A measurement of the η radiative width Γη→γγ

Bartel, W.; Becker, L.; Cords, D.; Felst, R.; Haidt, D.; Junge, H.; Knies, G.; Krehbiel, H.; Laurikainen, P.; Meinke, R.; Naroska, B.; Olsson, J. E.; Schmidt, D.; Steffen, D.; Dietrich, G.; Hagemann, J.; Heinzelmann, G.; Kado, H.; Kawagoe, K.; Kuhlen, M.; Meier, K.; Petersen, A.; Ramcke, R.; Schneekloth, U.; Weber, G.; Ambrus, K.; Bethke, S.; Dieckmann, A.; Elsen, E.; Heintze, J.; Hellenbrand, K. H.; Komamiya, S.; Krogh, J. von; Lennert, P.; Matsumura, H.; Rieseberg, H.; Spitzer, J.; Wagner, A.; Bowdery, C.; Finch, A.; Foster, F.; Hughes, G.; Nozaki, T.; Nye, J. M.; Allison, J.; Baines, J. T.; Ball, A. H.; Barlow, R. J.; Chrin, J.; Duerdoth, I. P.; Greenshaw, T.; Hill, P.; Loebinger, F. K.; Macbeth, A. A.; McCann, H.; Mills, H. E.; Murphy, P. G.; Stephens, K.; Warming, P.; Glasser, R. G.; Sechi-Zorn, B.; Skard, J. A.; Wagner, S. R.; Zorn, G. T.; Cartwright, S. L.; Clarke, D.; Marshall, R.; Middleton, R. P.; Whittaker, J. B.; Kawamoto, T.; Kobayashi, Takumi; Mäshimo, T.; Minowa, M.; Takeda, Hiroshi; Takeshita, T.; Yamada, Shoichi

doi:10.1016/0370-2693(85)90013-9

Cited by 22 publications

(12 citation statements)

References 28 publications

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“…Since this variation introduces an [17][18][19][20] that participate to the PDG average (solid red line) of 0.510 (26) keV [25] and via the Primakoff method at Cornell [23] almost isotropic effect, the corresponding systematic error is vanishing small both for the simultaneous (<0.2%) and single (<0.1%) fits.…”

Section: Extracting the η → γ γ Decay Width Via The Primakoff Methodmentioning

confidence: 99%

“…Such value is much lower than the statistical uncertainties for the combined (13%) and single (17.6%) fits and one order of magnitude lower than the discrepancy between Cornell and collider measurements (∼50%). Figure 25(a) presents some of the experimental results for the η → γ γ decay width obtained in collider experiments [17][18][19][20] (squares) and via the Primakoff method at Cornell [23] (circle). The PDG average of 0.510(26) keV [25] is shown by the solid red line.…”

Section: Extracting the η → γ γ Decay Width Via The Primakoff Methodmentioning

confidence: 99%

“…The η → γ γ decay width has been measured in collider experiments [17][18][19][20][21][22] and also using the Primakoff method at Cornell [23]. There is also another Primakoff-type experiment [24], but the uncertainty from the separation of the Coulomb and nuclear contributions was probably underestimated.…”

Section: Introductionmentioning

confidence: 99%

“…The factorization presented in (20) does not hold if we take into account the distortion effects of the incident electron and outgoing proton and electron. In spite of this, one can still define the reduced cross section ρ ee p (p m ) by the ratio between the measured cross section and the electron-proton cross section:…”

mentioning

confidence: 99%

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Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Rodrigues¹,

Arruda‐Neto²,

Mesa³

et al. 2010

Phys. Rev. C

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The mechanism of incoherent π 0 and η photoproduction from complex nuclei is investigated from 4 to 12 GeV with an extended version of the multicollisional Monte Carlo (MCMC) intranuclear cascade model. The calculations take into account the elementary photoproduction amplitudes via a Regge model and the nuclear effects of photon shadowing, Pauli blocking, and meson-nucleus final-state interactions. The results for π 0 photoproduction reproduced for the first time the magnitude and energy dependence of the measured rations σ γ A /σ γ N for several nuclei (Be, C, Al, Cu, Ag, and Pb) from a Cornell experiment. The results for η photoproduction fitted the inelastic background in Cornell's yields remarkably well, which is clearly not isotropic as previously considered in Cornell's analysis. With this constraint for the background, the η → γ γ decay width was extracted using the Primakoff method, combining Be and Cu data [ η→γ γ = 0.476 (62)

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Section: Extracting the η → γ γ Decay Width Via The Primakoff Methodmentioning

confidence: 99%

Section: Extracting the η → γ γ Decay Width Via The Primakoff Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Rodrigues¹,

Arruda‐Neto²,

Mesa³

et al. 2010

Phys. Rev. C

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“…The goal of this experiment is to measure the η radiative decay width to a ∼ 3% precision via the Primakoff effect on two light targets, hydrogen and 4 He, using the newly developed GlueX apparatus in Hall D. The previous measurements were performed using two photon interactions either through e + e − collisions (e + e − → γ * γ * e + e − → ηe + e − ) [20][21][22][23][24] or via the Primakoff effect [25]. There is a significant difference (at the 3σ level) between these two types of measurements.…”

Section: Primakoff Experiments At Jlab 12 Gevmentioning

confidence: 99%

Test Fundamental Symmetries via Precision Measurements of \(\pi ^{0}\), \(\eta \), and \(\eta '\) Decays

Gan

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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Light neutral meson decays provide a unique laboratory to test fundamental symmetries in physics. A comprehensive Primakoff experimental program at Jefferson Laboratory (JLab) is aimed at gathering high precision measurements on the two-photon decay widths and the transition form factors at low four-momentum transfer squares for π 0 , η and η ′ via the Primakoff effect. The results of these measurements will offer stringent tests on the chiral anomaly and provide sensitive probe for the origin and dynamics of chiral symmetry breaking in the confinement QCD. In addition, the JLab Eta Factory (JEF) experiment has been recently developed to measure various η decays with emphasis on rare neutral modes. It will have a factor of two orders of magnitude reduction in backgrounds compared to all other existing or planned experiments in the world. Such low background data will serve as important hadronic probes for weakly-coupled new forces, such as a dark force via a leptophobic dark V B -boson or a new C-violating, P-conserving force. The status of these experimental activities and their physics impacts will be discussed.

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Gluonium content in ? and ?? mesons fromJ/? decays

Bramón

Casulleras

1986

Z. Phys. C - Particles and Fields

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A measurement of the η radiative width Γη→γγ

Cited by 22 publications

References 28 publications

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Test Fundamental Symmetries via Precision Measurements of \(\pi ^{0}\), \(\eta \), and \(\eta '\) Decays

Gluonium content in ? and ?? mesons fromJ/? decays

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