Observation of the charge symmetry breaking [formula presented] reaction near threshold

E. J. Stephenson, A. D. Bacher, C. E. Allgower, A. Gårdestig, C. M. Lavelle, G. A. Miller, H. Nann, J. Olmsted, P. V. Pancella, M. A. Pickar, J. Rapaport, T. Rinckel, A. Smith, H. M. Spinka, Ubirajara Van Kolck

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Abstract

We report the first observation of the charge symmetry breaking [Formula presented] reaction near threshold. Measurements using a magnetic channel (gated by two photons) of the [Formula presented] scattering angle and momentum (from time of flight) permitted reconstruction of the [Formula presented] “missing mass,” the quantity used to separate [Formula presented] events from the continuum of double radiative capture [Formula presented] events. We measured total cross sections for neutral pion production of [Formula presented] at 228.5 MeV and [Formula presented] at 231.8 MeV. The uncertainty is dominated by statistical errors. These cross sections arise fundamentally from the down-up quark mass difference and quark electromagnetic effects that contribute in part through meson mixing (e.g., [Formula presented]) mechanisms.

Original languageEnglish (US)
JournalPhysical Review Letters
Volume91
Issue number14
DOIs
StatePublished - Jan 1 2003

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broken symmetry
thresholds
quarks
cross sections
pions
mesons
electromagnetism
continuums
momentum
photons
scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Stephenson, E. J., Bacher, A. D., Allgower, C. E., Gårdestig, A., Lavelle, C. M., Miller, G. A., ... Van Kolck, U. (2003). Observation of the charge symmetry breaking [formula presented] reaction near threshold. Physical Review Letters, 91(14). https://doi.org/10.1103/PhysRevLett.91.142302

Observation of the charge symmetry breaking [formula presented] reaction near threshold. / Stephenson, E. J.; Bacher, A. D.; Allgower, C. E.; Gårdestig, A.; Lavelle, C. M.; Miller, G. A.; Nann, H.; Olmsted, J.; Pancella, P. V.; Pickar, M. A.; Rapaport, J.; Rinckel, T.; Smith, A.; Spinka, H. M.; Van Kolck, Ubirajara.

In: Physical Review Letters, Vol. 91, No. 14, 01.01.2003.

Research output: Contribution to journalArticle

Stephenson, EJ, Bacher, AD, Allgower, CE, Gårdestig, A, Lavelle, CM, Miller, GA, Nann, H, Olmsted, J, Pancella, PV, Pickar, MA, Rapaport, J, Rinckel, T, Smith, A, Spinka, HM & Van Kolck, U 2003, 'Observation of the charge symmetry breaking [formula presented] reaction near threshold', Physical Review Letters, vol. 91, no. 14. https://doi.org/10.1103/PhysRevLett.91.142302
Stephenson EJ, Bacher AD, Allgower CE, Gårdestig A, Lavelle CM, Miller GA et al. Observation of the charge symmetry breaking [formula presented] reaction near threshold. Physical Review Letters. 2003 Jan 1;91(14). https://doi.org/10.1103/PhysRevLett.91.142302
Stephenson, E. J. ; Bacher, A. D. ; Allgower, C. E. ; Gårdestig, A. ; Lavelle, C. M. ; Miller, G. A. ; Nann, H. ; Olmsted, J. ; Pancella, P. V. ; Pickar, M. A. ; Rapaport, J. ; Rinckel, T. ; Smith, A. ; Spinka, H. M. ; Van Kolck, Ubirajara. / Observation of the charge symmetry breaking [formula presented] reaction near threshold. In: Physical Review Letters. 2003 ; Vol. 91, No. 14.
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