Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1...85b&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
1
Scientific paper
Phenomenon of coplanar emission of secondary particles in superhigh energy nuclear interactions is investigated through the study of structure of γ -ray families detected in Pamir emulsion chamb er experiment. To increase sensitivity of γ -family structure to anisotropy of the interaction predominantly contributing to the observed family, decascading of electromagnetic cascades into initial γ -rays and their subsequent coupling in π 0 -mesons were performed. The probability to observe super energy families with aligned multi-core structures composed of 4 or 5 highest energy reconstructed neutral pions is higher than that predicted in QGSJet model by 3.5 standard deviations. The energy-lateral characteristics of the aligned multi-core pion structures favors the hypothesis of high pT production of coplanar pions (pT ˜ 3 TeV/c). The estimated energy threshold for production of coplanar events is as high as E0 ˜ 8 PeV.
Maximenko M. V.
Mukhamedshin R. A.
Puchkov S. V.
Sergeevich Borisov A.
Slavatinsky S. A.
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