Experimental study of the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>Λ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>at beam momenta between 930 and 1130 MeV/<i>c</i>

Knasel, T.M.; Lindquist, J.; Nelson, B.; Sumner, R.L.; Swallow, E. C.; Winston, R.; Wolfe, D.; Phillips, Peter R.; Reibel, K.; Schwartz, Matthew D.; Stevens, A.; Romanowski, T. A.; Watson, J.M.

doi:10.1103/physrevd.11.1

Cited by 44 publications

(68 citation statements)

References 40 publications

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“…Here we just emphasize, in Figs [20] and open circles the data from [21,22], the curves represent our fit BG2010-02. …”

Section: The Pwa Methodsmentioning

confidence: 99%

“…The full curve shows the integrated fit of the differential cross section from the solution BG2010-02. The full triangles denote the total cross section calculated from [20] and the open circles from [21], [22]. b) The total cross section for the reaction π + p → K + Σ + and contributions from leading partial waves.…”

Section: Leading Partial Wave Contributionsmentioning

confidence: 99%

“…All curves have a clear minimum in the region 1670-1700 MeV, including the fit to γp → KΛ [112]. To emphasize the need for a forth P 11 resonance we have split the differential cross section on π − p → K 0 Λ into a low energy region (below 1750 MeV) from [20], and the high-energy part (above 1750 MeV) from [21,22]. The low-energy region exhibits a clear minimum at about 1730 MeV; the high-energy part still "sees" the low-mass peak (now at 1650 MeV) but a second minimum in the region 1850-1880 MeV is clearly present.…”

Section: (I)jmentioning

confidence: 99%

“…The dynamical Breit-Wigner parameterization of the πN elastic amplitude can be written as: [112], c) of the differential cross section for the π − p → ηn [18], of the differential cross section for the π − p → KΛ, separated into lowenergy d) [20] and high-energy e) region [21,22]…”

Section: Extraction Of the Breit-wigner Parametersmentioning

confidence: 99%

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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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“…Here we just emphasize, in Figs [20] and open circles the data from [21,22], the curves represent our fit BG2010-02. …”

Section: The Pwa Methodsmentioning

confidence: 99%

Section: Leading Partial Wave Contributionsmentioning

confidence: 99%

Section: (I)jmentioning

confidence: 99%

Section: Extraction Of the Breit-wigner Parametersmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2011

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“…It is expected that, because of strong final-state interaction, the use of an anisotropic angular distribution will not have significant effects on the final kaon momentum spectra. To see more quantitatively the effects of angular distribution, we will take πN → Y K as an example, where limited experimental data are available [75]. In …”

Section: Inclusive Versus Exclusive Cross Sectionsmentioning

confidence: 99%

Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

1997

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The recent past witnesses the growing interdependence between the physics of hadrons, the physics of relativistic heavy-ion collisions, and the physics of compact objects in astrophysics. A notable example is the kaon which plays special roles in all the three fields. In this paper, we first review the various theoretical investigations of kaon properties in nuclear medium, focusing on possible uncertainties in each model. We then present a detailed transport model study of kaon production in heavy-ion collisions at SIS energies. We shall discuss especially the elementary kaon and antikaon production cross sections in hadron-hadron interactions, that represent one of the most serious uncertainties in the transport model study of particle production in heavy-ion collisions. The main purpose of such a study is to constrain kaon in-medium properties from the heavy-ion data. This can provide useful guidances for the development of theoretical models of the kaon in medium. In the last part of the paper, we apply the kaon in-medium properties extracted from heavy-ion data to the study of neutron star properties. Based on a conventional equation of state of nuclear matter that can be considered as one of the best constrained by available experimental data on finite nuclei, we find that the maximum mass of neutron stars is about 2M⊙, which is reduced to about 1.5M⊙ once kaon condensation as constrained by heavy-ion data is introduced.pacs: 25.75. Dw, 97.60.Jd, 26.60.+c, 24.10.Lx

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The role of the Δ (1920) resonance for kaon production in heavy ion collisions

1994

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The long mean free path of K + mesons in nuclear matter makes this particle a suitable messenger for the dynamics of nucleus-nucleus reactions at intermediate energies (100 MeV to 3 GeV per nucleon). A prerequisite for this is the knowledge of the elementary production cross sections πN → ΣK. Here these cross sections are studied for the first time with the explicite inclusion of the rel (1 − ) vector meson exchange is included. It is shown that the total cross sections for different channels of the πN → ΣK reactions, i.e. π + p → Σ + K + , π − p → Σ − K + , π + n → Σ 0 K + (π − p → Σ − K + ) and π 0 p → Σ 0 K + differ not only by absolute values but also by their energy dependence. This shape differences are due to the mixture of the isospin I = 3/2 ∆(1920) with isospin I = 1/2 nucleon resonances. However, this I = 3/2 resonance does not give a contribution to the πN → ΛK reactions. So the shapes of the total cross sections πN → ΛK for different isospin projections are the same. In spite of this, such cross sections averaged over different isospin projections in the same multiplet are often used for studies of kaon production in heavy-ion collisions. Here we give an explicit separate parametrization of the cross sections for each channel πN → ΣK, which are calculated in this work. The total cross section for π − p → Σ − K + which runs through different I = 3/2 and I = 1/2 resonances can be well reproduced by the present model. * Supported by DFG under contract No. Fa 67/14-1 † Supported by GSI under contract No. 06 TÜ 736 0 Because kaons (K + ) have a long mean free path inside the nucleus, one believes that they are good messengers to provide information about the high density and temperature phase of the heavy ion collisions [1,2]. Furthermore, they can be also sensitive probes for the nuclear equation of state (EOS) [3]. For these reasons, many studies of kaon production in heavy ion collisions have been performed both theoretically and experimentally [1]- [13].In most theoretical studies of the kaon production in heavy ion collisions by either the Vlasov-Uehling-Uhlenbeck approach (VUU) [4], or by "quantum" molecular dynamics (QMD) [5,6], however, the kaon elementary production cross sections in free space parametrized by J. Randrup and C. M. Ko [12] for B 1 B 2 → B 3 Y K, and by J. Cugnon and R. M. Lombard [13] for πN → Y K are widely used. Here B stands for either the nucleon or the ∆(1232), Y stands for either the Σ or the Λ, respectively. Although there exists a relatively long history for kaon production studies, not many investigations have been performed for the elementary process [14].On the other hand, due to recent high precision data, we have now rich and accurate informations on the baryon resonances, on quantum numbers, on decay modes, on decay rates and so on [15,16]. Thus, it is now adequate and necessary to incorporate these resonances in calculations of the elementary cross section for kaon production. There are some works which include such baryon resonances in kaon production stu...

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Experimental study of the reactionπ−p→ΛK0at beam momenta between 930 and 1130 MeV/c

Cited by 44 publications

References 40 publications

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

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

Kaons in dense matter, kaon production in heavy-ion collisions, and kaon condensation in neutron stars

The role of the Δ (1920) resonance for kaon production in heavy ion collisions

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