Medium-Enhanced cc[over ¯] Radiation.

Area of Science:

• High Energy Physics
• Quantum Chromodynamics (QCD)
• Heavy-Ion Collisions

Background:

• High-energy particle collisions, such as those in heavy-ion experiments, involve complex interactions governed by Quantum Chromodynamics (QCD).
• Previous studies focused on jet quenching, observing suppression of high-transverse momentum (p_{T}) hadrons and jets as a signature of the quark-gluon plasma.
• Traditional jet-quenching observables may not fully capture all medium modifications within jets.

Purpose of the Study:

• To investigate the production of charm quark-antiquark (cc̄) pairs within jets in the context of heavy-ion collisions.
• To demonstrate that the established QCD formalism for jet suppression also predicts medium-enhanced cc̄ production.
• To introduce a novel observable, D0-tagged jets, for studying these medium modifications.

Main Methods:

• Utilizing the established QCD factorization formalism that successfully describes high-p_{T} hadron and jet spectra suppression.
• Applying this formalism to predict the production rates of cc̄ pairs inside jets.
• Proposing the experimental observation of D0D̄0-tagged jets as a direct signature.

Main Results:

• The QCD formalism predicts a medium-enhancement in the production of cc̄ pairs within jets.
• This enhancement is a consequence of the same physics responsible for the suppression of other high-p_{T} particles.
• The phenomenon is not accessible through standard jet-quenching measurements.

Conclusions:

• The production of cc̄ pairs in jets is sensitive to the properties of the medium created in heavy-ion collisions.
• D0D̄0-tagged jets provide a direct and novel experimental observable to study medium-induced modifications of heavy quark production.
• This finding extends our understanding of QCD dynamics in extreme nuclear environments.