As CERN’s Large Hadron Collider gears up for a restart in March 2015 after a refit that doubled its particle smashing power, researchers are pondering what may come next. During its previous run scientists uncovered signals identifying the long-sought Higgs boson. Now, particle physicists have their eyes and minds on more exotic, but no less significant, particle discoveries. And — of course — these come with suitably exotic names: gluino, photino, selectron, squark, axion — the list goes on. But beyond these creative names lie possible answers to some very big questions: What is the composition of dark matter (and even dark energy)? How does gravity fit in with all the other identified forces? Do other fundamental particles exist?
From the Smithsonian:
The Large Hadron Collider, the world’s biggest and most famous particle accelerator, will reopen in March after a years-long upgrade. So what’s the first order of business for the rebooted collider? Nothing less than looking for a particle that forces physicists to reconsider everything they think they know about how the universe works.
Since the second half of the twentieth century, physicists have used the Standard Model of physics to describe how particles look and act. But though the model explains pretty much everything scientists have observed using particle accelerators, it doesn’t account for everything they can observe in the universe, including the existence of dark matter.
That’s where supersymmetry, or SUSY, comes in. Supersymmetry predicts that each particle has what physicists call a “superpartner”—a more massive sub-atomic partner particle that acts like a twin of the particle we can observe. Each observable particle would have its own kind of superpartner, pairing bosons with “fermions,” electrons with “selectrons,” quarks with “squarks,” photons with “photinos,” and gluons with “gluinos.”
If scientists could identify a single superparticle, they could be on track for a more complete theory of particle physics that accounts for strange inconsistencies between existing knowledge and observable phenomena. Scientists used the Large Hadron Collider to identify Higgs boson particles in 2012, but it didn’t behave quite as they expected. One surprise was that its mass was much lighter than predicted—an inconsistency that would be explained by the existence of a supersymmetric particle.
Scientists hope that the rebooted—and more powerful—LHC will reveal just such a particle. “Higher energies at the new LHC could boost the production of hypothetical supersymmetric particles called gluinos by a factor of 60, increasing the odds of finding it,” reports Emily Conover for Science.
If the LHC were to uncover a single superparticle, it wouldn’t just be a win for supersymmetry as a theory—it could be a step toward understanding the origins of our universe. But it could also create a lot of work for scientists—after all, a supersymmetric universe is one that would hold at least twice as many particles.
Read the entire article here.