Exotic Matter-Antimatter Molecules

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Poster New theoretical developments


Cheuk-Yin Wong (Oak Ridge National Laboratory)


In a nuclear collision at RHIC and LHC, a large number of particles and antiparticles are produced. The production of matter and antimatter particles in close space-time proximity raises the interesting question whether chance encounters of some of the produced charged particles and antiparticles may lead to the formation of exotic matter-antimatter molecules as debris of the collision. The detection of new matter-antimatter molecules may be a difficult task. It is nonetheless an interesting theoretical question to investigate the general factors affecting the stability of matter-antimatter molecules. Using a formalism similar to the previous investigation of the X(3872) as a heavy-quark molecular state [1], we find that matter-antimatter molecules with charged constituents (m1+,m2-,m2bar+,m1bar-) possess bound states if their constituent mass ratio m1/m2 is greater than about 4 [2]. This stability condition suggests that the binding of matter-antimatter molecules is a rather common phenomenon. We evaluate the binding energies of exotic matter-antimatter molecules (mu+ e-)-(e+ mu-), (pi+ e-)-(e+ pi-), (K+ e-)-(e+ K-), (p e-)-(e+ pbar), (p mu)-(mu+ pbar), and (K+ mu-)-(mu+ K-), which satisfy the stability condition. We estimate the molecular annihilation lifetimes in their s states. [1] C. Y. Wong, Phys. Rev. C69, 055202 (2004). [2] C. Y. Wong and T. G. Lee, arXiv:1103.5774 (2011).

Primary author

Cheuk-Yin Wong (Oak Ridge National Laboratory)


Teck-Ghee Lee (Auburn University)

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