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

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

doi:10.1103/PhysRevD.96.052002

If you experience any problem watching the video, click the download button below

Article
Report number	arXiv:1707.02184 ; CERN-EP-2017-137 ; DIRAC-PUB-2017-01
Title	Measurement of the $\pi K$ atom lifetime and the $\pi K$ scattering length
Author(s)	Adeva, B. (Santiago de Compostela U.) ; Afanasyev, L. (Dubna, JINR) ; Allkofer, Y. (Zurich U.) ; Amsler, C. (Zurich U.) ; Anania, A. (INFN, Trieste ; Messina U.) ; Aogaki, S. (Bucharest, IFIN-HH) ; Benelli, A. (Prague, Tech. U.) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U.) ; Chliapnikov, P. (Serpukhov, IHEP) ; Drijard, D. (CERN) ; Dudarev, A. (Dubna, JINR) ; Dumitriu, D. (Bucharest, IFIN-HH) ; Federicova, P. (Prague, Tech. U.) ; Fluerasu, D. (Bucharest, IFIN-HH) ; Gorin, A. (Serpukhov, IHEP) ; Gorchakov, O. (Dubna, JINR) ; Gritsay, K. (Dubna, JINR) ; Guaraldo, C. (Frascati) ; Gugiu, M. (Bucharest, IFIN-HH) ; Hansroul, M. (CERN) ; Hons, Z. (Rez, Nucl. Phys. Inst.) ; Horikawa, S. (Zurich, ETH) ; Iwashita, Y. (Kyoto U.) ; Karpukhin, V. (Dubna, JINR) ; Kluson, J. (Masaryk U., Brno) ; Kobayashi, M. (Kamioka Observ.) ; Kruglov, V. (Dubna, JINR) ; Kruglova, L. (Dubna, JINR) ; Kulikov, A. (Dubna, JINR) ; Kulish, E. (Dubna, JINR) ; Kuptsov, A. (Dubna, JINR) ; Lamberto, A. (INFN, Trieste ; Messina U.) ; Lanaro, A. (Wisconsin U., Madison) ; Lednicky, R. (Prague, Inst. Phys.) ; Marinas, C. (Bonn U.) ; Martincik, J. (Prague, Tech. U.) ; Nemenov, L. (CERN) ; Nikitin, M. (Dubna, JINR) ; Okada, K. (RIKEN BNL) ; Olchevskii, V. (Dubna, JINR) ; Pentia, M. (Bucharest, IFIN-HH) ; Penzo, A. (Iowa U.) ; Plo, M. (Bergen U.) ; Prusa, P. (Prague, Tech. U.) ; Rappazzo, G. (INFN, Messina) ; Romero Vidal, A. (Frascati) ; Ryazantsev, A. (Serpukhov, IHEP) ; Rykalin, V. (Serpukhov, IHEP) ; Saborido, J. (U. Santiago de Compostela (main)) ; Schacher, J. (Bern U.) ; Sidorov, A. (Dubna, JINR) ; Smolik, J. (Prague, Inst. Phys.) ; Takeutchi, F. (Kyoto Sangyo U.) ; Tauscher, L. (Zurich, ETH) ; Trojek, T. (Prague, Tech. U.) ; Trusov, S. (Dubna, JINR) ; Urban, T. (Prague, Tech. U.) ; Vrba, T. (Prague, Tech. U.) ; Yazkov, V. (SINP, Moscow) ; Yoshimura, Y. (KEK, Tsukuba) ; Zhabitsky, M. (Dubna, JINR) ; Zrelov, P. (Dubna, JINR)
Publication	2017-09-19
Imprint	13 Jun 2017
Number of pages	18
Published in:	Phys. Rev. D 96 (2017) 052002
DOI	10.1103/PhysRevD.96.052002
Subject category	Particle Physics - Experiment ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN PS ; DIRAC PS212
Keywords	exotics ; lifetime ; ChPT ; LQCD
Abstract	After having announced the statistically significant observation (5.6 $\sigma$) 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: $\tau = (5.5^{+5.0}_{-2.8}) \cdot 10^{-15}s$. By means of a precise relation ($<1\%$) between atom lifetime and scattering length, the following value for the S-wave isospin-odd $\pi K$ scattering length $a_0^{-} = \frac{1}{3}(a_{1/2}-a_{3/2})$ has been derived: $\left\|a_0^-\right\| = (0.072^{+0.031}_{-0.020}) M_{\pi}^{-1}$.
Other source	Inspire
Copyright/License	Publication: (License: CC-BY-4.0) Preprint: © 2017-2024 CERN (Licenses: CC-BY-4.0, arXiv nonexclusive-distrib. 1.0)
Submitted by	[email protected]

$The dominant decay channel of the $\pi K$ atom. The wavy lines indicate Coulomb photons.$ $Inclusive $\pi K$ production in the 24~GeV$/c$ p-Ni interaction: p + Ni $\to$ $\pi^{\mp} K^{\pm}$ + X;~$A_{K \pi}$ stands for $K^+\pi^-$~atom.$