Incoherent -mesons photoproduction from deuterons
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Transcript of Incoherent -mesons photoproduction from deuterons
Incoherent -mesons photoproduction from deuterons
LEPS meetingWen-Chen Chang05/01/2008
Outline
Physics motivation. Confusion on the normalization. Updated plots.
LEPS AX T. Ishikawa et al. Physics Letters B 608 (2005) 215–222
VMD calculation from pp:p=12-13 mb
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
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.
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
Not ntag=1 but itagc.f>0 for the use of Sumihama-san’s normalization
ntag=1Normalization factor obtained by Kohri-san using LH2 data
itagc.f>0Normalization factor obtained by Sumihama-san using LD2 data
DK+K X
Differential Cross Sections ofNN incoherent interaction
Differential Cross Sections ofNN at t=tmin
Decay asymmetry of NN at |t-tmin|<0.1 GeV2
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.
D. Cabrera et al. / Nuclear Physics A 733 (2004) 130–141
P dependence is weak in the regionOf 1000-2000 MeV.