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19 April 2024

» arxiv » nucl-ex/0306027

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Charge symmetry breaking in n p --> d pi^0
A.K. Opper ; E. Korkmaz ; D.A. Hutcheon ; R. Abegg ; C.A. Davis ; R.W. Finlay ; P.W. Green ; L.G. Greeniaus ; D.V. Jordan ; J.A. Niskanen ; G.V. O’Rielly ; T.A. Porcelli ; S.D. Reitzner ; P.L. Walden ; S. Yen ;
Date:	19 Jun 2003
Journal:	Phys.Rev.Lett. 91 (2003) 212302
Subject:	nucl-ex
Abstract:	The forward--backward asymmetry in n p --> d pi^0, which must be zero in the center-of-mass system if charge symmetry is respected, has been measured to be [17.2 +/- 8 (stat) +/- 5.5 (sys)] * 10^{-4}, at an incident neutron energy of 279.5 MeV. This charge symmetry breaking observable was extracted by fitting the data with GEANT-based simulations and is compared to recent chiral effective field theory calculations, with implications regarding the value of the u d quark mass difference.
Source:	arXiv, nucl-ex/0306027
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