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Observation of the doubly charmed baryon decay $ {\varXi}_{cc}^{++}\to {\varXi}_c^{\prime +}{\pi}^{+} $

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Abstract

The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of $13\mathrm{ Te V}$, corresponding to an integrated luminosity of $5.4 \mathrm{fb}^{-1}$. The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ decay is reconstructed partially, where the photon from the $\it{\Xi_{c}^{'+} \to \Xi_{c}^{+}\gamma}$ decay is not reconstructed and the $pK^-\pi^+$ final state of the $\it{\Xi_{c}^{+}}$ baryon is employed. The $\it{\Xi_{cc}^{++}\to \Xi_{c}^{'+}\pi^{+}}$ branching fraction relative to that of the $\it{\Xi_{cc}^{++}\to \Xi_{c}^{+}\pi^{+}}$ decay is measured to be $1.41 \pm 0.17 \pm 0.10$, where the first uncertainty is statistical and the second systematic.

Figures and captions

(Left) external and (right) internal $W$-emission diagrams of the $\Xi ^{++}_{ c c } \rightarrow \Xi _{ c }^{(')+}\pi ^+ $ decay.

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Invariant-mass distribution of the $\Xi ^{++}_{ c c } $ candidates from the (left) TOS and (right) TIS samples, with the results of the fit overlaid. The $\Xi ^{++}_{ c c } \rightarrow \Xi ^{'+}_ c \pi ^+ $ component is shown as a purple dashed line, the $\Xi ^{++}_{ c c } \rightarrow \Xi ^+_ c \pi ^+ $ component as a red dotted line, the $\Xi ^{++}_{ c c } \rightarrow \Xi ^+_ c \pi ^+ \pi ^0 $ component as a yellow dashed line and the combinatorial component as a green dashed line.

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Animated gif made out of all figures.

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Tables and captions

Yields of the signal and normalisation decay modes, and the relative yields.

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Relative systematic uncertainties on the branching fraction ratio $\frac{\mathcal{B} (\Xi ^{++}_{ c c } \rightarrow \Xi ^{'+}_ c \pi ^+ )}{\mathcal{B} (\Xi ^{++}_{ c c } \rightarrow \Xi ^+_ c \pi ^+ )}$.

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Supplementary Material [file]

Supplementary material full pdf

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Created on 27 April 2024.