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The CZELTA experiment is a part of multinational program to study cosmic rays with energies above 1014 eV. We describe the technical design of the station ALTA/CZELTA for the detection of high energy cosmic rays and mention present status of the project in the Czech Republic.
In LHC physics we study the spin correlation of top-antitop pairs production to investigate the production mechanism of heavy quarks[F. Hubard et al. Eur. Phys. J. C 44 (2006) 13]. The s-channel process mediated by graviton Kaluza-Klein modes in ADD model with several extra dimensions[N. Arkani-Hamed, S. Dimopoulos and G. Dvali, Phys. Lett. 429B (1998) 263, hep-ph/9803315] or in the Randall-Sundrum...
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