# Search for the doubly charmed baryon $\Xi_{cc}^+$

LHCb Collaboration; Aaij, R; Adeva, B; Adinolfi, M; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Search for the doubly charmed baryon $\Xi_{cc}^+$. Journal of High Energy Physics, 2013:90.

## Abstract

A search for the doubly charmed baryon Ξ+cc in the decay mode Ξ+cc→Λ+cK−π+ is performed with a data sample, corresponding to an integrated luminosity of 0.65 fb−1, of pp collisions recorded at a centre-of-mass energy of 7 TeV. No significant signal is found in the mass range 3300-3800 MeV/c 2. Upper limits at the 95% confidence level on the ratio of the Ξ+cc production cross-section times branching fraction to that of the Λ+c , R, are given as a function of the Ξ+cc mass and lifetime. The largest upper limits range from R < 1.5 × 10−2 for a lifetime of 100 fs to R < 3.9 × 10−4 for a lifetime of 400 fs.

## Abstract

A search for the doubly charmed baryon Ξ+cc in the decay mode Ξ+cc→Λ+cK−π+ is performed with a data sample, corresponding to an integrated luminosity of 0.65 fb−1, of pp collisions recorded at a centre-of-mass energy of 7 TeV. No significant signal is found in the mass range 3300-3800 MeV/c 2. Upper limits at the 95% confidence level on the ratio of the Ξ+cc production cross-section times branching fraction to that of the Λ+c , R, are given as a function of the Ξ+cc mass and lifetime. The largest upper limits range from R < 1.5 × 10−2 for a lifetime of 100 fs to R < 3.9 × 10−4 for a lifetime of 400 fs.

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