Basic Features of High-Energy Hadronic Interactions

The differences between contemporary Monte Carlo generators of high energy hadronic interactions are discussed and their impact on the interpretation of experimental data on ultra-high energy cosmic rays (UHECRs) is studied. Key directions for further model improvements are outlined. The prospect for a coherent interpretation of the data in terms of the UHECR composition is investigated.

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Calibrating the In-Medium Behavior of Quarkonia

Advances in High Energy Physics ◽

10.1155/2013/242918 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 21

Author(s):

Helmut Satz

Keyword(s):

High Energy ◽

Heavy Flavor ◽

Nuclear Collisions ◽

Quarkonium Production ◽

Essential Question ◽

Model Independent ◽

Production Pattern ◽

Basic Features

Quarkonium production has been considered as a tool to study the medium formed in high-energy nuclear collisions, assuming that the formation of a hot and dense environment modifies the production pattern observed in elementary collisions. The basic features measured there are the relative fractions of hidden to open heavy flavor and the relative fractions of the different hidden heavy flavor states. Hence the essential question is if and how these quantities are modified in nuclear collisions. We show how the relevant data must be calibrated; that is, what reference has to be used, in order to determine this in a model-independent way.

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Relation between hadronic interactions and ultra-high energy extensive air showers

EPJ Web of Conferences ◽

10.1051/epjconf/20159911001 ◽

2015 ◽

Vol 99 ◽

pp. 11001 ◽

Cited By ~ 1

Author(s):

Ralf Ulrich ◽

Colin Baus ◽

Ralph Engel

Keyword(s):

High Energy ◽

Extensive Air Showers ◽

Ultra High Energy ◽

Air Showers ◽

Hadronic Interactions

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Average shape of longitudinal shower profiles measured at the Pierre Auger Observatory

EPJ Web of Conferences ◽

10.1051/epjconf/201921002015 ◽

2019 ◽

Vol 210 ◽

pp. 02015

Author(s):

Sofia Andringa ◽

Keyword(s):

Cosmic Ray ◽

High Energy ◽

Pierre Auger Observatory ◽

Composition Analysis ◽

Shape Parameters ◽

Hadronic Interactions ◽

Shower Development ◽

Shower Maximum ◽

Detailed Composition ◽

First Time

The average profiles of cosmic ray shower development as a function of atmospheric depth are measured for the first time with the Fluorescence Detectors at the Pierre Auger Observatory. The profile shapes are well reproduced by the Gaisser-Hillas parametrization at the 1% level in a 500 g/cm2 interval around the shower maximum, for cosmic rays with log(E/eV) > 17.8. The results are quantified with two shape parameters, measured as a function of energy. The average profiles carry information on the primary cosmic ray and its high energy hadronic interactions. The shape parameters predicted by the commonly used models are compatible with the measured ones within experimental uncertainties. Those uncertainties are dominated by systematics which, at present, prevent a detailed composition analysis.

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