************************************************************** * * Paper : Diffractive Electroproduction of rho and phi Mesons * at HERA, DESY 09-093 * Reac : GAMMA* P --> RHO0 P(or Y) , GAMMA* P --> PHI P(or Y) * Caption : Ratios of the helicity amplitudes (taken to be purely imaginary) * and phase difference between the T11 and T00 amplitudes * (the amplitude ratios T10/T00 and T-11/T00 and the phase * difference phi01 -phi00 are taken to be 0) * for rho and phi meson production, computed from global * fits to the measurements of the 15 spin density matrix * elements, as a function of Q**2 (NPE is assumed). * ************************************************************** * * Q**2 T11/T00 stat syst+ syst- T01/T00 stat syst+ syst- T10/T00 stat syst+ syst- T-11/T00 stat syst+ syst- cos(phase) stat syst+ syst- * * GAMMA* P --> RHO0 P(or Y) * 3.1 0.786 0.019 0.036 -0.020 0.177 0.019 0.042 -0.068 -0.002 0.011 0.016 -0.005 -0.019 0.014 0.002 -0.005 0.949 0.024 0.028 -0.034 4.8 0.619 0.021 0.033 -0.018 0.169 0.022 0.051 -0.042 -0.025 0.014 0.008 -0.009 0.001 0.017 0.002 -0.005 0.882 0.035 0.028 -0.038 7.5 0.511 0.015 0.017 -0.011 0.056 0.018 0.038 -0.038 0.018 0.010 0.006 -0.005 -0.034 0.014 0.004 -0.005 0.997 0.038 0.007 -0.046 12.2 0.444 0.018 0.015 -0.008 0.106 0.022 0.035 -0.034 -0.049 0.013 0.006 -0.007 -0.038 0.017 0.009 -0.010 0.900 0.049 0.043 -0.049 23.1 0.287 0.020 0.006 -0.005 0.090 0.025 0.030 -0.029 0.047 0.016 0.003 -0.009 0.029 0.020 0.007 -0.005 0.879 0.094 0.056 -0.054 * * GAMMA* P --> PHI P(or Y) * 3.4 0.823 0.033 0.024 -0.019 0.049 0.031 0.039 -0.041 -0.027 0.020 0.015 -0.019 -0.151 0.027 0.011 -0.007 0.982 0.048 0.011 -0.070 6.6 0.580 0.029 0.014 -0.014 0.115 0.035 0.035 -0.041 -0.001 0.020 0.010 -0.009 0.076 0.026 0.005 -0.003 0.993 0.057 0.003 -0.091 15.7 0.375 0.035 0.019 -0.014 0.097 0.041 0.052 -0.073 -0.028 0.027 0.013 -0.024 0.008 0.027 0.014 -0.023 0.867 0.115 0.069 -0.051