Observation of $\pi^- K^+$ and $\pi^+ K^-$ atoms

Adeva, B.; Kruglova, L.; Vidal, A.Romero; Marinas, C.; Kobayashi, M.; 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.; 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.; 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.; Doskarova, P.; Zrelov, P.; Martincik, J.; Olchevskii, V.; Chiba, M.; Kulikov, A.; Urban, T.; Prusa, P.; Kruglov, V.

doi:10.1103/PhysRevLett.117.112001

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Article
Report number	arXiv:1605.06103 ; CERN-EP-2016-128 ; DIRAC-PUB-2016-02
Title	Observation of $\pi^- K^+$ and $\pi^+ K^-$ atoms
Author(s)	Adeva, B. (Santiago de Compostela U.) ; Afanasyev, L. (Dubna, JINR) ; Allkofer, Y. (Zurich U.) ; Amsler, C. (U. Bern, AEC) ; Anania, A. (INFN, Messina) ; Aogaki, S. (Bucharest, IFIN-HH) ; Benelli, A. (Prague, Tech. U.) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U., Math. Dept.) ; Chliapnikov, P. (Serpukhov, IHEP) ; Doskarova, P. (Prague, Tech. U.) ; Drijard, D. (CERN) ; Dudarev, A. (Dubna, JINR) ; Dumitriu, D. (Bucharest, IFIN-HH) ; 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 U.) ; Iwashita, Y. (Kyoto U.) ; Karpukhin, V. (Dubna, JINR) ; Kluson, J. (Prague, Tech. U.) ; Kobayashi, M. (KEK, Tsukuba) ; Kruglov, V. (Dubna, JINR) ; Kruglova, L. (Dubna, JINR) ; Kulikov, A. (Dubna, JINR) ; Kulish, E. (Dubna, JINR) ; Kuptsov, A. (Dubna, JINR) ; Lamberto, A. (INFN, Messina) ; Lanaro, A. (Wisconsin U., Madison) ; Lednicky, R. (Prague, Inst. Phys.) ; Marinas, C. (Santiago de Compostela U.) ; Martincik, J. (Prague, Tech. U.) ; Nikitin, M. (Dubna, JINR) ; Okada, K. (Kyoto Sangyo U.) ; Olchevskii, V. (Dubna, JINR) ; Pentia, M. (Bucharest, IFIN-HH) ; Penzo, A. (INFN, Trieste) ; Plo, M. (Santiago de Compostela U.) ; Prusa, P. (Prague, Tech. U.) ; Rappazzo, G. (INFN, Messina) ; Vidal, A.Romero (Frascati) ; Ryazantsev, A. (Serpukhov, IHEP) ; Rykalin, V. (Serpukhov, IHEP) ; Saborido, J. (Santiago de Compostela U.) ; Sidorov, A. (Serpukhov, IHEP) ; Smolik, J. (Prague, Tech. U.) ; Takeutchi, F. (Kyoto Sangyo U.) ; Tauscher, L. (Basel U.) ; Trojek, T. (Prague, Tech. U.) ; Trusov, S. (SINP, Moscow) ; 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	2016-09-08
Imprint	29 Apr 2016
Number of pages	6
Published in:	Phys. Rev. Lett. 117 (2016) 112001
DOI	10.1103/PhysRevLett.117.112001
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN PS ; DIRAC PS212
Keywords	exotics ; experimental results ; strange dimesonic atom
Abstract	The observation of hydrogen-like $\pi K$ atoms, consisting of $\pi^- K^+$ or $\pi^+ K^-$ mesons, is presented. The atoms have been produced by 24 GeV/$c$ protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionisation) of $\pi K$ atoms in the same targets yields characteristic $\pi K$ pairs, called ``atomic pairs'', with small relative momenta in the pair centre-of-mass system. The upgraded DIRAC experiment has observed $349\pm62$ such atomic $\pi K$ pairs, corresponding to a signal of 5.6 standard deviations.
Other source	Inspire
Copyright/License	preprint: © 2016-2024 CERN (Licenses: CC-BY-4.0, arXiv nonexclusive-distrib.1.0) publication: © 2016-2024 CERN (License: CC-BY-3.0)
Submitted by	[email protected]

$Inclusive $\pi K$ production in 24~GeV/c p-Ni interaction: p + Ni $\to$ $\pi^- K^+$ + X. The ionisation or breakup of $A_{K \pi}$ leads to so-called atomic pairs. (More details, see text in section~\ref{boundfree}.)$

$\footnotesize $Q_L$ distributions of potential $\pi^-K^+$ pairs before (a) and after (b) applying the selection described in the text. Events with positive $Q_L$ are suppressed compared to those with negative $Q_L$ due to lower acceptance and lower production cross-section.$ Show more plots

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