Search for fingerprints of disoriented chiral condensates in cosmic ray showers

Abstract

Although the generation of disoriented chiral condensates (DCCs), where the order parameter for chiral symmetry breaking is misaligned with respect to the vacuum direction in isospin state, is quite natural in the theory of strong interactions, they have so far eluded experiments in accelerators and cosmic rays. If DCCs are formed in high-energy nuclear collisions, the relevant outcome are very large event-by-event fluctuations in the neutral-to-charged pion fraction. In this note we search for fingerprints of DCC formation in observables of ultra-high energy cosmic ray showers. We present simulation results for the depth of the maximum ($X_{max}$) and number of muons on the ground, evaluating their sensitivity to the neutral-to-charged pion fraction asymmetry produced in the primary interaction.

7 pages, 4 figures

References in corpus (6)

• Equation of state and QCD transition at finite temperature
• Measurement of the Depth of Maximum of Extensive Air Showers above 10^18 eV
• Measurement of the energy spectrum of cosmic rays above 10^18 eV using the Pierre Auger Observatory
• Hydrodynamical instabilities in an expanding quark gluon plasma
• Effects from inhomogeneities in the chiral transition
• Statistical methods applied to composition studies of ultrahigh energy cosmic rays