Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $\Lambda_b\to\Lambda^\ast(1520)(\to N\!\bar{K})\ell^+\ell^-$ decay
  at low-recoil in HQET   In this paper we discuss the Standard Model and new physics sensitivity of
the $\Lambda_b\to\Lambda^\ast(1520)(\to N\!\bar{K})\ell^+\ell^-$ decay at
low-recoil, where $\ell^\pm$ are massive leptons and $N\!\bar{K}=\{pK^-,
n\bar{K}^0 \}$. We provide a full angular distribution with a set of operators
that includes the Standard Model operators and their chirality flipped
counterparts, and new scalar and pseudo-scalar operators. The resulting angular
distribution allows us to construct observables that we study in the Standard
Model and in model-independent new physics scenarios. To reduce the hadronic
effects emanating from the $\Lambda_b\to\Lambda^\ast(1520)$ transition form
factors, we exploit the Heavy Quark Effective theory framework valid at low
$\Lambda^\ast(1520)$ recoil, \emph{i.e.,} large dilepton invariant mass squared
$q^2\sim \mathcal{O}(m_b^2)$. Working to the leading order in $1/m_b$ and
including $\mathcal{O}(\alpha_s)$ corrections, we compute the `improved
Isgur-Wise relations' between the form factors. The relations correlate the
form factors and thereby allow the description of this decay at the low-recoil
region with a smaller number of independent form factors.

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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph