IMPLICATIONS OF THE TOP-QUARK MASS MEASUREMENT FOR THE CKM PARAMETERS, X(S) AND CP ASYMMETRIES

被引:86
作者
ALI, A [1 ]
LONDON, D [1 ]
机构
[1] UNIV MONTREAL,PHYS NUCL LAB,MONTREAL,PQ H3C 3J7,CANADA
来源
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1995年 / 65卷 / 03期
关键词
D O I
10.1007/BF01556131
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Motivated by the recent determination of the top quark mass by the CDF collaboration, m(t) = 174 +/- 10(-12)(+13) GeV, we review and update the constraints on the parameters of the quark flavour mixing matrix V-CKM in the standard model. In performing our fits, we use inputs from the measurements of the following quantities: (i) \epsilon\, the CP-violating parameter in K decays, (ii) Delta M(d), the mass difference due to the B-d(0)-<(B-d(0))over bar> mixing, (iii) the matrix elements \V-cb\ and \V-ub\, and (iv) B-hadron lifetimes. We find that the allowed region of the unitarity triangle is very large, mostly due to theoretical uncertainties. (This emphasizes the importance of measurements of CP-violating rate asymmetries in the B system.) Nevertheless, the present data do somewhat restrict the allowed values of the coupling constant product f(Bd)root (B) over cap(Bd) and the renormalization-scale-invariant bag constant (B) over cap(K). With the updated CKM matrix we present the currently-allowed range of the ratio /V-td/V-ts/, as well as the standard model predictions for the B-s(o)-<(B-s(0))over bar> mixing parameter x(s) and the quantities sin 2 alpha, sin2 beta and sin2 gamma, which characterize the CP-asymmetries in B-decays. The ALEPH collaboration has recently reported a significant improvement on the lower limit on the B-s(o)-<(B-s(0))over bar> mass difference, Delta M(s)/Delta M(d) > 11.3 (95% C.L.). This has interesting consequences for the CKM parameters which are also worked out.
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收藏
页码:431 / 443
页数:13
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