Showing 4 of 4 results
The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb^-1. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.
The differential cross section DSIG/DT as a function of T.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 2.0 to 2.5 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 2.5 to 3.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 3.0 to 4.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 4.0 to 5.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 5.0 to 6.5 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 6.5 to 8.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 8.0 to 11.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 11.0 to 20.0 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 2 to 3 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 3 to 5 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 5 to 10 GeV**2.
The differential cross section DSIG/DT as a function of W in the ABS(T) range 10 to 20 GeV**2.
Spin density events as a function of T.
High-statistics differential cross sections and spin density matrix elements for the reaction $\gamma p \to p \omega$ have been measured using the CLAS at Jefferson Lab for center-of-mass (CM) energies from threshold up to 2.84 GeV. Results are reported in 112 10-MeV wide CM energy bins, each subdivided into $\cos{\theta_{CM}^{\omega}}$ bins of width 0.1. These are the most precise and extensive $\omega$ photoproduction measurements to date. A number of prominent structures are clearly present in the data. Many of these have not previously been observed due to limited statistics in earlier measurements.
Differential cross section for the W range 1.72 to 1.73 GeV.
Differential cross section for the W range 1.73 to 1.74 GeV.
Differential cross section for the W range 1.74 to 1.75 GeV.
Differential cross section for the W range 1.75 to 1.76 GeV.
Differential cross section for the W range 1.76 to 1.77 GeV.
Differential cross section for the W range 1.77 to 1.78 GeV.
Differential cross section for the W range 1.78 to 1.79 GeV.
Differential cross section for the W range 1.79 to 1.80 GeV.
Differential cross section for the W range 1.80 to 1.81 GeV.
Differential cross section for the W range 1.81 to 1.82 GeV.
Differential cross section for the W range 1.82 to 1.83 GeV.
Differential cross section for the W range 1.83 to 1.84 GeV.
Differential cross section for the W range 1.84 to 1.85 GeV.
Differential cross section for the W range 1.85 to 1.86 GeV.
Differential cross section for the W range 1.86 to 1.87 GeV.
Differential cross section for the W range 1.87 to 1.88 GeV.
Differential cross section for the W range 1.88 to 1.89 GeV.
Differential cross section for the W range 1.89 to 1.90 GeV.
Differential cross section for the W range 1.90 to 1.91 GeV.
Differential cross section for the W range 1.91 to 1.92 GeV.
Differential cross section for the W range 1.92 to 1.93 GeV.
Differential cross section for the W range 1.93 to 1.94 GeV.
Differential cross section for the W range 1.94 to 1.95 GeV.
Differential cross section for the W range 1.96 to 1.97 GeV.
Differential cross section for the W range 1.97 to 1.98 GeV.
Differential cross section for the W range 1.98 to 1.99 GeV.
Differential cross section for the W range 1.99 to 2.00 GeV.
Differential cross section for the W range 2.00 to 2.01 GeV.
Differential cross section for the W range 2.01 to 2.02 GeV.
Differential cross section for the W range 2.02 to 2.03 GeV.
Differential cross section for the W range 2.03 to 2.04 GeV.
Differential cross section for the W range 2.04 to 2.05 GeV.
Differential cross section for the W range 2.05 to 2.06 GeV.
Differential cross section for the W range 2.06 to 2.07 GeV.
Differential cross section for the W range 2.07 to 2.08 GeV.
Differential cross section for the W range 2.08 to 2.09 GeV.
Differential cross section for the W range 2.09 to 2.10 GeV.
Differential cross section for the W range 2.10 to 2.11 GeV.
Differential cross section for the W range 2.11 to 2.12 GeV.
Differential cross section for the W range 2.12 to 2.13 GeV.
Differential cross section for the W range 2.13 to 2.14 GeV.
Differential cross section for the W range 2.14 to 2.15 GeV.
Differential cross section for the W range 2.15 to 2.16 GeV.
Differential cross section for the W range 2.16 to 2.17 GeV.
Differential cross section for the W range 2.17 to 2.18 GeV.
Differential cross section for the W range 2.18 to 2.19 GeV.
Differential cross section for the W range 2.19 to 2.20 GeV.
Differential cross section for the W range 2.20 to 2.21 GeV.
Differential cross section for the W range 2.21 to 2.22 GeV.
Differential cross section for the W range 2.22 to 2.23 GeV.
Differential cross section for the W range 2.23 to 2.24 GeV.
Differential cross section for the W range 2.24 to 2.25 GeV.
