Spin-rotation measurements in π−p → K0Λ

Bell, K. W.; Blissett, J.A.; Broome, T.A.; Daley, H.M.; Hart, J. C.; Lintern, A.L.; Maybury, Robert H.; Parham, A.G.; Payne, B.T.; Saxon, D. H.; Walker, T.G.; Whittaker, J. B.

doi:10.1016/0550-3213(83)90541-2

Cited by 36 publications

(42 citation statements)

References 16 publications

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“…The open circles denote the data from [23], the full circles show the mirror points (due to the 2π ambiguity of β), and the curves represent our fit BG2010-02.…”

Section: The Pwa Methodsmentioning

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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“…The open circles denote the data from [23], the full circles show the mirror points (due to the 2π ambiguity of β), and the curves represent our fit BG2010-02.…”

Section: The Pwa Methodsmentioning

confidence: 99%

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

et al. 2011

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“…In each 2068 ± 15 20 18 -11 5,6 case the available data were analyzed in c.m. energy bins of width 30 MeV.…”

Section: Formalism and Fitting Proceduresmentioning

confidence: 99%

Partial-wave analysis of theπ−p→ηnand
Shrestha
¹
,
Manley
²

2012
Phys. Rev. C

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We investigate the hadronic reactions πN → ηN and πN → KΛ via single-energy partial-wave analyses in the c.m. energy range 1080 to 2100 MeV. Our results for the KΛ channel are consistent with prior works; however, for the ηN channel our results differ significantly from previous energydependent partial-wave analyses that violate the S-matrix unitarity. We present the first (new) results of ηN and KΛ partial-wave amplitudes constrained by a unitary energy-dependent model. We obtain excellent predictions of integrated cross sections for the two reactions from a global energy-dependent solution. Our results imply that the region just above S11(1535) has a major contribution from P11(1710) for π − p → ηn, whereas the large peak near 1700 MeV in π − p → K 0 Λ is dominated by contributions from both S11(1650) and P11(1710).

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“…We anticipate the need of higher partial waves with L > 2. [9], RAL80 [10], and RAL83 [11]. Note that β is 360-degree cyclic which leads to additional data points shown by empty circles.…”

Section: Solution With Sp and D Wavesmentioning

confidence: 99%

“…In the region 1840 − 2270 MeV region, a complete experiment has been performed; differential cross section dσ/dΩ, Λ polarization P , and spin-rotation angle β were measured [9,10,11]. From these data we select 7 bins of 10 − 20 MeV width which have all three experimental observables.…”

Section: Energy Independent Pwa In the 1840 − 2270 Mev Regionmentioning

confidence: 99%

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Study of ambiguities in π−p → ΛK0 scattering amplitudes

et al. 2013

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Abstract. Amplitudes for the reaction π − p → ΛK 0 are reconstructed from data on the differential cross section dσ/dΩ, the recoil polarization P , and on the spin rotation parameter β. At low energies, no data on β exist, resulting in ambiguities. An approximation using S and P waves leads only to a fair description of the data on dσ/dΩ and P ; in this case, there are two sets of amplitudes. Including D waves, the data on dσ/dΩ and P are well reproduced by the fit but now, there are several distinct solutions which describe the data with identical precision. In the range where the spin rotation parameter β was measured, a full and unambiguous reconstruction of the partial wave amplitudes is possible. The energy-independent (single-energy) amplitudes are compared to the energy dependent amplitudes which resulted from a coupled channel fit (BnGa2011-02) to a large data set including both pion and photo-induced reactions. Significant deviations are observed. Consistency between energy dependent and energy independent solutions is obtained by choosing the energy independent solution which is closest to the energy dependent solution. In a second step, the known energy dependent solution for low (or high) partial waves is imposed and only the high (or low) partial waves are fitted leading to smaller uncertainties.

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Spin-rotation measurements in π−p → K0Λ

Cited by 36 publications

References 16 publications

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

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

Partial-wave analysis of theπ−p→ηnand
Shrestha
¹
,
Manley
²

2012
Phys. Rev. C

Study of ambiguities in π−p → ΛK0 scattering amplitudes

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Spin-rotation measurements in π−p → K0Λ

Cited by 36 publications

References 16 publications

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

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

Partial-wave analysis of theπ−p→ηnandShrestha1, Manley2 2012Phys. Rev. C

Study of ambiguities in π−p → ΛK0 scattering amplitudes

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Product

Resources

About

Partial-wave analysis of theπ−p→ηnand
Shrestha
¹
,
Manley
²

2012
Phys. Rev. C