Name: Cosmic Rays in the Multi-Messenger Era
Start: 2022-12-05T08:00:00+01:00
End: 2022-12-07T19:00:00+01:00
Location: Paris

lundi 5 décembre
- registration
- Wellcome
  
  Président de session: Dmitri Semikoz (APC, Paris)
- Summary of neutrino workshop
  - 1
    
    A decade of neutrino astronomy
    
    Orateur: Francis Halzen
    
    UCL_APC_Halzen.pdf
  - 2
    
    The future of neutrino astronomy
    
    Orateur: Gwenhael de Wasseige (UC Louvain)
    
    summary_workshop_122022.pdf
  - 3
    
    Astrophysical neutrino models
    
    Orateur: Dmitri Semikoz (APC, Paris)
    
    neutrino_summary_theory.pdf
- 10:40
  
  Coffee
- Cosmic rays at knee
  - 4
    
    Ground Observations of the Spectrum and Composition of Cosmic Rays Below the Knee
    
    Orateur: Juan Carlos Díaz Vélez (Universidad de Guadalajara - CUVALLES)
    
    CRMultiMessenger_Diaz-Velez.pdf
  - 5
    
    Cosmic ray spectrum and composition study with LHAASO
    
    Orateur: Shoushan Zhang (Institute of High Energy Physics, CAS)
    
    Cosmic Rays in the Multi-Messenger Era .pdf
  - 6
    
    Models of cosmic rays at knee
    
    Orateur: Gwenael Giacinti
    
    Cosmic_rays_knee_F.pdf
  - 7
    
    Discussion: knee
- 13:00
  
  Lunch
- Low energy cosmic rays
  - 8
    
    Results from AMS-02
    
    Orateur: Paolo Zuccon (Università degli Studi di Trento and TIFPA)
    
    PZ_CRMME22.pdf
  - 9
    
    Interpretation of the antinuclei data
    
    Orateur: Michael Kachelriess (Department of Physics, NTNU)
    
    kachelriess.pdf
  - 10
    
    Making sense of recent results on electrons and positrons from cosmic ray experiments
    
    Orateur: Carmelo Evoli (n Gran Sasso Science Institute)
    
    Evoli_Paris2022.pdf
    
    slides
- 16:30
  
  coffee
- Low energy cosmic rays
  - 11
    
    Secondary particles in the Galaxy, the role of cross sections
    
    Orateur: Fiorenza Donato (Dept. Theoretical Physics)
    
    Donato.pdf
  - 12
    
    Cosmic Ray abundances
    
    Orateur: Vincent Tatischeff (CSNSM)
    
    VTatischeff_GCR_Composition_2022.pdf
  - 13
    
    Discussion: low energy cosmic rays
- 18:30
  
  Wine and cheese
mardi 6 décembre
- UHECR
  - 14
    
    Results from the Telescope Array
    
    Orateur: John Matthews (University of Utah)
    
    MultiMessenger2022_TA_Latest_Resuts-JNMatthews.pdf
  - 15
    
    Results from Pierre Auger Observatory
    
    Orateur: Ralph Engel (Karlsruhe Institute of Technology)
    
    Auger-selected-highlights-Engel-2022-v1.pdf
  - 16
    
    How uncertain are model predictions for cosmic ray-induced air showers?
    
    Orateur: Dr Sergey Ostapchenko (Frankfurt Institute for Advanced Studies (FIAS))
    
    ostapchenko_CRs.pdf
- 10:30
  
  coffee
- UHECR
  - 17
    
    Ultra-high energy cosmic rays from a population of source
    
    Orateur: Foteni Oikonomou (Norwegian University of Science and Technology)
    
    paris-oikonomou.pdf
  - 18
    
    Radio Galaxies as UHECR sources
    
    Orateur: Björn Eichmann
    
    Eichmann_Paris2022.pdf
  - 19
    
    Discussion: UHECR
- 12:35
  
  Lunch
- UHECR
  - 20
    
    Simulating the evolution Magnetic Fields and CRs in large scale structures
    
    Orateur: Klaus Dolag (USM/LMU)
    
    paris2022_dolag.pdf
  - 21
    
    Propagation of UHECR from sources
    
    Orateur: Alexander Korochkin (ULB)
    
    korochkin_UHECR_propag.pdf
  - 22
    
    Particle acceleration
    
    Orateur: Anatoly Spitkovsky (Univ. Princeton)
    
