### Session C8: Nuclear Theory I

1:30 PM–3:18 PM, Saturday, April 22, 2006
Hyatt Regency Dallas Room: Cumberland A

Abstract ID: BAPS.2006.APR.C8.7

### Abstract: C8.00007 : Precision extraction of $a_{nn}$ from $\pi^-d\to nn\gamma$ using $\chi$PT

2:42 PM–2:54 PM

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#### Authors:

Anders G{\aa}rdestig
(University of South Carolina)

Daniel Phillips
(Ohio University)

We present an updated chiral perturbation theory calculation of the $\pi^-d\to nn\gamma$ reaction. By using other observables to constrain the unknown short-distance physics, we can drastically reduce the theoretical error in the extracted neutron-neutron scattering length. Further consequences of the results will be discussed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.APR.C8.7