Physics – Instrumentation and Detectors
Scientific paper
2010-08-24
Nucl.Instrum.Meth.A639:246-248,2011
Physics
Instrumentation and Detectors
Submitted to special edition of NIMA, Proceedings of RICh2010. v2 as accepted for publication
Scientific paper
10.1016/j.nima.2010.09.175
The Selex experiment measured several billion charged hadron tracks with a high precision magnetic momentum spectrometer and high precision RICH velocity spectrometer. We have analyzed these data to simultaneously measure the masses of all the long lived charged hadrons and anti-hadrons from the pi to the Omega using the same detector and technique. The statistical precision achievable with this data sample is more than adequate for 0.1% mass measurements We have used these measurements to develop and understand the systematic effects of a RICH as a precision velocity spectrometer with the goal of measuring 10 masses with precision ranging from 100 KeV for the lightest to 1000 KeV for the heaviest. This requires controlling the radius measurement of RICH rings to the ~10^{-4} level. Progress in the mass measurements and the required RICH analysis techniques developed are discussed.
Cooper Peter S.
Engelfried Jurgen
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