Differential cross section for the W range 2.25 to 2.26 GeV.
Differential cross section for the W range 2.26 to 2.27 GeV.
Differential cross section for the W range 2.27 to 2.28 GeV.
Differential cross section for the W range 2.28 to 2.29 GeV.
Differential cross section for the W range 2.29 to 2.30 GeV.
Differential cross section for the W range 2.30 to 2.31 GeV.
Differential cross section for the W range 2.31 to 2.32 GeV.
Differential cross section for the W range 2.32 to 2.33 GeV.
Differential cross section for the W range 2.33 to 2.34 GeV.
Differential cross section for the W range 2.34 to 2.35 GeV.
Differential cross section for the W range 2.35 to 2.36 GeV.
Differential cross section for the W range 2.36 to 2.37 GeV.
Differential cross section for the W range 2.37 to 2.38 GeV.
Differential cross section for the W range 2.38 to 2.39 GeV.
Differential cross section for the W range 2.39 to 2.40 GeV.
Differential cross section for the W range 2.40 to 2.41 GeV.
Differential cross section for the W range 2.41 to 2.42 GeV.
Differential cross section for the W range 2.42 to 2.43 GeV.
Differential cross section for the W range 2.43 to 2.44 GeV.
Differential cross section for the W range 2.44 to 2.45 GeV.
Differential cross section for the W range 2.45 to 2.46 GeV.
Differential cross section for the W range 2.46 to 2.47 GeV.
Differential cross section for the W range 2.47 to 2.48 GeV.
Differential cross section for the W range 2.48 to 2.49 GeV.
Differential cross section for the W range 2.49 to 2.50 GeV.
Differential cross section for the W range 2.50 to 2.51 GeV.
Differential cross section for the W range 2.51 to 2.52 GeV.
Differential cross section for the W range 2.52 to 2.53 GeV.
Differential cross section for the W range 2.53 to 2.54 GeV.
Differential cross section for the W range 2.54 to 2.55 GeV.
Differential cross section for the W range 2.55 to 2.56 GeV.
Differential cross section for the W range 2.56 to 2.57 GeV.
Differential cross section for the W range 2.57 to 2.58 GeV.
Differential cross section for the W range 2.58 to 2.59 GeV.
Differential cross section for the W range 2.59 to 2.60 GeV.
Differential cross section for the W range 2.60 to 2.61 GeV.
Differential cross section for the W range 2.61 to 2.62 GeV.
Differential cross section for the W range 2.62 to 2.63 GeV.
Differential cross section for the W range 2.63 to 2.64 GeV.
Differential cross section for the W range 2.64 to 2.65 GeV.
Differential cross section for the W range 2.65 to 2.66 GeV.
Differential cross section for the W range 2.66 to 2.67 GeV.
Differential cross section for the W range 2.67 to 2.68 GeV.
Differential cross section for the W range 2.68 to 2.69 GeV.
Differential cross section for the W range 2.69 to 2.70 GeV.
Differential cross section for the W range 2.70 to 2.71 GeV.
Differential cross section for the W range 2.71 to 2.72 GeV.
Differential cross section for the W range 2.72 to 2.73 GeV.
Differential cross section for the W range 2.75 to 2.76 GeV.
Differential cross section for the W range 2.76 to 2.77 GeV.
Differential cross section for the W range 2.77 to 2.78 GeV.
Differential cross section for the W range 2.78 to 2.79 GeV.
Differential cross section for the W range 2.79 to 2.80 GeV.
Differential cross section for the W range 2.80 to 2.81 GeV.
Differential cross section for the W range 2.81 to 2.82 GeV.
Differential cross section for the W range 2.82 to 2.83 GeV.
Differential cross section for the W range 2.83 to 2.84 GeV.
Spin density matrix elements for the W range 1.72 to 1.73 GeV.
Spin density matrix elements for the W range 1.73 to 1.74 GeV.
Spin density matrix elements for the W range 1.74 to 1.75 GeV.
Spin density matrix elements for the W range 1.75 to 1.76 GeV.
Spin density matrix elements for the W range 1.76 to 1.77 GeV.
Spin density matrix elements for the W range 1.77 to 1.78 GeV.
Spin density matrix elements for the W range 1.78 to 1.79 GeV.
Spin density matrix elements for the W range 1.79 to 1.80 GeV.
Spin density matrix elements for the W range 1.80 to 1.81 GeV.
Spin density matrix elements for the W range 1.81 to 1.82 GeV.
Spin density matrix elements for the W range 1.82 to 1.83 GeV.
