@article{334ddcb529f54f5ea691a8fcd864a076,
title = "New quarks and neutrino counting below the z threshold",
abstract = "The possibility is suggested of measuring the number of light neutrinos by studying heavy quarkonia decays, and qunatitative estimates are presented for the relevant decay rates.",
author = "Lawrence Krauss and Frank Wilczek",
note = "Funding Information: Because the mass of any new quarkonia states would be within a factor of two of the Z mass, weak interaction corrections can be significant \[2 ,3\] :~, and weak decays can begin to compete with other decays. For example, the expected branching ratio for decay into neutrino-antineutrino pairs, via an intermediate Z °, for a quarkonium state with mass as low as the present e'e machine energy limit (x/s=46 GeV) could be significant - up to 3% of the total width. More important, the branching ratio for this process can be comparable to that for decay into ' Also Visiting Scientist, Boston University, and Smithsonian Astrophysical Observatory. -~ Research supported in part by DOE Contract #DE-AC02-76ERO 3075, and by a Presidential Young Investigator Award. 3 Also Regents Visiting Professor, Smithsonian Astrophysical Observatory. 4 Research supported in part by NSF Grant # PHY82-17853 and by NASA. :' See however footnote 3 further on.",
year = "1986",
month = dec,
day = "4",
doi = "10.1016/0370-2693(86)90067-5",
language = "English (US)",
volume = "181",
pages = "380--384",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "3-4",
}