Publication:
Η → π⁰ ϒ ϒ decay within a chiral unitary approachη

Loading...
Thumbnail Image
Full text at PDC
Publication Date
2003-04
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Amer Physical Soc
Citations
Google Scholar
Research Projects
Organizational Units
Journal Issue
Abstract
We improve the calculations of the η→π⁰ϒϒ decay within the context of meson chiral Lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus generating the a₀(980) resonance and fixing the long standing sign ambiguity on its contribution. This also allows us to calculate the loops with one vector meson exchange, thus removing a former source of uncertainty. In addition we ensure the consistency of the approach with other processes, first, by using vector meson dominance couplings normalized to agree with radiative vector meson decays and, second, by checking the consistency of the calculations with the related ϒ ϒ → π⁰η reaction. We find an η→π⁰ ϒϒ decay width of 0.47 ± 0.10 eV, in clear disagreement with published data but in remarkable agreement with the most recent measurement.
Description
©2003 The American Physical Society. We are especially grateful to J.A. Oller for fruitful discussions, technical help, and his careful reading of the manuscript. We would also like to acknowledge useful discussions with J. Bijnens. One of us, L.R., acknowledges support from the Consejo Superior de Investigaciones Científicas. J.R.P. acknowledges financial support from a CICYT-INFN collaboration grant as well as a Marie Curie fellowship under contract MCFI-2001-01155. He also thanks the Dipartimento di Fisica, Universita’ di Firenze, and INFN, Sezione di Firenze, for its hospitality. This work is also partly supported by DGICYT contract numbers BFM2000-1326, PB98-0782, and the E.U. EURIDICE network contract no. HPRN-CT- 2002-00311 2002-00311.
Unesco subjects
Keywords
Citation
[1] D. Alde et al., Yad. Fiz. 40, 1447 (1984); D. Alde et al., Z. Phys. C 25, 225 (1984); L. G. Landsberg, Phys. Rep. 128 301 (1985). [2] Particle Data Group, K. Hagiwara et al., Phys. Rev. D 66, 010001 (2002). [3] J. N. Ng and D. J. Peters, Phys. Rev. D 47, 4939 (1993). [4] Y. Nemoto, M. Oka, and M. Takizawa, Phys. Rev. D 54, 6777 (1996). [5] L. Ametller, J. Bijnens, A. Bramon, and F. Cornet, Phys. Lett. B 276, 185 (1992). [6] S. Oneda and G. Oppo, Phys. Rev. 160, 1397 (1968). [7] C. Picciotto, Nuovo Cimento A 105, 27 (1992). [8] A. A. Bel’kov, A. V. Lanyov, and S. Scherer, J. Phys. G 22, 1383 (1996). [9] S. Bellucci and C. Bruno, Nucl. Phys. B452, 626 (1995). [10] J. Bijnens, A. Fayyazuddin, and J. Prades, Phys. Lett. B 379, 209 (1996). [11] M. N. Achasov et al., Nucl. Phys. B600, 3 (2001). [12] P. Ko, Phys. Rev. D 47, 3933 (1993!. [13] P. Ko, Phys. Lett. B 349, 555 (1995). [14] M. Jetter, Nucl. Phys. B459, 283 (1996). [15] JADE Collaboration, T. Oest et al., Z. Phys. C 47, 343 (1990). [16] Crystal Ball Collaboration, D. Antreasyan et al., Phys. Rev. D 33, 1847 (1986). [17] J. A. Oller and E. Oset, Nucl. Phys. A620, 438 (1997); A652, 407€ (1997). [18] N. Kaiser, Eur. Phys. J. A 3, 307 (1998). [19] J. A. Oller, E. Oset, and J. R. Peláez, Phys. Rev. Lett. 80, 3452 (1998); Phys. Rev. D 59, 74001 (1999); 60, 099906(E) (1990). [20] J. A. Oller and E. Oset, Phys. Rev. D 60, 074023 (1999). [21] J. Nieves and E. Ruiz Arriola, Nucl. Phys. A679, 57 (2000). [22] A. Gomez Nicola and J. R. Peláez, Phys. Rev. D 65, 054009 (2002). [23] J. A. Oller and E. Oset, Nucl. Phys. A629, 739 (1998). [24] A. Dobado and J. R. Peláez, Z. Phy C 57, 501 (1993). [25] H. Yamagishi and I. Zahed, Ann. Phys. (N.Y.9 247, 292 (1996). [26] C. H. Lee, H. Yamagishi, and I. Zahed, Nucl. Phys. A653, 185 (1999). [27] A. Bramon, R. Escribano, J. L. Lucio Martínez, and M. Napsuciale, Phys. Lett. B 517, 345 (2001). [28] J. E. Palomar, S. Hirenzaki, and E. Oset, Nucl. Phys. A707, 161 (2002). [29] E. Marco, S. Hirenzaki, E. Oset, and H. Toki, Phys. Lett. B 470, 20 (1999). [30] S. Prakhov, in Proceedings of the International Conference of Non-Accelerator New Physics, Dubna, Russia; B. M. Nefkens and J. W. Price, in the Eta Physics Handbook, Proceedings of the Uppsala Workshop, http://www.tsl.uu.se/faldt/eta/ Proceedings.html [Phys. Scr. T99, 114 (20029]. [31] J. Gasser and H. Leutwyler, Ann. Phys. (N.Y.) 158, 142 (1984). [32] G. Ecker, J. Gasser, A. Pich, and E. de Rafael, Nucl. Phys. B321, 311 (1989). [33] A. Bramon, A. Grau, and G. Pancheri, Phys. Lett. B 283, 416 (1992). [34] A. Bramon, A. Grau, and G. Pancheri, Phys. Lett. B 344, 240 (1995). [35] J. Bijnens and F. Cornet, Nucl. Phys. B296, 557 (1988). [36] J. F. Donoghue, B. R. Holstein, and Y. C. Lin, Phys. Rev. D 37, 2423 (1988). [37] H. Albrecht et al., Z. Phys. C 48, 183 (1989). [38] J. F. Donoghue and B. R. Holstein, Phys. Rev. D 48, 137 (1993). [39] T. Oest et al., Z. Phys. C 47, 343 (1990). [40] D. Antreasyan et al., Phys. Rev. D 33, 1847 (1986). [41] J. A. Oller, E. Oset, and J. E. Palomar, Phys. Rev. D 63, 114009 (2001).
Collections