Speaker
Hee-Jin Kim
(Inha University)
Description
We present that the large single transverse spin asymmetry for the pion production in the very forward direction is diffractively produced. The differential cross section of the $p+p^\uparrow \to \pi^0+X$ can be expressed in terms of hybridized Regge amplitude and inclusive proton-baryon processes $A_{pB \to X}$. The interference of $p$ and $\Delta(1700)$ turns out to be dominant to $A_N$. In addition, the inclusive part of the differential cross section can be approximated as a triple-Regge diagram with pion exchange. Our numerical results show a good agreement with the $p_T$ and $x_F$ distribution from the RHICf experiment. The present study indicates that in the low $p_T$ region $A_N$ is of diffractive nature.
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Author
Hee-Jin Kim
(Inha University)
Co-authors
Hyun-Chul Kim
(Inha University)
Samson Clymton
(Inha University)
