AMS DAYS AT CERN - The Future of Cosmic Ray Physics and Latest Results

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500-1-001 - Main Auditorium (CERN)

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Akira Yamamoto (KEK) , Fernando Ferroni (INFN Italy) , Frank Linde (NIKHEF) , Gianotti Fabiola , Herwig Schopper (CERN) , Rolf Heuer (CERN) , Trümper Joachim (Max Planck Institut) , Yifang Wang (IHEP Beijing)
Description

The Alpha Magnetic Spectrometer (AMS) Experiment on the International Space Station has to date recorded over 60 billion cosmic ray events (e-, e+, p, antiproton, He, Li, B/C ...) up to TeV energies. AMS is a precision particle physics detector built with multiple redundancies and adapted to withstand the hostile environment of space over its long duration mission. The AMS Detector was assembled at CERN and extensively calibrated at the CERN accelerator before launch from the Kennedy Space Center to the ISS in May 2011.

During the first four years of AMS on the ISS, the AMS Collaboration has been engaged in an intensive effort to analyze the increasing volume of charged cosmic rays collected with an accuracy of ~1%. First AMS results on electrons and positrons have been published in Physical Review Letters and further precise results will soon be presented on anti-proton to proton ratio; proton, helium, and other nuclei fluxes; electron, positron, electron and positron and positron fraction at higher energies.

The objective of the three-day “AMS Days at CERN” is to exchange ideas and experiences with the world’s leading theoretical and experimental physicists.  This exchange will lead to a better understanding of the implications of AMS results (published and to be published) and their relevance to some of the key experiments as well as the future course of cosmic ray physics.

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    • 08:30 09:00
      Welcome 30m 500-1-001 - Main Auditorium

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      Speaker: Prof. Rolf Heuer (CERN)
      Video in CDS
    • 09:00 10:00
      Introduction to the AMS Experiment 1h 500-1-001 - Main Auditorium

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      Following the pioneering experiments (ATIC, BESS, CREAM, HEAT, PAMELA, …), using a magnetic spectrometer (AMS) on ISS is a unique way to provide precision long term measurements of primordial high energy charged cosmic rays. AMS was installed on the Station in May 2011. Up to now, 60 billion events have been collected. 40 billion events have been partially analysed. AMS is scheduled to be on the Station until at least 2024. By then AMS will have collected close to 200 billion events. The detector properties and the analysis methods will be introduced.
      Speaker: Prof. Samuel Ting (Massachusetts Inst. of Technology (US))
      Slides
      Video in CDS
    • 10:00 11:00
      Latest AMS Results: The Positron Fraction and the p-bar/p Ratio 1h 500-1-001 - Main Auditorium

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      A precision measurement by AMS of the positron fraction in primary cosmic rays is presented. The results show that at 275±32 GeV the positron fraction no longer increases with energy. The current status of the anti-proton analysis is also presented.
      Speaker: Dr. Andrei KOUNINE (MIT)
      Slides
      Video in CDS
    • 11:00 11:15
      Break 15m 500-1-001 - Main Auditorium

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    • 11:15 11:45
      The e− Spectrum and e+ Spectrum from AMS 30m 500-1-001 - Main Auditorium

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      Precision measurements by AMS on the ISS of the primary cosmic-ray electron flux in the range 0.5 to 700 GeV and the positron flux in the range 0.5 to 500 GeV are presented. The electron flux and the positron flux each require a description beyond a single power-law spectrum. Both the electron flux and the positron flux change their behavior at ∼30 GeV but the fluxes are significantly different in their magnitude and energy dependence. Between 20 and 200 GeV the positron spectral index is significantly harder than the electron spectral index.
      Speaker: Prof. Stefan SCHAEL (RWTH-Aachen)
      Slides
      Video in CDS
    • 11:45 13:00
      Lunch 1h 15m Restaurant

      Restaurant

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    • 13:00 14:00
      New Physics, Dark Matter and the LHC 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Fabio ZWIRNER (University of Padova and CERN)
      Slides
      Video in CDS
    • 14:00 15:00
      Complementarity of Indirect Dark Matter Detection 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Jonathan L. FENG (University of California, Irvine)
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      Video in CDS
    • 15:00 16:00
      Cosmic Rays in the Milky Way and Other Galaxies 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Igor MOSKALENKO (Stanford University)
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      Video in CDS
    • 16:00 16:15
      Break 15m 500-1-001 - Main Auditorium

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    • 16:15 17:00
      It's About Time: Interpreting AMS Antimatter Data in Terms of Cosmic Ray Propagation 45m 500-1-001 - Main Auditorium

