Backward-meson photoproduction at SPring-8∕LEPS

Sumihama, M.; Khemchandani, Kanchan; Nagahiro, Hideko; Nawa, Kanabu

doi:10.1063/1.3647415

Cited by 27 publications

(48 citation statements)

References 4 publications

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“…It was found that in both cases the inclusion of this factor results in an increase of χ 2 and, as a consequence, it was concluded that the consistency problem did not originate from an error in the photon flux normalization. However, subsequent measurements of the K + Λ photoproduction cross section [25][26][27] are found to be more consistent with the result of CLAS 2006 collaboration [22]. After that, most analyses of the K + Λ photoproduction use the SAPHIR data only up to W = 1.7 GeV [1,2,19,28,29].…”

Section: Introductionmentioning

confidence: 65%

Coupled K+Λ and K0Λ photo

Mart

2019

Phys. Rev. D

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The new γn → K 0 Λ data obtained from the CLAS and MAMI collaborations are analyzed by employing an effective Lagrangian method. The constructed model can describe all available experimental data in both γp → K + Λ and γn → K 0 Λ channels, simultaneously. The background part of the model is built from the appropriate intermediate states involving the nucleon, kaon, and hyperon exchanges, whereas the resonance part is constructed from the consistent interaction Lagrangians and propagators. To check the performance of the model a detailed comparison between the calculated observables and experimental data in both isospin channels is presented, from which a nice agreement can be observed. The discrepancy between the CLAS and MAMI data in the γn → K 0 Λ channel is analyzed by utilizing three different models; M1, M2, and M3 that fit the CLAS, MAMI, and both CLAS and MAMI data sets, respectively. The effect of this discrepancy is studied by investigating the significance of individual nucleon resonances and the predicted beamtarget helicity asymmetry E that has been measured by the CLAS collaboration recently. It is found that the N (1720)P13, N (1900)P13, and N (2060)D15 resonances are significant for improving the agreement between model calculation and data. This result is relatively stable to the choice of the model. The helicity asymmetry E can be better explained by the models M1 and M3. Finally, the effect of the N (1680)P11 narrow resonance on the cross section of both isospin channels is explored. It is found that the effect is more sensitive in the γn → K 0 Λ channel. In this case the model M3, that fits both CLAS and MAMI data, yields a more realistic effect.

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Section: Introductionmentioning

confidence: 65%

Coupled K+Λ and K0Λ photo

Mart

2019

Phys. Rev. D

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“…[4,12]), or perhaps it is the signature of a KKN dynamically-generated resonance [13,6]. There is good agreement between CLAS and LEPS [14] at forward angles. New measurements at CLAS have been performed using the so-called "g11" data set, obtained for pentaquark searches, but which has provided copious data for other reaction channels.…”

Section: Measured Observablesmentioning

confidence: 79%

Strangeness Physics with CLAS at Jefferson Lab

Schumacher¹,

Credé²,

Eugenio³

et al. 2010

AIP Conference Proceedings

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Abstract. We review recent developments in strangeness photo-and electro-production off the proton and neutron, as investigated using CLAS in Hall B at Jefferson Lab. By measuring sufficient spin observables one can decompose the reaction mechanism into elementary amplitudes. We discuss progress toward this end in recent data from CLAS, including cross sections and spin observables. We next discuss new results on the mass distribution of the Λ(1405), which shows signs of being a composite meson-baryon object of mixed isospin. The work on other hyperons such as the Ξ resonances will be mentioned, and future prospects for the CLAS program outlined.

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“…The plot in Figure 12 indicates that very few kaon photoproduction data were available before the start of the century. Initial measurements by SAPHIR [132,133], SPring-8 [134,135,136] and GRAAL [137,138] have been added to by a comprehensive campaign of measurements by CLAS [139,140,141,142,143]. It should be noted that, at the time of writing, a recently published paper by the BES Collaboration [144], and a study of kaon photoproduction at CLAS [145] have cast doubt on the previously quoted value of the weak decay parameter α − of the Λ.…”

Section: Kaon Photoproductionmentioning

confidence: 99%

Photoproduction reactions and non-strange baryon spectroscopy

Ireland

Pasyuk

Strakovsky

2020

Progress in Particle and Nuclear Physics

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We review the last two decades of using photon beams to measure the production of mesons, and in particular the information that can be obtained on the spectrum of light, non-strange baryons. This is a compendium of experimental results, which should be used as a complement to theoretical reviews of the subject. Lists of data sets are given, together with a comprehensive set of references. An indication of the impact of the data is presented with a summary of the results.

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Backward-meson photoproduction at SPring-8∕LEPS

Abstract: Photoproductions of S 0 and K mesons from protons were measured at backward angles. Bump structures were observed in both reaction, and a strong angular distribution of photon asymmetries was found in S 0 production. These structures are discussed connecting with baryon resonances.

Cited by 27 publications

References 4 publications

Coupled K+Λ and K0Λ photo

Coupled K+Λ and K0Λ photo

Strangeness Physics with CLAS at Jefferson Lab

Photoproduction reactions and non-strange baryon spectroscopy

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