Spin density matrix elements for the W range 1.83 to 1.84 GeV.
Spin density matrix elements for the W range 1.84 to 1.85 GeV.
Spin density matrix elements for the W range 1.85 to 1.86 GeV.
Spin density matrix elements for the W range 1.86 to 1.87 GeV.
Spin density matrix elements for the W range 1.87 to 1.88 GeV.
Spin density matrix elements for the W range 1.88 to 1.89 GeV.
Spin density matrix elements for the W range 1.89 to 1.90 GeV.
Spin density matrix elements for the W range 1.90 to 1.91 GeV.
Spin density matrix elements for the W range 1.91 to 1.92 GeV.
Spin density matrix elements for the W range 1.92 to 1.93 GeV.
Spin density matrix elements for the W range 1.93 to 1.94 GeV.
Spin density matrix elements for the W range 1.94 to 1.95 GeV.
Spin density matrix elements for the W range 1.95 to 1.96 GeV.
Spin density matrix elements for the W range 1.96 to 1.97 GeV.
Spin density matrix elements for the W range 1.97 to 1.98 GeV.
Spin density matrix elements for the W range 1.98 to 1.99 GeV.
Spin density matrix elements for the W range 1.99 to 2.00 GeV.
Spin density matrix elements for the W range 2.00 to 2.01 GeV.
Spin density matrix elements for the W range 2.01 to 2.02 GeV.
Spin density matrix elements for the W range 2.02 to 2.03 GeV.
Spin density matrix elements for the W range 2.03 to 2.04 GeV.
Spin density matrix elements for the W range 2.04 to 2.05 GeV.
Spin density matrix elements for the W range 2.05 to 2.06 GeV.
Spin density matrix elements for the W range 2.06 to 2.07 GeV.
Spin density matrix elements for the W range 2.07 to 2.08 GeV.
Spin density matrix elements for the W range 2.08 to 2.09 GeV.
Spin density matrix elements for the W range 2.09 to 2.10 GeV.
Spin density matrix elements for the W range 2.10 to 2.11 GeV.
Spin density matrix elements for the W range 2.11 to 2.12 GeV.
Spin density matrix elements for the W range 2.12 to 2.13 GeV.
Spin density matrix elements for the W range 2.13 to 2.14 GeV.
Spin density matrix elements for the W range 2.14 to 2.15 GeV.
Spin density matrix elements for the W range 2.15 to 2.16 GeV.
Spin density matrix elements for the W range 2.16 to 2.17 GeV.
Spin density matrix elements for the W range 2.17 to 2.18 GeV.
Spin density matrix elements for the W range 2.18 to 2.19 GeV.
Spin density matrix elements for the W range 2.19 to 2.20 GeV.
Spin density matrix elements for the W range 2.20 to 2.21 GeV.
Spin density matrix elements for the W range 2.21 to 2.22 GeV.
Spin density matrix elements for the W range 2.22 to 2.23 GeV.
Spin density matrix elements for the W range 2.23 to 2.24 GeV.
Spin density matrix elements for the W range 2.24 to 2.25 GeV.
Spin density matrix elements for the W range 2.25 to 2.26 GeV.
Spin density matrix elements for the W range 2.26 to 2.27 GeV.
Spin density matrix elements for the W range 2.27 to 2.28 GeV.
Spin density matrix elements for the W range 2.28 to 2.29 GeV.
Spin density matrix elements for the W range 2.29 to 2.30 GeV.
Spin density matrix elements for the W range 2.30 to 2.31 GeV.
Spin density matrix elements for the W range 2.31 to 2.32 GeV.
Spin density matrix elements for the W range 2.32 to 2.33 GeV.
Spin density matrix elements for the W range 2.33 to 2.34 GeV.
Spin density matrix elements for the W range 2.34 to 2.35 GeV.
Spin density matrix elements for the W range 2.35 to 2.36 GeV.
Spin density matrix elements for the W range 2.36 to 2.37 GeV.
Spin density matrix elements for the W range 2.37 to 2.38 GeV.
Spin density matrix elements for the W range 2.38 to 2.39 GeV.
Spin density matrix elements for the W range 2.39 to 2.40 GeV.
Spin density matrix elements for the W range 2.40 to 2.41 GeV.
Spin density matrix elements for the W range 2.41 to 2.42 GeV.
Spin density matrix elements for the W range 2.42 to 2.43 GeV.
Spin density matrix elements for the W range 2.43 to 2.44 GeV.
Spin density matrix elements for the W range 2.44 to 2.45 GeV.
