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September 2012

September 2012. Contin A., Laurenti G., Quadrani L., Bindi V., Palmonari F. Il Sistema TOF dell’esperimento AMS-02 sulla Stazione Spaziale Internazionale : prestazioni nello spazio e ricerca di materia oscura. Nicolo’ Masi Bologna University and INFN. Matter.

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September 2012

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  1. September 2012 Contin A., Laurenti G., Quadrani L., Bindi V., Palmonari F. Il Sistema TOF dell’esperimento AMS-02 sullaStazioneSpazialeInternazionale: prestazioninellospazio e ricerca di materiaoscura Nicolo’ Masi Bologna University and INFN

  2. Matter Anti-Matter Main tasks An Improved Version of AMS-01 Astrophysics, Dark Matter Antimatter Strangelets • The TOF system provides: • - the fast trigger to the whole AMS and the selector of the events through the LT, HT and SH; • the measurement of the time of flight (Δt), for the determination of the particle velocity (β), with a resolution of few %; • the measurement of the absolute particle charge up to Z =15; • the distinction from upward and downward going particles at a level of 10-9 necessary to distinguish between matter and antimatter;.

  3. Up in the Sky

  4. The AMS-02 TOF On the ISS • TOF consists of 4 plastic scintillator planes, 2 above and 2 below the magnet. • The counters of adjacent planes are orthogonal. • The number of counters per plane has been reduced to 8, 8, 10, 8 counters to reduce the weight (34 scintillators). • Each TOF counter is composed by: • a plastic scintillator1 cm thick and around 120 cm long (Eljen-Technology type: Ej-200), • read at both ends by 2 independently powered photomultiplier tubes (fine-mesh Hamamatsu R5946 with max spectral response at 420 nm), • connected with transparent light guides. Plateau for the trigger efficiency of one counter Hamamatsu fine-mesh R5946

  5. Uptodate performances in space: Beta, time, position and charge Carbon Beta Resolution: 1.2% ->  48 ps Longitudinal TOF-Tracker coordinate alignment

  6. Great charge measurements with • dynodic PM signal, especially for Z>4 • Not only technical, but also • “physical” targets: the measurement • of particles’ beta as a function of charge • The resolution increases with Z, • reaching, after Z = 2, the expected plateau • of 1 ÷ 2 %, corresponding to a resolution • in time better than 60 ps

  7. Dark Matter Program(TOF Group) And physics begins

  8. PAMELA Anomaly: ….and AMS?? No Dark Matter Signal! Clear Signal!

  9. Primary CR Positron from Dark Matter

  10. Light LZPprovidesmeasurablefluxes for AMS-02 SUSY Wino, Little Higgs, KK Theory, PBH, Singlet Scalar, Minimal DM… With e+ and low energy antideuteron we can probe

  11. And alsoHigh Energy Hadrons Total Flux High Energy Antiproton High Energy Signal from KK particle

  12. Neutralino Discrimination parameter I𝜙 for signal and background: the AMSB Wino MSSM is the most suitable for AMS-02, both in antiproton and positrons channel Expectedclearpositronsignal from heavyWino

  13. e+ Little HiggsTheory 95% C. L. contour within WMAP constraint for Little Higgs Dark Matter parameters space Wide range of the parameter space, including the region BF = 1 The region above the line can be distinguished from the background.

  14. Scalar Singlet Goudelis - Antimatter signals of singlet scalar dark matter Parametersspaceexplorable by AMS-02 in the antiprotonchannel

  15. Indirectsearches status Always promisingpositronsearch

  16. Facenda… Kinetic Energy (GeV)

  17. Conclusions • The hadronic Low Energy region is realistically obsolete and has been replaced with a High Energy research. In function of AMS-02 performances, an hadronic research related to very heavy DM particle is ongoing, to restart from PAMELA data. This would be the most significant signal of new particle physics, even cleaner and clearer than the leptonic one. • The positron signal, on the other hand, is of course the fundamental channel for DM study. In terms of intensity of annihilation products fluxes, AMS-02 can see a positron peak for all DM candidates capable of producing e+ beyond 100 GeV.

  18. The recipe:opportunitiesin hadronicchannels Dark Matter Parameters Space for a non-leptophilic candidate: Antiproton & Antideuteron Search : Just a littlepatience!

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