There is no known meson with charge quantum number and strangeness or with and . Explain why in terms of the quark model.
Mesons with strangeness can have charge and those strangeness role="math" localid="1663136410092" can have charge
No meson has charge and strangeness or charge and strangeness.
The up, charm and top quarks and charge and the down, strange and bottom quarks have charge . The anti quarks have negative charges with magnitude same as those of the respective quarks. Only the strange quark has strangeness and the anti strange has strangeness. The rest of the quarks have zero strangeness.
A meson is made up of one quark and one anti-quark. For a meson to have strangeness, it must have a strange quark. The accompanying anti-quark can be anything except an anti-strange. If the anti-quark is an anti-up, anti-charm or anti-top, the net charge of the meson will be. If the anti-quark is an anti-down or anti-bottom the net charge of the meson will be. Thus, charge and strangeness is not possible.
For a meson to have strangeness, it must have an anti-strange quark. The accompanying quark can be anything except a strange quark. If the quark is a up quark, a charm or a top, the net charge of the meson will be . If the quark is a down or a bottom the net charge of the meson will be. Thus, charge and strangeness is not possible.
Question: Figure 44-12 is a hypothetical plot of the recessional speeds v of galaxies against their distance r from us; the best-fit straight line through the data points is shown. From this plot determine the age of the universe, assuming that Hubble’s law holds, and that Hubble’s constant has always had the same value.
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