Charge symmetry violation in p n ---> d pi0 as a test of chiral effective field theory

van Kolck, U.; Niskanen, J.A.; Miller, G.A.

doi:10.1016/S0370-2693(00)01133-3

Charge symmetry violation in p n ---> d pi0 as a test of chiral effective field theory

U. van Kolck
(
- Caltech, Kellogg Lab and
- Washington U., Seattle
)
,
J.A. Niskanen
(
- Helsinki U.
)
,
G.A. Miller
(
- Washington U., Seattle
)

Jun, 2000

10 pages

Published in:

Phys.Lett.B 493 (2000) 65-72

e-Print:

nucl-th/0006042 [nucl-th]

DOI:

10.1016/S0370-2693(00)01133-3

Report number:

KRL-MAP-267,
NT-UW-00-15

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Abstract:

Chiral effective field theory predicts a specific charge symmetry violating amplitude for pion production. This term is shown to provide the dominant contribution to the forward-backward asymmetry in the angular distribution for the reaction

pn\to d\pi^0

, for reasonable values of the mass difference between down and up quarks,

\delta m_N

. Using a value

\delta m_N\approx

3 MeV leads to a prediction of a 10 standard deviation effect for a TRIUMF experiment.

Note:

9 pages, 1 figure, to be submitted to Phys.Lett. B Report-no: KRL MAP-267, NT@UW-00-15

p n: exclusive reaction
pi0: hadroproduction
deuteron: hadroproduction
charge: symmetry breaking
amplitude analysis
effective Lagrangian
symmetry: chiral
angular distribution: asymmetry
quark: mass difference
up

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