Energy Dependence of K/π, p/π, and K/p Fluctuations in Au+Au Collisions from sNN−−−√ = 7.7 to 200 GeV

see paper for full list of authorsInternational audienceA search for the quantum chromodynamics (QCD) critical point was performed by the STAR experiment at the Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. Heavy-ion collisions were studied over a large range of collision energies with homogeneous acceptance and excellent particle identification, covering a significant range in the QCD phase diagram where a critical point may be located. Dynamical K/π, p/π, and K/p fluctuations as measured by the STAR experiment in central 0-5% Au+Au collisions from center-of-mass collision energies sNN−−−√ = 7.7 to 200 GeV are presented. The observable νdyn was used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of the K/π, p/π, and K/p pairs. The energy dependences of these fluctuations from central 0-5% Au+Au collisions all demonstrate a smooth evolution with collision energy