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      If cosmic ray positrons come from a secondary origin, then their production spectrum is correlated with the production spectrum of other secondary particles such as boron and antiprotons through scattering cross sections measured in the laboratory. This allows to define a first-principle upper bound on the positron flux at the Earth, independent of propagation model assumptions. Using currently available B/C and antiproton/proton data, we show that the positron flux reported by AMS is consistent with the bound and saturates it at high energies. This coincidence is a compelling indication for a secondary source. We explain how improved AMS measurements of the high energy boron, antiproton, and secondary radioactive nuclei fluxes can corroborate or falsify the secondary source hypothesis. Assuming that the positrons are secondary, we show that AMS data imply a propagation time in the Galaxy of order 1Myr or less for cosmic rays with magnetic rigidity > 300 GV. This corresponds to an average traversed interstellar matter density of ∼ 1 particle/cc, comparable to the density of the Milky Way gaseous disk.
      Speaker: Dr. Kfir BLUM (Institute for Advanced Study, Princeton)
      Slides
      Video in CDS
    • 17:00 18:00
      Acceleration and Transport of Galactic Cosmic Rays 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Vladimir PTUSKIN (IZMIRAN, Moscow)
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      Video in CDS
    • 18:00 18:15
      Break 15m 500-1-001 - Main Auditorium

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    • 18:15 19:15
      Public Lecture: Human Space Exploration 1h 500-1-001 - Main Auditorium

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      Public Lecture in English only. Should you wish to attend to this lecture only (and not the full colloquium), please register here: https://indico.cern.ch/event/386996/registration/ Participants to the full colloquium are automatically registered to the public lectures.
      Speaker: Mr. William H. GERSTENMAIER (NASA)
      Slides
      Video in CDS
    • 08:30 09:00
      The (e− plus e+) Spectrum from AMS 30m 500-1-001 - Main Auditorium

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      We present a measurement of the cosmic ray e+ + e− flux in the range 0.5 GeV to 1 TeV based on the analysis of 10.6 million (e+ + e−) events. The statistics and the resolution of AMS provide a precision measurement of the flux. The flux is smooth and reveals new and distinct information.
      Speaker: Prof. Bruna BERTUCCI (INFN and University of Perugia)
      Slides
      Video in CDS
    • 09:00 09:30
      The Proton Spectrum from AMS 30m 500-1-001 - Main Auditorium

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      A precise measurement of the proton flux in primary cosmic rays with rigidity 1GV to 1.8TV is presented. At rigidities above 50 GV the flux requires a description beyond a single power law.
      Speaker: Dr. Vitaly CHOUTKO (MIT)
      Slides
      Video in CDS
    • 09:30 10:00
      The Helium Spectrum from AMS 30m 500-1-001 - Main Auditorium

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      Speaker: Dr. Sadakazu HAINO (Academia Sinica, Taiwan)
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      Video in CDS
    • 10:00 10:15
      Break 15m 500-1-001 - Main Auditorium

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    • 10:15 11:15
      Indirect Detection: Enhanced Density Models and Antideuteron Searches 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Lisa RANDALL (Harvard University)
      Slides
    • 11:15 12:15
      Background to Dark Matter Searches from Galactic Cosmic Rays 1h 500-1-001 - Main Auditorium

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      Just as searches for BSM physics at the LHC necessitate a careful audit of SM backgrounds, the search for signals of dark matter in cosmic rays must contend with production of secondaries like e+ and pbar through cosmic ray propagation in the Galaxy. The theoretical framework for calculating this has however not been directly calibrated at the high energies being explored by AMS-02 and there may be surprises in store. In particular a nearby source where cosmic rays are being accelerated stochastically can naturally generate a e+ fraction rising with energy as is observed. The test of this is the expected correlated rise in other secondary/primary ratios e.g. B/C and pbar/p. Such a nearby cosmic accelerator should also be detectable through the concomitant flux of neutrinos and its discovery would be (nearly!) as exciting as that of dark matter.
      Speaker: Prof. Subir SARKAR (Oxford, Niels Bohr Institute)
      Slides
      Video in CDS
    • 12:15 14:00
      Lunch 1h 45m restaurant ()

      restaurant

    • 14:00 15:00
      The JEM-EUSO Program 1h 500-1-001 - Main Auditorium

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      CERN

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      JEM-EUSO on board the International Space Station is a mission that aims at unveiling the nature and the origin of the ultra high energy cosmic rays (UHECRs), and to address basic problems of fundamental physics at extreme energies.  The instrument is designed to measure the arrival direction, the energy and, possibly, the nature of these particles. It basically consists of a wide-field of view telescope that looks down from the International Space Station during night-time to detect UV photons  emitted from air showers generated by UHECRs in the atmosphere, in order to identify their individual sources and their association with known nearby astronomical objects. An infrared camera and an atmosphere monitoring system improve the performance of the instrument. The program is proceeding in different steps. At present, K-EUSO attached at the Russian module of the ISS, an improvement of KLYPVE experiment already approved by Roscosmos, is in the stage of final definition. Two pathfinders have already been developed, the first, EUSO-Balloon flew on board a stratospheric balloon in August 2014, a second, EUSO-TA on ground, is in operation at the Telescope Array site. A third, Mini-EUSO, approved by Roscosmos, will be installed inside the ISS. More short and long duration balloon flights are envisaged. 17 Countries, and about 300 researchers are collaborating in JEM-EUSO.
      Speaker: Prof. Piergiorgio PICOZZA (University of Rome Tor Vergata)
      Slides
      Video in CDS
    • 15:00 16:00
      Latest Results from Ice Cube 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Francis HALZEN (University of Wisconsin-Madison)
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      Video in CDS
    • 16:00 16:15
      Break 15m 500-1-001 - Main Auditorium

