Study of YY production in two, three and four body final states by 3.0, 3.6 and 4.0 GeV/c antiprotons in hydrogen

Musgrave, B.; Petmezas, G.; Riddiford, Lynn M.; Böck, Rudolf; Fett, Ė.; French, B. R.; Kinson, J.B.; Peyrou, Ch.; Szeptycka, M.; Badier, J.; Bazin, M.; Blaskovic, L.; Equer, B.; Huc, J.; Borenstein, S.; Goldsack, S. J.; Miller, D. H.; Meyer, John C.; Revel, D.; Tallini, B.; Zylberajch, S.

doi:10.1007/bf02739338

Cited by 59 publications

(18 citation statements)

References 7 publications

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“…Therefore, PANDA is well-suited for a comprehensive baryon spectroscopy program in the multi-strange and charm sector. The expected cross section for final states containing a Ξ + Ξ − pair is on the order of μb [23], thus giving the possibility to produce 10 6 (excited) Ξ − events per day, which compares favorably to the 5.3×10 4 produced events expected per day at KLF. The cross section of the reactionpp → Ω −Ω + has never been measured, but is predicted to be σ 2 nb at pp = 7 GeV/c [24].…”

Section: Introductionmentioning

confidence: 90%

Study of excited $$\varvec{\varXi }$$ baryons with the $$\overline{\text{ P }}$$ANDA detector

et al. 2021

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The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards $$N^*$$ N ∗ and $$\varDelta $$ Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $$N^*$$ N ∗ and $$\varDelta $$ Δ spectra. The future antiproton experiment $$\overline{\text{ P }}$$ P ¯ ANDA will provide direct access to final states containing a $${\overline{\varXi }}\varXi $$ Ξ ¯ Ξ pair, for which production cross sections up to $$\mu \text{ b }$$ μ b are expected in $$\bar{\text{ p }}$$ p ¯ p reactions. With a luminosity of $$L=10^{31}$$ L = 10 31 cm$$^{-2}$$ - 2 s$$^{-1}$$ - 1 in the first phase of the experiment, the expected cross sections correspond to a production rate of $$\sim 10^6\, \text{ events }/\text{day }$$ ∼ 10 6 events / day . With a nearly $$4\pi $$ 4 π detector acceptance, $$\overline{\text{ P }}$$ P ¯ ANDA will thus be a hyperon factory. In this study, reactions of the type $$\bar{\text{ p }}$$ p ¯ p $$\rightarrow $$ → $${\overline{\varXi }}^{+}$$ Ξ ¯ + $$\varXi ^{*-}$$ Ξ ∗ - as well as $$\bar{\text{ p }}$$ p ¯ p $$\rightarrow $$ → $${\overline{\varXi }}^{*+}$$ Ξ ¯ ∗ + $$\varXi ^{-}$$ Ξ - with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.

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Section: Introductionmentioning

confidence: 90%

Study of excited $$\varvec{\varXi }$$ baryons with the $$\overline{\text{ P }}$$ANDA detector

et al. 2021

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“…It would be illuminating to see how spin observables such as polarisation and spin correlations behave in the multi-strange sector. However, so far only a few bubble-chamber events have been found for Ξ − and Ξ 0 production inpp annihilations [21]. Triple-strange hyperon production has not been observed at all inpp and the same is true for single-charmed hyperons.…”

Section: Hyperon Productionmentioning

confidence: 97%

Hyperon Physics with PANDA at FAIR

Schönning

2020

EPJ Web Conf.

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Hyperons provide new angles on two of the most challenging problems in contemporary physics: a coherent and quantitative description of the strong interaction, and the matter-antimatter asymmetry of the Universe. The production dynamics and the electromagnetic structure of strange hyperons, as well as hyperon spectroscopy, give insights into the strong interaction in the confinement domain. Furthermore, two-body decays of strange hyperons provide clean tests of CP symmetry, an essential piece to the matter-antimatter puzzle. The future experiment PANDA at FAIR offers unique possibilities to study different aspects of hyperons using antiproton beams. In particular, the hitherto almost unexplored multi-strange sector will be addressed. The expected large production cross sections of hyperons and the versatile, near 4 π detector design makes PANDA a veritable hyperon factory already from the first phase of operation. In these proceedings, the opportunities for hyperon physics with PANDA will be outlined. I will also address how we can benefit from the weak hyperon decays, that provide straight-forward access to the full spin density matrix.

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“…The reaction p + N → + − has a maximum around p p ≈ 3 GeV/c [10] and a threshold at p p ≈ 2.65 GeV/c, while the production starts at p p ≈ 3.1 GeV/c. Using antiprotons at 3 GeV/c, the − production is maximized and only two particles are present in the final state.…”

Section: Panda Experimentsmentioning

confidence: 99%

Search for Λ–Λ hyperuclei using antiprotons in PANDA

Introzzi

Balestra

Iazzi

et al. 2014

EPJ Web of Conferences

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Abstract. The Double Hypernuclei are the only systems that allow to study the hyperonhyperon interaction because the hyperon-hyperon scattering experiments are at present impossible. Experimental data are still very scarce, due to the difficulty of producing the doubly strange hyperon − , from which a double hypernucleus is formed. The formation of such a hypernucleus proceeds through a multiple-step process and the measurement of the relevant parameters (e.g. energy separation and decay branching ratios) requires high statistics. The PANDA Collaboration planned to exploit the intense beam of the HESR machine at the future facility FAIR to produce − hyperons from antiproton annihilation in nuclei. A 12 C target will be inserted inside the ring: the sizes of the target and the beam spot overlap play a crucial role to avoid serious damage of beam and detectors. The status of the art of the present data, the design of the optimized target and the tests on the prototype will be presented.

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Study of YY production in two, three and four body final states by 3.0, 3.6 and 4.0 GeV/c antiprotons in hydrogen

Cited by 59 publications

References 7 publications

Study of excited $$\varvec{\varXi }$$ baryons with the $$\overline{\text{ P }}$$ANDA detector

Study of excited $$\varvec{\varXi }$$ baryons with the $$\overline{\text{ P }}$$ANDA detector

Hyperon Physics with PANDA at FAIR

Search for Λ–Λ hyperuclei using antiprotons in PANDA

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