Abstract
The experimental results obtained with the Crystal Ball detector for the physics of η-meson decays are reviewed. The η → 3π 0 Dalitz plot slope and the η → π 0 γγ decay width are measured with a high accuracy using 3 × 107 η decays. Upper limits on the η → 3γ, η → 2π 0 γ, and η → 3π 0 γ C-forbidden decays are found. The sensitivity of these upper limits to C violation is estimated. An upper limit on the η → 4π 0 C P-forbidden decay is found for the first time and the sensitivity of this value to C P violation is estimated.
Similar content being viewed by others
References
J. L. Goity, A. M. Bernstein, and B. R. Holstein, Phys. Rev. D 66, 076014 (2002).
M. J. Ramsey-Musolf and M. B. Wise, Phys. Rev. Lett. 89, 041601 (2002).
B. V. Martemyanov and V. S. Sopov, Phys. Rev. D 71, 017501 (2005).
A. G. Nicola and J. R. Pelaez, Phys. Rev. D 65, 054009 (2002).
P. Herczeg, Phys. Rev. D 51, 136 (1995).
B. M. K. Nefkens, Few-Body Syst. Suppl. 9, 193 (1995).
A. Starostin et al., Phys. Rev. C 64, 055205 (2001).
A. Starostin et al., Phys. Rev. C 67, 068201 (2003).
A. Starostin et al., Phys. Rev. C 72, 015205 (2005).
P. Di Vecchia et al., Nucl. Phys. B 181, 318 (1981).
W. B. Tippens et al., Phys. Rev. Lett. 87, 192001 (2001).
B. M. K. Nefkens et al., Phys. Rev. C 72, 035212 (2005).
L. Ametller, J. Bijnens, A. Bramon, and F. Cornet, Phys. Lett. B 276, 185 (1992).
J. Bijnens, A. Fayyazuddin, and J. Prades, Phys. Lett. B 379, 209 (1996).
E. Oset, J. R. Peláez, and L. Roca, Phys. Rev. D 67, 073013 (2003).
F. Binon et al., Nuovo Cimento A 71, 497 (1982).
M. N. Achasov et al., Nucl. Phys. B 600, 3 (2001).
D. Alde et al., Z. Phys. C 25, 225 (1984).
S. Prakhov et al., Phys. Rev. C 72, 025201 (2005).
B. M. K. Nefkens et al., Phys. Rev. Lett. 94, 041601 (2005).
J. Bernstein, G. Feinberg and T. D. Lee, Phys. Rev. 139, B1960 (1965).
S. Prakhov et al., Phys. Rev. Lett. 84, 4802 (2000).
Testing Chiral Perturbation Theory and C Invariance in η’ Decays, MAMI Proposal A2-3, Spokespersons A. Starostin and B. M. K. Nefkens (2005).
Test of Chiral Perturbation Theory and C and C P Invariance in Eta Meson Decay, MAMI Proposal A2-2, Spokespersons A. Starostin, B. M. K. Nefkens, and R. Beck (2005).
Author information
Authors and Affiliations
Additional information
Original Russian Text © A.B. Starostin, 2007, published in Yadernaya Fizika, 2007, Vol. 70, No. 7, pp. 1242–1246.