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

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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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10.1103/PhysRevLett.91.142302

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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",

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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.

UR - https://www.scopus.com/pages/publications/85038343418

UR - https://www.scopus.com/pages/publications/85038343418#tab=citedBy

U2 - 10.1103/PhysRevLett.91.142302

DO - 10.1103/PhysRevLett.91.142302

M3 - Article

AN - SCOPUS:85038343418

SN - 0031-9007

VL - 91

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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