Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The strangest lifetime: A bizarre story of $\tau(\Omega_c^0)$   For a long time it has been established both experimentally and theoretically
that $\Omega_c^0$ is shortest-lived among the four singly charmed baryons which
decay weakly. The situation was dramatically changed in 2018 when LHCb reported
a new measurement of the $\Omega_c^0$ lifetime using semileptonic $b$-hadron
decays. The value is nearly four times larger than the previous world average
of $\tau(\Omega_c^0)$ and it is confirmed by the most recent LHCb measurement
with the prompt production. In this viewpoint article, we review the status and
point out that heavy quark expansion (HQE) fails to apply to $\Omega_c^0$ to
the order of $1/m_c^4$. By demanding a sensible HQE for $\Omega_c^0$ will lead
to a lifetime of $\Omega_c^0$ longer than $\Lambda_c^+$.

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The categories of this paper are: hep-th
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
2
The categories of this paper are: math
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th