A study of K∗(890) and K∗(1420) production mechanisms in K+p → K+π−Δ++ at 13 GeV/c

doi:10.1016/0550-3213(76)90369-2

Nuclear Physics B

Volume 106, 1976, Pages 61-76

https://doi.org/10.1016/0550-3213(76)90369-2 Get rights and content

Abstract

Amplitudes for K^∗(890) and K^∗(1420) production, and their lower spin background, are determined from an analysis of the Kπ angular distribution observed in K⁺p → K⁺π−Δ⁺⁺ at 13 GeV/c. The exchange mechanisms responsible for K^∗Δ production are studied, and a simple model is introduced which describes all features of the data.

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Dispersive πK→πK and ππ→KK̄ amplitudes from scattering data, threshold parameters, and the lightest strange resonance κ or K<inf>0</inf>∗(700)
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We discuss the simultaneous dispersive analyses of $π K \to π K$ and $π π \to K \bar{K}$ scattering data and the $κ / K_{0}^{*} (700)$ resonance. The unprecedented statistics of present and future hadron experiments, modern lattice QCD calculations, and the wealth of new states and decays require such precise and model-independent analyses to describe final state interactions. We review the existing and often conflicting data and explain in detail the derivation of the relevant dispersion relations, maximizing their applicability range. Next, we review and extend the caveats on some data, showing their inconsistency with dispersion relations. Our main result is the derivation and compilation of precise amplitude parameterizations constrained by several $π K \to π K$ and $π π \to K \bar{K}$ dispersion relations. These constrained parameterizations are easily implementable and provide the rigor and accuracy needed for modern experimental and phenomenological hadron physics. As applications, after reviewing their status and interest, we will provide new precise threshold and subthreshold parameters and review our dispersive determination of the controversial $κ / K_{0}^{*} (700)$ resonance and other light-strange resonances.
A study of K-π+ scattering in the reaction K-p→K-π+n at 11 GeV/c
1988, Nuclear Physics, Section B
Results from a high statistics study of the reaction K⁻p→K⁻π⁺n are presented. These results are based on data obtained with an 11 GeV/c beam using the LASS spectrometer at SLAC. The mass dependence of the spherical harmonic moments provides clear evidence for the production of the complete leading orbitally excited K^∗ series up through J^P = 5⁻. These moments are used to perform an energy independent partial wave analysis of the K⁻π⁺ system from threshold to 2.6 GeV/c² using a t-dependent parametrization of the production amplitudes. The amplitudes corroborate the leading K^∗(892), K₂^∗(1430), K₃^∗(1780), K₄^∗(2060), and K₅^∗(2380) resonances observed directly in the moments, and also provide new evidence for underlying states. The 0⁺ amplitude contains the K₀^∗(1350) and a second 0⁺K^∗(1950) at higher mass. The 1⁻K^∗(1790) seen earlier two and three-body analyses is confirmed, and evidence is provided for suppressed K⁻π⁺ decay mode of a second 1⁻ state, the K^∗(1410), which has been seen in earlier three-body analyses.
Study of the reactions K±p→K<inf>s</inf>0π±p at 30 and 50 GeV/c Description of the apparatus and amplitude analysis of the K<inf>s</inf>0π system
1982, Nuclear Physics, Section B
The reactions K^±p→K_s⁰π^±p are studied at 30 and 50 GeV/c. Data for these reactions were obtained using the Geneva-Lausanne spectrometer whose main characteristics are: (i) large forward acceptance; (ii) high-resolution time-of-flight for recoil proton momentum measurement; (iii) high data-taking rate and on-line pattern recognition.
The K^∗(1⁻), K^∗(2⁺), K^∗(3⁻) and K^∗(4⁺) resonance parameters and production cross sections are determined. The Kπ production amplitudes are calculated both as a function of the Kπ mass and of the momentum transfer. Isoscalar natural parity exchange (NPE) is dominant. The NPE amplitudes are decomposed into pomeron- f-, ω-exchange contributions, and their energy dependence between 10 and 50 GeV/c is shown to be well-described by a Regge pole model based on the f-dominated pomeron hypothesis.
K*0(890) polarization measurements in the hypercharge exchange reaction π-p→K*0(890) Λ0 Σ0 at 10 GeV/c
1980, Nuclear Physics, Section B
Polarization phenomena in hadronic reactions
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Non-diffractive two-body channels in reactions K+p→K0π+p and K+p→K+π-π+p at 32 Gev/c
1979, Nuclear Physics, Section B
We present results on a number of non-diffractive two-body channels contributing to reactions K⁺p→K⁰π⁺p and K⁺p→K⁺π⁻π⁺p. The data come from an exposure of the Mirabelle bubble chamber to an r.f. separated K⁺ beam of 32 GeV/c at the Serpukhov accelerator. Total cross sections are given for the final states $K^{∗+} (890) p, K^{∗+} (1420) p, K^{0} Δ^{++} (1232), K^{∗+} (890) p, Δ^{++} (1232), K^{∗0} (1420) Δ^{++} (1232), K^{∗0} (1780) Δ^{++} (1232) and K^{∗0} (890) Δ^{++} (1950)$ . The differential cross sections are given for all channels with sufficient statistics. The energy dependence of the total and differential cross sections is studied.

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^☆: Work supported by the U.K. Science Research Council and the U.S. Energy Research and Development Administration.

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Nuclear Physics B

Abstract

References (16)

Nucl. Phys.

Nucl. Phys.

Phys. Letters

Nucl. Phys.

Phys. Letters

Phys. Letters

Nucl. Phys.

Phys. Letters

Cited by (16)

Dispersive πK→πK and ππ→KK̄ amplitudes from scattering data, threshold parameters, and the lightest strange resonance κ or K<inf>0</inf><sup>∗</sup>(700)

A study of K<sup>-</sup>π<sup>+</sup> scattering in the reaction K<sup>-</sup>p→K<sup>-</sup>π<sup>+</sup>n at 11 GeV/c

Study of the reactions K<sup>±</sup>p→K<inf>s</inf><sup>0</sup>π<sup>±</sup>p at 30 and 50 GeV/c Description of the apparatus and amplitude analysis of the K<inf>s</inf><sup>0</sup>π system

K<sup>0</sup>(890) polarization measurements in the hypercharge exchange reaction π<sup>-</sup>p→K<sup>0</sup>(890) Λ<sup>0</sup> Σ<sup>0</sup> at 10 GeV/c

Polarization phenomena in hadronic reactions

Non-diffractive two-body channels in reactions K<sup>+</sup>p→K<sup>0</sup>π<sup>+</sup>p and K<sup>+</sup>p→K<sup>+</sup>π<sup>-</sup>π<sup>+</sup>p at 32 Gev/c

A study of K∗(890) and K∗(1420) production mechanisms in K+p → K+π−Δ++ at 13 GeV/c☆

Abstract

Nucl. Phys.

Nucl. Phys.

Phys. Letters

Nucl. Phys.

Phys. Letters

Phys. Letters

Nucl. Phys.

Phys. Letters

A study of K^∗(890) and K^∗(1420) production mechanisms in K⁺p → K⁺π−Δ⁺⁺ at 13 GeV/c☆