Estimate ofd?- production in protonproton collisions

Schepkin, M.; Zaboronsky, O.; Clement, H.

doi:10.1007/bf01282902

Cited by 27 publications

(23 citation statements)

References 13 publications

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“…On the 3s level the new data, which comprise an order of magnitude better statistics, provide no evidence for narrow pNN resonances and give an upper limit of about 20 nb for their production cross section in this reaction. This limit is 2 orders of magnitude below the previous prediction [17]. Before discussing in detail the features emerging from the measurement of the differential cross sections, we shortly review the possible reaction mechanisms of the p 1 p 2 production process.…”

mentioning

confidence: 86%

Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Brodowski

Bilger²,

Calén³

et al. 2002

Phys. Rev. Lett.

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The pp-->pp pi(+) pi(-) reaction has been measured exclusively near threshold at CELSIUS. The total cross sections are nearly an order of magnitude lower than expected from previous inclusive measurements. The differential cross sections reveal pp-->pp(*)(1440)-->pp sigma = pp(pi(+)pi(-))(I = l = 0) as the dominant process as well as significant contributions from p(*)-->Delta(++)pi(-)-->psigma. The observed anisotropy in the proton angular dependence is consistent with heavy-meson exchange. In the invariant mass spectra, no narrow structures of statistical relevance (3sigma) are found.

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confidence: 86%

Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Brodowski

Bilger²,

Calén³

et al. 2002

Phys. Rev. Lett.

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“…[17] for the FSI we arrive at a value of G spread ഠ 7 MeV from pion exchange, if the surrounding medium has nuclear matter density. Assuming s and p coupling constants are equal on the quark level, we obtain a spreading contribution from s exchange comparable to that from p exchange.…”

mentioning

confidence: 87%

“…3N process may be estimated from virtual pion and sigma exchange of the d 0 with a nucleon in the surrounding medium. Starting with the Lorentz invariant amplitude of the d 0 decay in vacuum [17] A d 0 !NNp f 2m u 1 Cg 5 ͑it 2 t͒u 2 p, where u 1,2 are bispinors, C g 2 g 0 , m denotes the nucleon mass, and f 2 ഠ …”

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confidence: 99%

Pionic Double Charge Exchange onN=ZDoubly Closed Shell Nuclei

et al. 1997

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The ͑p 1 , p 2 ͒ reaction on the isoscalar, doubly magic nuclei 16 O and 40 Ca has been measured in the energy range T p 45 90 MeV. The forward angle cross sections of the ground state transitions (GST) show a very pronounced resonancelike energy dependence. The observed energy and angle dependences are well described by the recent hypothesis of the formation of a pNN resonance in the course of the double charge exchange process. The deduced spreading widths are in accordance with estimates of the d 0 collision damping in the nuclear medium. In the reaction on 16 O in addition to the GST the transition to a 0 1 state at E x 2.1͑2͒ MeV in 16 Ne has been observed, which is interpreted as the quadruple isobaric analog state (QIAS) of the 0 1 2 state in 16 C at E x 3.03 MeV. [S0031-9007 (97)04511-0]

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“…In this work the resonance contribution to the np → npπ 0 π 0 reaction was calculated in analogy to that for the np → dπ 0 π 0 reaction, only that three-body phasespace is replaced by a four-body phase space and the condition for the momenta of the emitted nucleons to be in accord with the deuteron wave function is replaced by the requirement that the emerging np pair undergoes a final-state interaction chosen to be of Migdal-Watson type [49][50][51]:…”

Section: Description Of the D * (2380) Resonance Processmentioning

confidence: 99%

“…[13,56] the ∆∆-FSI was parameterized in the Migdal-Watson ansatz [49][50][51] providing the factoranalogous to eq. (17) -…”

Section: ∆∆ Final State Interactionmentioning

confidence: 99%

Examination of the nature of the ABC effect

2017

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Recently it has been shown by exclusive and kinematically complete experiments that the appearance of a narrow resonance structure in double-pionic fusion reactions is strictly correlated with the appearance of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the ππ-invariant mass spectrum. Whereas the resonance structure got its explanation by the d * (2380) dibaryonic resonance, a satisfactory explanation for the ABC effect is still pending. In this paper we discuss possible explanations of the ABC effect and their consequences for the internal structure of the d * dibaryon. To this end we examine and review a variety of proposed explanations for the ABC effect, add a new hypothesis and confront all of them with the experimental results for the np → dπ 0 π 0 and np → npπ 0 π 0 reactions, which are the most challenging ones for this topic.

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Estimate ofd?- production in protonproton collisions

Cited by 27 publications

References 13 publications

Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Pionic Double Charge Exchange onN=ZDoubly Closed Shell Nuclei

Examination of the nature of the ABC effect

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