Speaker
Minjung Kim
(University of California Berkeley (US))
Description
In ultra-peripheral collisions (UPCs), the photon fluctuates to a quark-antiquark dipole which then elastically scatters off the nucleus, emerging as vector meson and opposite-charge pseudoscalar meson pair. The excellent particle identification capabilities of ALICE enable the study of photoproduced pi+pi- and K+K- pairs at midrapidity in Pb--Pb collisions at √sNN = 5.02 TeV. We will present the exclusive K+K- photoproduction cross section in ALICE, measured for the first time in UPCs. We will discuss about the interference between resonance contribution of phi(1020) --> K+K- and direct pair production, obtained from a fit to the invariant mass spectrum of K+K- pairs, with comparison to the pi+pi- system.
Primary author
Minjung Kim
(University of California Berkeley (US))
