Italian Prof Antonio Ereditato oversaw the results that seemed to contradict Einstein has resigned.
The head of an experiment that appeared to show subatomic particles travelling faster than the speed of light has resigned from his post.(BBC)-Prof Antonio Ereditato oversaw results that appeared to challenge Einstein's theory that nothing could travel faster than the speed of light.
Reports said some members of his group, called Opera, had wanted him to resign.
Earlier in March, a repeat experiment found that the particles, known as neutrinos, did not exceed light speed.
When the results from the Opera group at the Gran Sasso underground laboratory in Italy were first published last year, they shocked the world, threatening to upend a century of physics as well as relativity theory - which holds the speed of light to be the Universe's absolute speed limit.
The experiment involved measuring the time it took for neutrinos to travel the 730km (450 miles) from Cern laboratory in Geneva, Switzerland to the lab in Italy.