Photoproduction of π+π−π0 on hydrogen with linearly polarized photons of energy 20–70 GeV

Atkinson, M.; Axon, T.; Barberis, D.; Brodbeck, T. J.; Brookes, Graham; Bunn, J.; Bussey, P.; Clegg, A.B.; Dainton, J. B.; Davenport, M.; Dickinson, B.; Diekmann, B.; Donnachie, A.; Ellison, R. J.; Flower, P.; Flynn, Phil; Galbraith, W.; Héinloth, K.; Henderson, R. C. W.; Hughes-Jones, R. E.; Hutton, J. S.; Ibbotson, M.; Jakob, H.‐P.; Jung, M.; Kemp, M.A.R.; Kumar, B. R.; Laberrigue, J.; Lafferty, G.; Lane, J.B.; Lassalle, J. C.; Lévy, J. M.; Liebenau, V.; McClatchey, Richard; Mercer, D.; Morris, J. A. G.; Morris, J. V.; Newton, D.; Paterson, C.; Patrick, G. N.; Paul, E.; Raine, C.; Reidenbach, M.; Rotscheidt, H.; Schlösser, A.; Sharp, P.; Skillicorn, I. O.; Storr, K.M.; Thompson, R. J.; Vaissière, Ch De La; Waite, A. P.; Worsell, M. F.; Yiou, T. P.

doi:10.1016/0550-3213(84)90304-3

Cited by 40 publications

(6 citation statements)

References 20 publications

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“…On the left panel of Fig. 5 we display the total cross section as a function of W for two different cases: Q 2 = 0 GeV 2 (darker curve) and for Q 2 = 7 GeV 2 (lighter curve), in comparison to the fixed target data [46][47][48][49][50][51][52][53][54][55][56][57] (a compilation of these data can be found in Ref. [58]), as well as to the data from the ZEUS Collaboration [58,59].…”

Section: Numerical Resultsmentioning

confidence: 99%

Exclusive photo- and electroproduction of excited light vector mesons via holographic model

Henkels¹,

Oliveira²,

Pasechnik³

et al. 2022

Preprint

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In this paper, we study total and differential observables of electro-and photoproduction of light ρ, ω and φ mesons as functions of the center-of-mass energy of the γp collision and momentum transfer squared |t|. The corresponding vector mesons wave functions have been computed in the framework of relativistic AdS/QCD holographic approach. A satisfactory description of all available data on ground-state ρ(1S), ω(1S) and φ(1S) mesons production cross sections has been achieved in the color dipole picture. Finally, the key observables of excited ρ(2S), ω(2S) and φ(2S) states production in γ ( * ) p collisions have been presented here for the first time using a common formalism. This study reveals a large theoretical uncertainty coming from the modeling of the partial dipole amplitude in the nonperturbative kinematical domain. Hence, the latter could benefit from future measurements of photoproduction of the excited states.

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Section: Numerical Resultsmentioning

confidence: 99%

Exclusive photo- and electroproduction of excited light vector mesons via holographic model

Henkels¹,

Oliveira²,

Pasechnik³

et al. 2022

Preprint

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“…As shown in Fig. 2 Another candidate of ωð4SÞ is ωð2330Þ, which was observed in the process γp → ρ AE ρπ ∓ by the OMEG Collaboration [58]. The mass and width of ωð2330Þ are m ¼ 2330 AE 30 MeV and Γ ¼ 435 AE 75 MeV, respectively.…”

Section: ωð4sþ and Three Candidates ωð2290þ ωð2330þ And Xð2240þmentioning

confidence: 94%

“…Because of ρπ being the dominant decay mode of a 2 ð1320Þ, the three-body channel ρρπ is an important decay mode of ωð4SÞ. By the ρρπ channel, ωð2330Þ was observed [58]. Besides, ρa 0 ð1450Þ, ηh 1 ð1170Þ, and KK also are the important decay modes.…”

Section: ωð4sþ and Three Candidates ωð2290þ ωð2330þ And Xð2240þmentioning

confidence: 99%

Study of the ω meson family and newly observed ω -like state X(2240)

Pang

Wang

et al. 2020

Phys. Rev. D

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Since the present ω meson family has not been established, in this work we carry out an investigation of the mass spectrum and Okubo-Zweig-Iizuka allowed a two-body strong decay of the S-wave and the D-wave ω mesons, and make the comparison with the experimental data of these reported ω states and the ω-like Xð2240Þ state observed by BESIII. By this study, we not only suggest the possible assignments to these observed ω states under the framework of the ω meson family, but also predict three ω mesons [ωð5SÞ, ωð2DÞ, and ωð4DÞ which are still missing in experiment. The present study may provide valuable information to further construct the ω meson family. Considering the present running status of BESIII, we also suggest that BESIII should pay more attention to the issue of the ω meson by accumulating more data.

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“…Spin density matrix elements ρ a ij are important observables because they are related with the single spin polarizations such as the parity and beam polarization asymmetries. The parity asymmetry P σ provides information [8,9,14,[28][29][30][31][32][33][34]. Notations for the curves are the same as in Fig.…”

Section: Density Matrix and Beam Polarization Asymmetrymentioning

confidence: 99%

Features of ω photoproduction off nucleon target at forward angles: dominance of π exchange with Regge cuts and scaling of differential cross-sections

Choi²,

Kong³

2019

J. Phys. G: Nucl. Part. Phys.

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We investigate photoproduction of ω off a nucleon target γN → ωN by using a Reggeized model where π(135) + σ(500) + f1(1285) + f2(1270)+Pomeron exchanges are included in the t-channel for the reaction at forward angles. The reaction mechanism at low energy is featured by the dominance of the π exchange with the absorptive cuts introduced to modulate the pion contribution to both γp → ωp and γn → ωn reactions. Necessity of σ exchange is illustrated in the analysis of the cross section from natural parity exchanges. Cross sections for differential, total, and spin density matrix with parity and beam polarization asymmetries are reproduced and compared with existing data on γp → ωp. Scaled differential cross sections of Jefferson Lab data on γp → ωp are investigated at the production angle θ = 90 • with the nonlinear trajectories for a saturation. Differential and total cross sections for the γn → ωn reaction are analyzed to compare with recent experimental data at the CBELSA/TAPS Collaboration. An application to the γp → ω∆ + reaction is presented to demonstrate the significance of the π exchange in the total and differential cross sections. PACS numbers: 11.55.Jy, 13.40.-f, 13.60.Le for unnatural parity (P = −(−1) J ) exchanges.The Regge propagator is given bywritten in the collective form for the ϕ meson of spin-J which stands for all the mesons considered here. s 0 = 1 GeV 2 . The phase factor is, in general, taken to be of the canonical form, 1 2 [(−1) J + e −iπαJ (t) ], for each meson exchange. Photon and vector meson polarizations

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Photoproduction of π+π−π0 on hydrogen with linearly polarized photons of energy 20–70 GeV

Cited by 40 publications

References 20 publications

Exclusive photo- and electroproduction of excited light vector mesons via holographic model

Exclusive photo- and electroproduction of excited light vector mesons via holographic model

Study of the ω meson family and newly observed ω -like state X(2240)

Features of ω photoproduction off nucleon target at forward angles: dominance of π exchange with Regge cuts and scaling of differential cross-sections

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