Higgses

Interesting hint that things may not be quite as simple as some thought (and maybe some support for supersymmetry?).

Hints of multiple Higgs bosons

Do enlighten. I did not spot what you mean. I have noticed the howlers journalists with inadequate scientific knowledge make sometimes, though.

Hmm. I am not sure you are entirely correct.

I would guess that electrons would be produced more than positrons, through the weak interaction (an antiproton can turn into an electron, an antineutron, and a neutrino, and a proton can turn into a positron, a neutron and an anti-neutrino, but I would expect one (the latter?) to be less common. But both of these reactions do produce one particle and one antiparticle (ignoring the neutrinos, which seems fair as they ignore us mostly). It is safe to say there is some way of producing an excess of particles even from an even mix of protons and antiprotons, since our Universe has achieved such an assymmetry from symmetric beginnings.

Collisions between quarks can surely produce things other than photons, in particular between quarks that are not antiparticles to each other.

Just because quarks collide doesn't mean they have to annihilate. Certainly that is one thing they can do. But as there are a mixture of up and down quarks and antiquarks in the two beams, clearly collisions that cannot annihilate can occur as well.

Well, bear in mind protons are merely an association of quarks bound by gluons. When  they collide, only the elementary particles that make up the protons can interact. (The relevant mesons are also, of course, bound pairs of two quarks). All the Feynmann diagrams of significance involve elementary particles.

Antimatter and matter are nothing but elementary particles, at the finest level!(which is what particle colliders are all about)

Not 100%. It seems obvious that when you collide two tremendously energetic bound collections of up and down quarks and antiquarks that sometimes you will get other things created.  I repeat, when a proton and an antiproton collide, what is actually happening is that quarks are interacting. A lot of these interactions are annihilations of quark-antiquark pairs, but not all of them are.

The ones with a quark, it's antiquark and a pair of photons are the ones relevant to annihilation, but there are others, such as those involving colour interactions between quarks (the strong force).

0.1% of pplz in world have iq of more than 145...i can only imagine I mean, wot the chances of two of these pplz actually meet in this group, its wonderful lol, it like little big bang all over, hehe