Measurement of the pi K atom lifetime and the pi K scattering length

0480642 - ÚJF 2018 RIV US eng J - Journal Article
Adeva, B. - Afanasyev, L. - Allkofer, Y. - Amsler, C. - Anania, A. - Aogaki, S. - Benelli, A. - Brekhovskikh, V. - Čechák, T. - Federičová, P. - Hons, Zdeněk - Klusoň, J. - Lednický, Richard - Martinčík, J. - Průša, P. - Smolík, J. - Trojek, T. - Urban, T. - Vrba, T. … Total 64 authors
Measurement of the pi K atom lifetime and the pi K scattering length.
Physical Review D. Roč. 96, č. 5 (2017), č. článku 052002. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT(CZ) LG13031
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : DIRAC collaboration * atom lifetime * cross sections
OECD category: Nuclear physics; Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) (FZU-D)
Impact factor: 4.394, year: 2017

After having announced the statistically significant observation (5.6s) of the new exotic pi K atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full pi K data sample: tau = (5.5(-2.8)(+5.0)) x 10(-15) s. By means of a precise relation (approximate to 1%) between atom lifetime and scattering length, the following value for the S-wave isospin-odd pi K scattering length a(0)(-) = 1/3 (a(1/2) - a(3/2)) has been derived: |a(0)(-)| = (0.072(-0.020)(+0.031)) M-pi(-1).
Permanent Link: http://hdl.handle.net/11104/0276372