Xu Zhang

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20242026

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hep-ph2026

Amplitude structure of $3 \to 3$ scattering in a Mandelstam variable representation

Xu Zhang, Feng-Kun Guo

We construct a dispersive representation of the relativistic $3 \to 3$ scattering amplitude for three identical spinless particles in the $S$ -wave. The two-particle subenergy, inste…

hep-ph2026

Three-body unitary determination of the $f_{1} (1285)$ and $f_{1} (1420)$ pole positions

Tao-Ran Hu, Hai-Long Fu, Feng-Kun Guo +2

We study the $I^{G} (J^{P C}) = 0^{+} (1^{++})$ $K K ˉ π$ system in an infinite-volume three-body unitary framework, focusing on the pole content of the region of the $f_{1} (1285)$ and $f_1(…

hep-ph2026

Threshold cusp effects to measure masses of radiatively decaying hadrons: The $B_{s 0}^{*}$ mass from the $Υ ϕ$ spectrum

Hai-Long Fu, Xu Zhang, Feng-Kun Guo +3

Hadrons that decay predominantly into final states containing photons are notoriously difficult to detect at hadron colliders. Prominent examples are the yet-unobserved $B_{s 0}^{*}$ …

Amplitude structure of 3→3 scattering in a Mandelstam variable representation

Three-body unitary determination of the f1​(1285) and f1​(1420) pole positions

Threshold cusp effects to measure masses of radiatively decaying hadrons: The Bs0∗​ mass from the Υϕ spectrum

Amplitude structure of $3 \to 3$ scattering in a Mandelstam variable representation

Three-body unitary determination of the $f_{1} (1285)$ and $f_{1} (1420)$ pole positions

Threshold cusp effects to measure masses of radiatively decaying hadrons: The $B_{s 0}^{*}$ mass from the $Υ ϕ$ spectrum