Correlating Bq0→μ+μ− and KL→π0νν¯ decays with four generations

The Bs→μ+μ− mode has finally been observed, albeit at rate 1.2σ below Standard Model (SM) value, while the rarer Bd0→μ+μ− decay has central value close to 4 times SM expectation but with only 2.2σ significance. The measurement of CP violating phase ϕs has finally reached SM sensitivity. Concurrent w...

Full description

Bibliographic Details
Main Authors: Wei-Shu Hou, Masaya Kohda, Fanrong Xu
Format: Article
Language:English
Published: Elsevier 2015-12-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269315008394
Description
Summary:The Bs→μ+μ− mode has finally been observed, albeit at rate 1.2σ below Standard Model (SM) value, while the rarer Bd0→μ+μ− decay has central value close to 4 times SM expectation but with only 2.2σ significance. The measurement of CP violating phase ϕs has finally reached SM sensitivity. Concurrent with improved measurements at LHC Run 2, KL→π0νν¯ and K+→π+νν¯ decays are being pursued in a similar time frame. We find, whether Bd0→μ+μ− is enhanced or not, KL→π0νν¯ can be enhanced up to the Grossman–Nir bound in the fourth generation model, correlated with some suppression of Bs→μ+μ−, and with ϕs remaining small.
ISSN:0370-2693
1873-2445