Event generators for η/η' rare decays into π+π-l+l- and e+e-μ+μ-

  • Study of the rare and forbidden decays of η/η' offers a sensitive probe to test fundamental symmetries of quantum chromodynamics and search for new physics beyond the Standard Model. To study the rare decays of η/η' to π+π-e+e-, π+π-μ+μ- and e+e-μ+μ- at the BESⅢ detector, we developed several event generators based on the vector meson dominant model with finite-width corrections and the pseudoscalar mesons mixing theory. The various distributions from event generators are in good agreement with the theoretical predictions, which indicates that the event generators work very well after implemention in the BESⅢ Monte Carlo simulation package. In the BESⅢ physics analysis, the performance of the event generators will be improved in accordance with the distributions of different variables of η/η' from data and the improvement on the theoretical calculations.
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  • [1] Reece M, WANG L. T. J. High Energy Phys., 2009, 07:0512 LI H B, LUO T. arXiv:0911.2067v33 GAO D N. Mod. Phys. Lett. A, 2002, 17: 15834 Ambrosio F et al. (KLOE collaboration). Phys. Lett. B,2009, 675: 2835 Berlowski M et al. (CELSIUS/WASA collaboration). Phys. Rev. D, 2008, 77: 0320046 Crede V et al. (CBELSA/TAPS collaboration). Phys. Rev. C, 2009, 80: 0552027 Akhmetshin R R et al. (CMD-2 collaboration). Phys. Lett. B, 2001, 501: 1918 Naik P, Rademacker J, Asner D M et al. Phys. Rev. Lett.,2009, 102: 0618019 Ablikim M et al. Nucl. Instrum. Methods A, 2010, 614:34510 Asner D M et al. Physics at BES0. Edited by CHAO K T, WANG Y F. Int. J. Mod. Phys. A, 2009, 24(1 Supp.)11 Ablikim M et al. (BES0 collaboration). Phys. Rev. D,2011, 83: 01200312 Ablikim M et al. (BES0 collaboration). Phys. Rev. D,2010, 81: 05200513 Cabibbo N, Maksymowicz A. Phys. Rev. B, 1965, 137: 43814 Pais A, Treiman S. B. Phys. Rev., 1968, 168: 185815 Petri T. arXiv:1010.2378v116 Holstein B R. Phys. Scripta, 2002, T99: 5517 Picciotto C, Richardson S. Phys. Rev. D, 1993, 48: 339518 Gounaris G J, Sakurai J J. Phys. Rev. Lett., 1968, 21: 24419 Agostinelli S et al. Nucl. Instrum. Methods Phys. Res. Sect. A, 2003, 506: 25020 Jadach S,Ward B F L,Was Z. Comp. Phys. Commu., 2000,130: 260; Jadach S, Ward B F L, Was Z. Phys. Rev. D,2001, 63: 11300921 PING R G. Chinese Phys. C (HEP NP), 2008, 32: 59922 Cabibbo N, Maksymowicz A. Phys. Rev., 1965, 137: B43823 Nakamura K. et al. J. Phys. G, 2010, 37: 07502124 QIN L Q et al. Measurement of η'→π+π-e+e-. In: BES0 Physics and Software Workshop. September 15-18, 2011
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ZHANG Zhen-Yu and QIN Li-Qing. Event generators for η/η' rare decays into π+π-l+l- and e+e-μ+μ-[J]. Chinese Physics C, 2012, 36(10): 926-931. doi: 10.1088/1674-1137/36/10/002
ZHANG Zhen-Yu and QIN Li-Qing. Event generators for η/η' rare decays into π+π-l+l- and e+e-μ+μ-[J]. Chinese Physics C, 2012, 36(10): 926-931.  doi: 10.1088/1674-1137/36/10/002 shu
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Received: 2012-02-17
Revised: 2012-04-01
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Event generators for η/η' rare decays into π+π-l+l- and e+e-μ+μ-

    Corresponding author: ZHANG Zhen-Yu,

Abstract: Study of the rare and forbidden decays of η/η' offers a sensitive probe to test fundamental symmetries of quantum chromodynamics and search for new physics beyond the Standard Model. To study the rare decays of η/η' to π+π-e+e-, π+π-μ+μ- and e+e-μ+μ- at the BESⅢ detector, we developed several event generators based on the vector meson dominant model with finite-width corrections and the pseudoscalar mesons mixing theory. The various distributions from event generators are in good agreement with the theoretical predictions, which indicates that the event generators work very well after implemention in the BESⅢ Monte Carlo simulation package. In the BESⅢ physics analysis, the performance of the event generators will be improved in accordance with the distributions of different variables of η/η' from data and the improvement on the theoretical calculations.

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