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Gluon to $q\bar q$ antenna in anisotropic QCD matter: spin-polarized and azimuthal jet observables
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We study the production of a quark-antiquark antenna in the presence of a dense and anisotropic QCD medium. We assume the antenna to originate from an unpolarized gluon state, and consider both massless and massive final states. The medium anisotropy is captured by allowing the jet quenching coefficient to take different magnitudes in orthogonal directions with respect to the jet axis. We find that the final particle distribution is sensitive to the medium anisotropy, and more importantly, that this effect couples directly to the helicity/spin of the final states. We propose to look into these effects by performing a Fourier decomposition of the particle distribution inside the jet. In our medium model, we find that the spin independent terms contribute to the even harmonics of the cosine series. The helicity/spin dependence enters only through the sine Fourier series. We further explore the spin dependence by examining the degree of polarization of the final states in different directions. Our results indicate that the anisotropies present in the QCD matter produced in heavy ion collisions can be probed by studying azimuthal and spin observables inside jets.
Forward citations
Cited by 7 Pith papers
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Finite Formation Time Antenna Radiation: Color Spectators Break Single-Emitter BDMPS-Z
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Factorization of the triple-collinear $q \to qc\bar{c}$ splitting function at first order in opacity
At first order in opacity, the medium-modified q->q c cbar splitting function factorizes into products of q->q g and g->c cbar splitting functions in three strongly ordered collinear limits.
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Jet broadening and radiation in the early anisotropic plasma in heavy-ion collisions
The full angle-dependent jet-medium collision kernel is extracted from QCD kinetic theory for the pre-equilibrium plasma, revealing strong early-time anisotropy and up to 300% error in the isotropic splitting rates us...
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Jet quenching in out-of-equilibrium QCD matter
Medium-induced gluon radiation computed with kinetic-theory backgrounds shows a persistent, non-vanishing imprint of the pre-equilibrium stage on jet spectra, so jet observables can probe early-time dynamics in heavy-...
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Heavy-flavor energy-energy correlators isolate the gluon to heavy quark-antiquark splitting and are predicted to be sensitive to medium modifications and anisotropic quark-gluon plasma structure.
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Energy-Energy Correlator for jet production in $pp$ and $pA$ collisions
A TMD-inspired non-perturbative model plus leading-logarithm perturbative evolution describes the full angular energy-energy correlator in pp and pA jet production and attributes the observed pA suppression to medium-...
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