Particle identification with the AMS-02 RICH detector search for dark matter with antideute.pdf

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Particle identification with the AMS-02 RICH detector search for dark matter with antideute.pdf

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Particle identification with the AMS-02 RICH detector search for dark matter with antideute

a r X i v : 0 7 1 0 .0 9 9 3 v 1 [ a s t r o - p h ] 4 O c t 2 0 0 7 Particle identification with the AMS-02 RICH detector: search for dark matter with antideuterons Lu??sa Arruda, Fernando Bara?o, Rui Pereira LIP/IST Av. Elias Garcia, 14, 1 o andar 1000-149 Lisboa, Portugal e-mail: pereira@lip.pt Abstract— The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be installed on the International Space Station (ISS) for at least 3 years, is a detector designed to measure charged cosmic ray spectra with energies up to the TeV region and with high energy photon detection capability up to a few hundred GeV, using state-of-the art particle identification techniques. It is equipped with several subsystems, one of which is a proximity focusing Ring Imaging C?erenkov (RICH) detector equipped with a dual radiator (aerogel+NaF), a lateral conical mirror and a detection plane made of 680 photomultipliers and light guides, enabling precise measurements of particle electric charge and velocity (?β/β ～ 10?3 and 10?4 for Z = 1 and Z = 10 ? 20, respectively) at kinetic energies of a few GeV/nucleon. Combining velocity measurements with data on particle rigidity from the AMS-02 Tracker (?R/R ～ 2% for R = 1 ? 10 GV) it is possible to obtain a reliable measurement for particle mass. One of the main topics of the AMS-02 physics program is the search for indirect signatures of dark matter. Experimental data indicate that dark, non-baryonic matter of unknown composition is much more abundant than baryonic matter, accounting for a large fraction of the energy content of the Universe. Apart from antideuterons produced in cosmic- ray propagation, the annihilation of dark matter will produce additional antideuteron fluxes. Detailed Monte Carlo simulations of AMS-02 have been used to evaluate the detector’s performance for mass separation, a key issue for D?/p? separation. Results of these studies are presented. I. THE AMS-02 EXPERIMENT The Alpha Magnetic Spectrometer