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For now, no particle has a mass less than zero. The Electron Neutrino for example has a mass of 0.0000079 eV (Or something like that). And the Charm quark has a mass of 1.29 GeV. Maybe you mistook it with spin or charge?

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11y ago

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What is a charm quark?

A charm quark is an elementary particle with an electrical charge of +2⁄3 e. It's a second generation up-type quark and has a mass of about 1.5 GeV/c2.


How do scientists know that the quark is the smallest unit of matter?

In the Standard Model, the quarks are not the smallest unit of matter. The leptons are, specifically the electron neutrino, Ve, with a mass of less than 2.2 eV.


Is there anything smaller than a neutrino?

Depends what you mean by "smaller." The mass of a photon is smaller than even that of a neutrino. At a sub-atomic level, concepts like "volume" or "size" become almost meaningless, so it is difficult to say whether the "size" of a neutrino is greater or less than that of, say, an electron.


Does a neutrino have mass what is it made of?

Yes, it has a mass - though the mass is quite small. As far as I know, the neutrino has not been found to have smaller parts.


What has greater mass a muon or a quark?

The muon has a mass of 105.7 MeV/c2. You have to remember that there are six different types of quarks, eachwith a different mass. The up, down, and strange have a lower mass than the muon. The charm, bottom, and top have a greater mass.


How big is a Neutrino?

A neutrino is an elementary particle and is considered to be nearly massless. Their rest mass is still not well determined, but it is known to be very small, less than 0.12 eV. In comparison, the mass of an electron is about 511,000 eV.


Are atoms the smallest particles of matter?

No. The smallest particle of matter appears to be the electron neutrino, with a mass somewhat less than 2.2 eV. Even the electron, at 511 eV, is massive, compared to the neutrino.


What is the amu of a neutrino?

Three different types of neutrinos are recognized. The latest work on the subject suggests that the combined mass of one of each type adds up to less than one billionth of an AMU.


What subatomic particale has almost no mass?

It really depends on what you mean by "almost no mass".For example: for a long time, it was thought that neutrinos might be massless. We now know their mass is not exactly zero (and that the three kinds have different masses), but we still don't know exactly what the masses are, the best we can do is say "they have to be less than (some number)." This is complicated by the fact that neutrinos undergo something called "oscillation" where they change from one kind to another, so if we could measure the mass of a neutrino, we'd actually be measuring the mass of a superposition of eigenstates.Of the neutrinos, the electron neutrino has the lowest mass, with the muon neutrino being more massive and the tau neutrino being more massive still.Photons, gluons, and the hypothetical gravitons all have an invariant mass of precisely zero.The lightest confirmed particle that isn't a neutrino and doesn't have an invariant mass of zero is the electron. The electron is probably lighter than the tau neutrino, though for the reasons described above we can't really measure the tau neutrino's mass directly.All quarks ... which can't exist in an unbound state below extremely high energy densities ... are more massive than electrons, with up quarks being the lightest at somewhere around 5 times the mass of the electron. The top quark is the most massive fundamental particle known, with more mass than most atoms(it's slightly more massive than the average thulium atom).


What are three generation of matter?

The three generations of matter refer to the classifications of fundamental particles in the Standard Model of particle physics. The first generation includes up and down quarks, and the electron, along with its associated neutrino. The second generation consists of charm and strange quarks, and the muon with its neutrino, while the third generation includes top and bottom quarks, and the tau particle along with its neutrino. Each generation has increasing mass and is less stable than the one before it, with heavier particles decaying into lighter ones.


Do muon neutrino posses mass?

unknown at this time


What is an antibottom quark?

An antibottom quark (or b-bar quark) is the antiparticle of a bottom quark. It has the same mass as a bottom quark but opposite electric charge and other quantum numbers. When a bottom quark meets an antibottom quark, they can annihilate each other and produce energy.