Constraints on the mixing of a fourth family of quarks
- 1 April 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 31 (7) , 1668-1675
- https://doi.org/10.1103/physrevd.31.1668
Abstract
This paper studies the constraints on the mixing of a possible fourth family of quarks. A mixing-angle convention is introduced in which ≡sin represents to a good approximation the ij element of the quark mixing matrix (i<j). A range of parameters is found, ∼– and/or ≳, for which the contribution of the fourth family to the - mass difference is negligible yet may lead to dominant effects in the -K¯ CP-impurity parameter ε. This may be realized in a scheme in which the four quark generations are mixed mostly in pairs. A possible signature of such a scheme may be an abundant rate of same-sign dileptons at Υ(4S) if the fourth up-type quark is sufficiently heavy.
Keywords
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