Apr 16 – 20, 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

rho^0 photoproduction and the Q^2 evolution of the shape of gold nuclei

Apr 18, 2018, 2:00 PM


WG2: Small-x and Diffraction WG2: Small-x and Diffraction


Spencer Klein (University of California Berkeley (US))


Coherent photoproduction of vector mesons is sensitive to the shape of the target nucleus, as probed at Q^2 ~ (M_V/2)^2. Previously STAR presented a high-statistics measurement of d\sigma/dt for rho^0 photoproduction in ultra-peripheral Au+Au collisions, and made a two-dimensional Fourier-Bessel (Hanckel) transformation to give the distribution of targets in the nucleus. Here, we study the Q^2 evolution of d\sigma/dt and the target distribution by dividing the rho^0 signal into three different mass bins, to see how d\sigma/dt evolves with Q^2, and see the effect on the target distribution. With increasing Q^2, we expect to see a decrease in multiple interactions, which should emphasize the interior of the nucleus cmpared to measurements at lower Q^2.

Primary author

Spencer Klein (University of California Berkeley (US))


Jana Bielcikova (Acad. of Sciences of the Czech Rep. (CZ))

Presentation materials