Production and decay of Ξ∗ (1820) in K−p reactions at 4.2 GeV/c

Armenteros, R.; Berge, J. P.; Gavillet, Ph.; Hemingway, R.J.; Blokzijl, R.; Massaro, G.; Voorthuis, H.; Heinen, P.M.; Metzger, W. J.; Schotanus, D. J.; Tiecke, H.; Timmermans, J.J.M.; Walle, R. T. Van de

doi:10.1016/0370-2693(76)90688-2

Cited by 25 publications

(8 citation statements)

References 13 publications

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“…This state was first found inKΛ mass spectrum in Ref. [21], which reported its mass and width values to be M = 2123 ± 7 MeV and Γ = 25 ± 12 MeV. One of the later investigation confirmed an accumulation of events around 2120 MeV inKΛ and determined the mass and width to be M = 2137 ± 4 MeV and Γ ∼ 20 MeV [22].…”

Section: B ξ(2120)mentioning

confidence: 69%

Why Ξ(1690) and Ξ(2120) are so narrow

et al. 2018

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The Ξ baryons are expected to be naturally narrower as compared to their nonstrange and strange counterparts since they have only one light quark and, thus, their decay involves producing either a light meson and doubly strange baryon or both meson and baryon with strangeness which involves, relatively, more energy. In fact, some Ξ's have full widths of the order of even 10-20 MeV when, in principle, they have a large phase space to decay to some open channels. Such is the case of Ξ(1690), for which the width has been found to be of the order of 10 MeV in the latest BABAR and BELLE data. In this manuscript we study why some Ξ's are so narrow. Based on a coupled channel calculation of the pseudoscalar meson-baryon and vector meson-baryon systems with chiral and hidden local symmetry Lagrangians, we find that the answer lies in the intricate hadron dynamics. We find that the known mass, width, spin-parity and branching ratios of Ξ(1690) can be naturally explained in terms of coupled channel meson-baryon dynamics. We find another narrow resonance which can be related to Ξ(2120). We also look for exotic states Ξ + and Ξ −− but find none. In addition we provide the cross sections forKΛ,KΣ → πΞ which can be useful for understanding the enhanced yield of Ξ reported in recent studies of heavy ion collisions.

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Section: B ξ(2120)mentioning

confidence: 69%

Why Ξ(1690) and Ξ(2120) are so narrow

et al. 2018

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“…In the fit, the spinparities of Ξ (1690) − and Ξ(1820) − are assumed to be J P = 1/2 − and J P = 3/2 − based on previous experimental results [7,8], the Ξ * −Ξ+ angular momenta (L (Ξ * −Ξ+ ) ) are set to be 0 for both the Ξ(1690) − and Ξ(1820) − , while the K − Λ angular momenta (L (K − Λ) ) are 0 and 2 respectively. B L (p) is the Blatt-Weisskopf form factor [22]:…”

Section: B Observation Of ξ * − Statesmentioning

confidence: 99%

“…More recently, BABAR reported evidence for J P = 1/2 − for the Ξ(1690) by analyzing the Legendre Polynomial moments of the Ξ − π + system in the decay Λ + c → Ξ − π + K + [7]. Clear evidence for Ξ(1820) was observed in the K − Λ mass spectrum from a sample of 130±16 events in K − p interactions [8], and the J = 1/2 assumption was ruled out by using the Byers and Fenster technique [9]. Ten years later, a CERN-SPS experiment indicated that Ξ(1820) favors negative parity in the case of J = 3/2 [10].…”

Section: Introductionmentioning

confidence: 99%

Measurements ofψ(3686)→K−ΛΞ
Ablikim¹,
Ачасов²,
Ai³
et al. 2015
Phys. Rev. D
16
1
4
0
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“…The experimental data are taken from Ref. [17], which is the only data set available so far for the K − p → K + K − Λ reaction. The experiment was performed using the K − beam at 4.2 GeV/c to study Ξ(1820) and higher resonances.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The green and blue areas indicate the results with and without the φ(1020) contribution, respectively. The experimental data[17] are overlaid as a histogram.…”

mentioning

confidence: 99%

Ξ(1690)⁻ Resonance Production via K⁻p → K⁺K⁻Λ

Nam

Ahn

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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In this talk, we investigate Ξ(1690) − production from the K − p → K + K − Λ reaction wit the effective Lagrangian method and consider the s-and u-channel Σ/Λ ground states and resonances for the Ξ-pole contributions, in addition to the s-channel Λ, u-channel nucleon pole, and t-channel K −exchange for the φ-pole contributions. The Ξ-pole includes Ξ(1320), Ξ(1535), Ξ(1690)(J p = 1/2 − ), and Ξ(1820)(J p = 3/2 − ). We compute the Dalitz plot density of (d 2 σ/dM K + K − dM K − Λ at 4.2 GeV/c) and the total cross sections for the K − p → K + K − Λ. Employing the parameters from the fit, we present the cross sections for the two-body K − p → K + Ξ(1690) − reaction near the threshold. We also demonstrate that the Dalitz plot analysis for p K − = 1.915 ∼ 2.065 GeV/c makes us to explore direct information for Ξ(1690) − production, which can be done by future K − beam experiments.

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Production and decay of Ξ∗ (1820) in K−p reactions at 4.2 GeV/c

Cited by 25 publications

References 13 publications

Why Ξ(1690) and Ξ(2120) are so narrow

Why Ξ(1690) and Ξ(2120) are so narrow

Measurements ofψ(3686)→K−ΛΞ
Ablikim¹,
Ачасов²,
Ai³
et al. 2015
Phys. Rev. D
16
1
4
0
View full text Add to dashboard Cite

Ξ(1690)⁻ Resonance Production via K⁻p → K⁺K⁻Λ

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Production and decay of Ξ∗ (1820) in K−p reactions at 4.2 GeV/c

Cited by 25 publications

References 13 publications

Why Ξ(1690) and Ξ(2120) are so narrow

Why Ξ(1690) and Ξ(2120) are so narrow

Measurements ofψ(3686)→K−ΛΞAblikim1, Ачасов2, Ai3 et al. 2015Phys. Rev. D16140View full textAdd to dashboardCite

Ξ(1690)− Resonance Production via K−p → K+K−Λ

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Measurements ofψ(3686)→K−ΛΞ
Ablikim¹,
Ачасов²,
Ai³
et al. 2015
Phys. Rev. D
16
1
4
0
View full text Add to dashboard Cite

Ξ(1690)⁻ Resonance Production via K⁻p → K⁺K⁻Λ