Mass: Uniting Quarks & Antimatter in Unexpected Ways

In summary, when combining matter (quarks) and antimatter, mass behaves differently than other quantum numbers. The mass adds together instead of canceling out, and anti-particles have positive mass rather than negative mass. This is due to the fact that mass is the magnitude of the energy-momentum four-vector, and energy is always positive. This concept may seem strange, but it is supported by experimental evidence.
  • #1
talanum52
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3
Homework Statement
Why does mass behave differently?
Relevant Equations
N/A
Mass behaves opposite that of other quantum numbers when combining matter (quarks) and antimatter. Why?
 
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  • #2
Is this really a homework question? In any case, the question is not clear.

What does "opposite" mean here? And mass is not a quantum number...
 
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  • #3
DrClaude said:
Is this really a homework question? In any case, the question is not clear.

What does "opposite" mean here? And mass is not a quantum number...
It adds together, rather than cancel.
 
  • #4
talanum52 said:
It adds together, rather than cancel.
Anti-particles have positive mass, not negative mass.
 
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  • #5
jbriggs444 said:
Anti-particles have positive mass, not negative mass.
Why?
 
  • #6
talanum52 said:
Why?
Because "mass" is the magnitude of the energy-momentum four-vector which is always positive.

In simpler but almost completely equivalent terms, because ##E=mc^2## (in a particle's rest frame) and energy is always positive.

And because the notion of particles that speed up when you apply a retarding force is not very sensible.

And because experiment shows that they have positive mass.
 
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  • #7
O.K. Thank you.
 
  • #8
DrClaude said:
Is this really a homework question?
No, the OP has the recent days posted several of their questions in the HW forum which actually belongs in the technical forums (some threads got deleted because of OP is working on their own model of particles.)
 
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1. What is the concept of mass in physics?

In physics, mass is defined as the amount of matter present in an object. It is a fundamental property of matter and is often measured in kilograms (kg).

2. What are quarks and how do they relate to mass?

Quarks are subatomic particles that are considered to be the building blocks of matter. They have a small amount of mass and are believed to be responsible for the mass of protons and neutrons, which make up the nucleus of an atom.

3. What is antimatter and how does it relate to mass?

Antimatter is the opposite of regular matter, with particles having the same mass but opposite charge. When matter and antimatter come into contact, they annihilate each other, releasing a large amount of energy. The existence of antimatter helps explain the concept of mass and its relationship to energy.

4. How does the concept of mass relate to the Standard Model of particle physics?

The Standard Model is a theory that describes the fundamental particles and forces that make up the universe. It includes the concept of mass and explains how particles acquire mass through interactions with the Higgs field. This theory has been supported by numerous experiments and is considered to be the most accurate description of the subatomic world.

5. What are some unexpected ways in which quarks and antimatter can be united?

One unexpected way is through the creation of exotic particles, such as tetraquarks and pentaquarks, which are composed of multiple quarks and antiquarks. Another is through the production of antihydrogen, which is made up of an antiproton and a positron (the antimatter version of an electron). These experiments help scientists better understand the nature of mass and the fundamental forces that govern our universe.

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