Vector meson photoproduction with a linearly polarized beam

Mathieu, V.; Nys, Jannes; Fernández-Ramírez, C.; Jackura, A.; Pilloni, A.; Sherrill, N.; Szczepaniak, Adam P.; Fox, Geoffrey

doi:10.1103/physrevd.97.094003

Cited by 21 publications

(20 citation statements)

References 65 publications

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“…7 The s-channel (t-channel) frame and the helicity (GJ) frame lead to the same SDME as demonstrated in the Appendix of Ref. [25]. The moments built in the s-channel can thus be compared to the ones extracted in the helicity frame.…”

Section: Discussionmentioning

confidence: 91%

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Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX

et al. 2019

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In the search for exotic mesons, the GlueX collaboration will soon extract moments of the ηπ 0 angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam, and build a model for the reaction γp → ηπ 0 p. The model includes resonant S-, P -, D-waves in ηπ, produced by natural exchanges. Moments of the ηπ 0 angular distribution are computed with and without the P -wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the P -wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the P -wave and the dominant S-and D-waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic P -wave. * vmathieu@ucm.es † albalade@jlab.org

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Section: Discussionmentioning

confidence: 91%

“…They sign was consistent with a beam asymmetry Σy = 1 for a P -wave produced by naturality exchange, cf. Eq (25)4.…”

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confidence: 99%

Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX

et al. 2019

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“…In η photoproduction, the PWA models are less constrained by the available low-energy data and we have shown how the high-energy data can help reducing uncertainties, specifically those related to unnatural exchanges [11,13]. Our prediction for the π 0 photopro-duction cross section [10] compares favorably with the CLAS data [24], and our results on π 0 , η and η photoproduction beam asymmetries [14,15] are in agreement with the GlueX results [6,25]. The main conclusion one can draw from these comparisons is that, at forward scattering angles, the natural Regge poles dominate over the unnatural ones and over the non-pole contributions.…”

Section: Introductionmentioning

confidence: 54%

Global analysis of charge exchange meson production at high energies

et al. 2018

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Many experiments that are conducted to study the hadron spectrum rely on peripheral resonance production. Hereby, the rapidity gap allows the process to be viewed as an independent fragmentation of the beam and the target, with the beam fragmentation dominated by production and decays of meson resonances. We test this separation by determining the kinematic regimes that are dominated by factorizable contributions, indicating the most favorable regions to perform this kind of experiments. In doing so, we use a Regge model to analyze the available world data of charge exchange meson production with beam momentum above 5 GeV in the laboratory frame that are not dominated by either pion or Pomeron exchanges. We determine the Regge residues and point out the kinematic regimes which are dominated by factorizable contributions.

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“…Spin density matrix elements (SDMEs) and polarization observables can be used to provide and use-ful information on the relative contribution of the different Regge trajectories. [34] This theory is expected to work well for energies above the resonance region, that is roughly s > 10 GeV 2 .…”

Section: Regge Theorymentioning

confidence: 97%

“…The model developed by JPAC [34] incorporates a psudoscalar mesons π 0 and η for the unnatural exchanges and the Pomeron, a 2 and f 2 natural exchanges in the t-channel.The schematic representation of this model is shown Figure 5.6.1. The The unpolarized SDMEs were extracted from the same data by fitting angular distributions in the helicity and Gottfried Jackson frames.…”

Section: The Joint Physics Analysis Center (Jpac) Modelmentioning

confidence: 99%

High Statistics Analysis of All-Neutral Decays of Vector Mesons with the Radphi Experiment

Mokaya

2018

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time of research. Through him I have come to learn a lot. My thesis committee guided me throughout the years. Thank you to Dr. Peter Schweitzer who always had his door open and answered any questions I had. Dr Jeffrey Schweitzer, thank you very much for all the life lessons you gave me you literally taught me not to be a quitter and through you I learned that any challenge I encounter is a problem waiting to be solved. Thanks to the members of my committee for their work reading this thesis and also to the Physics department at the University of Connecticut for creating a great atmosphere for learning and growth. I thank my fellow labmates in for the stimulating discussions and their willingness to help always , Alex, Brendan and James thank you. Nobody has been more important to me in my entire graduate school than my family members. I would like to thank the members of my family and whose love and guidance are with me in whatever I pursue. Most importantly I wish to thank my dad, for believing in me and constant encouragement and spiritual support throughout my life in general. Finally to my loving husband and daughter, Joshua and Jenise, thank you for being patient and for providing unending inspiration and support. Thank you! v

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Vector meson photoproduction with a linearly polarized beam

Cited by 21 publications

References 65 publications

Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX

Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX

Global analysis of charge exchange meson production at high energies

High Statistics Analysis of All-Neutral Decays of Vector Mesons with the Radphi Experiment

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