The particles that possesses half integral spin is

Options

A. Photon
B. Pion
C. Proton
D. K-meson

Answer

To solve the question regarding which particle possesses half integral spin, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Spin in Particles**:
- Spin is a fundamental property of particles, similar to charge or mass. It can take on integral or half-integral values.
- Particles with half-integral spin (e.g., 1/2, 3/2) are classified as fermions, while those with integral spin (e.g., 0, 1, 2) are classified as bosons.

2. **Identify the Types of Particles**:
- The question provides options: proton, pion, and k meson.
- We need to categorize these particles based on their spin characteristics.

3. **Analyze Each Option**:
- **Proton**: The proton is a baryon and has a spin of 1/2, which is a half-integral spin.
- **Pion**: The pion is a meson and has an integral spin of 0.
- **K Meson**: The K meson (kaon) is also a meson and has an integral spin of 0.

4. **Conclusion**:
- Among the given options, the only particle that possesses half-integral spin is the proton.

5. **Final Answer**:
- Therefore, the correct answer is **proton**.