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Scientists Cast Doubt On 'Tetraquark' Discovery

By Becca Costello

Posted March 26, 2016

Physicists around the world were thrilled last month when news broke about a new type of subatomic particle-the so-called "tetraquark", an unheard-of arrangement of four quarks.

But scientists at the Large Hadron Collider near Geneva, Switzerland, looked at their own data, and they've said they've tried and failed to find concurring evidence.

The existence of the four-flavored tetraquark was posited by researchers who worked off data from a particle accelerator at Fermilab, near Chicago.

The discovery excited physicists because it offered a peek into how subatomic particles are held together.

So the news that scientists working at the LHC, the largest particle accelerator in the world, couldn't find their own tetraquark evidence was disappointing.

"We have 20 times more data than they do and we do not see any evidence of this state," says Syracuse professor Sheldon Stone, who led the analysis of the data for the LHC.

IU Physicist Daria Zieminska says for now, she's holding out hope for the tetraquark.

"There are several differences between the LHCb conditions and ours," Zieminska says.

For example, in order to study the particles, the LHC smashes different types of matter together than Fermilab does to study their decay. Thus, it's possible those conditions are more amenable to tetraquark formation than those at the LHC.

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