Revisiting lifetimes of doubly charmed baryons

Abstract

We present updated predictions for lifetimes of doubly charmed baryons, within the heavy quark expansion, including available NLO ${\alpha }_s$ contributions and newly-computed terms in the $1/m_c$ series. Our improved results confirm the expected hierarchy $$\tau ({\Xi }_{cc}^{+})<\tau ({\Omega }_{cc}^{+})<\tau ({\Xi }_{cc}^{++}),$$ while the predicted lifetime $\tau ({\Xi }_{cc}^{++})=0.32\pm 0.05_{-0.07}^{+0.08}\text{ps}$ is consistent with the recent LHCb determination. We provide predictions for the lifetime ratios of the ${\Xi }_{cc}^{+}$ and ${\Omega }_{cc}^{+}$ baryons relative to the ${\Xi }_{cc}^{++}$ baryon, namely $\tau ({\Xi }_{cc}^{+})/\tau ({\Xi }_{cc}^{++})=0.22\pm 0.05\pm 0.04$ and $\tau ({\Omega }_{cc}^{+})/\tau ({\Xi }_{cc}^{++})=0.52\pm 0.13_{-0.02}^{+0.03}$.

arXiv comment25 pages, 2 figures; v2: few clarifications added, one reference added, matches version accepted for publication; v3: Fixed numerical typos in predicted ${\Xi }_{cc}^{++}$ lifetime uncertainty quoted in the abstract

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Cited by in corpus (2)

• Observation of the doubly charmed baryon ${\Xi }_{cc}^{+}$ with the LHCb Run 3 detector
• Lepton flavor violating top quark FCNC processes at the $\mu$TRISTAN