Observation of γp→ΛΛ¯p with GlueX at Jefferson Lab

Schumacher, R. A.; Li, Hao

doi:10.1063/1.5118375

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…GlueX is well suited to study baryon-anti-baryon photoproduction and some preliminary results for p p and Λ Λ have already been reported at previous conferences [2,3]. These reactions are interesting as they allow to search for baryonium, a bound baryon-anti-baryon system which has so far not been observed.…”

Section: λ λ Productionmentioning

confidence: 99%

The strangeness program at GlueX

Pauli

2022

14th International Conference on Hypernuclear and Strange Particle Physics - HYP2022, June 27, 2022 to July 1, 2022 Pragu

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The GlueX experiment located at Jefferson Lab studies the spectrum of hadrons using photoproduction on a LH 2 target in a wide variety of final states. With its detector system capable of measuring neutral and charged final state particles over almost the full solid angle, and very good particle identification capabilities, GlueX can measure many different hadrons containing strangeness. A linearly polarized photon beam allows the measurement of polarization observables, which contain information about the production mechanisms involved in generating strange particles in photoproduction. In addition, GlueX can perform precise cross-section measurements, which help to study the spectrum of strange hadrons. In this presentation, the GlueX experiment is introduced, and recent progress of its strangeness program is discussed. We present recent results on Σ 0 beam asymmetries, Λ(1520) spin-density matrix elements and ongoing studies of the Λ(1405) lineshape. We also present our recent progress on measurements of Λ Λ and Ξ ( * ) photoproduction. Also, future prospects for strangeness measurements at GlueX are discussed.

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Section: λ λ Productionmentioning

confidence: 99%

The strangeness program at GlueX

Pauli

2022

14th International Conference on Hypernuclear and Strange Particle Physics - HYP2022, June 27, 2022 to July 1, 2022 Pragu

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“…4 GeV with higher statistics. Very preliminary results for Reaction (2) were presented previously [6].…”

Section: Introductionmentioning

confidence: 99%

Baryon -- anti-Baryon Photoproduction

Li,

Schumacher

2019

Preprint

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Baryon-anti-baryon photoproduction off a proton target is being studied in detail at Jefferson Lab with the GlueX Experiment. We observe p p and, for the first time, Λ Λ photoproduction (with Λ → π − p, Λ → π + p) from thresholds up to E γ = 11.4 GeV. Preliminary spectra from data accumulated during the GlueX Phase-I period are shown. Angular distributions of the photoproduced hyperons indicate more than one production mechanism in the reaction channel γ p → Λ Λp. A Monte Carlo simulation with four mechanisms, tested through comparison between simulation and experimental data, is presented.Little relevant theoretical work has been done on p p and Λ Λ photoproduction. In the energy range of the GlueX experiment, one expects to see the dominant t-channel exchange of some mesons, Pomerons or Reggeons leading to the p p final state. One recent theoretical effort [1] to model the baryon-anti-baryon pair photoproduction is illustrated in Fig. 1. It assumes that the pair is the decay product of some intermediate scalar mesons at the upper vertex. According to this model, both vector mesons and axial-vector mesons as well as the Reggeons are allowed in the t-channel exchange. Aside from the different couplings to the final state baryons, this model predicts very similar t-dependence of the cross section and the beam spin asymmetry, Σ, for both reactions. The ongoing experimental measurement will be compared with those predictions to check the validity of the proposed theoretical model. In addition, as all proposed intermediate scalar mesons are below threshold of the two reactions, it may be possible to identify intermediate states of higher masses, as well as production mechanisms different than t-channal exchange.Recently, the BES-III collaboration reported observations of nearthreshold enhancement in the radiative decay of J/Ψ → γ{p p} [2] and the decay of J/Ψ → {Λ Λ} [3]. Because the two reactions we investigate feature similar final states, we seek any unexpected phenomenon observed in the corresponding near-threshold regions. There has been a long history at CERN and other facilities, searching for "baryonium" in the p p system [4], without any evidence of continuum quasi-bound states found. This makes the BES-III result more interesting and adds motivation to examining the related channels at GlueX.

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The strangeness program at GlueX

Pauli

2022

EPJ Web Conf.

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The GlueX experiment located at Jefferson Lab studies the spectrum of hadrons using photoproduction on a LH2 target in a wide variety of final states. With its detector system capable of measuring neutral and charged final state particles over almost the full solid angle, and very good particle identification capabilities, GlueX can measure many different hadrons containing strangeness. A linearly polarized photon beam allows the measurement of polarization observables, which contain information about the production mechanisms involved in generating strange particles in photoproduction. In addition, GlueX can perform precise cross-section measurements, which help to study the spectrum of strange hadrons. In this presentation, the GlueX experiment is introduced, and recent progress of its strangeness program is discussed. We present recent results on Σ0 beam asymmetries, Λ(1520) spin-density matrix elements and ongoing studies of the Λ(1405) lineshape. We also present our recent progress on measurements of ΛΛ̅ and Ξ(∗) photoproduction. Also, future prospects for strangeness measurements at GlueX are discussed.

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Observation of γp→ΛΛ¯p with GlueX at Jefferson Lab

Cited by 3 publications

References 12 publications

The strangeness program at GlueX

The strangeness program at GlueX

Baryon -- anti-Baryon Photoproduction

The strangeness program at GlueX

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