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Measurement of $\mathit{\Xi}_{cc}^{++}$ production in $pp$ collisions at $\sqrt{s}=13$ TeV

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Abstract

The production of $\mathit{\Xi}_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured in the transverse-momentum range $4<p_\mathrm{T}<15 \mathrm{GeV}$/$c$ and the rapidity range $2.0<y<4.5$. The data used in this measurement correspond to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, recorded by the LHCb experiment during 2016. The ratio of the $\mathit{\Xi}_{cc}^{++}$ production cross-section times the branching fraction of the $\mathit{\Xi_{cc}^{++} \to \Lambda_{c}^{+} K^- \pi^+ \pi^+}$ decay relative to the prompt $\mathit{\Lambda_c^{+}}$ production cross-section is found to be $(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$, assuming the central value of the measured $\mathit{\Xi_{cc}^{++}}$ lifetime, where the first uncertainty is statistical and the second systematic.

Figures and captions

Invariant-mass distributions of $\Xi ^{++}_{ c c } $ candidates (a) triggered by TOS and (b) triggered by exTIS, with fit results shown.

TOSMassFit.pdf [20 KiB]
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TOSMassFit.pdf
TISMassFit.pdf [20 KiB]
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TISMassFit.pdf

Invariant-mass distributions of $\Lambda ^+_ c $ candidates (a) triggered by TOS and (b) triggered by exTIS, with fit results shown.

LcTOSm[..].pdf [22 KiB]
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LcTOSmassfits.pdf
LcTISm[..].pdf [22 KiB]
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LcTISmassfits.pdf

Distributions of $\log_{10}(\chi^2_{\text{IP}} (\Lambda ^+_ c ))$ for background-subtracted candidates (a) triggered by TOS and (b) triggered by exTIS, with fit results shown.

LcIPTO[..].pdf [20 KiB]
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LcIPTOStight.pdf
LcIPTI[..].pdf [20 KiB]
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LcIPTIStight.pdf

Animated gif made out of all figures.

PAPER-2019-035.gif
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thumbnail_PAPER-2019-035.gif

Tables and captions

Yields of the signal and normalisation modes.

Table_1.pdf [50 KiB]
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Table_1.pdf

Ratios of the normalisation and signal efficiencies.

Table_2.pdf [85 KiB]
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Table_2.pdf

Relative systematic uncertainties on the production ratio measurement for the two trigger categories.

Table_3.pdf [33 KiB]
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Table_3.pdf

Production rate ratio results for three different $\Xi ^{++}_{ c c } $ lifetime hypotheses. The first uncertainty is statistical and the second is systematic.

Table_4.pdf [93 KiB]
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Table_4.pdf

Created on 20 February 2021.