the relatively true information about the nuclei we are interested in.

The detection of Dileptons would expect to give us the cross section of these pairs in the collision, and the cross section itself can be used as a good check or good reference to build different nuclear models on. One of the problems is that the detectors are not expected to receive all of the particles created, the counts of the detectors wouldn't serve as the cross section of the dilepton production by the collision. To connect the counts to the physics, therefore, we need a so called "Acceptance Table" to correct the counts for obtaining what we concerns us most--the cross section.

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Wei Yuan Yang
National Taiwan University
Physics Department