Precision extraction of a_nn from pi- d --> n n gamma using chiral perturbation theory
| dc.creator | Gardestig, A. | |
| dc.creator | Phillips, D. R. | |
| dc.date | 2007-10-15 | |
| dc.date.accessioned | 2026-07-07T13:04:31Z | |
| dc.date.available | 2026-07-07T13:04:31Z | |
| dc.description | The neutron-neutron scattering length a_nn provides a sensitive probe of charge-symmetry breaking in the strong interaction. Here we summarize our recent efforts to use chiral perturbation theory in order to systematically relate a_nn to the shape of the neutron spectrum in the reaction pi- d --> n n gamma. In particular we show how the chiral symmetry of QCD relates this process to low-energy electroweak reactions such as p p --> d e+ nu_e. This allows us to reduce the uncertainty in the extracted a_nn (mainly due to short-distance physics in the two-nucleon system) by a factor of more than three, to <0.05 fm. We also report first results on the impact that two-nucleon mechanisms of chiral order P^4 have on the pi- d --> n n gamma neutron spectrum. | |
| dc.description | Invited talk at MENU2007, 10 pages, 3 figures, uses conference.cls and MENU07macros.tex (provided) | |
| dc.identifier | https://arxiv.org/abs/0710.2830 | |
| dc.identifier | http://arxiv.org/abs/0710.2830 | |
| dc.identifier | ECONF C070910:139,2007 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/227192 | |
| dc.subject | Nuclear Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Precision extraction of a_nn from pi- d --> n n gamma using chiral perturbation theory | |
| dc.type | text |