Natural Explanation of Recent Results on e+e- → λλ¯

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Abstract

We show that the recent experimental data on the cross section of the process e+e- ΛΛ¯  near the threshold can be perfectly explained by the final-state interaction of Λ and  Λ¯. The enhancement of the cross section is related to the existence of low-energy real or virtual state in the corresponding potential. We present a simple analytical formula that fits the experimental data very well.

About the authors

A. I Mil'shteyn

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia; Novosibirsk State University, 630090, Novosibirsk, Russia

Email: a.i.milstein@inp.nsk.su

S. G Sal'nikov

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia; Novosibirsk State University, 630090, Novosibirsk, Russia

Author for correspondence.
Email: s.g.salnikov@inp.nsk.su

References

  1. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. D 107, 072005 (2023).
  2. B. Aubert, M. Bona, D. Boutigny et al. (BABAR Collaboration), Phys. Rev. D 76, 092006 (2007).
  3. M. Ablikim, M. N. Achasov, S. Ahmed et al. (BESIII Collaboration), Phys. Rev. D 97, 032013 (2018).
  4. M. Ablikim, M. N. Achasov, P. Adlarson, M. Ablikim et al. (BESIII Collaboration), Phys. Rev. Lett. 123, 122003 (2019).
  5. B. Aubert, R. Barate, D. Boutigny et al. (BABAR Collaboration), Phys. Rev. D 73, 012005 (2006).
  6. J. P. Lees, V. Poireau, V. Tisserand et al. (BABAR Collaboration), Phys. Rev. D 87, 092005 (2013).
  7. R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov et al. (CMD-3 Collaboration), Phys. Lett. B 759, 634 (2016).
  8. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. Lett. 124, 042001 (2020).
  9. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Lett. B 817, 136328 (2021).
  10. R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov et al. (CMD-3 Collaboration), Phys. Lett. B 794, 64 (2019).
  11. M. Ablikim, M. N. Achasov, X. C. Ai et al. (BESIII Collaboration), Phys. Rev. D 91, 112004 (2015).
  12. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. D 99, 092002 (2019).
  13. M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov et al. (SND Collaboration), Phys. Rev. D 90, 112007 (2014).
  14. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Nat. Phys. 17, 1200 (2021).
  15. M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov et al. (SND Collaboration), Eur. Phys. J. C 82, 761 (2022).
  16. G. Pakhlova, I. Adachi, H. Aihara et al. (BELLE Collaboration), Phys. Rev. Lett. 101, 172001 (2008).
  17. M. Ablikim, M. N. Achasov, S. Ahmed et al. (BESIII Collaboration), Phys. Rev. Lett. 120, 132001 (2018).
  18. B. Aubert, M. Bona, Y. Karyotakis et al. (BABAR Collaboration), Phys. Rev. Lett. 102, 012001 (2009).
  19. J. Haidenbauer, X.-W. Kang, and U.-G. Meißner, Nucl. Phys. A 929, 102 (2014).
  20. J. Haidenbauer and U.-G. Meißner, Phys. Lett. B 761, 456 (2016).
  21. J. Haidenbauer, U.-G. Meißner, and L.-Y. Dai, Phys. Rev. D 103, 014028 (2021).
  22. A. I. Milstein and S. G. Salnikov, Phys. Rev. D 104, 014007 (2021).
  23. A. I. Milstein and S. G. Salnikov, Phys. Rev. D 105, 074002 (2022).
  24. A. I. Milstein and S. G. Salnikov, Phys. Rev. D 105, L031501 (2022).
  25. A. I. Milstein and S. G. Salnikov, Phys. Rev. D 106, 074012 (2022).
  26. L. D. Landau and E. M. Lifshitz, Quantum Mechanics - Non-relativistic Theory, Pergamon Press, Oxford (1991).
  27. S. M. Flatt'e, Phys. Lett. B 63, 224 (1976).
  28. B. Aubert, M. Bona, D. Boutigny et al. (BABAR Collaboration), Phys. Rev. D 76, 012008 (2007).
  29. Y.-W. Chang, M.-Z. Wang, I. Adachi et al. (BELLE Collaboration), Phys. Rev. D 79, 052006 (2009).
  30. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. D 100, 032009 (2019).
  31. M. Ablikim, M. N. Achasov, S. Ahmed et al. (BESIII Collaboration), Phys. Rev. D 99, 032001 (2019).
  32. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. Lett. 124, 112001 (2020).
  33. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. D 102, 012008 (2020).
  34. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), Phys. Rev. D 104, 032007 (2021).
  35. M. Ablikim, M. N. Achasov, P. Adlarson et al. (BESIII Collaboration), arXiv:2112.13219 [hep-ex].
  36. L. Xia, Supl. la Rev. Mex. F'ısica 3, 1 (2022).

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