کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5495048 | 1528790 | 2017 | 6 صفحه PDF | دانلود رایگان |
It has been pointed out that the currently most precise determination of the weak phase Ï2=α of the Cabibbo-Kobayashi-Maskawa (CKM) matrix achieved in BâÏÏ decays is susceptible to a small correction at a level of (ÎÏ/mÏ)2 due to an I=1 amplitude caused by the Ï width. Using Breit-Wigner distributions for the two pairs of pions forming Ï mesons, we study the I=1 contribution to BâÏÏ decay rates as function of the width and location of the Ï band. We find that in the absence of a particular enhancement of the I=1 amplitude reducing a single band to a width ÎÏ at SuperKEKB leads to results which are completely insensitive to the Ï width. If the I=1 amplitude is dynamically enhanced relative to the I=0,2 amplitude one could subject its contribution to a “magnifying glass” measurement using two separated Ï bands of width ÎÏ. Subtraction of the I=1 contribution from the measured decay rate would lead to a very precise determination of the I=0,2 amplitude needed for performing the isospin analysis.
Journal: Physics Letters B - Volume 766, 10 March 2017, Pages 345-350