| Abstract: | A search for the doubly charmed baryon $it{Xi}_{cc}^{+}$ is performed in
the $it{Xi}_{cc}^{+}
ightarrow it{Xi}_{c}^{+} pi^{-} pi^{+}$ decay
mode, where the $it{Xi}_{c}^{+}$ baryon is reconstructed in the $p K^{-}
pi^{+}$ final state. The study uses proton-proton collision data collected
with the LHCb detector at a centre-of-mass energy of 13$mathrm{,Tekern
-0.1em V}$, corresponding to a total integrated luminosity of
5.4$,mathrm{fb}^{-1}$. No significant signal is observed in the
invariant-mass range of 3.4$-$3.8$mathrm{,Gekern -0.1em V}/c^2$. Upper
limits are set on the ratio of branching fractions multiplied by the production
cross-section with respect to the $it{Xi}_{cc}^{++}
ightarrow
(it{Xi}_{c}^{+}
ightarrow p K^{-} pi^{+}) pi^{+}$ decay for different
$it{Xi}_{cc}^{+}$ mass and lifetime hypotheses in the rapidity range from 2.0
to 4.5 and the transverse momentum range from 2.5 to 25$mathrm{,Gekern
-0.1em V}/c$. The results from this search are combined with a previously
published search for the $it{Xi}_{cc}^{+}
ightarrow it{Lambda}_{c}^{+}
K^{-} pi^{+}$ decay mode, yielding a maximum local significance of 4.0
standard deviations around the mass of 3620$mathrm{,Mekern -0.1em V}/c^2$,
including systematic uncertainties. Taking into account the look-elsewhere
effect in the 3.5$-$3.7$mathrm{,Gekern -0.1em V}/c^2$ mass window, the
combined global significance is 2.9 standard deviations including systematic
uncertainties. |
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