Fingerprints of disoriented chiral condensates in cosmic ray showers

Autor(es)

de Almeida, R. M. ^{[1, 2]} ; de Mello Neto, J. R. T. ^[1] ; Fraga, E. S. ^[1] ; Santos, E. M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil

^[2] Univ Fed Fluminense, EEIMVR, BR-27255125 Volta Redonda, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Astroparticle Physics; v. 37, p. 75-80, SEP 2012.
• Citações Web of Science: 0

Resumo

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. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/04259-0 - Raios cósmicos de altas energias
• Beneficiário: Luiz Vitor de Souza Filho
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores