Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ξ</mml:mi></mml:math>Hyperons

Carmony, D.D.; Pjerrou, G. M.; Schlein, P.; Slater, W.; Stork, D. H.; Ticho, Harold K.

doi:10.1103/physrevlett.12.482

Cited by 66 publications

(15 citation statements)

References 6 publications

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“…The consequences of formal U£(12) invariance have been discussed by several authors. 11 Due to the orthogonality of the spinor wave functions for particle and antiparticle with equal momenta, one finds that Um* A " r (-P)* AB ' C '(P) = 0. p~0 ABC (10) This implies that in the Ujg (12) limit there are no annihilations into two mesons. In our spurion scheme, with S used in first order, we have the unique amplitude…”

Section: -(P')[a(s T T)-iy-ib+k')b(st)]u(/>)mentioning

confidence: 99%

“…The amplitude (9) and the corresponding U£ (12)-invariant expression (7) together give rise to independent complex functions A(s,t) and B{s,t) for Reaction (5), and this makes it possible to account for the observed polarization effects. 10 Finally, we consider the annihilation of nucleon-antinucleon pairs at rest into mesons. The consequences of formal U£(12) invariance have been discussed by several authors.…”

Section: -(P')[a(s T T)-iy-ib+k')b(st)]u(/>)mentioning

confidence: 99%

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Breaking ofUL(12)Symmetry

Oehme

1965

Phys. Rev. Lett.

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Section: -(P')[a(s T T)-iy-ib+k')b(st)]u(/>)mentioning

confidence: 99%

Section: -(P')[a(s T T)-iy-ib+k')b(st)]u(/>)mentioning

confidence: 99%

Breaking ofUL(12)Symmetry

Oehme

1965

Phys. Rev. Lett.

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“…This reaction has been studied experimentally mainly throughout the 60's [28][29][30][31][32][33][34][35][36][37], which was followed by several measurements made in the 70's and 80's [38][39][40][41][42][43][44]. The existing data are rather limited and suffer from large uncertainties.…”

Section: Introductionmentioning

confidence: 99%

K¯+N→K+Ξreaction andS=−1hyperon resonances

Jackson

Haberzettl

et al. 2015

Phys. Rev. C

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TheK+N → K +Ξ reaction is studied for center-of-momentum energies ranging from threshold to 3 GeV in an effective Lagrangian approach that includes the hyperon s-and u-channel contributions as well as a phenomenological contact amplitude. The latter accounts for the rescattering term in the scattering equation and possible short-range dynamics not included explicitly in the model. Existing data are well reproduced and three above-the-threshold resonances were found to be required to describe the data, namely, the Λ(1890), Σ(2030), and Σ(2250). For the latter resonance we have assumed the spin-parity of J P = 5/2 − and a mass of 2265 MeV. The Σ(2030) resonance is crucial in achieving a good reproduction of not only the measured total and differential cross sections, but also the recoil polarization asymmetry. More precise data are required before a more definitive statement can be made about the other two resonances, in particular, about the Σ(2250) resonance that is introduced to describe a small bump structure observed in the total cross section ofThe present analysis also reveals a peculiar behavior of the total cross section data in the threshold energy region in K − + p → K + + Ξ − , where the P -and D-waves dominate instead of the usual S-wave. Predictions for the target-recoil asymmetries of theK + N → K + Ξ reaction are also presented.

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“…The reaction process K − p → KΞ has been studied experimentally, mainly, throughout the 1960's [100][101][102][103][104][105][106][107][108][109], which was followed by several measurements made in the 1970's and 1980's [110][111][112][113][114][115][116]. The existing data (total cross sections, differential cross sections, and recoil polarization asymmetries) are rather limited and suffer from large uncertainties.…”

Section: B Data Selectionmentioning

confidence: 99%

Towards the minimal spectrum of excited baryons

et al. 2019

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In the light baryon sector resonances can be broad and overlapping and are in most cases not directly visible in the cross section data. Automatized model selection techniques that introduce penalties for resonances can be used to determine the minimally needed set of resonances to describe the data. Several possible penalization schemes are compared. As an application we perform a blindfold identification of hyperon resonances in theKN → KΞ reaction based on the Least Absolute Shrinkage and Selection Operator (LASSO) in combination with the Bayesian Information Criterion (BIC). We find ten resonances -out of the 21 above-threshold hyperon resonances with spin J ≤ 7/2 listed by the Particle Data Group. In traditional analyses, it is practically impossible to test the relevance of all resonances and their combinations that may potentially contribute to the reaction. By contrast, the present method proves capable of determining the relevant resonances among a large pool of candidates.

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Properties ofΞHyperons

Abstract: of the plane of polarization. The interaction, which has been observed from currents of a few amperes up to large currents, is also being studied for the onset of the conversion from damped Alfven waves to propagating helicons.

Cited by 66 publications

References 6 publications

Breaking ofUL(12)Symmetry

Breaking ofUL(12)Symmetry

K¯+N→K+Ξreaction andS=−1hyperon resonances

Towards the minimal spectrum of excited baryons

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