Title: Matter-Antimatter Molecules

speaker： Prof. Cheuk-yin Wong (Oak Ridge National Laboratory)

Time: 10:00AM, Oct. 17th (Monday)

Place: Theory Division，319

Abstract: The study of matter-antimatter molecules has a long history,starting with the pioneering work of John A. Wheeler in 1946.

Molecular states appears not only in atomic and molecular physics,but also in sub-atomic physics such as the X(3872) state as a heavy-quark meson molecule [1]. Because a large number of particles and antiparticles are produced in in (e+)-(e-) coliders such as BEPC and in high-energy heavy-ion collisions, we examine further the stability of matter-antimatter molecules with constituents (m1+, m2-, m2bar+, m1bar-) under their mutual electromagnetic interactions [2]. We find that matter-antimatter molecules possess bound states if their constituent mass ratio m1/m2 is greater than about 4. This stability condition suggests that the binding of matter-antimatter molecules is a rather common phenomenon.

[1] Cheuk-Yin Wong, Phys. Rev. C69, 055202 (2004) [arXiv:hep-ph/0311088].

[2] Cheuk-Yin Wong and Teck-Ghee Lee, Annals of Physics,326 2138 (2011),

[arXiv:1103.5774] (2011).