APS -Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students- Event - Phenomenological models of dihadron correlations on transverse rapidity from charged hadron production in Au+Au collisions at 200 GeV

摘要

Two-particle correlations on transverse momentum ($p_t$), or transverse rapidity($y_t$), provide experimental access to dynamical processes beyond that which can be studiedwith angular correlations or single-particle spectra alone. The correlations on ($y_{t1},y_{t2}$) are generated by non-statistical,event-wise fluctuations in the $y_t$ spectrum of the produced particles. Weconsider two scenarios which can produce such fluctuations:(1) a hydrodynamic picture with varying initial conditions in which the freeze-outtemperature fluctuates from event-to-event or within each event (hot and coldspots), along with fluctuations in radial flow velocity; (2) a fragmentation picture in whichthe $p_t$ distribution from soft, longitudinal color-strings fluctuates and thenumber and $Q^2$ of transversely fragmenting jets fluctuates. We show that phenomenological models based oneach scenario are capable of describing the correlation data. The fluctuation amplitudesrequired to describe the data in the respective models can be compared to thatallowed in dynamically based, theoretical models in order to either constrain or falsify those theories. Ourresults will be compared with theoretical predictions.