Gluon to $$\textrm{q}\overline{\textrm{q}}$$ antenna in anisotropic QCD matter: spin-polarized and azimuthal jet observables
[1];
[2];
[3]
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Universidade de Santiago de Compostela (Spain); Axencia Galega de Innovación (GAIN), Galicia (Spain)
- Universidade de Santiago de Compostela (Spain); Lab. of Instrumentation and Experimental Particle Physics (LIP), Lisbon (Portugal); Inst. of Superior Tecnico (IST), Lisbon (Portugal); Univ. of Lisbon (Portugal)
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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 2484015
- Report Number(s):
- BNL--226448-2024-JAAM
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 12 Vol. 2024; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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