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Observation of B(+/-) --> p(-)pK(+/-).

K Abe1, K Abe, R Abe

  • 1Aomori University, Aomori, Japan.

Physical Review Letters
|May 15, 2002
PubMed

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Summary
This summary is machine-generated.

Researchers observed a new B meson decay, B(+/-) to proton-antiproton-kaon, a first for b to s transitions with final-state baryons. This finding provides insights into particle physics and rare B meson decays.

Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • B mesons are crucial for studying CP violation and new physics beyond the Standard Model.
  • Understanding rare B meson decays provides stringent tests of the Standard Model.
  • Baryonic B decays are less explored but offer unique insights into hadron structure and dynamics.

Purpose of the Study:

  • To report the first observation of the B(+/-) --> p(-)pK(+/-) decay mode.
  • To measure the branching fraction for this rare decay.
  • To investigate the proton-antiproton invariant mass spectrum and set limits on related decays.

Main Methods:

  • Analysis of 29.4 fb(-1) of data collected by the Belle detector at the KEKB collider.
  • Identification of B(+/-) mesons and their decay products, specifically protons, antiprotons, and kaons.

Related Experiment Videos

  • Statistical analysis to determine the significance of the signal and measure the branching fraction.

    • Main Results:

    • Observation of the B(+/-) --> p(-)pK(+/-) decay, a novel b --> s transition involving final-state baryons.
    • The measured branching fraction is B(B+/--->p(-)pK+/-) = [4.3(+1.1)(-0.9)(stat)+/-0.5(syst)]x 10(-6).
    • The p(-)p mass spectrum is peaked at low mass, deviating from phase space expectations.

    Conclusions:

    • The observed decay provides the first evidence of a b --> s transition with baryons in the final state.
    • The results offer new opportunities to study non-leptonic weak decays and hadron spectroscopy.
    • Upper limits were set for B(0)-->p(-)pK(S) and B(+/-)-->p(-)p pi(+/-) decays, constraining new physics scenarios.