Measurement of the πK atom lifetime and the πK scattering length
| Autor: | L. Nemenov, L. Tauscher, Claude Amsler, P. Federicova, E. Kulish, P. Chliapnikov, Bernardo Adeva, D. Fluerasu, R. Lednicky, A. Anania, Y. Allkofer, V.I. Rykalin, J. Schacher, P. Zrelov, S. Horikawa, A. Romero Vidal, T. Vrba, C. Guaraldo, S. Aogaki, K. Gritsay, S.V. Trusov, P. Prusa, Carlos Marinas, M. Zhabitsky, A. Lamberto, A. Gorin, Yoshihisa Iwashita, Masaki Kobayashi, A. Penzo, M. Plo, A. Dudarev, Y. Yoshimura, M. Gugiu, A. Sidorov, Masami Chiba, V. Yazkov, L. Afanasyev, M. Pentia, V. Brekhovskikh, K. Okada, Fujio Takeutchi, Tomáš Čechák, G.F. Rappazzo, D. Dumitriu, L. Kruglova, Tomáš Trojek, M. Nikitin, J. Saborido, A. Benelli, V. Karpukhin, J. Kluson, J. Martincik, M. Hansroul, O.E. Gorchakov, Z. Hons, A.V. Kuptsov, A. Ryazantsev, D. Drijard, Armando Lanaro, V. Kruglov, A. I. Kulikov, J. Smolik, T. Urban, V. Olchevskii |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Physical Review D. 96 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.96.052002 |
| Popis: | After having announced the statistically significant observation ($5.6\ensuremath{\sigma}$) of the new exotic $\ensuremath{\pi}K$ atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full $\ensuremath{\pi}K$ data sample: $\ensuremath{\tau}=(5.{5}_{\ensuremath{-}2.8}^{+5.0})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}\text{ }\text{ }\mathrm{s}$. By means of a precise relation ($\ensuremath{\approx}1%$) between atom lifetime and scattering length, the following value for the $S$-wave isospin-odd $\ensuremath{\pi}K$ scattering length ${a}_{0}^{\ensuremath{-}}=\frac{1}{3}({a}_{1/2}\ensuremath{-}{a}_{3/2})$ has been derived: $|{a}_{0}^{\ensuremath{-}}|=(0.07{2}_{\ensuremath{-}0.020}^{+0.031}){M}_{\ensuremath{\pi}}^{\ensuremath{-}1}$. |
| Databáze: | OpenAIRE |
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