Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: B-decay discrepancies after Moriond 2019   Following the updated measurement of the lepton flavour universality (LFU)
ratio R_K in B -> Kll decays by LHCb, as well as a number of further
measurements, e.g. R_K* by Belle and B_s -> mu mu by ATLAS, we analyse the
global status of new physics in b -> s transitions in the weak effective theory
at the b-quark scale, in the Standard Model effective theory at the electroweak
scale, and in simplified models of new physics. We find that the data continues
to strongly prefer a solution with new physics in semi-leptonic Wilson
coefficients. A purely muonic contribution to the combination C_9 = -C_10, well
suited to UV-complete interpretations, is now favoured with respect to a muonic
contribution to C_9 only. An even better fit is obtained by allowing an
additional LFU shift in C_9. Such a shift can be renormalization-group induced
from four-fermion operators above the electroweak scale, in particular from
semi-tauonic operators, able to account for the potential discrepancies in b ->
c transitions. This scenario is naturally realized in the simplified U_1
leptoquark model. We also analyse simplified models where a LFU effect in b ->
sll is induced radiatively from four-quark operators and show that such a setup
is on the brink of exclusion by LHC di-jet resonance searches.

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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph