2025/07/20 by Han, Chengdong, Kou, Wei, Wang, Rong +1
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #Quantum Chromodynamics and Particle Interactions #Quantum, superfluid, helium dynamics
paper · doi:10.48550/arxiv.2507.14972
openalex publication_date 2025/07/20 · openalex created_date 2025/11/11 · openalex updated_date 2026/07/28
We present a model-independent extraction of the phi-4He scattering length from near-threshold phi photoproduction on helium-4, based on LEPS Collaboration data for the coherent process gamma + 4He -> phi + 4He and the Vector Meson Dominance framework. Assuming an energy-independent differential cross section, we extract the absolute value of the phi-4He scattering length |alphaphi4He| = (3.33 +- 0.06) x 10-4 fm from a fit at threshold tthr. This value is orders of magnitude smaller than those for phi-N and phi-d scattering lengths, indicating an inverse dependence of |alphaVA| on the target nucleus mass. Our results provide new insight into the phi-nucleus interaction, supporting the notion of weak phi-nucleus coupling. We further explore the dependence of |alphaVA| on the vector meson mass, the target atom mass, and the threshold energy. An approximate exponential suppression of |alphaVA| is observed with increasing vector meson mass or target atom mass, indicating that heavier vector mesons or heavier target nuclei exhibit weaker couplings in vector meson-nucleus interactions.