Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pati-Salam and lepton universality in B decays   Recent hints for lepton-flavor non-universality in $B$-meson decays can be
interpreted as hints for the existence of leptoquarks. We show that scalar
leptoquarks unavoidably arise in grand unified theories, using the well-known
Pati-Salam model as an example. These GUT-motivated leptoquarks can have a
number of appealing features including automatic absence of proton decay,
purely chiral couplings, and relations between the various leptoquark
couplings. We show that $R(K^{(*)})$ can be connected to the neutrino mass
matrix that arises via type-II seesaw, resulting in testable lepton flavor
violation. In order to also explain $R(D^{(*)})$ one instead has to assume the
existence of light right-handed neutrinos, once again with testable predictions
in other $B$-meson decays and at the LHC.

30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph