Photoproduction of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>ρ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Meson on the Proton at Large Momentum Transfer

Battaglieri, M.; Anciant, E.; Anghinolfi, M.; Vita, R. De; Golovach, E.; Laget, J. M.; Mokeev, V.; Ripani, M.; Adams, G. S.; Amaryan, M. J.; Armstrong, D. S.; Asavapibhop, B.; Asryan, G.; Audit, G.; Auger, T.; Avakian, H.; Barrow, S.; Beard, K.; Bektasoglu, M.; Berman, B. L.; Bianchi, N.; Biselli, A.; Boiarinov, S.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Burkert, Volker; Calarco, J. R.; Capitani, G. P.; Carman, D. S.; Carnahan, B.; Cazes, A.; Cetina, C.; Cole, P. L.; Coleman, Alan; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J. P.; DeSanctis, E.; Degtyarenko, P. V.; Demirchyan, R.; Denizli, H.; Dennis, L.; Dharmawardane, K. V.; Dhuga, K. S.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Eckhause, M.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Farhi, L.; Feuerbach, R. J.; Ficenec, J.; Forest, T. A.; Freyberger, A.; Frolov, V. V.; Funsten, H. O.; Gaff, S. J.; Gai, M.; Gilad, S.; Gilfoyle, G. P.; Giovanetti, K. L.; Griffioen, K. A.; Guidal, M.; Guillo, M.; Gyurjyan, V.; Hancock, D.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hicks, R. S.; Holtrop, M.; Hyde‐Wright, C. E.; Ito, M. M.; Joo, K.; Kelley, J. H.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Kramer, L.; Kuang, Y.; Kuhn, S. E.; Lawrence, D.; Lucas, M.; Lukashin, K.; Major, R. W.; Manak, J. J.; Marchand, Claude; McAleer, S.; McCarthy, J.; McNabb, J. W.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Muccifora, V.; Muêller, J.; Mutchler, G. S.; Napolitano, J.; Nelson, S. O.; Niczyporuk, B.; Niyazov, R. A.; O’Brien, J. T.; Opper, A. K.; Peterson, G. A.; Philips, S. A.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Polli, E.; Preedom, B. M.; Price, J. W.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Reolon, A. R.; Riccardi, G.; Ricco, G.; Ritchie, Barry; Ronchetti, F.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabourov, K.; Salgado, C.; Sanzone-Arenhovel, M.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Skabelin, A. V.; Smith, E. S.; Smith, T.; Smith, L. C.; Sober, D. I.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stoler, P.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Todor, L.; Thompson, R.; Vineyard, M. F.; Vlassov, A. V.; Weinstein, L. B.; Weisberg, A.; Weller, H. R.; Weygand, D. P.; Whisnant, C. S.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, Jaeseok; Zhang, B.; Zhao, J.; Zhou, Zhengfang

doi:10.1103/physrevlett.87.172002

Cited by 52 publications

(18 citation statements)

References 26 publications

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“…The differential cross sections for the reaction γ p → n π + were measured with the CEBAF Large Acceptance Spectrometer (CLAS) [6] and the bremsstrahlung photon-tagging facility ("photon tagger") [7] in Hall B of the Thomas Jefferson National Accelerator Facility (JLab) as part of a set of experiments running at the same time with the same experimental configuration (cryogenic target, tagger, and CLAS) called the "g1c" run period. The cross sections were part of a program of meson photoproduction measurements undertaken using CLAS and the photon tagger [5,8,9,10,11,12,13,14,15].…”

Section: Methodsmentioning

confidence: 99%

π+photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

Dugger¹,

Ritchie²,

Ball³

et al. 2009

Phys. Rev. C

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122

104

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Differential cross sections for the reaction γ p → n π + have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.725 to 2.875 GeV. Where available, the results obtained here compare well with previously published results for the reaction. Agreement with the SAID and MAID analyses is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been made up to 2.7 GeV. Resonance couplings have been extracted and compared to previous determinations. With the addition of these cross sections to the world data set, significant changes have occurred in the high-energy behavior of the SAID cross-section predictions and amplitudes.

