# Publications

## Publication Information

 Title $J/\psi$-$p$ Scattering Length from the Total and Differential Photoproduction Cross Sections Authors Lubomir Pentchev,Igor Strakovski JLAB number JLAB-PHY-20-3237 LANL number arXiv:2009.04502 Other number DOE/OR/23177-5039 Document Type(s) (Journal Article) Associated with EIC: No Supported by Jefferson Lab LDRD Funding: No Funding Source: Nuclear Physics (NP) Journal Compiled for Physical Review C Publication Abstract: The $J/\psi$-$p$ scattering length, $\alpha_{J/\psi p}$, can be extracted from the $J/\psi$ photoproduction cross section near threshold using the Vector Meson Dominance (VMD) model to relate the reaction $\gamma p \to J/\psi p$ to $J/\psi p \to J/\psi p$. Such estimates based on experimental data result in values for $|\alpha_{J/\psi p}|$, which are much lower than most of the theoretical predictions. In this work, we study the relations between the different results, depending on the use of the total or the differential cross sections, and the method of extrapolating the data to threshold in the case of a low-statistics data sample, such as the near threshold $J/\psi$ photoproduction dataset. We estimate a range for $|\alpha_{J/\psi p}|$ of $0.003$ to $0.025$~fm as extracted from experimental data within the VMD model and discuss possible reasons for such lower values compared to the theoretical results. Experiment Numbers: other Group: Hall D Document: pdf DOI: Accepted Manuscript: Supporting Documents: Supporting Datasets: