Strangeness Photoproduction at the BGO-OD Experiment

Jude, Thomas; Alef, S.; Bauer, Patrick; Beck, R.; Cole, P. L.; Salvo, R. Di; Elsner, D.; Fantini, A.; Freyermuth, O.; Ghio, F.; Gridnev, A.; Hammann, D.; Hannappel, J.; Kohl, Katrin; Kozlenko, N.; Lapik, A.; Sandri, P. Levi; Lisin, V.; Mandaglio, G.; Messi, R.; Moricciani, D.; Nedorezov, V.; Novinskiy, D.; Pedroni, P.; Polonski, A.; Reitz, B.; Romaniuk, M.; Scheluchin, G.; Schmieden, H.; Sumachev, V. V.; Тараканов, В. И.; Tillmanns, Christian

doi:10.1134/s1063779619050113

Cited by 7 publications

(6 citation statements)

References 39 publications

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“…G 0 is the free three-baryon propagator. The two off-shell t-matrices t 12 and t 31 are solutions of the Lippmann-Schwinger equation of subsystem (12) or (31), respectively. For the solution, we use two momentum Jacobi bases:…”

Section: Appendix B: Faddeev-yakubovsky Equations For Hypernucleimentioning

confidence: 99%

“…An important source of information has been the spectroscopy of hypernuclei [6]. New experiments are planned at facilities like J-PARC, FAIR, MAMI and JLab [7][8][9][10][11][12], some to study the scattering of hyperons on nucleons, but mostly measurements of bound states of ordinary nuclei with hyperons. Such new and very probably more precise data will not only be phenomenologically interesting, but also enable us to explore the underlying interactions in more detail.…”

Section: Introductionmentioning

confidence: 99%

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Jacobi no-core shell model for p-shell hypernuclei

Haidenbauer

Meißner

et al. 2020

Eur. Phys. J. A

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We extend the recently developed Jacobi no-core shell model to hypernuclei. Based on the coefficients of fractional parentage for ordinary nuclei, we define a basis where the hyperon is the spectator particle. We then formulate transition coefficients to states that single out a hyperon–nucleon pair which allow us to implement a hypernuclear many-baryon Hamiltonian for p-shell hypernuclei. As a first application, we use the basis states and the transition coefficients to calculate the ground states of $$^{4}_{\varLambda }\hbox {He}$$ Λ 4 He , $$^{4}_{\varLambda }\hbox {H}$$ Λ 4 H , $$^{5}_{\varLambda }\hbox {He}$$ Λ 5 He , $$^{6}_{\varLambda }\hbox {He}$$ Λ 6 He , $$^{6}_{\varLambda }\hbox {Li}$$ Λ 6 Li , and $$^{7}_{\varLambda }\hbox {Li}$$ Λ 7 Li and, additionally, the first excited states of $$^{4}_{\varLambda }\hbox {He}$$ Λ 4 He , $$^{4}_{\varLambda }\hbox {H}$$ Λ 4 H , and $$^{7}_{\varLambda }\hbox {Li}$$ Λ 7 Li . In order to obtain converged results, we employ the similarity renormalization group (SRG) to soften the nucleon–nucleon and hyperon-nucleon interactions. Although the dependence on this evolution of the Hamiltonian is significant, we show that a strong correlation of the results can be used to identify preferred SRG parameters. This allows for meaningful predictions of hypernuclear binding and excitation energies. The transition coefficients will be made publicly available as HDF5 data files.

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Section: Appendix B: Faddeev-yakubovsky Equations For Hypernucleimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Jacobi no-core shell model for p-shell hypernuclei

Haidenbauer

Meißner

et al. 2020

Eur. Phys. J. A

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“…In addition, this data helps to constrain the t-channel K and K * exchange at forward angles and low momentum transfer. More data regarding strangeness photoproduction can be expected from the BGOOD facility in the future [137,328,329,330].…”

Section: Strangeness Photoproductionmentioning

confidence: 99%

Light Baryon Spectroscopy

Thiel,

Afzal,

Wunderlich

2022

Preprint

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This review treats the advances in Light Baryon Spectroscopy of the last two decades, which were mainly obtained by measuring meson-production reactions at photon facilities all over the world. We provide a consistent compendium of experimental results, as well as a review of the theoretical methods of amplitude analysis used to analyze the data. The most significant datasets are presented in detail and are listed in combination with a full set of the relevant references. In addition, a brief summary of spin-formalisms, which are ubiquitous in Light Baryon Spectroscopy, as well as a review on complete experiments, are provided. The synthesis of the reviewed knowledge is presented in a full interpretation of the new results on the Light Baryon Spectrum.

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“…First we check the quality of our approximation by calculating the magnetic transition moment κ M given in (5) and (9). We find…”

Section: Parameter Estimatesmentioning

confidence: 99%

“…With recent and ongoing experiments on hyperon production (e.g. at ELSA [9], J-LAB [10,11], GSI [12,13], BEPC II [14,15], KEKB [16], CESR [17]) and in particular with the upcoming PANDA experiment [18,19] as a hyperon-antihyperon factory, it is absolutely timely to establish at least upper limits for the angular asymmetry of the Σ 0 decay.…”

Section: Introductionmentioning

confidence: 99%

Constraining P and CP violation in the main decay of the neutral Sigma hyperon

2019

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On general grounds based on quantum field theory the decay amplitude for Σ 0 → Λγ consists of a parity conserving magnetic and a parity violating electric dipole transition moment. Because of the subsequent self-analyzing weak decay of the Λ hyperon the interference between magnetic and electric dipole transition moment leads to an asymmetry in the angular distribution. Comparing the decay distributions for the Σ 0 hyperon and its antiparticle gives access to possible C and CP violation. Based on flavor SU(3) symmetry the present upper limit on the neutron electric dipole moment can be translated to an upper limit for the angular asymmetry. It turns out to be far below any experimental resolution that one can expect in the foreseeable future. Thus any true observation of a CP violating angular asymmetry would constitute physics beyond the standard model, even if extended by a CP violating QCD theta-vacuum-angle term.

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Strangeness Photoproduction at the BGO-OD Experiment

Cited by 7 publications

References 39 publications

Jacobi no-core shell model for p-shell hypernuclei

Jacobi no-core shell model for p-shell hypernuclei

Light Baryon Spectroscopy

Constraining P and CP violation in the main decay of the neutral Sigma hyperon

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