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Workshop on the tuning of hadronic interaction models

→ Europe/Berlin
Guesthouse, Campus Freudenberg (University Wuppertal)

Guesthouse, Campus Freudenberg

University Wuppertal

Rainer Gruenter-Str. 3, 42119 Wuppertal
Karl-Heinz Kampert (Bergische Universität Wuppertal), Hans Dembinski (TU Dortmund), Chloé Gaudu (Bergische Universität Wuppertal), Johannes Albrecht (TU Dortmund), Kevin Kröniger (TU Dortmund)
Description

The purpose of the workshop is to bring together experts working in

  • simulations and measurements of cosmic ray induced air showers, 
  • event generators and hadronic interaction models, employed in EAS simulations, and 
  • accelerator experiments aimed at providing data that help to test and improve such interaction models.

We plan for a structure that allows ample discussions triggered by presentations related to testing and improving hadronic interactions models. 

This workshop is supported by the Collaborative Research Center SFB 1491.

Registrations are closed.

Contact
Participants
  • Monday 22 January
    • 1
      Welcome
      Speaker: Karl-Heinz Kampert (Department of Physics)
      Workshop-Intro.pdf
    • 2
      Tuning of event generators with accelerator and astroparticle experiments
      Speaker: Hans Dembinski (TU Dortmund)
      dembinski.pdf
    • Accelerator input
      • 3
        LHCb colliding-beam measurements for astroparticle physics

        LHCb colliding-beam measurements for astroparticle physics

        Speaker: Michael Schmelling
        talk.pdf
      • 4
        Measurements of Relevance for Cosmic-Ray Physics with NA61/SHINE

        Measurements of Relevance for Cosmic-Ray Physics with NA61/SHINE

        Speaker: Michael Unger
        wuppertalv2.pdf
    • 16:00
      Coffee break
    • Generators & Theory
      • 5
        Pythia 8 Overview

        Pythia 8 Overview

        Speaker: Torbjörn Sjöstrand (Lund University)
        pythia8wuppertal.pdf
      • 6
        Sibyll-2.3d and SIBYLL-STAR
        Speaker: felix riehn (igfae, usc, santiago de compostela)
        sibyll-star-hadTuneWorkshop-2024-v1.pdf
      • 7
        Hadronic interactions in Angantyr

        In recent times, the Pythia event generator has been extended to feature simulations of generic hadron-nucleon interactions. In this talk, I present a further extension to hadron-ion interactions, which are of particular relevance for air showers where hadronic cascades interact with nuclei in the air.

        The model has been validated against NA61/SHINE data. The model also has applications to the vector-meson dominance component of photo-induced processes, and in this context has been found to give a good description of HERA and ATLAS data.

        Speaker: Marius Utheim
        Hadronic Interactions in Angantyr.pdf
  • Tuesday 23 January
    • Generators & Theory
      • 8
        Air shower predictions of QGSJET-III and model uncertainties for Xmax

        I shall discuss new theoretical approaches implemented in the QGSJET-III Monte Carlo generator and present selected model results regarding secondary hadron production in hadron-proton and hadron-nucleus collisions. The predictions of the model for basic characteristics of proton-induced extensive air showers (EAS) will be compared to the ones of QGSJET-II and of other cosmic ray interaction models. In the second part of my talk, I shall concentrate on potential model uncertainties regarding predictions for EAS maximum depth.

        Speaker: Sergey Ostapchenko (Hamburg University, II Institute for Theoretical Physics)
        wuppertal-ostapchenko.pdf
      • 9
        EPOS4 overview

        EPOS4 overview

        Speaker: Klaus Werner (SUBATECH)
        wuppertal.pdf
      • 10
        EPOS-LHCR
        Speaker: Tanguy Pierog (KIT, IAP)
        Pierog_EPOS_LHC-R_2024.pdf
    • 10:30
      Coffee break
    • Particle transport in matter
      • 11
        CORSIKA 8 overview
        Speaker: Alexander Sandrock (Bergische Universität Wuppertal)
        Sandrock.pdf
      • 12
        MCEq for atmospheric lepton flux calculation
        Speaker: Anatoli Fedynitch (Institute of Physics, Academia Sinica, Taipei, Taiwan)
        20240123_Wuppertal_Anatoli.pdf
      • 13
        atmospheric flux calculations and LHC input

        I discuss the calculations of atmospheric fluxes (prompt and conventional)
        and LHC input useful for it.

        Speaker: Maria Vittoria Garzelli (II Institut fuer Theoretische Physik, Universitaet Hamburg)
        semwup.pdf
    • 12:30
      Lunch break
    • 14
      About train driver's strike
      Speaker: Hans Dembinski (TU Dortmund)
      train strike.pdf
    • Astroparticle input
    • 16:00
      Coffee break
    • Particle transport in matter
      • 19
        Air shower genealogy

        genealogical studies of EM and hadron/muon EAS component with CORSIKA 8 and comparisons with Heitler-Matthews model

        Speaker: Maximilian Reininghaus
        presentation.pdf
        presentation_public.pdf
      • 20
        Strangeness enhancements and the muon excess in extensive air showers

        Several high-energy cosmic-ray experiments have observed an excess of muons compared to theoretical expectations from air shower simulations based on standard hadronic interaction models. We investigate the potential of producing states of dense quark-gluon matter (so-called fireballs) to resolve the excess of muons on the ground for a given depth of the shower maximum. Adopting a phenomenological fireball model, we find that the inelasticity enhancement associated with the formation of a plasma state is in tension with data on the electromagnetic longitudinal shower development. We then restrict the fireball model to only enhance the strangeness produced in Standard Model hadronic interactions, and dub this model the strangeball model. Comparing with air shower measurements we find strangeball parameters that resolve the muon puzzle. Constraints from data on shower-to-shower fluctuations of the muon number require strangeness enhancements already at energies accessible to current-generation collider experiments. The strangeball
        hypothesis leads to a 5–9% increase of the average fraction of energy retained in the hadronic cascade compared to predictions from current hadronic interaction models. A comparison with relevant measurements of the LHCf and LHCb detectors does not directly exclude this scenario, though the obtained tension with LHCb suggests a stringent test at 14 TeV.