Spin density matrix elements for the W range 2.45 to 2.46 GeV.
Spin density matrix elements for the W range 2.46 to 2.47 GeV.
Spin density matrix elements for the W range 2.47 to 2.48 GeV.
Spin density matrix elements for the W range 2.48 to 2.49 GeV.
Spin density matrix elements for the W range 2.49 to 2.50 GeV.
Spin density matrix elements for the W range 2.50 to 2.51 GeV.
Spin density matrix elements for the W range 2.51 to 2.52 GeV.
Spin density matrix elements for the W range 2.52 to 2.53 GeV.
Spin density matrix elements for the W range 2.53 to 2.54 GeV.
Spin density matrix elements for the W range 2.54 to 2.55 GeV.
Spin density matrix elements for the W range 2.55 to 2.56 GeV.
Spin density matrix elements for the W range 2.56 to 2.57 GeV.
Spin density matrix elements for the W range 2.57 to 2.58 GeV.
Spin density matrix elements for the W range 2.58 to 2.59 GeV.
Spin density matrix elements for the W range 2.59 to 2.60 GeV.
Spin density matrix elements for the W range 2.60 to 2.61 GeV.
Spin density matrix elements for the W range 2.61 to 2.62 GeV.
Spin density matrix elements for the W range 2.62 to 2.63 GeV.
Spin density matrix elements for the W range 2.63 to 2.64 GeV.
Spin density matrix elements for the W range 2.64 to 2.65 GeV.
Spin density matrix elements for the W range 2.65 to 2.66 GeV.
Spin density matrix elements for the W range 2.66 to 2.67 GeV.
Spin density matrix elements for the W range 2.67 to 2.68 GeV.
Spin density matrix elements for the W range 2.68 to 2.69 GeV.
Spin density matrix elements for the W range 2.69 to 2.70 GeV.
Spin density matrix elements for the W range 2.70 to 2.71 GeV.
Spin density matrix elements for the W range 2.71 to 2.72 GeV.
Spin density matrix elements for the W range 2.72 to 2.73 GeV.
Spin density matrix elements for the W range 2.73 to 2.74 GeV.
Spin density matrix elements for the W range 2.74 to 2.75 GeV.
Spin density matrix elements for the W range 2.75 to 2.76 GeV.
Spin density matrix elements for the W range 2.76 to 2.77 GeV.
Spin density matrix elements for the W range 2.77 to 2.78 GeV.
Spin density matrix elements for the W range 2.78 to 2.79 GeV.
Spin density matrix elements for the W range 2.79 to 2.80 GeV.
Spin density matrix elements for the W range 2.80 to 2.81 GeV.
Spin density matrix elements for the W range 2.81 to 2.82 GeV.
Spin density matrix elements for the W range 2.82 to 2.83 GeV.
Spin density matrix elements for the W range 2.83 to 2.84 GeV.
The exclusive reaction $\gamma p \to p \pi^+ \pi^-$ was studied in the photon energy range 3.0 - 3.8 GeV and momentum transfer range $0.4<-t<1.0$ GeV$^2$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range the integrated luminosity was about 20 pb$^{-1}$. The reaction was isolated by detecting the $\pi^+$ and proton in CLAS, and reconstructing the $\pi^-$ via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the $S$, $P$, and $D$-waves in the $M_{\pi^+\pi^-}$ mass range $0.4-1.4$ GeV were derived performing a partial wave expansion of the extracted moments. Besides the dominant contribution of the $\rho(770)$ meson in the $P$-wave, evidence for the $f_0(980)$ and the $f_2(1270)$ mesons was found in the $S$ and $D$-waves, respectively. The differential production cross sections $d\sigma/dt$ for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the $f_0(980)$ has been measured in a photoproduction experiment.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=00) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=10) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=11) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=20) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=21) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=22) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=30) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=31) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=32) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=33) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=40) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=41) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=42) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=43) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
Moments YLM(LM=44) of the di-pion angular distribution for -T.
S wave cross section for -T.
S wave cross section for -T.
S wave cross section for -T.
S wave cross section for -T.
S wave cross section for -T.
S wave cross section for -T.
P wave cross section for -T.
P wave cross section for -T.
P wave cross section for -T.
P wave cross section for -T.
P wave cross section for -T.
P wave cross section for -T.
Pm wave cross section for -T.
Pm wave cross section for -T.
Pm wave cross section for -T.
Pm wave cross section for -T.
Pm wave cross section for -T.
Pm wave cross section for -T.
P0 wave cross section for -T.
