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Area of Science:

  • High-energy particle physics
  • Quantum chromodynamics
  • Hadron spectroscopy

Background:

  • Precise measurement of fundamental parameters in particle physics is crucial for testing theoretical models.
  • Photon polarization in B meson decays offers a sensitive probe of underlying dynamics.
  • Existing methods may have limitations in precision or model dependence.

Purpose of the Study:

  • To propose and validate a novel method for measuring the photon polarization parameter in B meson decays.
  • To demonstrate the feasibility of this measurement using amplitude analysis.
  • To assess the potential precision achievable with current and future collider experiments.

Main Methods:

  • Utilized amplitude analysis of B meson decays (both charged and neutral systems).
  • Employed simplified models to simulate B -> X gamma and B -> X ll decays.
  • Validated the amplitude analysis technique and assessed model independence.

Main Results:

  • Demonstrated the feasibility of measuring the photon polarization parameter irrespective of model parameters.
  • Obtained similar sensitivities to the parameter from both charged and neutral hadronic systems.
  • Estimated statistical uncertainties of 0.009 for LHCb (9 fb^-1) and 0.018 for Belle II (5 fb^-1) under ideal conditions.

Conclusions:

  • The proposed amplitude analysis method is a viable approach for precise photon polarization measurements.
  • Future experiments at LHCb and Belle II can achieve high precision in determining this parameter.
  • These measurements will provide stringent tests of the Standard Model and probe New Physics.