The mind-boggling theory is that it will have entered from another dimension.
The theory that allows for the Higgs singlet to jump back and forth in time is called the M Theory.
This holds that we exist in a four-dimensional â€˜membraneâ€™ â€“ three dimensions of space and one of time - that floats in a 10 or 11-dimension universe.
All known forces and particles are â€˜stuckâ€™ to the 4D membrane, but experts believe that the Higgs singlet is not, and is able to â€˜diffuseâ€™ into other dimensions.
â€˜One of the attractive things about this approach to time travel is that it avoids all the big paradoxes,â€™ Mr Weiler said.
â€˜Because time travel is limited to these special particles, it is not possible for a man to travel back in time and murder one of his parents before he himself is born, for example.
'However, if scientists could control the production of Higgs singlets, they might be able to send messages to the past or future.â€™
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