Search for a fourth-generation charge -(1/3 quark
By studying e+e- annihilations in the center-of-mass energy range between 50 and 60.8 GeV, we have established a 95%-confidence-level lower limit on the mass of a fourth-generation charge -(1/3 quark b of 27.2 GeV. In contrast with all previous searches, this limit has been obtained through consideration of the decay processes b'b and b'bg aswell as b'cW-. For the cases where any one of the three decay modes dominates, we obtain higher mass limits. © 1989 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review Letters
Eno, S., Auchincloss, P., Blanis, D., Bodek, A., Budd, H., Fry, C., Harada, H., Ho, Y., Kim, Y., Kumita, T., Mori, T., Olsen, S., Shaw, N., Sill, A., Thorndike, E., Ueno, K., Zheng, H., Imlay, R., Kirk, P., Lim, J., McNeil, R., Metcalf, W., Myung, S., Cheng, C., Gu, P., Li, J., Li, Y., Mao, Z., Xu, Y., Zhu, Y., Abashian, A., Gotow, K., & Hu, K. (1989). Search for a fourth-generation charge -(1/3 quark. Physical Review Letters, 63 (18), 1910-1913. https://doi.org/10.1103/PhysRevLett.63.1910