How sensitive to FCNC can B0 CP asymmetries be?

被引：41

作者：

Barenboim, G ^{[1
]}

Botella, FJ

Branco, GC

Vives, O

机构：

[1] Univ Valencia, Dept Fis Teor, E-46100 Burjassot, Valencia, Spain

[2] Univ Valencia, CSIC, Ctr Mixte, IFIC, E-46100 Burjassot, Valencia, Spain

[3] CERN, Div Theory, CH-1211 Geneva, Switzerland

[4] Inst Super Tecn, CFIF, IST, P-1096 Lisbon, Portugal

[5] Inst Super Tecn, Dept Fis, P-1096 Lisbon, Portugal

来源：

PHYSICS LETTERS B | 1998年 / 422卷 / 1-4期

关键词：

D O I：

10.1016/S0370-2693(97)01515-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We show that the study of CP asymmetries in neutral B-meson decays provides a very sensitive probe of flavour-changing neutral currents (FCNC). We introduce two new angles, alpha(SM) and beta(SM), whose main feature is that they can be readily obtained from the measurement of the CP asymmetries a(J/psi Ki), a(pi+pi-) and the ratio R-u = \VudVub*\/\VcdVcb*\, providing a quantitative test of the presence of new physics in a model-independent way. Assuming that new physics is due to the presence of an isosinglet down-type quark, we indicate how to reconstruct the unitarity quadrangles and point out that the measurements of the above asymmetries, within the expected experimental errors, may detect FCNC effects, even for values of \Sigma(i=1)(3)V(id)V(ib)*/(VtdVtb*)\ at the level of a few times 10(-2). (C) 1998 Published by Elsevier Science B.V.

引用

页码：277 / 286

页数：10

共 26 条

[21]

GROSSMAN Y, 1997, IN PRESS ADV SERIES

[22] EFFECTS OF SUPERHEAVY QUARKS AND LEPTONS IN LOW-ENERGY WEAK PROCESSES KAPPA-L-]MU-MU,KAPPA+-]PI+NU-NUBAR AND KAPPA-0]-]KAPPA-BAR-0 [J].