Workshop on the tuning of hadronic interaction models

22 Jan 2024, 14:00 → 25 Jan 2024, 16:00 Europe/Berlin

Guesthouse, Campus Freudenberg (University Wuppertal)

Karl-Heinz Kampert (Bergische Universität Wuppertal), Hans Dembinski (TU Dortmund), Chloé Gaudu (Bergische Universität Wuppertal), Johannes Albrecht (TU Dortmund), Kevin Kröniger (TU Dortmund)

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.

Monday, 22 January

14:00 → 14:10 Welcome

Speaker: Karl-Heinz Kampert (Department of Physics)

Workshop-Intro.pdf

14:20 → 14:50 Tuning of event generators with accelerator and astroparticle experiments

Speaker: Hans Dembinski (TU Dortmund)

dembinski.pdf

15:00 → 16:00 Accelerator input

15:00 LHCb colliding-beam measurements for astroparticle physics

LHCb colliding-beam measurements for astroparticle physics

Speaker: Michael Schmelling

talk.pdf

15:25 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 → 16:30 Coffee break

16:30 → 17:50 Generators & Theory

16:30 Pythia 8 Overview

Pythia 8 Overview

Speaker: Torbjörn Sjöstrand (Lund University)

pythia8wuppertal.pdf

17:05 Sibyll-2.3d and SIBYLL-STAR

Speaker: felix riehn (igfae, usc, santiago de compostela)

sibyll-star-hadTuneWorkshop-2024-v1.pdf

17:30 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

09:00 → 10:30 Generators & Theory

09:00 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

09:25 EPOS4 overview

EPOS4 overview

Speaker: Klaus Werner (SUBATECH)

wuppertal.pdf

09:50 EPOS-LHCR

Speaker: Tanguy Pierog (KIT, IAP)

Pierog_EPOS_LHC-R_2024.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 Particle transport in matter

11:00 CORSIKA 8 overview

Speaker: Alexander Sandrock (Bergische Universität Wuppertal)

Sandrock.pdf

11:25 MCEq for atmospheric lepton flux calculation

Speaker: Anatoli Fedynitch (Institute of Physics, Academia Sinica, Taipei, Taiwan)

20240123_Wuppertal_Anatoli.pdf

11:50 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 → 13:55 Lunch break

13:55 → 14:00 About train driver's strike

Speaker: Hans Dembinski (TU Dortmund)

train strike.pdf

14:00 → 16:00 Astroparticle input

14:00 Overview on UHECR interactions

Speaker: Ralph Engel (Karlsruhe Institute of Technology (KIT))

Overview-UHECR-Interactions-Engel-2024-v1.pdf

14:25 The role of direct muon measurements in Auger

Speaker: Markus Roth (KIT)

Direct muon detection at Auger - MRoth.pdf

14:50 KASCADE

Speaker: Andreas Haungs (Baden)

Tuning_Wuppertal_2024_KASCADE_haungs.pdf

15:15 WHISP

Speaker: Lorenzo Cazon (IGFAE - University of Santiago de Compostela)

WHISP_Tuning2024.pdf

16:00 → 16:30 Coffee break

16:30 → 18:00 Particle transport in matter

16:30 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

16:55 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

17:20 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

09:00 → 09:50 Accelerator input

09:00 Fixed target experiments at the LHC: SMOG and SMOG2 at LHCb

Speaker: Giacomo Graziani (INFN, Sezione di Firenze)

graziani_lhcbFT.pdf

09:25 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

09:50 → 10:30 Tuning of event generators

09:50 A RIVETing journey: Analysis Preservation and Generator Tuning in High Energy Physics

A RIVETing journey: Analysis Preservation and Generator Tuning in High Energy Physics

Speaker: Lars Kolk (TU Dortmund)

TuningWorkshop_LarsKolk_24_01_24.pdf

TuningWorkshop_LarsKolk_24_01_24.pptx

10:30 → 11:00 Coffee break

11:00 → 12:30 Tuning of event generators

11:00 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

11:25 Tuning of Pythia 8 for simulations of UHECR induced air showers

Speaker: Chloé Gaudu (Bergische Universität Wuppertal)

24_01_2024_Gaudu.pdf

11:50 Tuning with Bayesian methods

Speaker: Michael Windau (TU Dortmund)

tuningworkshop_240124_mwindau.pdf

12:30 → 14:00 Lunch break

14:00 → 16:00 Astroparticle input

14:00 Relevance of hybrid data to the tuning of hadronic interaction models

Relevance of hybrid data to the tuning of hadronic interaction models

Speaker: Jakub Vícha (FZU - Institute of Physics of Czech Academy of Sciences)

HybridObservables_TuningWorkshop_2024.pdf

14:25 Radio Detection and its relevance for studying air shower physics

Radio Detection and its relevance for studying air shower physics

Speaker: Tim Huege (Karlsruher Institut für Technologie)

huege-Radio-WuppertalHadronicInteractionsWorkshop.pdf

14:50 IceTop observables for tuning

Speaker: Dennis Soldin

TuningWorkshop2024_DSoldin.pdf

15:15 IceCube observables for tuning

Speaker: Mirco Hünnefeld (TU Dortmund University)

2024_01_24__sfb1491_wuppertal.pdf

16:00 → 16:30 Coffee break

16:30 → 16:55 Astroparticle input

16:30 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

16:55 → 17:20 Generators & Theory

16:55 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

17:20 → 18:00 Tuning of event generators

17:20 Tuning in the far forward region for FASER

Speaker: Max Fieg

TuningPythiaFPF_HadInt.pdf

19:00 → 20:30 Social dinner in a restaurant

Thursday, 25 January

09:00 → 09:35 Accelerator input

09:00 ALICE measurements for tuning

Speaker: Antonin MAIRE (IPHC-CNRS IN2P3 (Strasbourg))

Conf-2024-01-Workshop-MCtuningForCosmicRays-2024-01-25.pdf

09:35 → 11:00 Generators & Theory

09:35 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

10:00 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

11:00 → 11:10 Summary and final remarks on the workshop

Speakers: Hans Dembinski (TU Dortmund), Karl-Heinz Kampert (Department of Physics)