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Paper   IPM / Physic / 6834
School of Physics
  Title:   Positronium Hyperfine Splitting in Noncommutative Space at Order α6
1.  M. Haghighat
2.  S.M. Zebarjad
3.  F. Loran
  Status:   Published
  Journal: Phys. Rev. D
  No.:  50
  Vol.:  66
  Year:  2002
  Pages:   016005-1-4
  Supported by:  IPM
We obtain positronium Hyperfine Splitting owing to the non-commutativity of space and show that, in the leading order, it is proportional to θα6 where, θ is the parameter of non-commutativity. It is also shown that spatial non-commutativity splits the spacing between n=2 triplet excited levels E(23S1)→ E(23P2) which provides an experimental test on the non-commutativity of space.

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