    Paris_CRs_Spitkovsky_2022_small.pdf
- 15:30
  
  Coffee
- Poster session
  - 23
    
    Ideas to measure the prompt component of the atmospheric muon flux
    
    Extensive air showers arise due to particles coming from the Universe interacting with the atmosphere. In these high-energetic interactions, many particles of different types
    are produced.
    Since muons have a long lifetime and thus a long range compared to other particles in the air shower, they are abundant even on the Earth's surface. These muons are detected with air shower detectors and also underground muon experiments.
    The resulting muon flux is divided into a conventional and a prompt component. The prompt muons come from parent particles with a very short lifetime, causing the spectrum of the prompt
    component nearly to follow the primary spectrum. Particles with lifetimes larger than picoseconds such as pions and kaons live long enough to interact with the atmosphere which results in energy losses. Muons
    from decays of these particles are called conventional and follow a softer energy spectrum.
    
    Ideas to measure the prompt muon flux using the IceCube Neutrino Observatory are presented based on previous analyses. New CORSIKA simulations will be performed in the future and re-weighting should be used to
    create several datasets with different scalings of the prompt component. At the end, an unfolding as well as a fit of the normalization will be performed.
  - 24
    
    Observation of Cosmic-Ray Anisotropy with Eleven Years of IceCube Data
    
    The complete IceCube Observatory has collected over 690 billion cosmic-ray induced muon events from May 2011 to May 2022. These unprecedented statistics make it possible to observe significant structure in in the distribution of cosmic-ray arrival directions at both higher cosmic-ray energies and smaller angular scales. Combined with improved simulation and systematics, we can provide a newly detailed assessment of the energy- and time-dependence of the cosmic-ray anisotropy in the Southern Hemisphere. We present the preliminary results from a study with the extended event
    sample.
    
    CR Anisotropy MultiMessenger 2022.pdf
  - 25
    
    Anisotropies studies in the arrival directions of Ultrahigh-Energy Cosmic Rays
    
    The study of ultrahigh-energy cosmic rays contributes to a better understanding of the Universe. In particular, the study of anisotropy in their arrival directions is of key importance to unraveling the sources of such particles. The Pierre Auger Observatory, the largest cosmic ray observatory in the world, collected an unprecedentedly large
    data set over 17 years of operation. In this work, we describe anisotropy-related results obtained by using such events. These are the large-scale searches in the arrival direction of events detected with energies above 4 EeV and the analysis of arrival directions of the highest-energy events, exceeding 32 EeV. A remarkable dipolar modulation in right ascension for energies above 8 EeV is observed, as previously reported, with a statistical significance of 6.6$\sigma$ as well as evidence of anisotropy at intermediate angular scale with $\sim15^{ \circ}$ Gaussian spread at 4$\sigma$ significance level for cosmic-ray energies above $\sim$ 40 EeV.
  - 26
    
    Magnetic diffusion and interaction effects on Ultrahigh Energy Cosmic Rays
    
    Magnetic fields present in the Universe and interactions with the cosmic radiation backgrounds play an important role in shaping the flux of the ultrahigh energy cosmic rays reaching the Earth. To account for these processes we include in the SimProp cosmic ray propagation code the effect of a turbulent magnetic field through a stochastic deflection term in the trajectories. We compute the suppression of the spectrum due to the magnetic horizon effect, both for primary nuclei and for the (secondary) nuclei resulting from the photodisintegration of the primary ones. We provide analytic parameterizations of this effect as a function of the magnetic field parameters, and of the density of cosmic ray sources. This allows us to obtain the expected spectra in the presence of the magnetic fields from the one that would be obtained in their absence. We also discuss how the discreteness of the distribution of sources affects the spectrum of cosmic rays at the highest energies.
  - 27
    
    Search for photons at the Pierre Auger Observatory
    
    The Pierre Auger Observatory is the largest and most accurate air-shower experiment in the world. An essential characteristic of the Pierre Auger Observatory is the hybrid concept, combining a Surface Detector array (SD) with a Fluorescence Detector (FD), offering a large exposure and unique discrimination capabilities to photons with energy above $10^{17}$ eV. The analysis of data taken over 18 years, in hybrid mode as well as with the SD alone, allows various searches for UHE photons including the search for a diffuse UHE photon flux, a flux from point sources of UHE photons, and UHE photons from sources of Gravitational Wave events.
  - 28
    
