| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1829199 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2008 | 4 Pages |
The use of a sequence of aerogel radiators with different refractive indices in a proximity focusing Cherenkov ring imaging detector has been shown to improve the resolution of the Cherenkov angle. In order to obtain further information on the capabilities of such a detector, a maximum-likelihood analysis has been performed on simulated data, with the simulation being appropriate for the upgraded Belle detector. The results show that by using a sequence of two aerogel layers with different refractive indices, the K/πK/π separation efficiency is improved in the kinematic region above 3 GeV/c . In the low momentum region, the focusing configuration (with n1n1 and n2n2 chosen such that the Cherenkov rings from different aerogel layers at 4 GeV/c overlap) shows a better performance than the defocusing one (where the two Cherenkov rings are well separated).
