Abstract
AbstractThe first observation of $$\mathcal {B}\left( B^+\rightarrow K^+\nu \nu \right) $$
B
B
+
→
K
+
ν
ν
by the Belle II experiment lies almost $$3\sigma $$
3
σ
away from the Standard Model expectation. In this letter we study this result in the SMEFT, extended by a light right-handed neutrino. We explore the correlations between the measured decay rate and other observables, such as $$\mathcal {B}\left( B\rightarrow K^*\nu \nu \right) $$
B
B
→
K
∗
ν
ν
and $$F_L\left( B\rightarrow K^*\nu \nu \right) $$
F
L
B
→
K
∗
ν
ν
, showing that they could disentangle among scenarios involving left-handed neutrinos and those with the right-handed ones. Furthermore, we find that the high-$$p_T$$
p
T
tails of Drell–Yan processes studied at LHC provide important constraints that help us exclude some of the scenarios consistent with the Belle II result.
Publisher
Springer Science and Business Media LLC