Measurement of the beam asymmetry 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Σ</mml:mi></mml:math>
 for 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math>
 photoproduction on the proton at 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>E</mml:mi><mml:mi>γ</mm

Ghoul, H. Al; Anassontzis, E.G.; Austregesilo, A.; Barbosa, Fernando; Barnes, A.; Beattie, T. D.; Bennett, D. W.; Бердников, В. В.; Black, T.; Boeglin, W.; Briscoe, W. J.; Brooks, W. K.; Cannon, Bradford E.; Chernyshov, Oleksii O.; Chudakov, E.; Credé, V.; Dalton, M. M.; Deur, A.; Dobbs, S.; Dolgolenko, A.; Dugger, M.; Dzhygadlo, R.; Egiyan, H.; Eugenio, P.; Fanelli, C.; Foda, A. M.; Frye, J.; Furletov, S.; Gan, L.; Gasparian, A.; Герасимов, А. С.; Gevorgyan, N.; Goetzen, K.; Goryachev, V.; Guo, L.; Hakobyan, H.; Hardin, John; Henderson, A.; Huber, G. M.; Ireland, D. G.; Ito, M. M.; Jarvis, N. S.; Jones, R. T.; Kakoyan, V.; Kamel, Mahmoud M.; Klein, F. J.; Kliemt, R.; Kourkoumeli, C.; Kuleshov, S.; Kuznetsov, Ivan; Lara, M.; Larin, I.; Lawrence, D.; Levine, W. I.; Livingston, K.; Lolos, G. J.; Lyubovitskij, Valery E.; Mack, D.; Mattione, P.; Matveev, V.; McCaughan, M.; McCracken, M. E.; McGinley, W.; McIntyre, Justin I.; Méndez, Rodrigo Romero; Meyer, C. A.; Miskimen, R.; Mitchell, R. E.; Mokaya, F.; Moriya, K.; Nerling, F.; Nigmatkulov, G.; Ochoa, N.; Ostrovidov, A. I.; Papandreou, Z.; Patsyuk, M.; Pedroni, R.; Pennington, M.R.; Pentchev, L.; Peters, K.; Pooser, E.; Pratt, B.; Qiang, Y.; Reinhold, J.; Ritchie, B. G.; Robison, Lee; Romanov, Dmitry; Salgado, C.; Schumacher, R. A.; Schwarz, C.; Schwiening, J.; Semenov, A. Yu.; Семенова, И. А.; Seth, K. K.; Shepherd, M. R.; Smith, E. S.; Sober, D. I.; Somov, A.; Somov, S.; Soto, Orlando; Sparks, N. A.; Staib, M. J.; Stevens, J. R.; Strakovsky, I. I.; Subedi, A.; Tarasov, V. V.; Taylor, S.; Teymurazyan, A.; Tolstukhin, I.; Tomaradze, A.; Toro, A.; Tsaris, Aristeidis; Vasileiadis, G.; Vega, Inés de; Walford, N. K.; Werthmüller, D.; Whitlatch, T.; Williams, M.; Wolin, E.; Xiao, Ting; Zarling, J.; Zhang, Zhen-Yu; Zihlmann, B.; Mathieu, V.; Nys, Jannes

doi:10.1103/physrevc.95.042201

Cited by 68 publications

(86 citation statements)

References 23 publications

(28 reference statements)

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“…The observable Σ is close to unity and only mildly t-dependent. In tendency this is in agreement with a glueX measurement for π 0 photoproduction at small −t [40].…”

Section: B Spin Effectssupporting

confidence: 79%

Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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We investigate wide-angle π 0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the π 0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

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“…The observable Σ is close to unity and only mildly t-dependent. In tendency this is in agreement with a glueX measurement for π 0 photoproduction at small −t [40].…”

Section: B Spin Effectssupporting

confidence: 79%

Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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“…This is not restrictive as the target is not polarized in GlueX, and the measured intensities are not sensitive to the details of the nucleon helicity structure. Finally, we consider only the amplitudes with = + based on the observation that natural parity exchanges are dominant in the energy range of interest [9,13]. The model is fully determined by the knowledge of the 2 + 1 projections of each spin wave.…”

Section: The Modelmentioning

confidence: 99%

“…Our goal is to investigate sensitivity of these observables to the presence of an exotic meson and to guide future experimental analysis by identifying which combinations of moments are most relevant for the identification of this resonance. In order to illustrate the sensitivity of the moments to exotic contributions, we discuss production of resonant S-, P -, D-waves in the forward direction which are produced dominantly by natural exchanges in the t channel [8,9].…”

Section: Introductionmentioning

confidence: 99%

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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“…2. Asymmetry measurements for the production of π 0 and η mesons decaying to two photons measured as a function of t. Colored curves indicate various theory models with more information available at [3]. Fig.…”

Section: Pseudoscalar Beam Asymmetriesmentioning

confidence: 99%

The GlueX Experiment: Recent Results and Future Plans

Zarling

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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The GlueX experiment, located in experimental Hall D of Jefferson Lab, seeks to map the spectrum of light mesons in search of exotic hybrid mesons, a predicted class of hadronic states with explicit gluonic degrees of freedom. GlueX is a photoproduction experiment utilizing a linearly polarized photon beam at E γ = 8-9 GeV and a large acceptance spectrometer. The experiment has already collected orders of magnitude more data than previous experiments at similar energies. We show results on asymmetry measurements in the production of pseudoscalars mesons, which refine our understanding of production mechanisms in photoproduction at our energies. We also present results on J/ψ photoproduction, which provides model constraints on heavy quark photoproduction and the ability to search for s-channel production of pentaquark candidate P + c states.

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Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ

Cited by 68 publications

References 23 publications

Twist-3 contributions to wide-angle photoproduction of pions

Twist-3 contributions to wide-angle photoproduction of pions

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

The GlueX Experiment: Recent Results and Future Plans

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