First πK atom lifetime and πK scattering length measurements

Autor: M. Nikitin, J. Saborido, E. Kulish, L. Afanasyev, A. Romero Vidal, V.I. Rykalin, D. Fluerasu, M. Zhabitsky, V. Karpukhin, M. Plo, L. Kruglova, P. Zrelov, A. Gorin, P. Doskarova, V. Kruglov, A. Anania, Claude Amsler, L. Nemenov, Y. Allkofer, M. Pentia, L. Tauscher, R. Lednicky, V. Yazkov, S. Constantinescu, O. Gorchakov, J. Schacher, C. Ciocarlan, T. Ponta, T. Vrba, Z. Hons, P. Chliapnikov, V. Olchevskii, K. Gritsay, C. Guaraldo, Masami Chiba, Fujio Takeutchi, T. Urban, S.V. Trusov, V. Brekhovskikh, Carlos Marinas, Masaaki Kobayashi, Bernardo Adeva, Yoshihisa Iwashita, A. Benelli, A. I. Kulikov, M. Gugiu, J. Smolik, D. Drijard, A. Lamberto, A. Dudarev, T. Trojek, A. Penzo, A.V. Kuptsov, S. Horikawa, D. Dumitriu, K. Okada, J. Kluson, A. Ryazantsev, J. Martincik, M. Hansroul, Y. Yoshimura, A. Sidorov, G.F. Rappazzo, M. Duma, Tomáš Čechák, Armando Lanaro, S. Aogaki, P. Prusa, S. Sugimoto
Rok vydání: 2014
Předmět:
Zdroj: Amsler, Claude; Schacher, Jürg (2014). First πK atom lifetime and πK scattering length measurements. Physics letters. B, 735, pp. 288-294. Elsevier 10.1016/j.physletb.2014.06.043
Physics Letters B
ISSN: 0370-2693
Popis: 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 $I$).
Comment: 14 pages, 8 figures
Databáze: OpenAIRE
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