Regge signatures from CLAS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Λ</mml:mi><mml:mo>(</mml:mo><mml:mn>1520</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>photoproduction data at forward angles

Wang, En; Xie, Ju-Jun; Nieves, J.

doi:10.1103/physrevc.90.065203

Cited by 17 publications

(35 citation statements)

References 46 publications

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“…For this single-meson production process, it is argued that replacing the t-channel single-meson exchange (third diagram in Fig. 1) by the exchange of an entire Regge trajectory, would lead to a better, simpler description of the dynamics of the process in question, in particular, if it is dominated by small-momentum transfers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, the good success of such hybrid approaches notwithstanding, it is well known that this replacement destroys gauge invariance even if the underlying Feynman formulation was gauge invariant to start with.…”

Section: Introductionmentioning

confidence: 99%

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Preserving local gauge invariance witht-channel Regge exchange

Haberzettl

Wang

2015

Phys. Rev. C

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Considering single-meson photo-and electroproduction off a baryon, it is shown how to restore local gauge invariance that was broken by replacing standard Feynman-type meson exchange in the t-channel by exchange of a Regge trajectory. This is achieved by constructing a contact current whose four-divergence cancels the gauge-invariance-violating contributions resulting from all states above the base state on the Regge trajectory. To illustrate the procedure, modifications necessary for the process γ +p → K + +Σ * 0 are discussed in some detail. We also provide the general expression for the contact current for an arbitrary reaction.

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Section: Introductionmentioning

confidence: 99%

“…Even though the method is quite successful in providing good descriptions of data in many applications (see, for example, Refs. [5][6][7][11][12][13][14][15][16][17][18][19]), there is no dynamical foundation for it.…”

Section: Introductionmentioning

confidence: 99%

Preserving local gauge invariance witht-channel Regge exchange

Haberzettl

Wang

2015

Phys. Rev. C

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“…Therefore, in modeling the reaction amplitude for the γp → f 1 (1285)p reaction at high energies, instead of considering the exchange of a finite selection of individual particles, the exchange of entire Regge trajectories is taken into account, and this exchange can take place in the t-channel ρ and ω trajectories [18].…”

Section: B ρ and ω Trajectories Contributionsmentioning

confidence: 99%

Study on the reaction of γp→f1(1285)p in Regge-effective Lagrangian approach

et al. 2017

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The production of the f1(1285) resonance in the reaction of γp → f1(1285)p is investigated within a Regge-effective Lagrangian approach. Besides the contributions of the t-channel ρ and ω trajectories exchanges, we also take into account the contributions of s/u-channel N (2300) terms, s/u-channel nucleon terms, and the contact term. By fitting to the CLAS data, we find that the s-channel N (2300) term plays an important role in this reaction. We predict the total cross section for this reaction, and find a clear bump structure around W = 2.3 GeV, which is associated with the N (2300) state. The reaction of γp → f1(1285)p could be useful to further study of the N (2300) experimentally.PACS numbers: 13.60. Le, 14.20.Gk, 11.10.Ef I. INTRODUCTIONIt has been known that the nucleon is a bound state of three valence quarks since 1970s. Many nucleon resonances, referred as N * , have been observed [1], the properties of nucleon resonances are the important issues in hadron physics, and attract lots of attentions [2][3][4]. For the nucleon resonances with masses below 2 GeV, their properties have been widely investigated in literature. However, the current knowledge on the properties of excited nucleon states with masses above 2 GeV is scarce. On the other hand, many missing N * s, predicted by the constituent quark models are not yet found [5].Recently, the CLAS Collaboration has measured the f 1 (1285) meson for the first time in photoproduction from a proton target, and presented the f 1 (1285) differential photoproduction cross section into ηπ + π − final states from the threshold up to a center-of-mass (c.m.) energy of W = 2.8 GeV [6]. A cross section comparison for γp → η ′ (958)p → ηπ + π − p and γp → f 1 (1285)p → ηπ + π − p at W = 2.55 GeV in Fig. 10 of Ref. [6] shows that the η ′ (958) cross section exhibits much stronger tand u-channel signatures in the angle dependence than dose the one of f 1 (1285), which is quite flat. This may imply that the f 1 (1285) photoproduction mechanism is not dominated alone by t-channel production processes.Before the experimental study on γp → f 1 (1285)p [6], there are several theoretical works on this reaction. Within the Regge-model, considering the exchanges of t-channel ρ and ω trajectories, Kochelev et al. calculated the differential cross sections of γp → f 1 (1285)p [7]. Comparison of the Regge-model calculations and the CLAS data shows the t-channel production process alone does not reproduce the CLAS measurements.

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“…It seems reasonable, therefore, to consider mechanisms for smooth transitions into that regime that can be fine-tuned to the requirements of particular applications [8,[11][12][13][29][30][31][32]. Fitting the parameters of such an interpolation scheme to experimental data lets the data 'decide' whether Regge exchanges should be necessary or not for a particular process at a particular photon energy.…”

Section: B Interpolating Reggeized T-channel Form Factormentioning

confidence: 99%

“…To this end we adopt here an effective Lagrangian approach in terms of standard s-, u-, and t-channel exchanges, similar to the studies of Λ(1520) and Σ (1385) photoproductions off the proton [6][7][8][11][12][13]. At high energies, however, a more economical approach may be furnished by a phenomenological Regge treatment [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of recent CLAS data onΣ*(1385) photoproduction off a neutron target

Wang

Haberzettl

2016

Phys. Rev. C

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Based on recent experimental data obtained by the CLAS Collaboration, the Σ(1385) photoproduction off a neutron target at laboratory photon energies Eγ up to 2.5 GeV is investigated in an effective Lagrangian approach including s-, u-, and t-channel Born-term contributions. The present calculation does not take into account any explicit s-channel baryon-resonance contributions, however, in the spirit of duality, we include t-channel exchanges of mesonic Regge trajectories. The onset of the Regge regime is controlled by smoothly interpolating between Feynman-type singlemeson exchanges and full-fledged Regge-trajectory exchanges. Gauge invariance broken by the Regge treatment is fully restored by introducing contact-type interaction currents that result from the implementation of local gauge invariance in terms of generalized Ward-Takahashi identities. The cross sections for the γn → K + Σ * (1385) − reaction are calculated and compared with experimental results from the CLAS and LEPS collaborations. Despite its simplicity, the present theoretical approach provides a good description of the main features of the data. However, the parameters fitted to the data show that the gauge-invariance-restoring contact term plays a large role which may point to large contributions from final-state interactions.

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Regge signatures from CLASΛ(1520)photoproduction data at forward angles

Cited by 17 publications

References 46 publications

Preserving local gauge invariance witht-channel Regge exchange

Preserving local gauge invariance witht-channel Regge exchange

Study on the reaction of γp→f1(1285)p in Regge-effective Lagrangian approach

Analysis of recent CLAS data onΣ*(1385) photoproduction off a neutron target

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