Observation of pi K--(+) and pi K-+(-) Atoms

0463934 - ÚJF 2017 RIV US eng J - Článek v odborném periodiku
Adeva, B. - Benelli, A. - Čechák, T. - Doškářová, P. - Hons, Zdeněk - Klusoň, J. - Lednický, Richard - Martinčík, J. - Okada, K. - Průša, P. - Smolík, J. - Trojek, T. - Urban, T. - Vrba, T. … celkem 64 autorů
Observation of pi K--(+) and pi K-+(-) Atoms.
Physical Review Letters. Roč. 117, č. 11 (2016), s. 112001. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT(CZ) LG13031
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: Center of mass * Nickel foils * Standard deviation
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače; BF - Elementární částice a fyzika vys. energií (FZU-D)
Impakt faktor: 8.462, rok: 2016

The observation of hydrogenlike pi K atoms, consisting of pi K--(+) or pi K-+(-) mesons, is presented. The atoms are produced by 24 GeV/c protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionization) of pi K atoms in the same targets yields characteristic pi K pairs, called "atomic pairs," with small relative momenta Q in the pair center-of-mass system. The upgraded DIRAC experiment observed 349 +/- 62 such atomic pi K pairs, corresponding to a signal of 5.6 standard deviations. This is the first statistically significant observation of the strange dimesonic pi K atom.
Trvalý link: http://hdl.handle.net/11104/0263014