    The Underground Muon Detector of the Pierre Auger Observatory
    
    Ultrahigh-energy cosmic rays are a mystery at the frontier of high-energy particle physics and astronomy. The Pierre Auger Observatory is currently the largest detector for ultrahigh-energy cosmic rays in the world and will continue to search for the origins of cosmic rays at the highest energies in its second phase of operation. We will present the potential and the functionality of the Underground Muon Detector (UMD) that will allow for a direct measurement of the muon component in air showers providing the Pierre Auger Observatory an enhanced sensitivity of the primary mass of ultrahigh-energy cosmic rays. The UMD is being deployed as a part of a greater upgrade named AugerPrime, which will make Auger an event-by-event mass-sensitive observatory for cosmic-ray physics and multi-messenger astronomy. The UMD will be mostly efficient at primary energies above 10^16.5 eV and will primarily be used to directly measure the mass composition in the cosmic ray spectrum below the ankle region and to enhance the capabilities of photon-hadron discrimination at these energies.
  - 29
    
    High-energy lepton and photon simulations with the framework PROPOSAL
    
    Modern analysis methods in cosmic ray physics rely on precise and efficient simulations of high-energy particles.
    To simulate the propagation of charged leptons and photons, the tool PROPOSAL has been developed.
    It provides a 3D Monte Carlo simulation optimized for high-energy particles, usable in C++ and Python.
    
    We present the simulation framework PROPOSAL and a selection of its applications in astroparticle physics.
    This includes neutrino observatories like the IceCube Neutrino Observatory, the imaging technique muography, and the usage of PROPOSAL in the new air shower simulation framework CORSIKA 8.
    Additionally, the latest study to estimate the impact of muon deflections on directional reconstructions using PROPOSAL is shown.
- 20:00
  
  Conference dinner
mercredi 7 décembre
- Gamma-rays from Galaxy
  - 30
    
    3D maps of the local ISM
    
    Orateur: Rosine Lallement (GEPI Observatoire de Paris / PSL*)
    
    pres_lallement_3D_CRs.pdf
  - 31
    
    New Constraints on the Global Structure of the Coherent Galactic Magnetic Field
    
    Orateur: Michael Unger (KIT)
    
    Unger_paris.pdf
  - 32
    
    Recent results on sub-PeV gamma-ray observation by the Tibet ASgamma experiment
    
    Orateur: Masato Takita (ICRR, The University of Tokyo)
    
    Cosmic_Rays_in_Multimessenger_Era_takita_20221207_v1.pdf
- 10:30
  
  coffee
- Gamma-rays from Galaxy
  - 33
    
    Gamma-ray measurements by LHAASO experiment
    
    Orateur: Quiang Yuan (TBC)
    
    2022_LHAASO_YuanQ.pdf
  - 34
    
    Cosmic ray acceleration and multi-messenger radiation from wind bubbles
    
    Orateur: Enrico Peretti (Niels Bohr Institute)
    
    Peretti-Paris-WindBubbles.pdf
  - 35
    
    Pulsar Wind Nebulae: the wondrous machines of High-Energy Astrophysics
    
    Orateur: Niccolo' Bucciantini (INAF - Arcetri)
    
    Bucciantini_Paris_2022.pdf
- 12:30
  
  Lunch
- Gamma-rays from Galaxy
  - 36
    
    Limits on out of plane diffused gamma rays
    
    Orateur: Yevgen Vovk (University of Tokyo)
    
    Vovk - Limits on out of plane diffuse gamma rays.pdf
  - 37
    
    Diffuse gamma-ray emission from Milky Way
    
    Orateur: Francesco Vilante (TBC) (LNGS)
    
    villante_Parigi22.pdf
  - 38
    
    Diffuse gamma-ray emission from local sources
    
    Orateur: Sergey Koldobskiy (Oulu University)
    
    Koldobskiy_Paris.pdf
- 15:30
  
  coffee
- Summary talk
  - 39
    
    Summary talk
    
    Orateur: Pasquale Blasi (GSSI)
    
    SummaryParis.pdf
- Final discussion

Cosmic Rays in the Multi-Messenger Era

APC Laboratory

Paris