Photoproduction of $\pi^0$-Mesons on the Nucleon and Deuteron

The photoproduction of $\pi^0$-mesons from the nucleon and deuteron has been studied for incidents of photon energies up to 1.5 GeV. By using the MAID-2007 model for the process on the nucleon, we predict results for the unpolarized and helicity-dependent total cross sections of the semi-exclusive reaction $\gamma d\rightarrow\pi^0X$ ($X=np+d$) with the inclusion of rescattering effects. We find that rescattering effects yield a substantially large contribution. The extracted results are compared with the available experimental data and a satisfactory agreement is obtained. In addition, the contribution of $\gamma d\rightarrow\pi^0X$ ($X=np+d$) to the finite GDH integral has been evaluated by explicit integration up to 1.5 GeV and a total value of 256.96 $\mu$b has been obtained. Convergence of the GDH integral has been reached.

[1]  S. S. Al-Thoyaib,et al.  Sensitivity of γd → π0d Observables Near η-Threshold to the Intermediate ηNN Interaction and the Choice of Elementary Pion Production Amplitude , 2015 .

[2]  A. Hemmdan,et al.  Helicity-dependent reaction γd → π0d near the η-threshold and its contribution to the E-asymmetry and the GDH sum rule for the deuteron , 2015 .

[3]  A. Hemmdan,et al.  Influence of intermediate ηNN interaction on spin asymmetries for γd→π0d reaction near the η-threshold within a three-body approach , 2015 .

[4]  S. S. Al-Thoyaib,et al.  Incoherent pion photoproduction on the deuteron including polarization effects , 2011 .

[5]  M. Schwamb.  Unified description of hadronic and electromagnetic reactions of the two-nucleon system , 2010 .

[6]  D. Ryckbosch,et al.  Helicity dependence of the total inclusive cross section on the deuteron , 2009 .

[7]  E. M. Guerra,et al.  Helicity dependence and contribution to the Gerasimov-Drell-Hearn sum rule of the {gamma}-vectord-vector{yields}{pi}NN reaction channels in the energy region from threshold up to the {delta}(1232) resonance , 2007 .

[8]  L. Tiator,et al.  Unitary isobar model --MAID2007 , 2007, 0710.0306.

[9]  V. E. Tarasov,et al.  Evidence for a backward peak in the γd → π0d cross section near the η threshold , 2007, nucl-ex/0703006.

[10]  D. Ryckbosch,et al.  Measurement of the Gerasimov-Drell-Hearn Integrand for 2H from 200 to 800 MeV. , 2006, Physical review letters.

[11]  A. Loginov,et al.  Incoherent pion photoproduction on the deuteron in the first resonance region , 2006, nucl-th/0607020.

[12]  A. Fix.  Signature of the ηNN configurations in coherent πphotoproduction on the deuteron , 2005, nucl-th/0509029.

[13]  A. Fix,et al.  Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering , 2005, nucl-th/0506018.

[14]  A. Fix,et al.  Incoherent pion photoproduction on the deuteron with polarization observables. I. Formal expressions , 2005, nucl-th/0506015.

[15]  V. Burkert,et al.  Electromagnetic meson production in the nucleon resonance region , 2004, nucl-ex/0407020.

[16]  A. Fix,et al.  Spin asymmetry and Gerasimov-Drell-Hearn sum rule for the deuteron. , 2004, Physical Review Letters.

[17]  B. Krusche,et al.  Study of Non-Strange Baryon Resonances with Meson Photoproduction , 2003, nucl-ex/0306023.

[18]  E. Darwish.  Rescattering effects in incoherent photoproduction of pi-mesons off deuterium in the Delta(1232) resonance region , 2003, nucl-th/0303056.

[19]  H. Arenhövel,et al.  Influence of final-state interaction on incoherent pion photoproduction on the deuteron in the region of the Δ-resonance , 2002, nucl-th/0208030.

[20]  A. Fix,et al.  The ηNN-system at low energy within a three-body approach , 2001, nucl-th/0104032.

[21]  B. Krusche,et al.  Single and double πo-photoproduction from the deuteron , 1999 .

[22]  Koike,et al.  Separable representation of the Bonn nucleon-nucleon potential. , 1984, Physical review. C, Nuclear physics.

[23]  A. C. Hearn,et al.  EXACT SUM RULE FOR NUCLEON MAGNETIC MOMENTS , 1966 .

[24]  S. Gerasimov.  A Sum rule for magnetic moments and the damping of the nucleon magnetic moment in nuclei , 1965 .

[25]  P. Dennery.  THEORY OF THE ELECTRO- AND PHOTO-PRODUCTION OF $pi$ MESONS , 1961 .