Polarization of Σ0 hyperons in inclusive production from 28.5 GeV/c protons on beryllium

Dukes, E. C.; Overseth, O. E.; Bunce, G.; Makdisi, Y. I.; Yamin, P.; Jensen, D.; Kreisler, M. N.; Marcin, Martin; Raychaudhuri, K.; Sullivan, Marilyn W.; Heller, Kenneth; Shupe, M.

doi:10.1016/0370-2693(87)90471-0

Cited by 19 publications

(2 citation statements)

References 22 publications

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“…Today, more than 20 years after these first observations, similar polarisation effects have been observed in a large energy range and for other hyperons of the baryon octet (Σ − [5], Σ 0 [6], Σ + [7], Ξ − [8] and Ξ 0 [9]). The trend of the data can be summarised as…”

Section: Introductionsupporting

confidence: 52%

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

et al. 2002

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The observed polarisation of Λ hyperons from the inclusive pA → ΛX reaction at high energies has previously been well described within the Lund string model through polarised ss quark pair production in the string breaking hadronisation process. This model is here applied to the exclusive pp → ΛΛ reaction at low energies and compared to available data sets down to an incident beam momentum of 1.835 GeV/c. This required an extension of the diquark scattering model to involve three components: an isotropic part relevant close to threshold, a spectator part and a forward scattering part as in pA → ΛX at high energies. The observed angular distributions are then reproduced and, for momentum transfers above |t ′ | = 0.2 GeV 2 , agreement with the measured polarisation is also obtained.

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Section: Introductionsupporting

confidence: 52%

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

et al. 2002

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“…3.3, since Λ hyperons from Σ 0 decay are expected to carry, on average, -1/3 the polarization of the Σ 0 [30]. The latter one is predicted [31,52] and measured [72] to be opposite to that of the Λ.…”

Section: λ Identificationmentioning

confidence: 95%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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Abstract. Results on Λ hyperon production are reported for collisions of p (3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleonnucleon collisions, ycm = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The Λ phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for Λ production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing Λ polarization in the weak decay Λ → pπ − . Finite negative values of the polarization in the order of 5 − 20 % are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for pt > 300 MeV/c and increases with decreasing rapidity for y < 0.8. PACS.25.75.Dw, 25.75.Gz

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Hyperon Polarization at High Energy

Heller

1991

High Energy Spin Physics

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Polarization of Σ0 hyperons in inclusive production from 28.5 GeV/c protons on beryllium

Cited by 19 publications

References 22 publications

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

String model description of polarisation and angular distributions in ¯pp → ¯ΛΛ at low energies

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Hyperon Polarization at High Energy

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