Pseudoscalar-versus-pseudovector interactions in photo- and electroproduction of charged mesons

Deo, B. B.; Bisoi, Ajay Kumar

doi:10.1103/physrevd.9.288

Cited by 24 publications

(8 citation statements)

References 18 publications

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“…where q K is the momentum of the kaon leaving the vertex and the pseudovector coupling constant g PV KΛN is related to the pseudoscalar one through g [33]. To maintain gauge invariance, the so-called contact (seagull) term shown in Fig.…”

Section: Pseudovector Couplingmentioning

confidence: 99%

Electromagnetic production of kaons near threshold

Mart

2010

Phys. Rev. C

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Kaon photo-and electroproduction off a proton near the production threshold are investigated by utilizing an isobar model. The background amplitude of the model is constructed from Feynman diagrams, whereas the resonance term is calculated by using the multipole formalism. It is found that both pseudoscalar and pseudovector models can nicely describe the available photoproduction data up to W = 50 MeV above the threshold. The Λ resonance S 01 (1800) is found to play an important role in improving the model. In the case of double polarization observables O x and O z our result corroborates the finding of Sandorfi et al. Due to the large contributions of the K * and K 1 vector mesons, extending the model to the case of electroproduction is almost impossible unless either special form factors that strongly suppress their contributions are introduced or all hadronic coupling constants are refitted to both photo-and electroproduction databases, simultaneously. It is also concluded that investigation of the kaon electromagnetic form factor is not recommended near the threshold region.

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Section: Pseudovector Couplingmentioning

confidence: 99%

Electromagnetic production of kaons near threshold

Mart

2010

Phys. Rev. C

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“…In this work we have utilized the Fubini-Nambu-Wataghin term [14] to restore gauge invariance, which is discussed in Ref. [15]. Since the term is very specific and not trivial, we expect that different methods of restoring gauge invariance in this process will not affect the result shown in this work.…”

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confidence: 99%

Photo- and electroproduction ofK0Λnear threshold and effects of theK0electromagnetic form factor

Mart

2011

Phys. Rev. C

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By extending our previous isobar model to the K 0 isospin channel, we investigate the properties of the K 0 photo-and electroproduction at energies near threshold. It is found that the pseudovector coupling yields significantly larger cross sections. Variation of the K 1 coupling constants has significant effect only on the pseudovector model. The electromagnetic form factor of the neutral kaon K 0 is found to have a sizable effect on the longitudinal cross section of the K 0 electroproduction near the threshold.Recently there has been great interest in the electromagnetic production of the neutral kaon [1,2]. There are several motivations behind this interest, one of them being the search for missing resonances. In the K 0 photoproduction the t-channel K 0 intermediate state does not present due to the lack of interaction between real photons and neutral mesons. The absence of this channel might have a strong impact on the angular distribution of the predicted observables and also increase the dominance of the nucleon resonance contribution. This situation is obviously different in the leading K + [3,4] and K + 0 [5] channels, which for years have become the main source of information on the strangeness production process. Another motivation comes from the deuteron sector, in which the relevant processes are γ + d → K 0 + + p and γ + d → K 0 + 0 + p. Due to the lack of the neutron target, the two processes are expected to be the natural avenue in the investigation of kaon photoproduction on the neutron. A recent report shows that the extraction of the elementary cross section is possible for these processes in the quasifree scattering region, where the final state interaction effects are negligible [1]. Note that the result of such an analysis relies on the results of the Kaon-Maid model [6], especially on the K 0 channel. However, the predicted total cross section of this channel is found to be twice larger than that of the K + channel, in contrast to the case of the other four related isospin channels (see Fig. 1 of Ref. [1]).There was an attempt to investigate the effect of the K 0 charge form factor on the K 0 electroproduction [7]. Although significant effects on the longitudinal cross section were observed, the result was found to be very model dependent. Consequently, a reliable phenomenological model becomes the important prescription for this purpose. Since a reliable model should not depend on too many uncertain free parameters, it is obviously important to limit the energy of interest very close to the production threshold.Very recently, we have analyzed photo-and electroproduction of the K + final state at energies near its production threshold by utilizing an isobar model [8]. Using the pseudoscalar (PS) coupling the model can nicely describe experimental data both in the real and virtual photon sectors up to total c.m. energy W = 50 MeV above the threshold. By using pseudovector (PV) coupling, agreement with the

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“…where s and t are the usual Mandelstam variables and k 2 denotes the virtual photon momentum squared. The gauge and Lorentz invariant matrices M j are given in many references [1,5,6,11,12], while the amplitudes A j can be obtained from Feynman diagrams. For the photoproduction reactions only the amplitudes A 1 − A 4 contribute.…”

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confidence: 99%