B → Kη(') decays in the SM with fourth generation fermions
Abstract
By employing the perturbative QCD (pQCD) factorization approach, we calculate the new physics contributions to the four B → Kη(') decays in the Standard Model (SM) with a fourth generation of fermions (SM4), induced by the loop diagrams involving t' quark. Within the considered parameter space of the SM4 we find that: (a) the next-to-leading order (NLO) pQCD predictions for the branching ratios and CP-violating asymmetries in both the SM and SM4 generally agree with the data within one standard deviation; (b) for Br (B → Kη), the inclusion of the fourth generation contributions can improve the agreement between the theoretical predictions and the data effectively; (c) however, for Br(B → Kη') the decrease due to t' loops is disfavored by the data; and, (d) the new physics corrections to the CP-violating asymmetries of the considered decays are only about 10%.
- Publication:
-
Chinese Physics C
- Pub Date:
- July 2014
- DOI:
- 10.1088/1674-1137/38/7/073102
- arXiv:
- arXiv:1310.6805
- Bibcode:
- 2014ChPhC..38g3102C
- Keywords:
-
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 9 pages, no figure. two references added. to be published in Chinese Physics C