B&rarr;K&eta;<sup>(')</sup> decays in the SM with fourth generation fermions

CHENG Shan; FAN Ying-Ying; XIAO Zhen-Jun

doi:10.1088/1674-1137/38/7/073102

Chinese Physics C> 2014, Vol. 38> Issue(7) : 073102 DOI: 10.1088/1674-1137/38/7/073102

B→Kη^(') decays in the SM with fourth generation fermions

1.
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China

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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%.

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CHENG Shan, FAN Ying-Ying and XIAO Zhen-Jun. B→Kη^(') decays in the SM with fourth generation fermions[J]. Chinese Physics C, 2014, 38(7): 073102. doi: 10.1088/1674-1137/38/7/073102

CHENG Shan, FAN Ying-Ying and XIAO Zhen-Jun. B→Kη^(') decays in the SM with fourth generation fermions[J]. Chinese Physics C, 2014, 38(7): 073102. doi: 10.1088/1674-1137/38/7/073102 shu

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Received: 2013-10-25
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

B→Kη^(') decays in the SM with fourth generation fermions

Corresponding author: XIAO Zhen-Jun,

1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China

Received Date: 2013-10-25
Accepted Date: 1900-01-01
Available Online: 2014-07-05

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%.