Neutron-neutron scattering length from the reaction gamma d -&gt; pi^+ nn employing chiral perturbation theory

Lensky, V.; Kudryavtsev, A.; Baru, V.; Hanhart, C.; Haidenbauer, J.; Meissner, U.G.; Epelbaum, E.

doi:10.1140/epja/i2007-10461-y

Journal Article

Neutron-neutron scattering length from the reaction gamma d -> pi^+ nn employing chiral perturbation theory

Lensky, V.FZJ* ; Baru, V.FZJ* ; Epelbaum, E.FZJ* ; Hanhart, C.FZJ* ; Haidenbauer, J.FZJ* ; Kudryavtsev, A. ; Meissner, U. G.FZJ*

2007
Springer Berlin

The European physical journal / A 33, 339 - 348 (2007) [10.1140/epja/i2007-10461-y]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10522 doi:10.1140/epja/i2007-10461-y

Abstract: We discuss the possibility to extract the neutron-neutron scattering length a(nn) from experimental spectra on the reaction gamma d -> pi(+)nn. The transition operator is calculated to high accuracy from chiral. perturbation theory. We argue that for properly chosen kinematics, the theoretical uncertainty of the method can be as low as 0.1 fm.

Keyword(s): photon deuteron: exclusive reaction ; pi+: photoproduction ; differential cross section: momentum dependence ; n n: scattering length ; perturbation theory: chiral ; numerical calculations ; photon deuteron --> 2n pi+