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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Quantum Chromodynamics

Background:

  • B mesons are crucial for testing the Standard Model of particle physics.
  • Understanding B meson decays provides insights into fundamental forces and particle interactions.

Purpose of the Study:

  • To report the first observation of B0 -> p anti-proton D(-) and B0 -> p anti-proton D*- decays.
  • To measure the branching fractions for these newly observed decay modes.
  • To investigate the behavior of the dibaryon (p anti-proton) system in B decays.

Main Methods:

  • Analysis of a large dataset (711 fb^-1) of B anti-B pairs collected by the Belle detector at the KEKB collider.
  • Statistical analysis to establish the significance of the observed decay signals.
  • Measurement of branching fractions and comparison with theoretical predictions.

Main Results:

  • Observation of B0 -> p anti-proton D- with a statistical significance of 19.8 sigma.
  • Observation of B0 -> p anti-proton D*- with a statistical significance of 10.8 sigma.
  • Measured branching fractions: (25.1 +/- 2.6 +/- 3.5) x 10^-6 for B0 -> p anti-proton D- and (33.6 +/- 6.3 +/- 4.4) x 10^-6 for B0 -> p anti-proton D*-.
  • Results are inconsistent with generalized factorization predictions.
  • Observed threshold enhancement in the dibaryon (p anti-proton) system.

Conclusions:

  • The observed B0 decays provide new data for studying weak interactions.
  • The discrepancy with theoretical models highlights the need for refined theoretical frameworks.
  • The dibaryon system's behavior offers clues about multi-hadron interactions.