Measurement of the 
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 atom lifetime and the 
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 scattering length

Adeva, B.; Afanasyev, L.; Allkofer, Y.; Amsler, C.; Anania, A.; Aogaki, S.; Benelli, A.; Brekhovskikh, V.; Čechák, T.; Chiba, M.; Chliapnikov, P.; Drijard, D.; Dudarev, A.; Dumitriu, D.; Federicova, P.; 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.; Průša, P.; Rappazzo, G. F.; Vidal, A. Romero; Ryazantsev, A.; Rykalin, V.I.; Saborido, J.; Schacher, J.; Sidorov, A.; Smolík, J.; Takéutchi, F.; Tauscher, L.; Trojek, T.; Trusov, S.; Urban, T.; Vrba, T.; Yazkov, V.; Yoshimura, Y.; Zhabitsky, M.; Zrelov, P.

doi:10.1103/physrevd.96.052002

Cited by 7 publications

(2 citation statements)

References 54 publications

(96 reference statements)

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“…Experimentally, the combination |a 1/2 − a 3/2 | can be extracted from the lifetime of the short-lived πK atoms A π + K − and A π − K + in the ground state; the relation between the two quantities has a theoretical precision of 1%. Such an extraction has been achieved by the DIRAC experiment at the CERN PS with a proton beam momentum of 24 GeV/c: the DIRAC collaboration observed 349 ± 62 πK atomic pairs after breakup of the produced πK atoms, measured the πK atom lifetime, and extracted |a 1/2 − a 3/2 | with a precision of 34% [106].…”

Section: Dirac++mentioning

confidence: 99%

Physics Beyond Colliders: QCD Working Group Report

Dainese,

Diehl,

Di Nezza

et al. 2019

Preprint

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Section: Dirac++mentioning

confidence: 99%

Physics Beyond Colliders: QCD Working Group Report

Dainese,

Diehl,

Di Nezza

et al. 2019

Preprint

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“…This is particularly interesting, because it opens the possibility of ejecting in the atmosphere not only neutron-rich nuclei, but also more exotic material, such as hyperons. These particles could interact with the surrounding electrons or protons to form atomic structures, with recombination processes at rest similar to those occurring in laboratory with trapped particles [27], or with in flight capture [28].…”

Section: Neutron Star/quark Star Conversion Processmentioning

confidence: 99%

Exotic atoms at extremely high magnetic fields: the case of neutron star atmosphere

Fontana

Colombi

Carretta

et al. 2018

EPJ Web of Conferences

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Abstract. The presence of exotic states of matter in neutron stars (NSs) is currently an open issue in physics. The appearance of muons, kaons, hyperons, and other exotic particles in the inner regions of the NS, favoured by energetic considerations, is considered to be an effective mechanism to soften the equation of state (EoS). In the so-called twofamilies scenario, the softening of the EoS allows for NSs characterized by very small radii, which become unstable and convert into a quark stars (QSs). In the process of conversion of a NS into a QS material can be ablated by neutrinos from the surface of the star. Not only neutron-rich nuclei, but also more exotic material, such as hypernuclei or deconfined quarks, could be ejected into the atmosphere. In the NS atmosphere, atoms like H, He, and C should exist, and attempts to model the NS thermal emission taking into account their presence, with spectra modified by the extreme magnetic fields, have been done. However, exotic atoms, like muonic hydrogen (p µ − ) or the so-called Sigmium (Σ + e − ), could also be present during the conversion process or in its immediate aftermath. At present, analytical expressions of the wave functions and eigenvalues for these atoms have been calculated only for H. In this work, we extend the existing solutions and parametrizations to the exotic atoms (p µ − ) and (Σ + e − ), making some predictions on possible transitions. Their detection in the spectra of NS would provide experimental evidence for the existence of hyperons in the interior of these stars.

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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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Measurement of the πK atom lifetime and the πK scattering length

Cited by 7 publications

References 54 publications

Physics Beyond Colliders: QCD Working Group Report

Physics Beyond Colliders: QCD Working Group Report

Exotic atoms at extremely high magnetic fields: the case of neutron star atmosphere

Observation of π⁻K⁺ and π⁺K⁻ atoms

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Measurement of the πK atom lifetime and the πK scattering length

Cited by 7 publications

References 54 publications

Physics Beyond Colliders: QCD Working Group Report

Physics Beyond Colliders: QCD Working Group Report

Exotic atoms at extremely high magnetic fields: the case of neutron star atmosphere

Observation of π−K+ and π+K− atoms

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Observation of π⁻K⁺ and π⁺K⁻ atoms