arXiv · 1403.0845
First $\pi K$ atom lifetime and $\pi K$ scattering length measurements
Abstract
The results of a search for hydrogen-like atoms consisting of $\pi^{\mp}K^{\pm}$ 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 ($178 \pm 49$) and from Coulomb final state interaction ($653 \pm 42$). Using these results the analysis yields a first value for the $\pi K$ atom lifetime of $\tau=(2.5_{-1.8}^{+3.0})$ fs and a first model-independent measurement of the S-wave isospin-odd $\pi K$ scattering length $\left|a_0^-\right|=\frac{1}{3}\left|a_{1/2}-a_{3/2}\right|= \left(0.11_{-0.04}^{+0.09} \right)M_{\pi}^{-1}$ ($a_I$ for isospin $I$).
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B. Adeva, L. Afanasyev, Y. Allkofer, C. Amsler, A. Anania, S. Aogaki, A. Benelli, V. Brekhovskikh, T. Cechak, M. Chiba, P. Chliapnikov, C. Ciocarlan, S. Constantinescu, P. Doskarova, D. Drijard, A. Dudarev, M. Duma, D. Dumitriu, D. Fluerasu, A. Gorin, O. Gorchakov, K. Gritsay, C. Guaraldo, M. Gugiu, M. Hansroul, Z. Hons, S. Horikawa, Y. Iwashita, V. Karpukhin, J. Kluson, M. Kobayashi, V. Kruglov, L. Kruglova, A. Kulikov, E. Kulish, A. Kuptsov, A. Lamberto, A. Lanaro, R. Lednicky, C. Mariñas, J. Martincik, L. Nemenov, M. Nikitin, K. Okada, V. Olchevskii, M. Pentia, A. Penzo, M. Plo, T. Ponta, P. Prusa, G. Rappazzo, A. Romero Vidal, A. Ryazantsev, V. Rykalin, J. Schacher, A. Sidorov, J. Smolik, S. Sugimoto, F. Takeutchi, L. Tauscher, T. Trojek, S. Trusov, T. Urban, T. Vrba, V. Yazkov, Y. Yoshimura, M. Zhabitsky, P. Zrelov. 2014-03-04. First $\pi K$ atom lifetime and $\pi K$ scattering length measurements. https://doi.org/10.1016/j.physletb.2014.06.043
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