Speaker
Mr
Minho Kim
(Korea University/ RIKEN)
Description
Non-zero transverse single spin asymmetry, AN, of forward pi0 production in the pseudo rapidity range of 3<eta<4 has been measured by various experiments so far and usually interpreted by hard process mechanism between polarized and unpolarized proton collisions. However, no clue can be found yet if there is a potential contribution from the soft process and recently larger AN was also observed when the pi0 was detected by more diffractive-like event at STAR experiment. The measurement of AN for very forward pi0 production in the range of 6<eta by RHICf experiment will provide a new insight on the origin of the non-zero AN, particularly from the view points of diffractive and non-diffractive interactions. To measure the very forward pi0 precisely, an electro-magnetic calorimeter was newly installed at STAR and data was taken in June, 2017. High position and energy resolution of the detector make the detailed AN study with wide kinematic range possible. In this presentation, we'll report our measurement of the very forward pi0 and its current analysis status on the AN depending on transverse momentum in different longitudinal momentum fraction ranges.
Primary author
Mr
Minho Kim
(Korea University/ RIKEN)
