η meson production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>NN</mml:mi></mml:math>collisions

Nakayama, K.; Speth, J.; Lee, T. S. H.

doi:10.1103/physrevc.65.045210

Cited by 84 publications

(228 citation statements)

References 48 publications

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“…The elaborated angular dependence of the analyzing power agrees with previous results obtained by the COSY-11 experiment but disagrees with the theoretical predictions [23,24]. The analysis using the associated Legendre polynomials shows that S s S d and Pp Ps interference is not present for Q = 15 MeV.…”

Section: Resultssupporting

confidence: 73%

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

2016

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Abstract. High statistics measurements of the analyzing power for the pp → ppη reaction were performed with the WASA-at-COSY detector at the Cooler Synchrotron COSY. The η meson was produced at two excess energies: Q = 15 MeV and Q = 72 MeV, and it was registered using the missing and invariant mass techniques. The determined analyzing power is consistent with zero for Q = 15 MeV implying the dominance of s wave and an insignificant contribution of the S d partial wave. However, at Q = 72 MeV the angular distribution of the analyzing power reveals a strong interference of Ps and Pp partial waves. Moreover, the available theoretical predictions for the angular dependence of the analyzing power strongly deviate from our experimental results.

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Section: Resultssupporting

confidence: 73%

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

2016

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“…[12]. Although the data indicate some contribution from partial waves higher than the s-wave, they are not sufficiently accurate to make a definitive statement as to the size of their contribution.…”

mentioning

confidence: 83%

“…In Ref. [12] we have presented a relativistic meson-exchange model for η production in NN collisions. It treats η production in the Distorted Wave Born Approximation and includes both the NN FSI and initial state interaction (ISI), the latter through the approximate procedure proposed in Ref.…”

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confidence: 99%

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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“…This assumption is reasonable because there is no other resonance which gives a significant contribution near threshold [9]. In our model, σ exchange is also ignored since it was found that the σ exchange only plays a minor role for the excitation of N * (1535) in the reaction pp → ppη [11]. If our assumptions are correct, this reaction may be a good place to investigate the properties of N * (1535).…”

Section: K + N → Knη Near Thresholdmentioning

confidence: 99%

Nucleon resonance production in K+N interactions

Liu

2013

Nuclear Physics A

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In this work, we discuss the possibility of studying nucleon resonances in the K + N interactions. Based on our model calculations, it is found that the hyperon exchange plays an important role for the excitation of nucleon resonances in the K + N interactions. Therefore, the studies on nucleon resonance production in the K + N interactions can offer us valuable information about the couplings of nucleon resonances with strange particles. By selecting suitable decay channels of nucleon resonances, some reactions are also suitable to look for missing resonances.

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η meson production inNNcollisions

Cited by 84 publications

References 48 publications

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

Determination of the analysing power for the $\bar{p}p$ →ppηreaction using the WASA-at-COSY detector system

Analysis of the reactionpp→ppηnear threshold

Nucleon resonance production in K+N interactions

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