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; U. van Kolck

doi:10.1103/PhysRevLett.91.142302

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, U. 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 language	English (US)
Journal	Physical review letters
Volume	91
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.91.142302
State	Published - 2003
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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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, 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

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

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title = "Observation of the charge symmetry breaking [formula presented] reaction near threshold",

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.",

author = "Stephenson, {E. J.} and Bacher, {A. D.} and Allgower, {C. E.} and A. G{\aa}rdestig and Lavelle, {C. M.} and Miller, {G. A.} and H. Nann and J. Olmsted and Pancella, {P. V.} and Pickar, {M. A.} and J. Rapaport and T. Rinckel and A. Smith and Spinka, {H. M.} and {van Kolck}, U.",

year = "2003",

doi = "10.1103/PhysRevLett.91.142302",

language = "English (US)",

volume = "91",

journal = "Physical review letters",

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publisher = "American Physical Society",

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T1 - Observation of the charge symmetry breaking [formula presented] reaction near threshold

AU - Stephenson, E. J.

AU - Bacher, A. D.

AU - Allgower, C. E.

AU - Gårdestig, A.

AU - Lavelle, C. M.

AU - Miller, G. A.

AU - Nann, H.

AU - Olmsted, J.

AU - Pancella, P. V.

AU - Pickar, M. A.

AU - Rapaport, J.

AU - Rinckel, T.

AU - Smith, A.

AU - Spinka, H. M.

AU - van Kolck, U.

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.91.142302

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JO - Physical review letters

JF - Physical review letters

IS - 14

ER -

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

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