Charge Symmetry Breaking in $np\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}$

Charge Symmetry Breaking in $n p \to d π^{0}$

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, and S. Yen

Phys. Rev. Lett. 91, 212302 – Published 21 November 2003

Abstract

The forward-backward asymmetry in $n p \to d π^{0}$ , which must be zero in the center-of-mass system if charge symmetry is respected, has been measured to be $[17.2 \pm 8.0 (s t a t) \pm 5.5 (s y s t)] \times 10^{- 4}$ , at an incident neutron energy of 279.5 MeV. This observable is compared to recent chiral effective field theory calculations, with implications regarding the $d u$ quark mass difference.

Received 5 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.212302

Authors & Affiliations

A. K. Opper^1,*, E. Korkmaz², D. A. Hutcheon^3,4, R. Abegg^3,4,†, C. A. Davis^4,5, R. W. Finlay¹, P. W. Green^3,4, L. G. Greeniaus^3,4, D. V. Jordan^1,3,‡, J. A. Niskanen⁶, G. V. O’Rielly^2,§, T. A. Porcelli², S. D. Reitzner^1,∥, P. L. Walden^4,7, and S. Yen⁴

¹Ohio University, Athens, Ohio 45701, USA
²University of Northern British Columbia, Prince George, British Columbia, Canada
³University of Alberta, Edmonton, Alberta, Canada
⁴TRIUMF, Vancouver, British Columbia, Canada
⁵University of Manitoba, Winnipeg, Manitoba, Canada
⁶University of Helsinki, Helsinki, Finland
⁷University of British Columbia, Vancouver, British Columbia, Canada

^*Email address: opper@ohiou.edu
^†Deceased.
^‡Current address: Pacific Northwest National Labs, Richland, WA 99352, USA.
^§Current address: University of Massachusetts, Dartmouth, North Dartmouth, MA 02747, USA.
^∥Current address: The Ohio State University, Columbus, OH 43210, USA.

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Vol. 91, Iss. 21 — 21 November 2003

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Physical Review Letters

Charge Symmetry Breaking in np→dπ0

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, and S. Yen

Phys. Rev. Lett. 91, 212302 – Published 21 November 2003

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Charge Symmetry Breaking in $n p \to d π^{0}$