Double exotic state productions in pion and kaon induced reactions

In the present work, we investigate the pion/kaon induced $$P_c/P_{cs}$$ P c / P cs productions with $$Z_c$$ Z c state off proton target with an effective Lagrangian approach. Our estimations indicate that the cross sections depend on the model parameters and beam energies, in particular, the cross sections for $$\pi p \rightarrow Z_c(3900) P_c(4312)$$ π p → Z c ( 3900 ) P c ( 4312 ) and $$\pi p \rightarrow Z_c(3900) P_c(4440)$$ π p → Z c ( 3900 ) P c ( 4440 ) are similar and can reach up to 10 nb, while those for $$\pi p \rightarrow Z_c(3900) P_c(4457)$$ π p → Z c ( 3900 ) P c ( 4457 ) can be 30 nb. As for $$Kp \rightarrow Z_{cs}(3985)P_c$$ K p → Z cs ( 3985 ) P c , the cross sections are about 2.5 times smaller than those for $$\pi p \rightarrow Z_c(3900) P_c$$ π p → Z c ( 3900 ) P c . The discussed processes in the present work, especially $$\pi p \rightarrow Z_c(3900) P_c(4457)$$ π p → Z c ( 3900 ) P c ( 4457 ) process, may be accessible by the high-energy pion and kaon beams in the facilities of J-PARC and COMPASS.

Exclusive production of $$\rho $$-mesons in high-energy factorization at HERA and EIC

We study cross sections for the exclusive diffractive leptoproduction of $$\rho $$ ρ -mesons, $$\gamma ^*~p~\rightarrow ~\rho ~p$$ γ ∗ p → ρ p , within the framework of high-energy factorization. Cross sections for longitudinally and transversally polarized mesons are shown. We employ a wide variety of unintegrated gluon distributions available in the literature and compare to HERA data. The resulting cross sections strongly depend on the choice of unintegrated gluon distribution. We also present predictions for the proton target in the kinematics of the Brookhaven EIC.