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I believe the smallest particle known of at present is the neutrino (which translates to "small neutral one")

They have minimal interaction with other particles, with no electric charge, and a "small but non-zero mass." According to wikipedia, the mass is believed to be less than 0.3 electronvolt. An electronvolt is a unit of energy that can be used as a unit of mass in particle theory due to energy-mass equivalence (e=mc^2). By comparison, an electron weighs 511000 electronvolts, and the mass of an electron volt in conventional units is determined by the following conversion factor: 1 000 000 000 V/c2 = 1.783 × 10−27 kg

Source: wikipedia articles on neutrinos and electronvolts.

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15y ago

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