First πK atom lifetime and πK scattering length measurements

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

doi:10.1016/j.physletb.2014.06.043

Cited by 25 publications

(31 citation statements)

References 28 publications

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“…This better resolution improves the quality of data. Concerning the Ni target, the increase of n A , compared to [10], is caused by optimizing the time-of-flight criteria, which decreases "atomic pair" losses for the same fraction of background in the final distributions. The evaluation of the "atomic pair" number n A is affected by several sources of systematic errors [19,21].…”

Section: Selection πK Eventsmentioning

confidence: 99%

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Observation of π⁻K⁺ and π⁺K⁻ atoms

Yazkov

2018

EPJ Web of Conferences

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Abstract. Experiment DIRAC at CERN PS detects 349 ± 62 pairs from π − K + and π + K − atoms and makes observation of exotic atoms consist of pion and kaon. It allows to measure a difference of S-wave pion-kaon scattering length with isospin 1/2 and 3/2: |a 1/2 0 − a 3/2 0 |. Values of pion-kaon scattering lengths are predicted in a frame of ChPT and LQCD. Therefore investigation of π − K + and π + K − atoms gives possibility to check these predictions for simplest hadronhadron system with s-quark.

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Section: Selection πK Eventsmentioning

confidence: 99%

“…The only experimental pionkaon scattering length measurement has been done with estimation of πK atom lifetime, using data collected in 2008-2010 with Nickel (Ni) target [10]:…”

Section: Introductionmentioning

confidence: 99%

Observation of π⁻K⁺ and π⁺K⁻ atoms

Yazkov

2018

EPJ Web of Conferences

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“…This better resolution improves the quality of data. Concerning the Ni target, the increase of n A , compared to [11], is caused by optimizing the time-of-flight criteria, which decreases "atomic pair" losses for the same fraction of background in the final distributions. The evaluation of the "atomic pair" number n A is affected by several sources of systematic errors [19,21].…”

Section: Selection πK Eventsmentioning

confidence: 99%

“…The only experimental pion-kaon scattering length measurement has been done with estimation of πK atom lifetime, using data collected in 2008-2010 with Nickel (Ni) target [11]:…”

Section: Introductionmentioning

confidence: 99%

Observation and investigation ofπKatoms

Yazkov

2017

EPJ Web Conf.

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Abstract. There is accurate relation between lifetime of atoms, consisting of pion and kaon, and a difference of S-wave pion kaon scattering length with isospin 1/2 and 3/2: |a 1/2 − a 3/2 |. This difference is predicted by low energy QCD. Experiment DIRAC at CERN PS detects 349 ± 62 pairs from K + π − and π + K − atoms and make observation of exotic atoms consist of pion and kaons and provides way for measurement of pion-kaon scattering length difference and check of theoretical predictions.

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“…3. Observation of π ± K ∓ atoms π ± K ∓ atoms were detected in measurements with three targets: a platinum foil of 25.7 µm thick and a nickel foil of 98 or 108 µm for different run periods [11][12][13]. Figures 3 present experimental data on observation of πK atomic pairs of both sign for 1-dimensional analysis over Q.…”

Section: Study Of π + π − Atomsmentioning

confidence: 99%

Study of Hadronic Hydrogen-like Atoms in the DIRAC Experiment at PS CERN

Afanasyev¹

2017

Acta Phys. Pol. B

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Production of hadronic hydrogen-like atoms at high-energy collisions and method of their observation are considered. Main results of the DIRAC experiment on observation and lifetime measurement of atoms formed by pairs of charged pion-pion and pion-kaon are presented. Physics of hadronic hydrogen-like atomsThe DIRAC experiment aims to observe and study hydrogen-like atoms formed by pairs of π + π − (A 2π ) and π ± K ∓ (A πK ) mesons using the 24 GeV extracted beam of PS CERN. The lifetime of these atoms is dictated by the strong interaction between the components. Thus combining hadrons into a hydrogen-like atom opens a unique possibility to study a property of the strong interaction at the very low relative momenta which are of the order of the atom Bohr momentum. For π + π − atom it is 0.5 MeV, for πK -0.8 MeV. Hence, the region of QCD confinement becomes available for investigation.The ground-state lifetime of π + π − atom τ 2π is governed by the ππ S-wave scattering lengths a I , with isospin I = 0, 2 [1-3]: 1/τ 2π ∝ |a 0 − a 2 | 2 . For the πK atom, the lifetime τ πK depends on the πK S-wave scattering lengths with isospin 1/2 and 3/2 [4]: 1/τ πK ∝ |a 1/2 − a 3/2 | 2 . The values of these scattering lengths can be rigorously calculated in the Chiral Perturbation Theory (ChPT) [5,6]. Last results of Lattice QCD [7] confirm this calculation. Thus, the measurement of the hadronic hydrogen-like atom lifetimes provides an experimental test of the low-energy QCD predictions.

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First πK atom lifetime and πK scattering length measurements

Cited by 25 publications

References 28 publications

Observation of π⁻K⁺ and π⁺K⁻ atoms

Observation of π⁻K⁺ and π⁺K⁻ atoms

Observation and investigation ofπKatoms

Study of Hadronic Hydrogen-like Atoms in the DIRAC Experiment at PS CERN

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First πK atom lifetime and πK scattering length measurements

Cited by 25 publications

References 28 publications

Observation of π−K+ and π+K− atoms

Observation of π−K+ and π+K− atoms

Observation and investigation ofπKatoms

Study of Hadronic Hydrogen-like Atoms in the DIRAC Experiment at PS CERN

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Product

Resources

About

Observation of π⁻K⁺ and π⁺K⁻ atoms

Observation of π⁻K⁺ and π⁺K⁻ atoms