# Particle Collision: What is Involved?

• zrek
The force involved may vary depending on the particles being collided, such as particles with different polarity or neutral particles. The exclusion principle may also play a role in preventing two fermions from occupying the same quantum state and causing them to scatter on each other. Overall, the exact force involved may vary, but any force that causes a quick change in the movement of particles can be considered a collision.

#### zrek

Dear members, please help me to understand clearly what we are talking about when the topic is the collision, scattering or absorption event of two particles.

It is clear that there is a "qiuck" interaction between them. Also I know that we can consider the cross section

For example let's try to collide two electrons.
What is not clear for me that what kind of force takes place when this quick change (collision) happens?

1. Electrostatic force. When they are close to each other, this force became so strong that will behave like a collision force. Clear, but is this the only force that represents the collision? And what if we try to collide particles with different polarity (proton+electron) or neutral ones?
2. Strong interaction. I assume that this is working even with neutral particles. Is this the force that is necessary to take place when we are talking about collision?
3. Exclusion principle. Maybe this prevents two fermions to occupy the same quantum state -- and by this they can't be the same place at a time, so they will scatter on each other.
4. Any of the above interactions. It doesn't matter what kind of force, if their movement changing fast by any force, we are talking about a collision.
5. Other?

Thank you!

four (4.)

## 1. What is a particle collision?

A particle collision is a type of interaction between two or more particles, such as subatomic particles or atoms, where they come into contact and exchange energy and momentum.

## 2. What is involved in a particle collision?

In a particle collision, several factors are involved including the type and energy of the particles, the distance between them, and any external forces or fields that may be present.

## 3. How are particle collisions studied?

Particle collisions are studied using specialized equipment, such as particle accelerators, that can create and control high-energy collisions. Scientists also use computer simulations and mathematical models to study the outcomes of collisions.

## 4. What is the significance of studying particle collisions?

Studying particle collisions can provide insights into the fundamental laws and forces that govern the behavior of matter and the universe. It can also help us understand the origins of the universe and develop new technologies.

## 5. Are particle collisions dangerous?

The particle collisions that occur naturally in the universe, such as cosmic rays hitting Earth's atmosphere, are not dangerous. However, collisions created in particle accelerators can produce high levels of radiation and must be carefully controlled and monitored for safety.