Physics of Atomic Nuclei

, Volume 80, Issue 5, pp 983–986 | Cite as

Search for a massive invisible particle X 0 in B +e + X 0 and B +μ + X 0 decays

  • Chanseok Park
XIX International Moscow School of Physics (44th ITEPWinter School of Physics) and International School of Physics “QCD and Exotic Hadrons” February 16–23, 2016, Serpukhov, Russia/Elementary Particles and Fields Experiment


We present a search for a non-Standard-Model invisible particle X 0 in the mass range 0.1–1.8 GeV/c 2 in B +e + X 0 and B +μ + X 0 decays. The results are obtained from a 711 fb−1 data sample which corresponds to 772 × 106 \(B\bar B\) pairs, collected at the Υ(4S) resonance with the Belle detector at the KEKB e + e collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 10−6.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    K. Agashe, N. G. Deshpande, and G.-H. Wu, Phys. Lett. B 489, 367 (2000).ADSCrossRefGoogle Scholar
  2. 2.
    D. Gorbunov and M. Shaposhnikov, J. High Energy Phys. 0710, 015 (2007).ADSCrossRefGoogle Scholar
  3. 3.
    A. Dedes, H. Dreiner, and P. Richardson, Phys. Rev. D 65, 015001 (2001).ADSCrossRefGoogle Scholar
  4. 4.
    M. Feindt et al., Nucl. Instrum. Methods A 654, 432 (2011).ADSCrossRefGoogle Scholar
  5. 5.
    A. J. Bevan et al., Eur. Phys. J. C 74, 3026 (2014).ADSCrossRefGoogle Scholar
  6. 6.
    S. Kurokawa and E. Kikutani, Nucl. Instrum. Methods A 499, 1 (2003)ADSCrossRefGoogle Scholar
  7. 6a.
    T. Abe et al., Prog. Theor. Exp. Phys. 2013, 03A001 (and following articles up to 03A011) (2013).Google Scholar
  8. 7.
    D. J. Lange, Nucl. Instrum. Methods A 462, 152 (2001).ADSCrossRefGoogle Scholar
  9. 8.
    E. Barberio and Z. Wąs, Comput. Phys. Commun. 79, 291 (1994).ADSCrossRefGoogle Scholar
  10. 9.
    Y. Yook et al. (Belle Collab.), Phys. Rev. D 91, 052016 (2015).ADSCrossRefGoogle Scholar
  11. 10.
    A. Heller et al. (Belle Collab.), Phys. Rev. D 91, 112009 (2015).ADSCrossRefGoogle Scholar
  12. 11.
    G. J. Feldman and R. D. Cousins, Phys. Rev. D 57, 3873 (1998).ADSCrossRefGoogle Scholar
  13. 12.
    J. Conrad et al., Phys. Rev. D 67, 012002 (2003).ADSCrossRefGoogle Scholar
  14. 13.
    K. A. Olive et al. (Particle Data Group), Chin. Phys. C 38, 090001 (2014).ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  1. 1.Yonsei UniversitySeoulKorea

Personalised recommendations