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Evidence for CP violation in B+ → ppK+ decays.

R Aaij¹, B Adeva², M Adinolfi³

¹Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.

Physical Review Letters

|October 18, 2014

Summary

This summary is machine-generated.

Researchers observed CP violation in B+ to ppK+ decays, a significant finding for baryonic final states. This study also measured forward-backward asymmetry and branching fractions for related B+ decays.

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Area of Science:

Particle Physics
High-Energy Physics
Quantum Chromodynamics

Background:

The Standard Model of particle physics describes fundamental particles and forces.
B meson decays provide a rich laboratory for testing the Standard Model and searching for new physics.
Understanding CP violation in baryonic decays is crucial for explaining the matter-antimatter asymmetry in the universe.

Purpose of the Study:

To investigate three-body decays of the B+ meson, specifically B+ → ppK+ and B+ → ppπ+.
To search for and measure CP violation in these decays, particularly in the B+ → ppK+ channel.
To measure the forward-backward asymmetry of the light meson and the branching fraction of B+ → Λ(1520)p.

Main Methods:

Analysis of a large dataset (3.0 fb⁻¹) from proton-proton collisions at 7 and 8 TeV collected by the LHCb experiment.
Selection and reconstruction of B+ → ppK+ and B+ → ppπ+ decay candidates.
Phase-space dependent measurements of asymmetries and branching fractions.

Main Results:

Evidence of CP violation was found in the B+ → ppK+ decay within specific phase-space regions.
The first measurement of CP violation in a baryonic final state was achieved.
Forward-backward asymmetry measurements: A(FB)(ppK+, m(pp)<2.85 GeV/c²) = 0.495 ± 0.012 (stat) ± 0.007 (syst) and A(FB)(ppπ+, m(pp)<2.85 GeV/c²) = -0.409 ± 0.033 (stat) ± 0.006 (syst).
The branching fraction for B+ → Λ(1520)p was measured as (3.15 ± 0.48 (stat) ± 0.07 (syst) ± 0.26 (BF)) × 10⁻⁷.

Conclusions:

The observation of CP violation in B+ → ppK+ decays opens new avenues for studying this phenomenon in baryonic systems.
These measurements provide valuable data for theoretical models aiming to explain CP violation and the matter-antimatter asymmetry.
The precise measurement of branching fractions contributes to a more comprehensive understanding of B meson decay modes.