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Yuri Kamyshkov/ University of Tennessee email: kamyshkov@utk

Mini-Workshop, WU St. Louis, February 11, 2011. Vacuum N-Nbar Oscillations vs Intranuclear Transformations. Review of recent status. Yuri Kamyshkov/ University of Tennessee email: kamyshkov@utk.edu. All beyond SM physics is here. n nbar t ransition probability.  -mixing amplitude. .

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Yuri Kamyshkov/ University of Tennessee email: kamyshkov@utk

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  1. Mini-Workshop, WU St. Louis, February 11, 2011 Vacuum N-Nbar Oscillations vs Intranuclear Transformations Review of recent status Yuri Kamyshkov/ University of Tennessee email: kamyshkov@utk.edu

  2. All beyond SM physics is here nnbar transition probability -mixing amplitude 

  3. nnbar transition probability (for given )

  4. Suppression of nnbar in intranuclear transitions (Friedman and Gal, 2008)

  5. General approach: one of the neutrons in the nucleus transforms to anti-neutron and the latter is annihilated with other nucleons to pions

  6. Existing N-Nbar limits Sensitivity for free neutron search (appearance probability) Will use ILL experiment limit as a unit of sensitivity = 1u Sensitivity for bound neutron search (in nucleon decay expts) Corresponds to sensitivity = 16u

  7. Free Neutron and Intranuclear NNbar Limits Comparison Important to know theoretical uncertainty Is nuclear theory reliable? complete? intranuclear search experiments: Super-K, Soudan-2 Frejus Free neutron search limit (ILL)

  8. Bound neutron N-Nbar search experiments * Not yet published Observed improvement weaker than SQRT is due to irreducible background of atmospheric ’s. Still possible to improve a limit (though slowly) but impossible to claim a discovery.

  9. Conversion of Bound Limit to free Oscillation Limit V. Kopeliovich 2010, Deuterium Friedman and Gal 2008, Oxygen Dover, Gal et. al, old

  10. Claudio Ciofi degli Atti (Perugia U.) is going to look at this (January 2011)

  11. Proposed by Stuart Raby (2010) • overlap of two quarks wavefunctions is more probable than for 3 quarks • such 2 quarks might be coming from proton (not only neutron) • 4-antiquark final state annihilates faster

  12. All these processes governed by the same crossing amplitude can result into the same indistinguishable final state (of ~ 5 pions) • Existing intranuclear NNbar • limits will need to be re-evaluated

  13. More on n  nbar suppression: sensitivity to CPT violation Following Yu. Abov, F. Djeparov, and L. Okun, Pisma ZhETF 39 (1984) 493 • Valid only if 0 , i.e. if n  nbar transformation exist • Transitions for free neutronsV=0are suppressed when • Suppression possible if m >  (due to CPT violation) • In the intranuclear transitions where V~10 MeV small provides no additional suppression. Intranuclear transitions are not sensitive to m !

  14. m (V=0) vs  in NNbar search (if 0) Experimental limits on mass difference Uncertainty of intranuclear suppression If NNbar transition will be observed this will be a new limit of CPT m test

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