        Based mainly on Manshanden, Sigl and Garzelli, JCAP02 (2023) 017.

        Speaker: Guenter Sigl (Universität Hamburg)
        strangeball-model.pdf
      • 21
        CRPropa: overview and embedded hadronic interactions

        CRPropa 3.2, released recently, is the latest update in a continued effort to maintain and extend this open-source code well known in the cosmic-ray community. Originally aimed at simulating the ballistic propagation and interactions of Ultra-High Energy Cosmic Rays, today it can handle diffusive propagation of cosmic rays in a variety of magnetic fields, deal with stochastic cosmic ray acceleration, model electromagnetic cascades for gamma ray emission and transport, among other capabilities. Of special interest is the introduction of hadronic interactions to facilitate the treatment of cosmic ray interactions in the galaxy and within the sources. This talk provides an up-to-date overview of the code and details the recently implemented hadronic interactions.

        Speaker: Leonel Morejon (BUW)
        TuningHIMs_23.01.2024.pdf
  • Wednesday 24 January
    • Accelerator input
      • 22
        Fixed target experiments at the LHC: SMOG and SMOG2 at LHCb
        Speaker: Giacomo Graziani (INFN, Sezione di Firenze)
        graziani_lhcbFT.pdf
      • 23
        Models and Measurements of Antiproton Production for Cosmic-Ray Studies

        Models and Measurements of Antiproton Production for Cosmic-Ray Studies

        Speaker: Thomas Pöschl (CERN)
        poeschl_Wuppertal.pdf
    • Tuning of event generators
    • 10:30
      Coffee break
    • Tuning of event generators
      • 25
        MCPLOTS : MC validation resource based on volunteer computing

        We present the MCPLOTS online resource for MC event-generator validations. The project is based on the RIVET analysis library and harnesses volunteer computing to generate high-statistics MC comparisons to data. Users interact with the resource via a simple web site, mcplots.cern.ch, where run cards, histogram points, etc, are all made easily available for download. The project has been structured to enable community-driven developments, and we discuss the computational back end, the web front end, and possibilities for further extensions and collaboration.

        Speaker: Natalia Korneeva (Monash University)
        mcplots-wuppertal.pdf
      • 26
        Tuning of Pythia 8 for simulations of UHECR induced air showers
        Speaker: Chloé Gaudu (Bergische Universität Wuppertal)
        24_01_2024_Gaudu.pdf
      • 27
        Tuning with Bayesian methods
        Speaker: Michael Windau (TU Dortmund)
        tuningworkshop_240124_mwindau.pdf
    • 12:30
      Lunch break
    • Astroparticle input
    • 16:00
      Coffee break
    • Astroparticle input
      • 32
        Modified Hadronic Interactions in CORSIKA 7

        Ulrich et al. have shown already in 2011 that changing the cross-section, elasticity and multiplicity of hadronic interactions at very high energies with respect to the standard hadronic interaction models has a direct impact on predicted depths of the shower maxima and numbers of muons at ground. We have expanded this work from the original 1D implementation in CONEX to full 3D simulations in CORSIKA, allowing us to quantify the effects of the modified interactions on other observables. We find that satisfying the latest constraints from the Pierre Auger Observatory on the number of muons at 1000 meters from the shower axis and depth of shower maximum simultaneously is challenging, but possible within a reasonable space of modifications.

        Speaker: Jan Ebr (FZU - Institute of Physics of the Czech Academy of Sciences)
        prezentace-wuppertal2024.pdf
    • Generators & Theory
      • 33
        Introduction and overview of the UrQMD model for p+A and A+A reactions

        This talk provides an introduction into the Ultra-relativistic Quantum Molecular Dynamics model (UrQMD). UrQMD is a well established transport approach to simulate hadron-hadron, hadron+nucleus and nucleus+nucleus reactions at beam energies starting from 1 GeV to center-of-mass energies of a few hundred GeV. UrQMD has been well tested against a wide range of accelerator data for various collision systems and allows to obtain a full momentum distribution of all final state particles.

        Speaker: Prof. Marcus Bleicher (Uni Frankfurt)
        2024_Bleicher_Wuppertal.pdf
    • Tuning of event generators
    • 19:00
      Social dinner in a restaurant
  • Thursday 25 January
    • Accelerator input
    • Generators & Theory
      • 36
        Status of nuclear-PDF analyses and prospects with light ions

        Status of nuclear-PDF analyses and prospects with light ions

        Speaker: Petja Paakkinen (University of Jyväskylä)
        Paakkinen_nPDFs_Wuppertal.pdf
      • 37
        Chromo: An event generator frontend for particle and astroparticle physics

        Chromo: An event generator frontend for particle and astroparticle physics

        Speaker: Anton Prosekin (Institute of Physics, Academia Sinica, Taipei, Taiwan)
        Chromo_wuppertal.pdf
    • 38
      Summary and final remarks on the workshop
      Speakers: Hans Dembinski (TU Dortmund), Karl-Heinz Kampert (Department of Physics)
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