Meson exchange currents and the extraction of ann and gp from the reaction μ−d→nnνμ

Dogotar, G.E.; Eramzhyan, R.A.; Truhlík, E.

doi:10.1063/1.31958

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2009

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“…These MECs were applied in calculations of the capture rates and neutron-neutron spectra for reaction (1.1)in Refs. [4][5][6][7]. The obtained values of the doublet capture rate Λ 1/2 were in the interval 398 s −1 -416 s −1 , which was considered in a reasonable agreement with the measured value Λ 1/2 = 409 ± 40 s −1 [8], in contrast to another measurement [9] providing somehow larger Λ 1/2 = 470 ± 29 s −1 .…”

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confidence: 86%

Muon Capture in Deuterium

Ricci,

Truhlik,

Mosconi

et al. 2009

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Model dependence of the capture rates of the negative muon capture in deuterium is studied starting from potential models and the weak two-body meson exchange currents constructed in the tree approximation and also from an effective field theory. The tree one-boson exchange currents are derived from the hard pion chiral Lagrangians of the N ∆πρωa 1 system. If constructed in conjunction with the one-boson exchange potentials, the capture rates can be calculated consistently. On the other hand, the effective field theory currents, constructed within the heavy baryon chiral perturbation theory, contain a low energy constant dR that cannot be extracted from data at the one-particle level nor determined from the first principles. Comparative analysis of the results for the doublet transition rate allows us to extract the constant dR .

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