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Unformatted text preview: 25. (a) Looking at the ﬁrst three lines of Table 45-5, since the particle is a baryon, we determine that it
must consist of three quarks. To obtain a strangeness of −2, two of them must be s quarks. Each
of these has a charge of −e/3, so the sum of their charges is −2e/3. To obtain a total charge of
e, the charge on the third quark must be 5e/3. There is no quark with this charge, so the particle
cannot be constructed. In fact, such a particle has never been observed.
(b) Again the particle consists of three quarks (and no antiquarks). To obtain a strangeness of zero,
none of them may be s quarks. We must ﬁnd a combination of three u and d quarks with a total
charge of 2e. The only such combination consists of three u quarks. ...
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