The M1 radiative decay width Pc(4457)(3/2-) → Pc(4312)(1/2-)γ is computed as 6.7 keV (range 2-9 keV) via 19 triangle loops with photon coupling to molecular components.
Formation of hidden-charm pentaquarks in photon-nucleon collisions
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abstract
The cross section for formation in $\gamma + p$ collisions of the recently found hidden-charm pentaquark states $P_c(4380)$ and $P_c(4450)$ is discussed and estimated. The studies of these resonances in photon beam experiments can be complementary to those in the LHCb experiment setting, and may be more advantageous for measurement of their additional decay channels. It is pointed out that both the relative importance of such decays and the yield of the resonances in the $\gamma + p$ collisions are sensitive to the internal dynamics of the pentaquarks and can resolve between theoretical models. Specific numerical estimates are discussed within a simple `baryocharmonium' model, where the the observed $P_c$ resonances are composites of $J/\psi$ and excited nucleon states with the quantum numbers of $N(1440)$ and $N(1520)$.
fields
hep-ph 2years
2026 2representative citing papers
The scalar gluonic trace form factor G_N(t) is expressed as G_{s,g}(t) + G_{s,q}(t) - σ(t)/M, linking the QCD trace anomaly to DVCS and J/ψ observables.
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Radiative decays of dynamically generated pentaquarks in the chiral unitary approach: the $P_c(4457)\to P_c(4312)\,\gamma$ transition
The M1 radiative decay width Pc(4457)(3/2-) → Pc(4312)(1/2-)γ is computed as 6.7 keV (range 2-9 keV) via 19 triangle loops with photon coupling to molecular components.
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Experimental access to the gluonic origin of the proton mass
The scalar gluonic trace form factor G_N(t) is expressed as G_{s,g}(t) + G_{s,q}(t) - σ(t)/M, linking the QCD trace anomaly to DVCS and J/ψ observables.