Angular distribution of $$ {\Lambda}_b^0\to p{K}^{-}{\ell}^{+}{\ell}^{-} $$ decays comprising Λ resonances with spin ≤ 5/2
Journal of High Energy Physics(2023)
摘要
This paper describes the angular distribution of
$$ {\Lambda}_b^0\to \Lambda \left(\to p{K}^{-}\right){\ell}^{+}{\ell}^{-} $$
decays. A full expression is given for the case of multiple interfering spin-states with spin ≤
$$ \frac{5}{2} $$
. This distribution is relevant for future measurements of
$$ {\Lambda}_b^0\to p{K}^{-}{\ell}^{+}{\ell}^{-} $$
decays, where different states cannot easily be separated based on their mass alone. New observables arise when considering spin-
$$ \frac{5}{2} $$
states as well as interference between states. An exploration of their behaviour for a variety of beyond the Standard Model scenarios shows that some of these observables exhibit interesting sensitivity to the Wilson coefficients involved in b → sℓ+ℓ− transitions. Others are insensitive to the Wilson coefficients and can be used to verify the description of
$$ {\Lambda}_b^0\to \Lambda $$
form-factors. A basis of weighting functions that can be used to determine all of the angular observables described in this paper in a moment analysis of the experimental data is also provided.
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关键词
Bottom Quarks,Rare Decays
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