Bottom Quark

Fifth quark flavor, notable for long decay lifetimes.

Core Principles & Analysis

• Discovered at Fermilab in 1977 through the Υ (Upsilon) meson.
• B mesons containing it live about 1.5 picoseconds, leaving measurable displaced vertices in detectors.
• CP violation in B meson decays was measured by the BaBar and Belle experiments in 2001.

Specifications & Metrics

• MASS: 4.18 GeV/c²
• SPIN: 1/2
• SYMBOL: b