Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Atoms

Adeva, B.; Kruglova, L.; Vidal, A. Romero; Mariñas, C.; Kobayashi, M.; Amsler, C.; Pló, M.; Tauscher, L.; Penzo, A.; Hons, Z.; Drijard, D.; Trojek, T.; Gorin, A.; Brekhovskikh, V.; Trusov, S.; Iwashita, Yoshihisa; Horikawa, S.; Aogaki, S.; Sidorov, A.; Kluson, J.; Gritsay, K.; Ryazantsev, A.; Yoshimura, Y.; Pentia, M.; Allkofer, Y.; Okada, K.; Gugiu, M.; Rykalin, V.I.; Čechák, T.; Chliapnikov, P.; Takéutchi, F.; Dumitriu, D.; Rappazzo, G. F.; Vrba, T.; Smolík, J.; Nikitin, M.; Hansroul, M.; Lanaro, A.; Yazkov, V.; Lamberto, A.; Gorchakov, O.E.; Flueraşu, D.; Benelli, A.; Anania, A.; Lednický, R.; Guaraldo, C.; Kulish, E.; Dudarev, A.; Karpukhin, V.V.; Zhabitsky, M.; Saborido, J.; Kuptsov, A.V.; Afanasyev, L.; Doskarova, P.; Zrelov, P.; Martincik, J.; Olchevskii, V.; Chiba, M.; Kulikov, A.; Urban, T.; Průša, P.; Kruglov, V.V.

doi:10.1103/physrevlett.117.112001

Cited by 16 publications

(18 citation statements)

References 25 publications

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“…Finally, apart from study of the resonances, the Kπ s-wave scattering lengths are of phenomenological interest as a precision Standard Model test. The DIRAC experiment at CERN has produced promising results for these quantities using πK 'atoms' and plans to achieve 5% accuracy [13]. The I = 1/2, s-wave scattering length calculated in this work is therefore an important step toward an accurate and precise determination of these scattering lengths using lattice QCD.…”

Section: Introductionmentioning

confidence: 89%

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

et al. 2018

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The elastic I = 1/2, s-and p-wave kaon-pion scattering amplitudes are calculated using a single ensemble of anisotropic lattice QCD gauge field configurations with N f = 2 + 1 flavors of dynamical Wilson-clover fermions at m π = 230MeV. A large spatial extent of L = 3.7fm enables a good energy resolution while partial wave mixing due to the reduced symmetries of the finite volume is treated explicitly. The p-wave amplitude is well described by a Breit-Wigner shape with parameters m K * /m π = 3.808(18) and g BW K * Kπ = 5. 33(20) which are insensitive to the inclusion of d-wave mixing and variation of the s-wave parametrization. An effective range description of the near-threshold s-wave amplitude yields m π a 0 = −0.353(25).

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Section: Introductionmentioning

confidence: 89%

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

et al. 2018

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confidence: 93%

“…could be achieved for the first time with a significance of more than 5 standard deviations [1]. On the basis of the same data sample, this paper presents the resulting πK atom lifetime and the corresponding πK scattering length.…”

mentioning

confidence: 93%

“…A dispersion analysis of πK scattering, using Roy-Steiner equations and experimental data in the GeV range, yields M π (a 1/2 − a 3/2 ) = 0.269 ± 0.015 [7], with M π as charged pion mass. Inserting a − 0 = (0.090 ± 0.005) M −1 π and δ K = 0.040 ± 0.022 [6] in (1), one predicts for the πK atom lifetime in the ground state τ = (3.5 ± 0.4) · 10 −15 s.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the πK atom lifetime and the πK scattering length

Adeva¹,

Afanasyev²,

Allkofer³

et al. 2017

Phys. Rev. D

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could be achieved for the first time with a significance of more than 5 standard deviations [1]. On the basis of the same data sample, this paper presents the resulting πK atom lifetime and the corresponding πK scattering length.Using non-perturbative lattice QCD (LQCD), chiral perturbation theory (ChPT) and dispersive analysis, the S-wave ππ and πK scattering lengths were calculated. Swave ππ scattering lengths as described in QCD exploiting chiral SU (2) L ×SU (2) R symmetry breaking were confirmed experimentally at a level of about 4% [2-4]. These measurements -independently of their accuracy -cannot test QCD predictions in the strange sector based on chiral SU (3) L × SU (3) R symmetry breaking. However, this arXiv:1707.02184v2 [hep-ex]

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“…The DIRAC collaboration aims to check low-energy QCD predictions using double-exotic π + π − and π ± K ∓ atoms, which have been observed and studied [1][2][3][4][5][6][7]. In strong inclusive pro-…”

Section: Introductionmentioning

confidence: 99%

First Measurement of a Long-Lived π+π− Atom Lifetime

Adeva¹,

Afanasyev²,

Anania³

et al. 2019

Phys. Rev. Lett.

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The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogen-like π + π − atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96 mm and got broken up in the 2.1 µm thick platinum foil. Analysing the observed number of atomic pairs, n L A = 436 +157 −61 tot , the lifetime of the 2p state is found to be τ 2p = ( 0.45 +1.08 −0.30 tot ) · 10 −11 s, not contradicting the corresponding QED 2p state lifetime τ QED 2p = 1.17 · 10 −11 s. This lifetime value is three orders of magnitude larger than our previously measured value of the π + π − atom ground state lifetime τ = ( 3.15 +0.28 −0.26 tot ) · 10 −15 s. Further studies of long-lived π + π − atoms will allow to measure energy differences between p and s atomic states and so to determine ππ scattering lengths with the aim to check QCD predictions. (J.Schacher) 1 deceased cesses, these atoms are produced in s states distributed according to n −3 , n being the principal quantum number [8].The decay probability of short-lived π + π − atoms (A 2π , pionium) in s states is dominated (99.6%) by the annihilation process [9-13] π + + π − → π 0 + π 0 and is given by the ππ s-wave scattering lengths combination |a 0 − a 2 | (a I is the ππ scattering length for isospin I):

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Observation ofπ−K+andπ+K−Atoms

Cited by 16 publications

References 25 publications

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

Measurement of the πK atom lifetime and the πK scattering length

First Measurement of a Long-Lived π+π− Atom Lifetime

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Observation ofπ−K+andπ+K−Atoms

Cited by 16 publications

References 25 publications

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

Measurement of the πK atom lifetime and the πK scattering length

First Measurement of a Long-Lived π+π− Atom Lifetime

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Product

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Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD

Determination of s- and p-wave I = 1/2 Kπ scattering amplitudes in Nf = 2 + 1 lattice QCD