Observation of B(+)-->pppi+, B0-->ppK0, and B(+)-->ppK(*+)

Area of Science:

• Particle Physics
• High Energy Physics
• Quantum Chromodynamics

Background:

• Baryonic B decays provide crucial insights into the Standard Model.
• Understanding rare B decays helps probe new physics beyond the Standard Model.
• Previous studies have focused on semileptonic and non-baryonic B decays.

Purpose of the Study:

• To report the first observation of specific charmless baryonic B decays.
• To measure branching fractions for B+-->pppi(+), B0-->ppK0, and B+-->ppK(*+) decays.
• To update the branching fraction for B+-->ppK+ and set limits for B0-->ppK(*0).

Main Methods:

• Analysis of a 78 fb(-1) data sample collected with the Belle detector at KEKB.
• Utilizing data recorded on the Upsilon(4S) resonance.
• Employing techniques for identifying and reconstructing B meson decays and their products.

Main Results:

• Observed B+-->pppi(+) with a branching fraction of (3.06(+0.73)(-0.62) +/- 0.37)x10^-6.
• Measured B0-->ppK0 branching fraction as (1.88(+0.77)(-0.60) +/- 0.23)x10^-6.
• Determined B+-->ppK(*+) branching fraction to be (10.3(+3.6+1.3)(-2.8-1.7))x10^-6 and updated B+-->ppK+ to (5.66(+0.67)(-0.57) +/- 0.62)x10^-6.

Conclusions:

• The observed decay modes exhibit threshold peaking in the baryon pair invariant mass.
• These results contribute to the understanding of b-->u and b-->s transitions in baryonic B decays.
• The findings provide new data for theoretical models of B meson decays.