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- W2129281180 abstract "Elastic $rho^0$ photoproduction has been measured using the ZEUS detector at HERA. Untagged photoproduction events from $ep$ interactions were used to measure the reaction $gamma p rightarrow rho^0 p$ ($rho^0 rightarrow pi^+ pi^-$) at photon-proton centre-of-mass energies between 60 and 80~GeV and $|t|<0.5$~GeV$^2$, where $t$ is the square of the four-momentum transferred at the proton vertex. The differential cross section $dsigma/dM_{pipi}$, where $M_{pipi}$ is the invariant mass of the two pions, and the integrated cross section, $sigma_{gamma prightarrow rho^0 p}$, are presented; the latter was measured to be $14.7pm 0.4~(mbox{stat.})~pm2.4~(mbox{syst.})~mumbox{b}$. The differential cross section $dsigma/dt$ has an approximately exponential shape; a fit of the type $A^{prime}_{t} exp{(-b^{prime}_{t}|t| + c^{prime}_{t} t^2)}$ yields a $t$-slope $b^{prime}_{t}= 9.9~pm~1.2~(mbox{stat.})~pm 1.4~(mbox{syst.})~mumbox{b}$. The results, when compared to low energy data, show a weak energy dependence of both $sigma_{gamma prightarrow rho^0 p}$ and of the $t$-slope. The $rho^0$ is produced predominantly with transverse polarisation, demonstrating that $s$-channel helicity conservation holds at these energies." @default.
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- W2129281180 date "1995-12-01" @default.
- W2129281180 modified "2023-09-27" @default.
- W2129281180 title "Measurement of elastic $rho^0$ photoproduction at HERA" @default.
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- W2129281180 doi "https://doi.org/10.1007/s002880050004" @default.
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