Observation of the doubly charmed baryon decay Ξcc++ → Ξc′+π+

The Xi(++)(cc) -> Xi('+)(c)pi(+) decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb(-1). The Xi(++)(cc) -> Xi('+)(c)pi(+) decay is reconstructed partially, where the photon from the Xi('+)(c) -> Xi(+)(c)gamma decay is not reconstructed and the pK(-)pi(+) final state of the Sc+ baryon is employed. The Xi(++)(cc) -> Xi('+)(c)pi(+) branching fraction relative to that of the Xi(++)(cc) -> Xi('+)(c)pi(+) decay is measured to be 1.41 +/- 0.17 +/- 0.10, where the first uncertainty is statistical and the second systematic.

Automated summary

The Xi(++)(cc) -> Xi('+)(c)pi(+) decay is observed and measured using data collected by the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction relative to another decay is found to be 1.41 with uncertainties accounted for.