Production of η mesons in nucleon-nucleon collisions

Baru, V.; Gasparyan, A. M.; Haidenbauer, J.; Hanhart, C.; Kudryavtsev, A. E.; Speth, J.

doi:10.1103/physrevc.67.024002

Cited by 51 publications

(66 citation statements)

References 54 publications

(119 reference statements)

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“…The annihilation rate for the isospin-scalarNN is empirically found to be bigger than the isospin-vector by a factor about 1.7 [24]. The different annihilation rates will cause different ISI reduction factors [25,26]. This effect is not taken into account in our model calculation.…”

Section: Figurementioning

confidence: 96%

“…The final state interactions (FSI) may also cause smooth energy-dependent modifications to the total cross sections [27]. Although the ISI and FSI could be taken into account by some more complicated approaches [25][26][27], they are still of some model dependence. Since in this work we mainly investigate the relative importance of various resonance contributions, we have not included complicated treatments of ISI and FSI which are not expected to influence our main conclusions.…”

Section: Figurementioning

confidence: 99%

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Phenomenological study on the reactions

Cao

Zou

2011

Nuclear Physics A

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Section: Figurementioning

confidence: 96%

Section: Figurementioning

confidence: 99%

Phenomenological study on the reactions

Cao

Zou

2011

Nuclear Physics A

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“…Indeed, an enhancement and/or a strong energy dependence of nearthreshold cross sections has been seen in many other reactions involving hadrons and is commonly seen as to be caused by FSI effects, cf. [33][34][35][36][37][38][39]. Thus, it is plausible and it even has to be expected that FSI effects play a role in the decay J/Ψ→γpp as well.…”

Section: J/ψ Decay Rate and Fsi Effectsmentioning

confidence: 99%

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

et al. 2005

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We investigate the nature of the near-threshold enhancement in the pp invariant mass spectrum of the reaction J/Ψ→γpp reported recently by the BES Collaboration. Using the Jülich NN model we show that the mass dependence of the pp spectrum close to the threshold can be reproduced by the S-wave pp final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NN interaction near threshold and of the J/Ψ→γpp reaction mechanism and in view of the controversal situation in the decay J/Ψ→π 0 pp, where no obvious signs of a pp final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

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“…E.g., the model developed by V. Baru et al [18] reproduces nicely the energy dependence of the total cross section from threshold up to Q ∼ 50 MeV with S-wave contributions alone. Results of the present model for the total cross section are shown in Fig.…”

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Analysis of the reactionpp→ppηnear threshold

et al. 2003

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It is shown that most of the available data on the pp → ppη reaction, including the invariant mass distributions in the pp → ppη reaction recently measured at COSY, can be understood in terms of the partial-wave amplitudes involving final pp S and P states and the η meson s-wave.This finding, together with the fact that results within a meson-exchange model are especially sensitive to the details of the excitation mechanism of the S 11 (1535) resonance, demonstrates the possibility of investigating the properties of this resonance in N N collisions. The spin correlation function C xx is shown to disentangle the S-and P -wave contributions. It is also argued that spin correlations may be used to help constrain the contributions of the amplitudes corresponding to the final pp 3 P 0 and 3 P 2 states. PACS numbers: PACS: 25.10.+s, 1 The primary motivations for studying the production of mesons off nucleons and nuclei are to investigate the structure and properties of the nucleon resonances and to learn about hadron dynamics at short range. As far as hadron-induced reactions are concerned, and specifically nucleon-nucleon (NN) collisions, there is already a wealth of information on the production of the lightest meson, the pion. In particular, there now exists a fairly accurate and complete set of data, especially for π o production in the near-threshold energy region [1], which should allow for a partial wave analysis. The η meson, which is the next lightest non-strange meson in the meson mass spectrum, has also been the subject of considerable interest. A peculiar feature of this meson is that it couples strongly to the S 11 (1535) nucleon resonance, which offers a unique opportunity for investigating the properties of this resonance. Unfortunately, the experimental information on η production in NN collisions [2,3,4,5,6,7] is much less complete than for pion production and is not yet sufficient for a model-independent partial-wave analysis. However, the available data base has greatly expanded recently thanks to measurements by the TOF and COSY-11collaborations at COSY [6,7] that provided, not only η and proton angular distributions, but also pp and pη invariant mass distributions for the reaction pp → ppη. These new data, together with the earlier measurements [2,3,4], open the possibility for investigating this reaction in much more detail than could be done previously.A general feature of meson production in NN collisions is that the energy dependence of the total cross section in the near-threshold region is basically dictated by the available phase space plus the NN final state interaction (FSI) in S states. The effect of the strong NN FSI also shows up in the corresponding NN invariant mass spectrum as a peak close to the threshold value of the invariant mass, m N N = 2m N , where m N denotes the nucleon mass. Surprisingly, the recently measured pp invariant mass distribution in the reaction pp → ppη [6,7] at excess energies of Q = 15 and 41 MeV shows, in addition to a peak very close to the threshol...

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Production of η mesons in nucleon-nucleon collisions

Cited by 51 publications

References 54 publications

Phenomenological study on the reactions

Phenomenological study on the reactions

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

Analysis of the reactionpp→ppηnear threshold

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