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    • 16:15 17:15
      Latest Results from the Pierre Auger Observatory and Future Prospects in Particle Physics and High Energy Astrophysics with Cosmic Rays 1h 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Prof. Alan A. WATSON (University of Leeds)
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    • 17:15 18:15
      Latest Results from Fermi-LAT 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Peter MICHELSON (Stanford University)
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    • 18:15 18:30
      Break 15m 500-1-001 - Main Auditorium

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    • 18:30 19:30
      Public Lecture: The Odyssey of Voyager 1h 500-1-001 - Main Auditorium

      500-1-001 - Main Auditorium

      CERN

      385 Route de Meyrin 1217 Meyrin Geneva Switzerland
      400
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      Public Lecture in English only. Should you wish to attend to this lecture only (and not the full colloquium), please register here: https://indico.cern.ch/event/387001/registration/ Participants to the full colloquium are automatically registered to the public lectures.
      Speaker: Prof. Edward C. STONE (CALTECH)
      Slides
      Video in CDS
    • 08:00 08:30
      Scrutinizing Possible Dark Matter Signatures with AMS, Fermi and Planck 30m 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Dr. Tracy SLATYER (MIT)
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      Video in CDS
    • 08:30 09:30
      Super-Symmetric Dark Matter 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Jonathan R. ELLIS (CERN and King's College, London)
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    • 09:30 09:45
      AMS Results on Light Nuclei -B/C 15m 500-1-001 - Main Auditorium

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      Speaker: Dr. Alberto OLIVA (CIEMAT)
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    • 09:45 10:00
      AMS Results on Light Nuclei - Li 15m 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Prof. Laurent M. DEROME (LPSC Grenoble)
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    • 10:00 10:15
      AMS Results on Light Nuclei - C/He 15m 500-1-001 - Main Auditorium

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      Speaker: Dr. Melanie HEIL (MIT)
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    • 10:15 10:30
      Break 15m 500-1-001 - Main Auditorium

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      CERN

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    • 10:30 11:15
      Implications of AMS-02 Experiment 45m 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Prof. Yue-Liang WU (University of Chinese Academy of Sciences)
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    • 11:15 12:15
      The Highest Energy Cosmic Particles 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Angela OLINTO (University of Chicago)
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    • 12:15 12:45
      Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array 30m 500-1-001 - Main Auditorium

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      CERN

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      TA's recent results on Ultra-High Energy Cosmic Rays (UHECRs) are reported. The energy spectrum based on 20k events above 10^18.2 eV demonstrates a clear dip at 10^18.7 eV and a cutoff at 10^19.7 eV , the shape and the energies of which are well described by the GZK process: energy loss of extra-galactic protons by the interaction with the CMB and IR background. The primary composition obtained from the shower maximum analysis using the hybrid technique is consistent with 100% proton or light nuclei, and inconsistent with 100% iron up to 10^19.3 eV. Above the GZK cutoff energy, a large flux enhancement of medium size (radius=20deg) is observed in the direction of Ursa-Major. The chance probability of this hotspot appearing from the isotropic flux is 4.0sigma. The center of the hotspot is 19 deg off from the Super-Galactic Plane, and no obvious candidate of UHECRs is known in this direction.
      Speaker: Prof. Masaki FUKUSHIMA (University of Tokyo)
      Slides
      Video in CDS
    • 12:45 13:30
      Lunch 45m restaurant

      restaurant

      CERN

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    • 13:30 14:30
      Cosmic Ray Energetics and Mass: From Balloons to the ISS 1h 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Prof. Eun-Suk SEO (University of Maryland)
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    • 14:30 15:30
      Latest Results from HESS and the Progress of CTA 1h 500-1-001 - Main Auditorium

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      CERN

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      Speaker: Prof. Werner HOFMANN (Max-Planck Institut Heidelberg)
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    • 15:30 16:30
      Are there currently well motivated and phenomenologically allowed dark matter candidates (besides axions) 1h 500-1-001 - Main Auditorium

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      Speaker: Prof. Gordon KANE (University of Michigan)
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    • 16:30 16:45
      Break 15m 500-1-001 - Main Auditorium

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      CERN

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    • 16:45 17:15
      The Cosmic Fronter at DOE 30m 500-1-001 - Main Auditorium

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      Speaker: Prof. Michael SALAMON (Department of Energy)
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    • 17:15 17:45
      What Next in Fundamental and Particle Physics in Space ? 30m 500-1-001 - Main Auditorium

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      Speaker: Prof. Roberto BATTISTON (ASI - Italian Space Agency and Univ. Trento)
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    • 17:45 18:15
      Summary 30m 500-1-001 - Main Auditorium

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      Speaker: Prof. Samuel TING (CERN and MIT)
      Video in CDS
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