P0 wave cross section for -T.
P0 wave cross section for -T.
P0 wave cross section for -T.
P0 wave cross section for -T.
P0 wave cross section for -T.
Pp wave cross section for -T.
Pp wave cross section for -T.
Pp wave cross section for -T.
Pp wave cross section for -T.
Pp wave cross section for -T.
Pp wave cross section for -T.
D wave cross section for -T.
D wave cross section for -T.
D wave cross section for -T.
D wave cross section for -T.
D wave cross section for -T.
D wave cross section for -T.
Dm wave cross section for -T.
Dm wave cross section for -T.
Dm wave cross section for -T.
Dm wave cross section for -T.
Dm wave cross section for -T.
Dm wave cross section for -T.
D0 wave cross section for -T.
D0 wave cross section for -T.
D0 wave cross section for -T.
D0 wave cross section for -T.
D0 wave cross section for -T.
D0 wave cross section for -T.
Dp wave cross section for -T.
Dp wave cross section for -T.
Dp wave cross section for -T.
Dp wave cross section for -T.
Dp wave cross section for -T.
Dp wave cross section for -T.
F wave cross section for -T.
F wave cross section for -T.
F wave cross section for -T.
F wave cross section for -T.
F wave cross section for -T.
F wave cross section for -T.
Fm wave cross section for -T.
Fm wave cross section for -T.
Fm wave cross section for -T.
Fm wave cross section for -T.
Fm wave cross section for -T.
Fm wave cross section for -T.
F0 wave cross section for -T.
F0 wave cross section for -T.
F0 wave cross section for -T.
F0 wave cross section for -T.
F0 wave cross section for -T.
F0 wave cross section for -T.
Fp wave cross section for -T.
Fp wave cross section for -T.
Fp wave cross section for -T.
Fp wave cross section for -T.
Fp wave cross section for -T.
Fp wave cross section for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the P-wave for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Spin density matrix elements for the interference between the S- and P-waves for -T.
Exclusive electroproduction of $\phi$ mesons has been studied in $e^\pm p$ collisions at $\sqrt{s}=318 \gev$ with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb$^{-1}$. The $\gamma^*p$ cross section is presented in the kinematic range $2<Q^2<70 \gev^2$, $35<W<145 \gev$ and ${|t|}<0.6 \gev^2$. The cross sections as functions of $Q^2$, $W$, $t$ and helicity angle $\theta_h$ are compared to cross sections for other vector mesons. The ratios $R$ of the cross sections for longitudinally and transversely polarized virtual photons are presented as functions of $Q^2$ and $W$. The data are also compared to predictions from theoretical models.
Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 2 to 3 GeV**2.
Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 3 to 5 GeV**2.
Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 5 to 9 GeV**2.
Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 9 to 30 GeV**2.
Parameter of the fit SIG of the form W**POWER as a function of Q**2.
Exclusive GAMMA* P --> PHI P cross section as a function of Q**2 for W=75 GeV.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=2.4 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=3.6 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=5.2 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=6.9 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=9.2 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=12.6 GeV**2.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV at Q**2=19.7 GeV**2.
The slope parameter and DSIG/DT at T=0 for the exclusive reaction GAMMA* P --> PHI P at W=75 GeV.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P as a function of W at Q**2=5 GeV**2 and ABS(T) = 0.73 GeV**2.. Error is combined statistics and systematics.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P as a function of W at Q**2=5 GeV**2 and ABS(T) = 0.45 GeV**2.. Error is combined statistics and systematics.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P as a function of W at Q**2=5 GeV**2 and ABS(T) = 0.25 GeV**2.. Error is combined statistics and systematics.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P as a function of W at Q**2=5 GeV**2 and ABS(T) = 0.12 GeV**2.. Error is combined statistics and systematics.
Differential DSIG/DT distribution for the exclusive reaction GAMMA* P --> PHI P as a function of W at Q**2=5 GeV**2 and ABS(T) = 0.025 GeV**2.. Error is combined statistics and systematics.
The parameter of the fit SIG of the form W**POWER as a function of T. From this the pomeron trajectory can be calculated a(1+POWER/4).
The spin density matrix element R04_00 and ratios of longitudinal and transversely polarized photons as a function of Q**2.
The spin density matrix element R04_00 and ratios of longitudinal and transversely polarized photons as a function of W for the Q**2 region 2 to 5 GeV**2.
The spin density matrix element R04_00 and ratios of longitudinal and transversely polarized photons as a function of W for the Q**2 region 5 to 20 GeV**2.
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