Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonperturbative calculations of form factors for exclusive semileptonic
  $B_{(s)}$ decays   Precise theoretical predictions derived from the Standard Model are a key
ingredient in searches for new physics in the flavor sector. The large mass and
long lifetime of the $b$ quark make processes involving $b$ quarks of
particular interest. We use lattice simulations to perform nonperturbative QCD
calculations for semileptonic $B_{(s)}$ decays. We present results from our
determinations of $B_s\to D_s \ell \nu$ and $B_s\to K \ell \nu$ semileptonic
form factors and provide an outlook for our $B\to \pi\ell\nu$ calculation. In
addition we discuss the determination of $R$-ratios testing lepton-flavor
universality and suggest use of an improved ratio. Our calculations are based
on the set of 2+1 flavor domain wall Iwasaki gauge field configurations
generated by the RBC-UKQCD collaboration featuring three lattice spacings of
$1/a = 1.78$, $2.38$, and $2.79\,\text{GeV}$. Heavy $b$-quarks are simulated
using the relativistic heavy quark action.

13
The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: nlin