First $\pi K$ atom lifetime and $\pi K$ scattering length measurements

Adeva, B.; Kruglova, L.; Marinas, C.; Ponta, T.; Kobayashi, M.; Romero Vidal, A.; Amsler, C.; Sugimoto, S.; Plo, M.; Penzo, A.; Hons, Z.; Drijard, D.; Trojek, T.; Ciocarlan, C.; Gorin, A.; Brekhovskikh, V.; Trusov, S.; Iwashita, Y.; Horikawa, S.; Aogaki, S.; Schacher, J.; Sidorov, A.; Kluson, J.; Gritsay, K.; Ryazantsev, A.; Yoshimura, Y.; Pentia, M.; Allkofer, Y.; Okada, K.; Gugiu, M.; Rykalin, V.; Cechak, T.; Chliapnikov, P.; Tauscher, L.; 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.; Takeutchi, F.; Kuptsov, A.; Prusa, P.; Afanasyev, L.; Doskarova, P.; Zrelov, P.; Martincik, J.; Olchevskii, V.; Chiba, M.; Duma, M.; Kulikov, A.; Urban, T.; Constantinescu, S.; Kruglov, V.

doi:10.1016/j.physletb.2014.06.043

Article
Report number	arXiv:1403.0845 ; CERN-PH-EP-2014-030 ; DIRAC-PUB-2014-01 ; CERN-PH-EP-2014-030
Title	First $\pi K$ atom lifetime and $\pi K$ scattering length measurements
Related title	First πK atom lifetime and πK scattering length measurements
Author(s)	Adeva, B. (Santiago de Compostela U.) ; Afanasyev, L. (Dubna, JINR) ; Allkofer, Y. (Zurich U.) ; Amsler, C. (Bern U., LHEP) ; Anania, A. (INFN, Trieste ; Messina U.) ; Aogaki, S. (Bucharest, IFIN-HH) ; Benelli, A. (Dubna, JINR) ; Brekhovskikh, V. (Serpukhov, IHEP) ; Cechak, T. (Prague, Tech. U.) ; Chiba, M. (Tokyo Metropolitan U.) ; Chliapnikov, P. (Serpukhov, IHEP) ; Ciocarlan, C. (Bucharest, IFIN-HH) ; Constantinescu, S. (Bucharest, IFIN-HH) ; Doskarova, P. (Prague, Tech. U.) ; Drijard, D. (CERN) ; Dudarev, A. (Dubna, JINR) ; Duma, M. (Bucharest, IFIN-HH) ; 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, Trieste ; Messina U.) ; Lanaro, A. (Wisconsin U., Madison) ; Lednicky, R. (Prague, Inst. Phys.) ; Marinas, C. (Santiago de Compostela U.) ; Martincik, J. (Prague, Tech. U.) ; Nemenov, L. (Dubna, JINR ; CERN) ; 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.) ; Ponta, T. (Bucharest, IFIN-HH) ; Prusa, P. (Prague, Tech. U.) ; Rappazzo, G. (INFN, Trieste ; Messina U.) ; Romero Vidal, A. (Frascati) ; Ryazantsev, A. (Serpukhov, IHEP) ; Rykalin, V. (Serpukhov, IHEP) ; Schacher, J. (Bern U., LHEP) ; Sidorov, A. (Serpukhov, IHEP) ; Smolik, J. (Prague, Tech. U.) ; Sugimoto, S. (KEK, Tsukuba) ; 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	2014-07-30
Imprint	17 Feb 2014
Number of pages	7
Note	14 pages, 8 figures
In:	Phys. Lett. B 735 (2014) 288-294
DOI	10.1016/j.physletb.2014.06.043
Subject category	Particle Physics - Experiment ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN PS ; DIRAC PS212
Free keywords	QCD ; lifetime ; experimental results ; scattering length
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 $I$).
Copyright/License	preprint: © 2014-2024 CERN (Licenses: CC-BY-3.0, arXiv nonexclusive-distrib. 1.0) publication: © 2014-2024 The Author(s) (License: CC-BY-3.0), sponsored by SCOAP³

$Inclusive $\pi K$ production in 24~GeV/c p-Ni interaction: p + Ni $\to$ $\pi^{\mp} K^{\pm}$ + X. The ionisation or breakup of $\pi K$ atoms, $A_{K \pi}$, leads to so-called atomic pairs. (More details, see text)$ $Probability of $\pi K$~atom breakup as a function of ground state lifetime $\tau$ in Ni targets of thicknesses $98\:\mu$m (Ni-1: dashed red) and $108\:\mu$m (Ni-2: solid blue). The predicted lifetime $\tau = 3.5\cdot10^{-15}$~s~(Eq.~\ref{eq:julia1}) corresponds to the breakup probability $P_{\text{br}}$ = 0.28.$ Show more plots

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