First pi K atom lifetime and pi K scattering length measurements

0433030 - ÚJF 2015 RIV NL eng J - Článek v odborném periodiku
Adeva, B. - Afanasyev, L. - Allkofer, Y. - Amsler, C. - Anania, A. - Aogaki, S. - Benelli, A. - Brekhovskikh, V. - Čechák, T. - Chiba, M. - Doškářová, P. - Hons, Zdeněk - Klusoň, J. - Lednický, Richard - Průša, P. - Smolík, J. - Trojek, T. - Urban, T. - Vrba, T. - Zrelov, P. … celkem 69 autorů
First pi K atom lifetime and pi K scattering length measurements.
Physics Letters. B. Roč. 735, JUL (2014), s. 288-294. ISSN 0370-2693. E-ISSN 1873-2445
Grant CEP: GA MŠMT(CZ) LG13031; GA MŠMT LG14004
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: DIRAC * QCD
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače; BE - Teoretická fyzika (FZU-D)
Impakt faktor: 6.131, rok: 2014

The results of a search for hydrogen-like atoms consisting of pi K--/+(+/-) mesons are presented. Evidence for pi K atom production by 24 GeV/c protons from CERN PS interacting with a nickel target has been seen in terms of characteristic pi K pairs from their breakup in the same target (178 +/- 49) as well as in terms of produced pi K atoms (653 +/- 42). Using these results, the analysis yields a first value for the pi K atom lifetime of tau = (2.5(-1.8)(+3.0)) fsand a first measurement of the S-wave isospin-odd pi K scattering length vertical bar a(0)(-)vertical bar = 1/3 vertical bar a(1/2) - a(3/2)vertical bar = (0.11(-0.04)(+0.09))M-pi(-1) (a(I) for isospin I).
Trvalý link: http://hdl.handle.net/11104/0237351