Extraction of $\omega$n, $\omega$p and $\varphi$N scattering lengths from $\omega$ and $\varphi$ differential photoproduction cross sections on the deuterium target

Abstract

In this study, we try to extract $\omega n$, $\omega p$ and $\varphi$N scattering lengths from the differential cross-section data of near-threshold $\omega$ and $\varphi$ photoproductions not only to the energy at threshold t${}_{thr}$, but also in t to t = 0. The incoherent data of $\omega$ and $\varphi$ photoproductions on deuterium target for scattering length extractions are provided by CBELSA/TAPS Collaboration and LEPS Collaboration respectively, where the deuteron is usually approximated as a weakly bound state of a quasi-free neutron plus a quasi-free proton. Under the Vector Meson Doninance model and the assumption of energy independence of the differential cross-section, we obtained the $|{\alpha }_{\omega n^{\ast }}|$ and $|{\alpha }_{\omega p^{\ast }}|$ of loosely bound neutron and proton in the deuteron to be 0.709 $\pm$ 0.078 fm and 0.621 $\pm$ 0.022 fm respectively at threshold t${}_{thr}$ (1.258 $\pm$ 0.130 fm and 1.056 $\pm$ 0.032 fm respectively in t to t = 0) for the first time by fitting the near-threshold data of $\gamma$d $\to$ $\omega$n(p) and $\gamma$d $\to$ $\omega$p(n). For a comparison study, we also extracted the scattering length $|{\alpha }_{\omega p}|$ of the free proton from the $\omega$ photoproduction on the hydrogen target by CBELSA/TAPS Collaboration. With the near-threshold and incoherent $\varphi$ photoproduction data of $\gamma$d $\to$ $\varphi$pn by LEPS Collaboration, we obtained scattering length $|{\alpha }_{\varphi N}|$ of the bound nucleon inside the deuteron to be 0.109 $\pm$ 0.008 fm at threshold t${}_{thr}$ and 0.276 $\pm$ 0.010 fm in t to t = 0, respectively. The obtained $|{\alpha }_{\omega p}|$ and $|{\alpha }_{\varphi N}|$ are basically in agreement with the experimental indications and the theoretical predictions within the current uncertainties.

arXiv comment7 pages, 6 figures

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Cited by in corpus (2)

• Vector meson-nucleon scattering length $|{\alpha }_{VN}|$ and trace anomalous energy contribution to the nucleon mass $T_A$
• First Extraction of the $\varphi$-${}^4\mathrm{He}$ scattering length from near-threshold $\varphi$ photoproduction on helium-4