Measurement of the induced pseudoscalar coupling using radiative muon capture on hydrogen

Blecher, M.; Ahmad, S.; Armstrong, D. S.; Azuelos, G.; Bertl, W.; Chen, C. Q.; Depommier, P.; Egidy, T. von; Gorringe, T. P.; Gumplinger, P.; Hasinoff, M.; Henderson, R.; Jonkmans, G.; Larabee, A. J.; Macdonald, J. A.; McDonald, S.; Poutissou, J. M.; Poutissou, R.; Robertson, B.C.; Sample, D. G.; Schott, W.; Taylor, G. N.; Wright, D. H.; Zhang, N. S.

doi:10.1103/physrevc.57.373

Cited by 59 publications

(89 citation statements)

References 44 publications

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“…III, we use the new πN ∆ and γN ∆ couplings to calculate the ∆ excitation contribution to the photon spectrum for the reaction (1.1). We show for the recently measured spectrum [9,10] that it is suppressed in comparison with the one obtained earlier with the use of the traditional couplings. In Sect.…”

Section: Introductionmentioning

confidence: 76%

“…[6]. It was concluded in [3], where the study was made both within the small scale expansion scheme [7] and in the heavy baryon chiral perturbation theory [8], that a combination of various small effects could explain the experimental spectrum [9,10]. However, actual size of some of these effects such as of the charge symmetry breaking, are to be considered in a more detail.…”

Section: Introductionmentioning

confidence: 99%

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Gauge symmetric Δ(1232) couplings and the radiative muon capture in hydrogen

Smejkal

Truhlík

2005

Phys. Rev. C

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Using the difference between the gauge symmetric and standard πN ∆ couplings, a contact ππN N term, quadratic in the πN ∆ coupling, is explicitly constructed. Besides, a contribution from the ∆ excitation mechanism to the photon spectrum for the radiative muon capture in hydrogen is derived from the gauge symmetric πN ∆ and γN ∆ couplings. It is shown for the photon spectrum, studied recently experimentally, that the new spectrum is for the photon momentums k ≥ 60 MeV by 4-10 % smaller than the one obtained from standardly used couplings with the on-shell ∆'s.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Gauge symmetric Δ(1232) couplings and the radiative muon capture in hydrogen

Smejkal

Truhlík

2005

Phys. Rev. C

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“…The RMC detector is a photon-pair spectrometer with large solid angle coverage and moderate energy resolution. The detector was developed for studies of radiative muon capture on hydrogen and nuclei, and has been discussed elsewhere [34,35].…”

Section: Methodsmentioning

confidence: 99%

“…The factors F = 0.90 ± 0.09 for hydrogen and F = 0.96 ± 0.06 for deuterium account for small differences between the measured and the calculated acceptances due to various detector efficiencies, etc. The factor c stop = 0.85 ± 0.01 accounts for the fraction of incident pions stopping in liquid hydrogen or liquid deuterium and was computed via a Monte Carlo simulation [34]. The factor c bm = 0.98 for hydrogen and c bm = 0.91 for deuterium accounts for efficiencies of events surviving the beam telescope amplitude and C-counter timing cuts that are omitted from the simulation (the uncertainties in c bm are negligible).…”

Section: A Branching Ratios For Hydrogen and Deuteriummentioning

confidence: 99%

Double radiative pion capture on hydrogen and deuterium and the nucleon's pion cloud

et al. 2007

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We report measurements of double radiative capture in pionic hydrogen and pionic deuterium. The measurements were performed with the RMC spectrometer at the TRIUMF cyclotron by recording photon pairs from pion stops in liquid hydrogen and deuterium targets. We obtained absolute branching ratios of (3.02 ± 0.27(stat.) ± 0.31(syst.)) × 10 −5 for hydrogen and (1.42 ± 0.09 0.12 (stat.) ± 0.11(syst.)) × 10 −5 for deuterium, and relative branching ratios of double radiative capture to single radiative capture of (7.68 ± 0.69(stat.) ± 0.79(syst.)) × 10 −5 for hydrogen and (5.44 ± 0.34 0.46 (stat.) ± 0.42(syst.))×10 −5 for deuterium. For hydrogen, the measured branching ratio and photon energy-angle distributions are in fair agreement with a reaction mechanism involving the annihilation of the incident π − on the π + cloud of the target proton. For deuterium, the measured branching ratio and energyangle distributions are qualitatively consistent with simple arguments for the expected role of the spectator neutron. A comparison between our hydrogen and deuterium data and earlier beryllium and carbon data reveals substantial changes in the relative branching ratios and the energy-angle distributions and is in agreement with the expected evolution of the reaction dynamics from an annihilation process in S-state capture to a bremsstrahlung process in P-state capture. Lastly, we comment on the relevance of the double radiative process to the investigation of the charged pion polarizability and the in-medium pion field.

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“…This work was later extended by Beder and Fearing [26] by considering also the contribution from the ∆ excitation processes. A recent comparison of the TRIUMF experiment [27,28] with the Beder-Fearing calculations provided a value of g OM C P (p) which is enhanced by ≈ 50% in comparison with the value of Eq. (1.12), which corresponds to using g P from Eq.…”

Section: Introductionmentioning

confidence: 99%

On radiative muon capture in hydrogen

Truhlík¹,

Khanna

2001

AIP Conference Proceedings

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We analyze the radiative capture of the negative muon in hydrogen using amplitudes derived within the chiral Lagrangian approach. Besides the leading and next to leading order terms, given by the well-known Rood-Tolhoek Hamiltonian, we extract from these amplitudes the corrections of the next order in 1/M (M is the nucleon mass). In addition, we estimate within the same formalism also the ∆(1232) isobar excitation effects and processes described by an anomalous Lagrangian. Using of the parameters of the model obtained from the analysis of the pion photoproduction, which restricts the arbitrariness of the πN ∆ and γN ∆ vertices off-shell, allows us to explain two times more of the discrepancy between the value g P CAC P of the induced pseudoscalar form factor g P , predicted by partial conservation of the axial current, and of g P extracted from the recent TRIUMF experiment, than the standard approach. Varying these parameters independently, one can remove the discrepancy completely.

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Measurement of the induced pseudoscalar coupling using radiative muon capture on hydrogen

Cited by 59 publications

References 44 publications

Gauge symmetric Δ(1232) couplings and the radiative muon capture in hydrogen

Gauge symmetric Δ(1232) couplings and the radiative muon capture in hydrogen

Double radiative pion capture on hydrogen and deuterium and the nucleon's pion cloud

On radiative muon capture in hydrogen

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