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Section: Methodsmentioning

confidence: 99%

π+photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

Dugger¹,

Ritchie²,

Ball³

et al. 2009

Phys. Rev. C

Self Cite

122

104

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show abstract

“…Consequently, as shown in the present work, our rigorous theoretical analyses on the presently available highstatistics and wide-angle-coverage experimental data for the various physical observables will be valuable for a profound understanding for the light-flavor (ρ and ω) and hidden-flavor (J/ψ) vector meson photoproductions [64][65][66][67][68][69][70][71]. Related works will appear elsewhere.…”

Section: Discussionmentioning

confidence: 99%

Pomeron, nucleon-resonance, and (0+,0−,1+) -meson contributions in ϕ -meson photoproduction

Kim

Nam

2019

Phys. Rev. C

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We investigate the reaction mechanism of the φ-meson photoproduction off the proton target, i.e., γp → φp, up to √ s = 2.8 GeV. For this purpose, we employ an effective Lagrangian approach in the tree-level Born approximation, and we employ various experimental and theoretical inputs. As a theoretical setup, the vectorlike Pomeron (C = +1) is taken into account as a parameterized two-gluon exchange contribution. We also consider f1(1285) axial-vector-meson, (π, η) pseudoscalarmeson, and (a0, f0) scalar-meson exchanges in the t channel, in addition to the experimentally confirmed nucleon resonances, such as N * (2000, 5/2 + ) and N * (2300, 1/2 + ), for the direct φ-meson radiations in the s and u channels. We provide numerical results for the total and differential cross sections as well as the spin-density matrices in the Gottfried-Jackson, Adair, and helicity frames. We observe that, together with the universally accepted pomeron contribution, the considered meson and nucleon-resonance contributions play significant roles in reproducing the experimental data for the forward and backward φ-meson scattering-angle regions, respectively, indicating the nontrivial interferences between mesonic and baryonic contributions.

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“…For photoproduction of vector mesons, T γp→ρ 0 p , the Regge model [2,7] which reproduces the world set of data in the entire angular range (see for instance section 2.4, and reference [9]) is used. The model takes into account the exchange of the Pomeron, the f 2 and σ mesons in the t-channel, as well as the exchange of the nucleon and the Delta in the u-channel.…”

Section: Inelastic Unitarity Cutsmentioning

confidence: 99%

“…The modeling [5] of the Pomeron in terms of two gluons provides a good description [2,6,7] of the photo-production cross section [8] at high −t. In addition the exchange of meson Regge trajectories are needed to account for the angular distributions in the photo-production of ρ and ω mesons [9,10].…”

Section: Introductionmentioning

confidence: 99%

Exclusive meson photo- and electro-production, a window on the structure of hadronic matter

Laget

2020

Progress in Particle and Nuclear Physics

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At high energy, exclusive meson photo-and electro-production give access to the structure of hadronic matter. At low momentum transfers, the exchange of a few Regge trajectories leads to a comprehensive account of the cross-sections. Among these trajectories, which are related to the mass spectrum of families of mesons, the Pomeron plays an interesting role as it is related to glue-ball excitations. At high momentum transfers, the exchange of these collective excitations is expected to reduce to the exchange of their simplest (quark or gluon) components. However, contribution from unitarity rescattering cuts are relevant even at high energies. In the JLab energy range, the asymptotic regime, where the players in the game are current quarks and massless gluons has not been reached yet. One has to rely on more effective degrees of freedom adapted to the scale of the probe. A consistent picture, the Partonic Non-Perturbative Regime, is emerging. The properties of its various components (dressed propagators, effective coupling constants, quark wave functions, shape of the Regge trajectories, etc..) provide us with various links to hadron properties. I will review the status of the field, will put in perspective the current achievements at JLab, SLAC and Hermes, and will assess future developments that are made possible by continuous electron beams at higher energies. The p(γ, φ)p reactionThis picture works best when the φ meson is emitted at the most forward angles (that drive the total cross section). At higher −t > 1 GeV 2 , the Pomeron exchange contribution falls down faster than the experimental data as can be seen in Figure 3. The data are better reproduced by modeling [5,6,2] the Pomeron in terms of the exchange of two gluons as depicted in Figure 4. When the two gluons couple to the same constituent quark in the nucleon (bottom part), the interference between their coupling to the same constituent quark or to different quarks in the φ meson induces a node in the cross section. This node disappears when the coupling to different correlated quarks in the nucleon is allowed (top part). The two gluon contribution matches the Pomeron contribution at the lowest −t, but provides more strength at high −t.It turns out that, in the high energy limit, the Pomeron and the two gluon amplitudes have the same functional form and the same structure at low −t. The treatment of the quark loop in the vector meson is the same in the two approaches. The Pomeron Regge pole drives the dynamics of its exchange. Since it is a perturbative-like calculation there is no Regge factor in the two gluon exchange amplitude:

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Photoproduction of theρ0Meson on the Proton at Large Momentum Transfer

Cited by 52 publications

References 26 publications

π+photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

π+photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

Pomeron, nucleon-resonance, and (0+,0−,1+) -meson contributions in ϕ -meson photoproduction

Exclusive meson photo- and electro-production, a window on the structure of hadronic matter

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