Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark flavour observables in the Littlest Higgs model with T-parity
  after LHC Run 1   The Littlest Higgs Model with T-parity (LHT) belongs to the simplest new
physics scenarios with new sources of flavour and CP violation. We present a
new analysis of quark observables in the LHT model in view of the oncoming
flavour precision era. We use all available information on the CKM parameters,
lattice QCD input and experimental data on quark flavour observables and
corresponding theoretical calculations, taking into account new lower bounds on
the symmetry breaking scale and the mirror quark masses from the LHC. We
investigate by how much the branching ratios for a number of rare $K$ and $B$
decays are still allowed to depart from their SM values. This includes
$K^+\to\pi^+\nu\bar\nu$, $K_L\to\pi^0\nu\bar\nu$, $K_L\to \mu^+\mu^-$,
$\epsilon'/\epsilon$, $B\to X_s\gamma$, $B_{s,d}\to\mu^+\mu^-$, $B\to
K^{(*)}\ell^+\ell^-$, $B\to K^{(*)}\nu\bar\nu$. Taking into account the
constraints from $\Delta F=2$ processes, significant departures from the SM
predictions for $K^+\to\pi^+\nu\bar\nu$ and $K_L\to\pi^0\nu\bar\nu$ are
possible while the effects in $B$ decays are much smaller. In particular, the
LHT model favours $\mathcal{B}(B_{s}\to\mu^+\mu^-) \ge
\mathcal{B}(B_{s}\to\mu^+\mu^-)_{\rm SM}$, which is not supported by the data,
and the present anomalies in $B\to K^{(*)}\ell^+\ell^-$ decays cannot be
explained in this model. With the recent lattice and large $N$ input the
imposition of the $\epsilon'/\epsilon$ constraint implies a significant
suppression of the branching ratio for $K_L\to\pi^0\nu\bar\nu$ with respect to
its SM value while allowing only for small modifications for
$K^+\to\pi^+\nu\bar\nu$. Finally, we investigate how the LHT physics could be
distinguished from other models by means of indirect measurements and discuss
the consequences for quark flavour observables of not finding any LHT state in
the coming years.

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The categories of this paper are: supr-con
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
9
The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
1
The categories of this paper are: cs