Sorry, but which particles collide with the HB to gain mass?
....
Right. Gamma (photons) are unaffected, only gravity can affect them. You can see it in the picture, the first particle from top. As you can see the top quark (
t, fourth from top) always collides with HB, hence it's the heaviest quark. While
lefthanded neutrino very slightly interacts with HB (section b in the picture), hence the lightest lepton.
Higgs postulate says that
Higgs field (which permeates entire space/vacuum) gives
all elementary subatomic particles that interact with it their mass. These particles are the 12 particles of matter see the link below
http://en.wikipedia.org/wiki/File:Standard_Model_of_Elementary_Particles.svg
6 quarks and 6 leptons - they are bricks of all matter in the universe, everything that can have mass is made of them. However, Higgs field which confers mass on quarks and leptons, causes only a tiny portion of the masses of other heavy subatomic particles, such as protons and neutrons. In these case those heavier particles acquire their mass through
gluons (strong interaction) that bind quarks together. Protons and neutrons are made of quarks.
Would it be only other particles that already have mass?
They think that
righthanded neutrinos unlike other neutrinos have a mass of their own without relying on the HB. And they are really really heavy,
ridiculously heavy. The problem is ... no one ever detected righthanded neutrinos.
Two possible explanations:
1st: Lefthanded neutrinos collide with HB and acquire mass, in this very moment for a
very short time interval they transform into righthanded neutrinos which transform back to lefthanded neutrinos which collide with HB again ... and so on. No one knows how on Earth it's possible to detect them. It's called seesaw mechanism.
and 2nd: Some physics argue that righthanded neutrinos are not trapped in 3D space in the same way that we are, rather they can move in the extra dimensions.
Seesaw vs extra dimensions. Will anyone ever find out, I don't know.
Will it ever be possible to break through the 3D space to see what happens outside.