| new_particle_baffles_physicists | ||
| mp21k |
18 June 2004 The SELEX collaboration at Fermilab in the US has discovered a new sub-atomic particle that consists of a strange quark and a charm antiquark (arXiv.org/abs/hep-ex/0406045). In addition to being the heaviest so-called heavy-light meson ever detected, the new particle also decays in ways not predicted by theory. The results will be presented at Fermilab today. The SELEX physicists analysed data collected in proton-antiproton collisions at the Tevatron collider at Fermilab. To their surprise, they found that their new meson -- which has a mass of 2635 MeV -- had a lifetime that was three times longer than that of lighter mesons. Normally, the half life of a meson gets shorter as the mass increases. Moreover, the new meson decayed into another meson known as the eta meson six times more often than predicted by theory. http://physicsweb.org/article/news/8/6/11 |
040618 |
| ... | ||
| . |
The original news release: http://www.fnal.gov/pub/presspass/press_releases/selex_6-17.html |
040620 |