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Incoherent -mesons photoproduction from deuterons

Incoherent -mesons photoproduction from deuterons. LEPS meeting Wen-Chen Chang 05/01/2008. Outline. Physics motivation. Confusion on the normalization. Updated plots. VMD calculation from pp:  p =12-13 mb. LEPS AX T. Ishikawa et al. Physics Letters B 608 (2005) 215–222.

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Incoherent -mesons photoproduction from deuterons

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  1. Incoherent -mesons photoproduction from deuterons LEPS meeting Wen-Chen Chang 05/01/2008

  2. Outline • Physics motivation. • Confusion on the normalization. • Updated plots.

  3. VMD calculation from pp: p=12-13 mb LEPS AXT. Ishikawa et al. Physics Letters B 608 (2005) 215–222

  4. P. Mühlich, U. Mosel / Nuclear Physics A 765 (2006) 188–196 • Model calculation includes: • Fermi motion • Pauli blocking • Nuclear shadowing • Quasi elastic scattering • Pauli blocking

  5. Nuclear density effect? • Conclusion from theoretical studies: a large inelastic N cross section is required to explain the strong attenuation of  flux from nuclei beyond standard scenario. • The modification of self energy of  in finite nuclear density region is speculated to be the cause. • Measurement of  flux from deuterium, where the nuclear density effect is minimal, will be an important baseline to establish for clarifying the role.

  6. Normalization problem for events of ntag=1? Normalization factor obtained by Kohri-san using LH2 data Normalization factor obtained by Sumihama-san using LD2 data

  7. Not ntag=1 but itagc.f>0 for the use of Sumihama-san’s normalization ntag=1 Normalization factor obtained by Kohri-san using LH2 data itagc.f>0 Normalization factor obtained by Sumihama-san using LD2 data

  8. DK+K X

  9. Differential Cross Sections ofNN incoherent interaction

  10. Differential Cross Sections ofNN at t=tmin

  11. Decay asymmetry of NN at |t-tmin|<0.1 GeV2

  12. Mass Number Dependence of Nuclear Transparency ratio P dependence? KK;  mixing Strong suppression is seen in D target. Nuclear density effect is unlikely to be the main cause for the suppression.

  13. D. Cabrera et al. / Nuclear Physics A 733 (2004) 130–141 P dependence is weak in the region Of 1000-2000 MeV.

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