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Hidden GeV-scale interactions of quarks.

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This study investigates new Z

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Beyond Standard Model Physics

Background:

  • The Standard Model of particle physics successfully describes fundamental particles and forces, but does not explain phenomena like dark matter or neutrino masses.
  • New gauge bosons, such as the Z' boson, are hypothetical particles predicted by extensions to the Standard Model that could mediate new interactions.

Purpose of the Study:

  • To explore quark interactions mediated by new gauge bosons (Z' bosons) within a specific mass range (0.3-50 GeV).
  • To establish constraints on the properties of these hypothetical Z' bosons, particularly their gauge couplings.

Main Methods:

  • Analysis of anomaly cancellation conditions in particle physics theories.
  • Application of collider bounds on the existence of new charged fermions.
  • Investigation of quarkonium decays and electroweak constraints.
  • Derivation of limits for a Z' boson coupled to baryon number.

Main Results:

  • A tight upper limit on the gauge coupling of light Z' bosons was determined, influenced by anomaly cancellation and collider data.
  • Quarkonium decay limits were found to be model-dependent, while electroweak constraints were relatively mild.
  • Specific limits were derived for a Z' boson interacting with baryon number.
  • A Z' boson model with relaxed constraints was constructed, permitting larger quark couplings (up to 0.2) for masses around a few GeV.

Conclusions:

  • The study provides stringent constraints on the properties of light Z' bosons, impacting theories beyond the Standard Model.
  • The derived limits are crucial for guiding future experimental searches for new gauge bosons.
  • The proposed model with relaxed constraints opens new avenues for exploring Z' boson phenomenology in particle physics experiments.