Measurement of the spin-rotation parameter, β, in the reaction π+p → K+Σ+ at 1.69 and 1.88 GeV/c

Candlin, D. J.; Lowe, D.C.; Peach, Ken; Brankin, C.; Corbett, I.F.; Fisher, S. M.; Ioannidis, G.S.; Litchfield, P. J.; Mapelli, L.P.; Wright, J.; Green, M.G.; Arık, E.; Hallewell, G. D.; Pollock, B.; Shirani, Afsaneh

doi:10.1016/0550-3213(89)90170-3

Cited by 11 publications

(15 citation statements)

References 8 publications

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“…[104] up to small deviations. In addition, values for the spinrotation parameter β by Candlin et al [106] are available at two energies and included in the fit. During the measurement of the spin-rotation parameter, the polarization was re-measured and consistency with the result of Ref.…”

Section: Reaction πN → ηNmentioning

confidence: 99%

“…The latter absorb other sources of SU(3) breaking that are not systematically addressed as possible in chiral perturbation theory. A resonance analysis of the isospin I = 3/2 sector was performed by fitting simultaneously the elastic πN partial-wave amplitudes of the GWU/SAID analysis [54] and π + p → K + Σ + differential cross sections, polarizations, and spin-rotation data [104][105][106]. To achieve a good description of the K + Σ + data, the inclusion of resonances with total spin up to J = 7/2 turned out to be necessary.…”

Section: Introductionmentioning

confidence: 99%

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Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ

Döring²,

et al. 2013

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Elastic πN scattering and the world data of the family of reactions π − p → ηn, K 0 Λ, K 0 Σ 0 , K + Σ − , and π + p → K + Σ + are described simultaneously in an analytic, unitary, coupled-channel approach. SU(3) flavor symmetry is used to relate both the t-and the u-channel exchanges that drive the meson-baryon interaction in the different channels. Angular distributions, polarizations, and spin-rotation parameters are compared with available experimental data. Partial-wave amplitudes are determined and the resonance content is extracted from the analytic continuation, including resonance positions and branching ratios, and possible sources of uncertainties are discussed. The results provide the final-state interactions for the ongoing analysis of photo-and electroproduction data.

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Section: Reaction πN → ηNmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ

Döring²,

et al. 2013

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“…It describes the high energy π − p → K 0 Σ 0 data with the χ 2 = 0.69. The description of the differential cross section with this solution is shown in The data are from [49]. Full curves: the solution BnGa2013-02 and dashed curves: BnGa2011-02M.…”

Section: Production Of Kς Final Statesmentioning

confidence: 99%

Sign ambiguity in the KΣ channel

Anisovich¹,

Klempt²,

Nikonov³

et al. 2013

Eur. Phys. J. A

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Ambiguities of the signs of N → ΣK coupling constants are studied in a multichannel partial wave analysis of a large body of pion and photo-induced reactions. It is shown that the signs are not free from some ambiguities, and further experimental data are needed. Data on the reactions π + p → Σ + K + and γp → K + Σ 0 define rather well the isospin 3/2 contributions to these channels. However the lack of information on polarization observables for the reactions π − p → Σ 0 K 0 , π − p → Σ − K + and γp → K 0 Σ + does not allow us to fix uniquely the signs of N → ΣK coupling constants. As a consequence, also the contributions of nucleon resonances to these channels remain uncertain.

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“…dσ/dΩ 68 20 1.68 [19] dσ/dΩ 84 30 2.50 [24] dσ/dΩ 609 35 1.27 [24] P 304 30 1.58 [25] β 7 1000 1.97 [26] dσ/dΩ 259 30 0.77 [26] P 90 30 1.36 In the list of πN elastic scattering waves (Table 1), we included the waves F 35 and F 37 but not F 15 and F 17 . The lowmass part of the F 15 πN elastic scattering amplitude is easily described by N (1680)F 15 but the contribution of higher mass states to the pion-induced reactions (1a), (1c), and (1d) is small and ambiguous.…”

Section: Datamentioning

confidence: 99%

P -wave excited baryons from pion- and photo-induced hyperon production

et al. 2011

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Abstract. We report evidence for N (1710)P11, N (1875)P11, N (1900)P13, ∆(1600)P33, ∆(1910)P31, and ∆(1920)P33, and find indications that N (1900)P13 might have a companion state at 1970 MeV. The controversial ∆(1750)P31 is not seen. The evidence is derived from a study of data on pion-and photo-induced hyperon production, but other data are included as well. Most of the resonances reported here were found in the Karlsruhe-Helsinki (KH84) [1] and the Carnegie-Mellon (CM) [2] analyses but were challenged recently by the Data Analysis Center at GWU [3]. Our analysis is constrained by the energy independent πN scattering amplitudes from either KH84 or GWU. The two πN amplitudes from KH84 or GWU, respectively, lead to slightly different πN branching ratios of contributing resonances but the debated resonances are required in both series of fits.

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Measurement of the spin-rotation parameter, β, in the reaction π+p → K+Σ+ at 1.69 and 1.88 GeV/c

Cited by 11 publications

References 8 publications

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ

Sign ambiguity in the KΣ channel

P -wave excited baryons from pion- and photo-induced hyperon production

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