Worksheet: Strangeness

In this worksheet, we will practice determining the strangeness of composite particles and sets of particles and whether given interactions conserve strangeness.

Q1:

What is the strangeness of a strange quark?

Q2:

A Ξ is a baryon with the composition uss. What is the strangeness of the Ξ?

Q3:

What is the strangeness of an electron?

Q4:

A phi meson is a particle that is made up of a strange quark and a strange antiquark. What is the strangeness of a phi meson?

Q5:

What is the strangeness of a tau neutrino?

Q6:

What is the strangeness of a charm quark?

Q7:

A Λ is a baryon with the composition uds. What is the strangeness of the Λ?

Q8:

What is the strangeness of a strange antiquark?

Q9:

The following equation shows a Xi baryon decaying into a lambda baryon and a pion, which is an interaction that does not conserve strangeness, ΞΛ𝜋̄.(dss)(uds)+(ud)

What is the total strangeness before the interaction takes place?

What is the total strangeness after the interaction takes place?

Q10:

The following equation shows a 𝜙 meson decaying into a kaon and an antikaon, 𝜙̄Κ̄Κ̄.(ss)(us)+(us)

What is the total strangeness before the interaction takes place?

What is the total strangeness after the interaction takes place?

Q11:

An Ω is a baryon that is made up of only strange quarks.

What is the strangeness of the Ω?

What is the relative electric charge of the Ω?

Q12:

The following equation shows a lambda baryon decaying into a proton and a pion, which is an interaction that does not conserve strangeness.

Λ 𝜋 ̄ ( u d s ) p ( u u d ) + ( u d ) +

What is the total strangeness before the interaction takes place?

What is the total strangeness after the interaction takes place?

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