Speaker
Description
The interaction of jets with a droplet of QGP leads not only to modifications of the parton shower but also to modifications of the droplet itself, with both effects contributing to modifications of jets seen in a detector. Empirical determination of how the medium responds to the passage of a jet will add to what we know about the jet-medium interaction and will provide a unique window into the process of hydrodynamization.
As part (or even the whole) of a jet melts into the flowing medium, details about the orientation of the jet with respect to that of radial flow, or the time it takes for the excited hydrodynamic modes to reach the freezeout hypersurface, have a measurable effect on the distribution of the hadrons-after-freezeout that originate from the wake. Addressing the vast landscape of possible configurations of jets in medium (variation in jet fragmentation and substructure, point of origin in the flowing fluid, jet direction relative to fluid flow) in realistic models is not only necessary for a meaningful phenomenology, but also an arduously expensive computing task. In practice, one needs to compute a full 3+1D hydrodynamic evolution that includes the source terms due to the deposition of energy and momentum by the jet, with a sufficiently fine grid which captures the subtle features of the wake in the flowing fluid, for each jet.
In this talk we present a new semi-analytic method with which to reduce the computation of the wake profiles at the hypersurface to almost zero computational time after an initial investment in creating templates. It relies on a Green’s function approach where the profiles obtained for wakes evolving in pure Bjorken flow are mapped into a realistic evolution possessing radial flow by means of the appropriate set of coordinate transformations. We demonstrate that our method correctly describes the dynamics arising from any type of source configuration via explicit benchmark comparisons to full 3+1D hydrodynamics with the same source terms. This new method provides a tractable way to include realistic medium response physics in the Hybrid strong/weak coupling model, which will improve predictions for essentially every ungroomed jet-related observable, and many groomed observables, due to the overall hardening and narrowing of the distribution of hadrons from the wake as compared to that coming from a wake which does not couple to the background radial flow.
| Is this an experimental talk? | No |
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| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |