Production of electron-positron pairs in a nuclear coulomb field

Kryshkin, V. I.; Sterligov, A. G.; Usov, Yu.P.

doi:10.1007/bf00836699

Cited by 8 publications

(16 citation statements)

References 3 publications

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“…Therefore, based on the original proposal [1] the production reactions off nuclei provide a tool to measure these quantities. This has been followed in [16][17][18][19] where the π 0 → γγ and η → γγ decay widths were measured. Presently a new generation of experiments [20] allows to measure the π 0 → γγ decay width via the Primakoff effect on a few percent level.…”

Section: Introductionmentioning

confidence: 99%

Primakoff production ofπ0,η, andη′in the Coulomb field of a nucleus

Kaskulov

Mosel

2011

Phys. Rev. C

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Photoproduction of neutral pseudoscalar mesons π 0 , η(547) and η ′ (958) in the Coulomb field of an atomic nucleus is studied using a model which describes the Primakoff and nuclear parts of the production amplitude. At high energies the nuclear background is dominated by the exchange of C-parity odd Regge trajectories. In the coherent production the isospin filtering makes the ω(782) a dominant trajectory. The calculations are in agreement with π 0 data from JLAB provided the photon shadowing and final state interactions of mesons are taken into account. The kinematic conditions which allow to study the Primakoff effect in η and η ′ photoproduction off nuclei are further discussed. We also give predictions for the higher energies available at the JLAB upgrade.

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Section: Introductionmentioning

confidence: 99%

Primakoff production ofπ0,η, andη′in the Coulomb field of a nucleus

Kaskulov

Mosel

2011

Phys. Rev. C

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“…The Particle Data Group (PDG) bases its π 0 lifetime average on five measurements. Three are Primakoff experiments (29,30,31), the fourth is a direct measurement of τ π 0 (32), and the fifth is ) θ π (degrees)…”

Section: Previous Measurements Of the Neutral Pion Lifetimementioning

confidence: 99%

“…Measurements and calculations for (π 0 → γ γ ). Previous Primakoff experiments (29,30,31,35) are labeled 1, 2, 3, and 4, respectively. The CERN direct measurement ( 32) is labeled 5.…”

Section: Primakoff Measurementsmentioning

confidence: 99%

Neutral Pion Decay

Miskimen

2011

Annu. Rev. Nucl. Part. Sci.

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The study of π 0 decay has played an important role in the development of particle physics: The π 0 → γ γ decay provides key insights into the anomaly sector of quantum chromodynamics. In this review, the historical progression of π 0 discovery, lifetime measurements, and theory are presented. A new measurement of the π 0 radiative width via the Primakoff effect has been made at JLab. The result, (π 0 → γ γ ) = 7.82 ± 0.14 (stat.) ± 0.17 (syst.) eV, is a factor of 2.1 more precise than the currently accepted value, and it is in agreement with the chiral anomaly prediction and with next-to-leading-order chiral perturbation theory calculations. Primakoff experiments at higher energies to measure the η and η radiative widths are also discussed.

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“…At that time a new experimental prediction from CERN-NA030 [11] suggested a smaller value for the partial width 7.25 ± 0.23 eV (statistical and systematic errors combined in quadrature). Older experiments (Tomsk, Desy and Cornell [12]), seemed not to be so precise (7.23 ± 0.55, 11.7 ± 1.2, 7.92 ± 0.42 eV, respectively); they relied on the so-called Primakoff effect [13] that is based on…”

Section: π 0 → γγmentioning

confidence: 99%

Chiral expansions of pi0 decays

Kampf¹

2009

Proceedings of International Workshop on Effective Field Theories: From the Pion to the Upsilon — PoS(EFT09)

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Production of electron-positron pairs in a nuclear coulomb field

Cited by 8 publications

References 3 publications

Primakoff production ofπ0,η, andη′in the Coulomb field of a nucleus

Primakoff production ofπ0,η, andη′in the Coulomb field of a nucleus

Neutral Pion Decay

Chiral expansions of pi0 decays

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