The speculation is based on a leaked internal note, said to be from physicists at the Large Hadron Collider (LHC), a 17 mile-long particle accelerator near Geneva, Switzerland.
The rumours started when an anonymous post disclosed part of the note on Columbia University mathematician Peter Woit's blog, Not Even Wrong.
While some physicists are dismissing the note as a hoax, others say the find could be a huge particle physics breakthrough in understanding the workings of the universe.
Physicist Sheldon Stone of Syracuse University said: 'If it were to be real, it would be really exciting.'
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The Higgs boson is predicted to exist by the particle physics theory known as the Standard Model. The Higgs boson, physicists believe, bestows mass on all the other particles and was crucial to forming the cosmos after the Big Bang.
It has long eluded physicists who believe it could explain why objects have mass.
Huge atom smashers — like the LHC and the Tevatron, at Fermilab in Illinois — have long been searching for the Higgs and other subatomic matter.
These accelerators slam particles together at enormous speeds, generating a shower of other particles.
The leaked note suggests that the LHC's ATLAS particle-detection experiment may have picked up a signature of the elusive Higgs.
The signal is consistent, in mass and other characteristics, with what the Higgs is expected to produce, according to the note.
Some other aspects of the signal, however, don't match predictions.
Mr Stone said: 'Its production rate is much higher than that expected for the Higgs boson in the Standard Model.'
The signal may be evidence of some other particle, Mr Stone said, adding: 'Which in some sense would be even more interesting, or it could be the result of new physics beyond the Standard Model.'
He pointed out that the note is not an official result of the ATLAS research team, so speculation about its validity or implications, therefore, may be a little premature.
Mr Stone said: 'It is actually quite illegitimate and unscientific to talk publicly about internal collaboration material before it is approved.
'So this "result" is not a result until the collaboration officially releases it.'
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Other researchers joined Mr Stone in urging patience and caution before getting too excited about the possible discovery, Fox News reports.
Caltech physicist Sean Carroll said: 'Don't worry, Higgs boson! I would never spread scurrilous rumours about you. Unlike some people.'
Some researchers have already been casting doubt on the possible detection.
Tommaso Dorigo, a particle physicist at Fermilab and CERN, which operates the LHC thinks the signal is false and will fade upon closer inspection.
Mr Dorigo points out, for example, that scientists at Fermilab didn't see the Higgs signal in their Tevatron data, which covered similar ground as the ATLAS experiment.
He feels strongly enough to put his money where his mouth is.
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