Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lepton flavor non-universality in $b \to s \ell^+ \ell^-$ processes   We explore a scenario of New Physics entering the description of $B\to
K^{(\ast )} \mu \mu$ decay through couplings to the operators ${\cal
O}_{9,10}^\prime$, satisfying $C_9^\prime = - C_{10}^\prime$. From the current
data on ${\cal B}(B_s\to \mu\mu)$ and ${\cal B}(B\to K \mu\mu)_{[15,22]
\,\mathrm{GeV}^2}$, we obtain constraints on $\mathrm{Re} C_{10}^\prime$ and
$\mathrm{Im} C_{10}^\prime$ which we then assume to be lepton specific, and
find $R_K= {\cal B}(B\to K \mu\mu)/ {\cal B}(B\to K
ee)_{[1,6]\,\mathrm{GeV}^2}=0.88(8)$, consistent with recent value measured at
LHCb. A specific realization of this scenario is the one with a scalar
leptoquark state $\Delta$, in which $C_{10}^\prime$ is related to the mass of
$\Delta$ and its Yukawa couplings. We then show that this scenario does not
make any significant impact on $B_s-\overline B_s$ mixing amplitude nor to $
{\cal B}(B\to K\nu\bar \nu)$. Instead, it can modify $R_{K^\ast}= {\cal B}(B\to
K^\ast \mu\mu)/ {\cal B}(B\to K^\ast ee)_{[1,6]\,\mathrm{GeV}^2}$, which will
soon be experimentally measured and we find it to be $R_{K^\ast}= 1.11(8)$,
while $R_{K^\ast}/R_K= 1.27(19)$. A similar ratio of forward-backward
asymmetries also becomes lower than in the Standard Model.

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The categories of this paper are: math
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess