Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of $\psi(3686) \to K^{-} \Lambda \bar{\Xi}^{+} +c.c.$ and
  $\psi(3686) \to \gamma K^{-} \Lambda \bar{\Xi}^{+} +c.c$   Using a sample of $1.06\times10^8\ \psip$ events produced in $e^+e^-$
collisions at $\sqrt{s}$ = 3.686 GeV and collected with the BESIII detector at
the BEPCII collider, we present studies of the decays $\klx+c.c.$ and
$\gklx+c.c.$. We observe two hyperons, $\Xi(1690)^-$ and $\Xi(1820)^-$, in the
$K^-\Lambda$ invariant mass distribution in the decay $\klx+c.c.$ with
significances of $4.9 \sigma$ and $6.2 \sigma$, respectively. The branching
fractions of $\klx+c.c.$, $\ksx+c.c.$, $\psip\to\gamma \chi_{cJ}\to \gamma K^-
\Lambda \bar{\Xi}^+ +c.c.$ $(J=0,\ 1,\ 2)$, and $\psip\to \Xi(1690/1820)^{-}
\bar{\Xi}^++c.c$ with subsequent decay $\Xi(1690/1820)^-\to K^-\Lambda$ are
measured for the first time.

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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph