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Hadronic weak interactions from the photodisintegration of the deuteron

Hadronic weak interactions from the photodisintegration of the deuteron. Chang Ho Hyun Daegu University Korea Baryons 2013, Glasgow June 25, 2013. Outline Aim Theory Results Prospects. Aim. Nucleon-nucleon interactions below pion threshold.

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Hadronic weak interactions from the photodisintegration of the deuteron

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  1. Hadronic weak interactions from the photodisintegration of the deuteron Chang Ho Hyun DaeguUniversity Korea Baryons 2013, Glasgow June 25, 2013

  2. Outline • Aim • Theory • Results • Prospects

  3. Aim Nucleon-nucleon interactions below pionthreshold • Strong interactions: Modern potentials (Av18, CD Bonn, Nijimegen 97, …), Effective field theories (EFTs) • Electromagnetic interactions: EM transitions • Gravitation: General relativity, neutron stars • Weak interactions: ?

  4. Weak interactions at hadronic scale DDH potential: Parity-violating (PV) one-meson exchange

  5. Issues with DDH potential • Correct form? • Missing term? • Values of the coupling constants? • Effective field theory for parity-violating NN interactions • Systematic expansion • Pionful theory • Pionless theory • Aim • Establish a consistent description of PV NN interaction with a pionless EFT

  6. Theory • Low-energy EFT p LECs p PV LECs

  7. PV interactions in the pionless EFT with dibaryons Five PV LECs • nn, pp: h0s1,2dNN • np: h0s3dNN, h0tdNN,h1dNN

  8. Observables: Polarization Pi’ in dg → pol(n)p (i=x, y, z) z’ g y’ n p si() : differential cross section with neutron spin parallel and anti-parallel along the axis i

  9. Feynman diagrams

  10. Results • Transition amplitude Parity-conserving Parity-violating

  11. Pz’ How large: Compare to the asymmetry in pol(n)p → dg at threshold • Ag(exp) = -(0.15±0.48) 10-7

  12. Px’ How large: Compare to the polarization in np → dg at threshold • Pg(exp) = (1.8±1.8) 10-7

  13. Prospects • Large Pz’, non-negligible Px’ • Ag in pol(n)p → dg: NPDGammacollaboration at SNS • Pg in pol(g)d → np: TUNL HIGS upgrade, Shanghai • Pi’ in dg→ pol(n)p: Useful for counter-determination of PV LECs

  14. Thank you.

  15. PV observables and data in the few-nucleon systems

  16. PV coupling constants can be determined from data, e.g. Asymmetry in pol(n)p capture Polarization in np capture

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