Measurement Of The Pi K Atom Lifetime And The Pi K Scattering Length

Bernardo Adeva, L. Kruglova,C. Mariñas,M. Kobayashi,A. Romero Vidal, C. Amsler,M. Plo,L. Tauscher, A. Penzo,Z. Hons, D. Drijard,T. Trojek, A.M. Gorin,V. Brekhovskikh, S. Trusov,Yoshihisa Iwashita,S. Horikawa,S. Aogaki,J. Schacher,P. Federicova, Alexander V. Sidorov,J. Kluson, K. Gritsay,A. Ryazantsev,Y. Yoshimura,M. Pentia,Y. Allkofer, K. Okada,M. Gugiu, V.I. Rykalin,T. Cechak, P. Chliapnikov,F. Takeutchi, D. Dumitriu, L. Nemenov, G. F. Rappazzo,T. Vrba,J. Smolik, M. Nikitin, M. Hansroul, A. Lanaro, V. Yazkov,A. Lamberto,O. Gorchakov, D. Fluerasu,A. Benelli, A. Anania,Richard Lednicky,C. Guaraldo, E. Kulish,A. Dudarev,V. Karpukhin,M. Zhabitsky, J. Saborido, A. Kuptsov,P. Zrelov,J. Martincik, V. Olchevskii,M. Chiba,A. I. Kulikov,T. Urban,Petr Prusa, V. Kruglov

PHYSICAL REVIEW D（2017）

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摘要

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).

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