Read more: 鈥�Higgsteria: Hunting the world鈥檚 most wanted particle 鈥�
The standard model of particle physics assumes the Higgs boson is an elementary particle. But what if, rather like the proton, it is itself made up of particles?
We know the standard model is incomplete because it cannot explain all the phenomena we observe (see 鈥�Beyond Higgs: Deviant decays hint at exotic physics鈥�). Tweaking the model to make the Higgs a composite of quark-like particles, bound together by a new force, could solve this problem. It turns out that there is more than one way to arrange these new particles and forces to produce something akin to dark matter.
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To see if the boson reported last week at CERN near Geneva, Switzerland, could be such a composite, Alex Pomarol from the Autonomous University of Barcelona in Spain has started to compare decay data for the new particle with predictions of how a composite Higgs would decay inside the Large Hadron Collider. He told the in Melbourne, Australia, that the observed decays are not outside the range predicted by composite models 鈥� and that a composite Higgs is a possibility.
The idea is not new, and 鈥渋t鈥檚 not so crazy because we鈥檝e seen it all before with the proton鈥�, says , a theoretical physicist at the University of Melbourne. Although the proton was discovered near the beginning of the 20th century, it wasn鈥檛 until the 1970s that physicists realised, 鈥渙h wait a minute, the proton is not an elementary particle, it鈥檚 actually made up of other constituents鈥�, he says. These constituents are now known to be quarks and gluons.
