Abstract
Going beyond the simplified gluonic cascades, we introduce both gluon and quark degrees of freedom for partonic cascades inside the medium. We then solve the set of coupled evolution equations numerically with splitting kernels calculated for static, exponential, and Bjorken expanding media to arrive at medium-modified parton spectra for quark and gluon initiated jets. Using these, we calculate the inclusive jet R_mathrm {AA} where the phenomenologically driven combinations of quark and gluon jet fractions are included. Then, the rapidity dependence of the jet R_mathrm {AA} is examined. We also study the path-length dependence of jet quenching for different types of expanding media by calculating the jet v_2. Additionally, we study the sensitivity of observables on effects from nuclear modification of parton distribution functions, vacuum-like emissions in the plasma, and the time of the onset of the quenching. All calculations are compared with recently measured data.
Highlights
Not all observables have the same sensitivity to the degree of complexity implemented in the theoretical description and not the same sensitivity to the underlying physics which is modeled
The expressions for quenching factor, jet RAA, and flavor fraction in the configuration with no nuclear parton distribution functions (nPDF) effects and no vacuum-like emissions (VLE) as well as power-law parameters for simple “vacuum 1” configuration are provided in Summary of calculated pT dependence of nuclear modification factor RAA is plotted in Fig. 2 along with experimental data on measured anti-kT jets with R = 0.4 [44]
Comparison of “nPDF” and “nPDF+VLE” configuration implies that adding vacuum-like emissions to the calculation has an important impact on both the shape of RAA and its overall normalization which has an impact on the extracted values of q0
Summary
Not all observables have the same sensitivity to the degree of complexity implemented in the theoretical description and not the same sensitivity to the underlying physics which is modeled. We focus mainly on the canonical jet spectrum in lead-lead collisions at the LHC and the related nuclear modification factor, RAA These observables are mainly sensitive to the energy lost by the leading particles in the jet, due to the bias from the steeply falling hard cross-section of jet production [31]. To quantify in better detail the dependence on path length of jets, we focus on the azimuthal asymmetry of jet production quantified in the second harmonic coefficient of the jet multiplicity distribution, v2. All these observables have been analyzed in various frameworks before. Scaling behavior of splitting kernels was derived for low-x and high-x regimes in the asymptote of large times
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