A lambda baryon \({\Lambda ^0}\) is composed of the three quarks uds. Show that the charge is 0 and the strangeness is \( - 1\).

Discuss, with reference to strangeness and baryon number, why this proposal is feasible.

Strangeness:

Baryon number:

Another interaction is

\[{\Lambda ^0} \to p + {\pi ^ - }\]

In this interaction strangeness is found not to be conserved. Deduce the nature of this interaction.

\( + \frac{2}{3} - \frac{1}{3} - \frac{1}{3} = 0\) for charge;

any particle containing a strange quark has strangeness of \( - 1\);

strangeness:

the \(p\) has a strangeness of 0;

the \({K^ - }\) particle has a strangeness of \( - 1\);

baryon number:

lambda and protons are baryons each having a baryon number of \( + 1\);

the \({K^ - }\) meson has a baryon number of 0;

only during the weak interaction strangeness is not conserved (therefore it is a weak interaction);

Well answered question, often very clearly and straightforward; some, even better candidates made mistakes in calculation in (b)(iii). SL candidates showed more difficulty with (b)(iii), often using an incorrect approach.

Well answered question, often very clearly and straightforward; some, even better candidates made mistakes in calculation in (b)(iii). SL candidates showed more difficulty with (b)(iii), often using an incorrect approach.

Well answered question, often very clearly and straightforward; some, even better candidates made mistakes in calculation in (b)(iii). SL candidates showed more difficulty with (b)(iii), often using an incorrect approach.