Antibaryon Photoproduction using CLAS at Jefferson Lab

Phelps, W.

doi:10.2172/1471409

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Reaction (1) was measured by the CLAS experiment at Jefferson Lab with beam energy up to about 5.5 GeV [5]. With GlueX, we will be able to expand the beam energy up to 11.…”

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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“…Reaction (1) was measured by the CLAS experiment at Jefferson Lab with beam energy up to about 5.5 GeV [5]. With GlueX, we will be able to expand the beam energy up to 11.…”

Section: Introductionmentioning

confidence: 99%

Baryon -- anti-Baryon Photoproduction

Li,

Schumacher

2019

Preprint

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“…The reaction in Eq. 1 has been investigated by the CLAS Collaboration up to about 5 GeV photon energy [10], and is being explored at GlueX energies, but it is not the topic of this article. We will discuss here the preliminary information we have obtained for the reaction in Eq.…”

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confidence: 99%

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

Schumacher

2019

AIP Conference Proceedings

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For the first time, baryon-antibaryon photoproduction in the reaction γp → ΛΛp has been observed at photon energies from threshold near 4.9 GeV to 11.6 GeV. The measurements are in progress with the GlueX spectrometer in Hall D at Jefferson Lab. We describe here the apparatus and methods used to make these measurements and outline the physics goals of the work. Some of the newly-seen reaction phenomenology is presented. (From an invited talk to the "13th

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Baryon–anti-Baryon photoproduction

Schumacher

2020

Proceedings of the 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon

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Antibaryon Photoproduction using CLAS at Jefferson Lab

Cited by 3 publications

References 20 publications

Baryon -- anti-Baryon Photoproduction

Baryon -- anti-Baryon Photoproduction

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

Baryon–anti-Baryon photoproduction

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