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Study of J/ψ Production in Jets.

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This study measured J/ψ (J/psi) meson production in jets from proton-proton collisions. Prompt J/ψ production fractions in jets did not match theoretical predictions, indicating a need for improved models.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • J/ψ mesons are important probes of the strong interaction.
  • Understanding J/ψ production in jets is crucial for testing Quantum Chromodynamics (QCD) theories.
  • Previous studies have explored J/ψ production, but measurements in the forward region of jets are limited.

Purpose of the Study:

  • To measure the transverse momentum fraction, z(J/ψ), carried by J/ψ mesons within jets in the LHCb detector's forward region.
  • To compare the measured J/ψ production distributions with theoretical predictions from nonrelativistic QCD.
  • To investigate the production mechanisms of prompt versus b-hadron-decay-produced J/ψ mesons in jets.

Main Methods:

  • Analysis of proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb detector.
  • Selection of jets with transverse momentum p_{T}(jet) > 20 GeV within the pseudorapidity range 2.5 < η(jet) < 4.0.
  • Measurement of the differential cross-section of J/ψ mesons as a function of z(J/ψ) = p_{T}(J/ψ)/p_{T}(jet).

Main Results:

  • The distribution of z(J/ψ) for J/ψ mesons originating from b-hadron decays aligns with theoretical expectations.
  • A significant discrepancy is observed between the measured and predicted z(J/ψ) distributions for prompt J/ψ mesons.
  • This marks the first measurement of the prompt J/ψ meson p_{T} fraction within jets.

Conclusions:

  • The agreement for b-hadron-decay J/ψ mesons suggests the underlying production mechanism is well-understood.
  • The disagreement for prompt J/ψ mesons highlights limitations in current fixed-order nonrelativistic QCD calculations.
  • Further theoretical development is required to accurately describe prompt J/ψ production in jets.