Moments of angular distribution and beam asymmetries in 
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 photoproduction at GlueX

Mathieu, V.; Albaladejo, M.; Fernández-Ramírez, C.; Jackura, A.; Mikhasenko, M.; Pilloni, A.; Szczepaniak, Adam P.

doi:10.1103/physrevd.100.054017

Cited by 25 publications

(16 citation statements)

References 31 publications

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“…Subsequent measurement from GlueX indicate agreement with prediction [31]. Generalizations for the beam asymmetries and moments of angular distribution for ηπ 0 photoproduction have also been recently made [466].…”

Section: Combine Energy Regimessupporting

confidence: 52%

Strong QCD from Hadron Structure Experiments

Brodsky

Burkert

Carman

et al. 2020

Int. J. Mod. Phys. E

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The topical workshop Strong QCD from Hadron Structure Experiments took place at Jefferson Lab from November 6–9, 2019. Impressive progress in relating hadron structure observables to the strong QCD mechanisms has been achieved from the ab initio QCD description of hadron structure in a diverse array of methods in order to expose emergent phenomena via quasi-particle formation. The wealth of experimental data and the advances in hadron structure theory make it possible to gain insight into strong interaction dynamics in the regime of large quark–gluon coupling (the strong QCD regime), which will address the most challenging problems of the Standard Model on the nature of the dominant part of hadron mass, quark–gluon confinement, and the emergence of the ground and excited state hadrons, as well as atomic nuclei, from QCD. This workshop aimed to develop plans and to facilitate the future synergistic efforts between experimentalists, phenomenologists, and theorists working on studies of hadron spectroscopy and structure with the goal to connect the properties of hadrons and atomic nuclei available from data to the strong QCD dynamics underlying their emergence from QCD. These results pave the way for a future breakthrough extension in the studies of QCD with an Electron–Ion Collider in the U.S.

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Section: Combine Energy Regimessupporting

confidence: 52%

Strong QCD from Hadron Structure Experiments

Brodsky

Burkert

Carman

et al. 2020

Int. J. Mod. Phys. E

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“…All the waves describing the η ( ) π system have positive reflectivity = +. In the Regge asymptotic limit, reflectivity coincides with naturality of the exchange; at the nucleon vertex, the natural IP and f 2 are the dominant exchanges [19]. A single negative reflectivity wave was included in the fit, (L , M, ) = (0, 0, −), that includes possible reducible backgrounds.…”

Section: Compass Intensitiesmentioning

confidence: 99%

$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$ in the double-Regge region

et al. 2021

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The production of $$\eta ^{(\prime )}\pi $$ η ( ′ ) π pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to $$\eta ^{(\prime )}\pi $$ η ( ′ ) π production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction $$\pi ^-p\rightarrow \eta ^{(\prime )} \pi ^- \,p$$ π - p → η ( ′ ) π - p measured by COMPASS. We show that the data in $$2.4< m_{\eta ^{(\prime )}\pi } < 3.0{\mathrm {\,GeV}} $$ 2.4 < m η ( ′ ) π < 3.0 GeV can be described by amplitudes based on double-Regge exchanges. The angular distribution of the meson pairs, in particular in the $$\eta ' \pi $$ η ′ π channel, can be attributed to flavor singlet exchanges, suggesting the presence of a large gluon content that couples strongly to the produced mesons.

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“…ηπ for a 2 and ππ for f 2 . The general case of twopseudoscalar photoproduction with a linearly polarized beam has been treated in detail in [29]. We summarize here the relevant formulae when the tensor meson is so narrow that the existence of other partial waves can be neglected.…”

Section: Appendix E: Spin and Polarization Observablesmentioning

confidence: 99%

“…The convention is such that the natural (unnatural) exchanges contribute only to ρ ðþÞ mm 0 (ρ ð−Þ mm 0 ) at the leading order in the energy squared [29].…”

Section: Appendix E: Spin and Polarization Observablesmentioning

confidence: 99%

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Exclusive tensor meson photoproduction

et al. 2020

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We study tensor meson photoproduction outside of the resonance region, at beam energies of a few GeVs. We build a model based on Regge theory that includes the leading vector and axial exchanges. We consider two determinations of the unknown helicity couplings and fit to the recent a 2 photoproduction data from CLAS. Both choices give a similar description of the a 2 cross section but result in different predictions for the parity asymmetries and the f 2 photoproduction cross section. We conclude that new measurements of f 2 photoproduction in the forward region are needed to pin down the correct production mechanism. We also extend our predictions to the 8.5 GeV beam energy, where current experiments are running.

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

Cited by 25 publications

References 31 publications

Strong QCD from Hadron Structure Experiments

Strong QCD from Hadron Structure Experiments

$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$ in the double-Regge region

Exclusive tensor meson photoproduction

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