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How many interactions does it take to modify a jet?

Chiara Le Roux1, José Guilherme Milhano2,3, Korinna Zapp1

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Summary
This summary is machine-generated.

High-energy particle collisions in p+Pb systems show azimuthal anisotropy (v2) alongside a nuclear modification factor (RAA) near unity. This study uses the Jewel jet quenching model to explain this phenomenon, finding v2 and RAA are linked.

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Area of Science:

  • High-energy nuclear physics
  • Particle physics
  • Quantum chromodynamics

Background:

  • Investigating azimuthal anisotropy (v2) of high transverse momentum (pT) particles in proton-lead (p+Pb) collisions.
  • Addressing the apparent contradiction between sizable v2 and nuclear modification factor (RAA) near unity in small systems.
  • Understanding the role of the quark-gluon plasma (QGP) in small collision systems.

Purpose of the Study:

  • To resolve the puzzle of simultaneous observation of high-pT particle anisotropy (v2) and RAA ~ 1 in p+Pb collisions.
  • To explore the jet quenching model (Jewel) for explaining these measurements in small systems.
  • To establish a relationship between v2, RAA, and medium modification strength.

Main Methods:

  • Utilizing the Jewel jet quenching model for simulating p+Pb collisions.
  • Characterizing medium modification strength by the product of the number of scatterings per parton and the squared Debye mass.
  • Employing a simple brick medium model to study the interplay of v2 and RAA.

Main Results:

  • For small systems and moderate modifications, v2 and RAA approximately scale with the characterized medium strength.
  • A significant number of parton scatterings is required to produce measurable jet quenching effects.
  • The RAA values consistent with observed v2 can fall within experimental uncertainties.

Conclusions:

  • The study indicates no current contradiction between measured v2 and RAA in p+Pb collisions.
  • Results suggest that v2 and RAA are intrinsically linked and scale together with medium modifications.
  • Departures from scaling are observed, particularly due to inelastic energy loss, highlighting complex medium interactions.