Aaij, R <br/><br/>
Measurement of the Ratio of Branching Fractions B(B_^→J/ψτ^ν_)/B(B_^→J/ψμ^ν_).  [electronic resource] 

 -  Physical review letters  Mar 2018 
 - 121801 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1079-7114 
<br/><br/><label>Standard No.: </label>10.1103/PhysRevLett.120.121801  doi