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Search for the lepton-flavour violating decays B 0 → K *0 μ ± e and Bs0 → ϕμ ± e

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Abstract

Abstract A search for the lepton-flavour violating decays B0 → K*0μ±e∓ and $$ {B}_s^0 $$

                B
                s
                0
              
            → ϕμ±e∓ is presented, using proton-proton collision data collected by the LHCb detector at the LHC, corresponding to an integrated luminosity of 9 fb−1. No significant signals are observed and upper limits of$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{+}{e}^{-}\right)<5.7\times {10}^{-9}\left(6.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{-}{e}^{+}\right)<6.8\times {10}^{-9}\left(7.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{\pm }{e}^{\mp}\right)<10.1\times {10}^{-9}\left(11.7\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}_s^0\to \phi {\mu}^{\pm }{e}^{\mp}\right)<16.0\times {10}^{-9}\left(19.8\times {10}^{-9}\right)\end{array}} $$
              
                
                  
                    B
                    
                      
                        
                          B
                          0
                        
                        →
                        
                          K
                          
                            ∗
                            0
                          
                        
                        
                          μ
                          +
                        
                        
                          e
                          −
                        
                      
                    
                    <
                    5.7
                    ×
                    
                      10
                      
                        −
                        9
                      
                    
                    
                      
                        6.9
                        ×
                        
                          10
                          
                            −
                            9
                          
                        
                      
                    
                    ,
                  
                
                
                  
                    B
                    
                      
                        
                          B
                          0
                        
                        →
                        
                          K
                          
                            ∗
                            0
                          
                        
                        
                          μ
                          −
                        
                        
                          e
                          +
                        
                      
                    
                    <
                    6.8
                    ×
                    
                      10
                      
                        −
                        9
                      
                    
                    
                      
                        7.9
                        ×
                        
                          10
                          
                            −
                            9
                          
                        
                      
                    
                    ,
                  
                
                
                  
                    B
                    
                      
                        
                          B
                          0
                        
                        →
                        
                          K
                          
                            ∗
                            0
                          
                        
                        
                          μ
                          ±
                        
                        
                          e
                          ∓
                        
                      
                    
                    <
                    10.1
                    ×
                    
                      10
                      
                        −
                        9
                      
                    
                    
                      
                        11.7
                        ×
                        
                          10
                          
                            −
                            9
                          
                        
                      
                    
                    ,
                  
                
                
                  
                    B
                    
                      
                        
                          B
                          s
                          0
                        
                        →
                        ϕ
                        
                          μ
                          ±
                        
                        
                          e
                          ∓
                        
                      
                    
                    <
                    16.0
                    ×
                    
                      10
                      
                        −
                        9
                      
                    
                    
                      
                        19.8
                        ×
                        
                          10
                          
                            −
                            9
                          
                        
                      
                    
                  
                
              
            are set at 90% (95%) confidence level. These results constitute the world’s most stringent limits to date, with the limit on the decay $$ {B}_s^0 $$
              
                B
                s
                0
              
            → ϕμ±e∓ the first being set. In addition, limits are reported for scalar and left-handed lepton-flavour violating New Physics scenarios.

Description

Journal Title

Journal of High Energy Physics

Conference Name

Journal ISSN

1029-8479
1029-8479

Volume Title

Publisher

Springer Science and Business Media LLC

Rights and licensing

Except where otherwised noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/