Coherent production of K∗+ (890) on nuclei and determination of an upper limit for the radiative decay width

Bemporad, C.; Beusch, W.; Dufey, J.P.; Polgar, E.; Websdale, D.; Wilson, J.; Zaimidoroga, O.; Freudenreich, K.; Frosch, R.; Gentit, F.X.; Mühlemann, P.; Astbury, P.; Codling, J.; Lee, J.G.; Letheren, M.

doi:10.1016/0550-3213(73)90496-3

Cited by 33 publications

(3 citation statements)

References 19 publications

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“…a e-mail: dax@hiskp.uni-bonn.de b e-mail: stamen@hiskp.uni-bonn.de (corresponding author) c e-mail: kubis@hiskp.uni-bonn. de The generalization of such Primakoff reactions to beams of charged kaons was conceived as early as in the 1960s [13], and put into practice in the 1970s both at the CERN Proton Synchrotron [14] and at AGS in Brookhaven [15], with refined experiments conducted in the 1980s at Fermilab [16][17][18][19]. The motivation here was mainly the exploration of radiative couplings of strange resonances, predominantly the K * (892), and the supposed relation of these (magnetic) radiative transitions, in the quark model, to quark magnetic moments [16,18].…”

Section: Introductionmentioning

confidence: 99%

Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

Dax¹,

Stamen²,

Kubis³

2021

Eur. Phys. J. C

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We provide a dispersion-theoretical representation of the reaction amplitudes $$\gamma K\rightarrow K \pi $$ γ K → K π in all charge channels, based on modern pion–kaon P-wave phase shift input. Crossed-channel singularities are fixed from phenomenology as far as possible. We demonstrate how the subtraction constants can be matched to a low-energy theorem and radiative couplings of the $$K^*(892)$$ K ∗ ( 892 ) resonances, thereby providing a model-independent framework for future analyses of high-precision kaon Primakoff data.

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Section: Introductionmentioning

confidence: 99%

Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

Dax¹,

Stamen²,

Kubis³

2021

Eur. Phys. J. C

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show abstract

“…The generalization of such Primakoff reactions to beams of charged kaons was conceived as early as in the 1960s [13], and put into practice in the 1970s both at the CERN Proton Synchrotron [14] and at AGS in Brookhaven [15], with refined experiments conducted in the 1980s at Fermilab [16][17][18][19]. The motivation here was mainly the exploration of radiative couplings of strange resonances, predominantly the K * (892), and the supposed relation of these (magnetic) radiative transitions, in the quark model, to quark magnetic moments [16,18].…”

mentioning

confidence: 99%

Dispersive analysis of the Primakoff reaction $γK \to K π$

Dax,

Stamen,

Kubis

2020

Preprint

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We provide a dispersion-theoretical representation of the reaction amplitudes γK → Kπ in all charge channels, based on modern pion-kaon Pwave phase shift input. Crossed-channel singularities are fixed from phenomenology as far as possible. We demonstrate how the subtraction constants can be matched to a low-energy theorem and radiative couplings of the K * (892) resonances, thereby providing a model-independent framework for future analyses of high-precision kaon Primakoff data. IntroductionThe Wess-Zumino-Witten anomaly [1,2] provides QCD predictions for processes of odd intrinsic parity at low energies. The textbook example is the two-photon decay of the neutral pion [3-5], which is determined, at zero quark masses, by the elementary charge, e, and the pion decay constant, F π . The next-more-complicated reactions involving strong and electromagnetic interactions only are three-pseudoscalars-photon processes [6] such as γπ → ππ, or η → ππγ. Low-energy theorems for these are of a very similar structure, i.e., they provide parameter-free predictions in terms of e and F π , e.g.for γπ → ππ [7][8][9]. This reaction can be investigated experimentally in a Primakoff reaction [10], with a charged-pion beam scattered off the Coulomb field of a heavy nucleus. Such experiments have been performed, with the objective to test the prediction of Eq.

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“…Nevertheless, there are experiments at high energies where it seems to have been ignored [5,6], but it is not clear how that omission affects the radiative-decay rates extracted. On the other hand, there are also experiments both at high [7] and low energies [8] where coherent-nuclear production and Coulomb-scattering effects, including the extension of the nuclear-charge distribution,…”

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confidence: 99%

Remark on the Primakoff effect

Fäldt

2010

Phys. Rev. C

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The coherent-nuclear reaction a + A → a ⋆ + A is in the small-angle region dominated by the onephoton-exchange mechanism, often referred to as the Primakoff effect. In this region information about the electromagnetic decay a ⋆ → a + γ can be obtained. Well-known examples are the twophoton decays of the pi-and eta-mesons. Also decays of charged hadrons can be studied. For charged hadrons the one-photon-exchange amplitude comes with a Coulomb-phase factor and a Coulomb-form factor, which depend on the ratio between transverse-and logitudinal-momentum transfers, the latter being fixed. At the peak of the cross-section distribution, where the two momentum transfers are equal, the form factor could cut down the cross-section value by as much as 40%. Consequently, a determination of a radiative-decay rate that relies on the peak value becomes sensitive to a proper treatment of the Coulomb-form factor.

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Coherent production of K∗+ (890) on nuclei and determination of an upper limit for the radiative decay width

Cited by 33 publications

References 19 publications

Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

Dispersive analysis of the Primakoff reaction $$\gamma K \rightarrow K \pi $$

Dispersive analysis of the Primakoff reaction $γK \to K π$

Remark on the Primakoff effect

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