The absorption model and production of 2 mesons

Høgaasen, H.; Högaasen, J.; Keyser, R.M.C. De; Svensson, Bengt E Y

doi:10.1007/bf02717923

Cited by 40 publications

(5 citation statements)

References 27 publications

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“…With suitable replacements we recover the known result for the width of the decay a 2 → πγ [10]. For the decay into e + e − the polarization vector ǫ µ of the photon has to be replaced by the lepton-current eū(e − )γ µ u(e + ).…”

Section: The Central Values Of the Branching Ratios For Dsupporting

confidence: 64%

Determining the quantum numbers of excited heavy mesons

Eilam

Krauss

2000

Physics Letters B

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We discuss the decays X * → Xe + e − ("Dalitz decays") of excited heavy mesons into their ground states and an electron-positron pair. We argue that the measurement of the invariant mass spectrum of the lepton pair gives clear indication on the quantum numbers of the excited meson and thus provides an experimental test of the quark model predictions.PACS numbers: 14.40. Lb, 14.40.Nd, 12.39.Jh, 13.40Hq, 13.20Fc, 13.20.He, 13.25.Ft, 13.25.Hw We investigate radiative decays of excited heavy mesons with charm and beauty, i.e. D * 0 , D * + s , B * 0 and B * 0 s , into their ground state plus an electronpositron pair. There are several reasons that led us to investigate these decays:1. The quantum numbers J and P of the excited mesons given in the Review of Particle Physics [1] are either merely predictions of the quark model, which gives for the particles discussed here J P = 1 − , or at best the quantum numbers need confirmation 1 .2. The quantum numbers of some even higher heavy meson states, depend on the correct assignments for the X * 's which are the focus of the present work. . Although the current errors on the individual branching ratios are clearly higher than the branching ratios for the decay into a Dalitz pair which, as we will see below, are of the 1 We would like to mention here, that for the B-meson even the quantum numbers of the ground state are not known experimentally; nevertheless we assume J P (B) = 0 − .

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Section: The Central Values Of the Branching Ratios For Dsupporting

confidence: 64%

Determining the quantum numbers of excited heavy mesons

Eilam

Krauss

2000

Physics Letters B

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“…In the past, the a 2 (1320) (≡ a 2 ) photoproduction was extensively studied. The estimation of the exclusive photoproduction cross section for a 2 has been performed according to the one-pion exchange (OPE) mechanism with absorption in [23]. The experimental results for the values and energy dependence of this cross section at relatively low (<20 GeV) energies are quite consistent with the prediction of this model [52].…”

Section: Introductionsupporting

confidence: 54%

Photoproduction ofa2(1320)in a Regge model

Wang

Guskov

2016

Phys. Rev. D

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In this work, the photoproduction of a2(1320) off a proton target is investigated within an effective Lagrangian approach and the Regge model. The theoretical result indicates that the shapes of the total and differential cross sections of the γp → a + 2 n reaction within the Feynman (isobar) model are much different from that of the Reggeized treatment. The obtained cross section is compared with the existing experimental results at low energies. The a2(1320) production cross section at high energies can be tested by the COMPASS experiment, which can provide important information for clarifying the role of the Reggeized treatment at that energy range.

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“…This can be done by using the following interaction Lagrangian [197] which defines the a 2 γπ coupling,…”

Section: Charged Tensor Meson Photoproductionmentioning

confidence: 99%

“…We first calculate the charged tensor meson photoproduction, γp → a + 2 (1320)n to explore the one-pion exchange model. This can be done by using the following interaction Lagrangian [197] which defines the a 2 γπ coupling,…”

Section: Charged Tensor Meson Photoproductionmentioning

confidence: 99%

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Pentaquark Θ+(1540) production in γN→KK¯N reactions

Nakayama

Lee

2006

Physics Reports

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The recent developments in the search of exotic pentaquark hadrons are briefly reviewed. We then focus on investigating how the exotic pentaquark Θ(1540) baryon production can be identified in the γN → KKN reactions, focusing on the influence of the background (non-Θ production) mechanisms. By imposing the SU(3) symmetry and using various quark model predictions, we are able to fix the coupling constants for evaluating the kaon backgrounds, the KK production through the intermediate vector meson and tensor meson photoproduction, and the mechanisms involving intermediate Λ (1116), Λ(1405), Λ(1520), Σ(1193), Σ(1385), and ∆(1232) states. The vector meson photoproduction part is calculated from a phenomenological model which describes well the experimental data at low energies. We point out that the neutral tensor meson production can not be due to π 0 -exchange as done by Dzierba et al. [Phys. Rev. D 69, 051901 (2004)] because of C parity. The neutral tensor meson production is estimated by considering the vector meson exchange and found to be too weak to generate any peak at the position near Θ(1540). For Θ(1540) production, we assume that it is an isoscalar and hence can only be produced in γn → K + K − n and γp → K 0 K 0 p reactions, but not in γp → K + K − p and γn → K 0 K 0 n. The total cross section data of γp → K + K − p is thus used to fix the form factors which regularize the background amplitudes so that the signal of Θ(1540) in γn → K + K − n and γp → K 0 K 0 p cross sections can be predicted.We find that the predicted K + K − and K + n invariant mass distributions of the γn → K + K − n reaction can qualitatively reproduce the shapes of the JLab data. However, the predicted Θ(1540) peak can not be identified unambiguously with the data. High statistics experiments are needed to resolve the problem. We also find that an even-parity Θ is more likely to be detected, while it will be difficult to identify an odd-parity Θ, even if it exists, from the background continuum, if its coupling constants are small as in the present quark model predictions.

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The absorption model and production of 2 mesons

Cited by 40 publications

References 27 publications

Determining the quantum numbers of excited heavy mesons

Determining the quantum numbers of excited heavy mesons

Photoproduction ofa2(1320)in a Regge model

Pentaquark Θ+(1540) production in γN→KK¯N reactions

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