The η-meson mass

Plouin, F.; Fleury, P.; Bachelier, D.; Beurtey, R.; Boivin, M.; Boyard, J. L.; Briscoe, W. J.; Hennino, T.; Keßler, R.; Mayer, B.; Milleret, G.; Moalem, A.; Nakach, A.; Nefkens, B. M. K.; Pillai, C.; Whitten, C.; Wilkin, C.

doi:10.1016/0370-2693(92)91678-3

Cited by 31 publications

(26 citation statements)

References 5 publications

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“…Incident proton energies measured by this method were slightly lower than nominal ones calculated using the parameters of the Saturne machine, with a mean difference of ∆T = T nominal − T measured = 1.1 ± 0.8 MeV. This offset is consistent with previous measurements [6,8,9] and we adopt it as a standard energy shift.…”

supporting

confidence: 86%

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Near-Threshold Production ofωMesons in thepp→ppωReaction

et al. 1999

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The total cross section for ω production in the pp → ppω reaction has been measured at five c.m. excess energies from 3.8 to 30 MeV. The energy dependence is easily understood in terms of a strong protonproton final state interaction combined with a smearing over the width of the state. The ratio of near-threshold φ and ω production is consistent with the predictions of a one-pion-exchange model and the degree of violation of the OZI rule is similar to that found in the π − p → nω/φ reactions.

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supporting

confidence: 86%

“…For near-threshold meson production, it is important to verify the values of T p or Q by independent means [6,8,9]. In one approach, we used the pp → dπ + and pp → pπ + n reactions to carry out simultaneously very accurate calibrations of the mean field of the spectrometer and measurements of the incident proton energy at each nominal energy.…”

mentioning

confidence: 99%

Near-Threshold Production ofωMesons in thepp→ppωReaction

et al. 1999

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“…However, in the two cases where the beam energy was determined through the measurement of other two-body reactions that fell within the spectrometer acceptances [267,268], the values obtained for the mass were about 0.5 MeV/c 2 lower than the current PDG average [23].…”

Section: The η-Meson Massmentioning

confidence: 99%

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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“…Though significantly smaller than that reported in the NA48 experiment [9], it is in excellent agreement with the other results. The results of the η-mass measurements, in order of publication date, taken from the Rutherford Laboratory (RL) [11], SATURNE [12], MAMI [13], NA48 [9], and GEM [10]. When two error bars are shown, the smaller is statistical and the larger total.…”

Section: A Precision Measurement Of the η Massmentioning

confidence: 99%

“…Here we will concentrate on the decay into three neutral pions. The amplitude can be written as A(η → 3π 0 ) 2 = 1 + 2αz (12) with z = ρ 2 /ρ 2 max the relative radial distance. The distance to the center of the Dalitz plot is ρ.…”

Section: η and η ′ Decaysmentioning

confidence: 99%