An antibaryon composed of two antiup quarks
and one antidown quark would have a charge of
(1) +1e (3) 0e
(2) −1e (4) −3e

1 Answer

  • Answer:

    (2) −1 e


    A quark is the lightest elementary particles which form hadron such as proton and neutron. A quark has fractional charge.

    Up, charm and top quarks have [tex]+\frac{2}{3} e[/tex] charge where as down, strange and bottom quarks have [tex] -\frac{1}{3}e[/tex] charge.

    The antiparticle of up quark is antiup quark and has charge [tex]-\frac{2}{3}e[/tex] charge.

    The antiparticle of down quark is antidown quark and has charge [tex]+\frac{1}{3}e[/tex] charge.

    An antibaryon is composed of two anti-up quark and one anti-down quark.

    Net charge of the anti-baryon is:

    [tex]2\times (-\frac{2}{3} e)+1\times (+\frac{1}{3})e=-1e[/tex]

    Thus, antibaryon has -1e charge.