Charge symmetry breaking in n p --> d pi0
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, S. Yen
Abstract
The forward--backward asymmetry in n p --> d pi0, which must be zero in the center-of-mass system if charge symmetry is respected, has been measured to be [17.2 +/- 8 (stat) +/- 5.5 (sys)] * 10-4, at an incident neutron energy of 279.5 MeV. This charge symmetry breaking observable was extracted by fitting the data with GEANT-based simulations and is compared to recent chiral effective field theory calculations, with implications regarding the value of the u d quark mass difference.
Create a lesson
Related papers
Measurements of γv p π+ π-p' Cross Sections with the CLAS12 Detector for Q2 from 2.4-8.0 GeV2 and W from 1.4-2.1 GeV
K. Neupane, R. W. Gothe, D. S. Carman et al.
Constraining the f0(980) Structure and Formation Dynamics via Anisotropy-Response Scaling
Roy A. Lacey
Comment on "Non-Monotonicity of Transverse-Momentum Correlations in Au+Au Collisions at RHIC"
Roy A. Lacey
Exploring nucleon spin by Drell-Yan process
Wen-Chen Chang
Modernization in processing and dissemination of experimental cross section data in EXFOR
Naohiko Otuka, Vidya Devi
Photon-induced J/ψ as a linearly polarized probe of collision geometry in relativistic heavy-ion collisions
STAR Collaboration