The D particle refers to either of two subatomic particles within the meson family. These particles come in two primary forms: one that is neutral and one that is positively charged.
Understanding D Particles
D particles are fundamental components studied in particle physics. As members of the meson family, they are composite subatomic particles, typically composed of a quark and an antiquark. The D particles specifically contain a charm quark (or anticharm quark).
Based on experimental observations and classifications, the two main D particles described are distinguished by their electrical charge and other intrinsic properties like mass and lifetime.
Key Properties of D Particles
The two types of D particles possess distinct masses and average lifetimes, as outlined in the reference:
| Type of D Particle | Charge | Mass (relative to electron mass) | Average Lifetime (seconds) |
|---|---|---|---|
| Neutral D particle | Neutral (0) | 3,649 times electron mass | 4.2 × 10⁻¹³ seconds |
| Charged D particle | Positive (+) | 3,658 times electron mass | 1.1 × 10⁻¹² seconds |
Characteristics at a Glance
- Family: Belong to the meson family.
- Composition: Are subatomic particles.
- Types: Exist as both neutral and positively charged variants.
- Mass: Have a significant mass, thousands of times greater than an electron.
- Lifetime: Possess extremely short average lifetimes, decaying very quickly.
These properties define the D particles and distinguish them from other subatomic particles. Studying their creation and decay provides valuable insights into the fundamental forces and building blocks of the universe.
