Search for the doubly heavy baryons Ω0bc and Ξ0bc decaying to Λ+cπ− and Ξ+cπ−

Chinese Physics C. 2021. Vol. 45. No. 9. Article 093002.

Aaij R., Abellán Beteta C., Ackernley T., Adeva B., Adinolfi M., Arzymatov K., Belavin V., Boldyrev A., Derkach D., Hushchyn M., Karpov M., Maevskiy A., Phillippov A. S., Popov S., Ratnikov F., Ryzhikov A., Ustyuzhanin A., LHCb Collaboration -.

The first search for the doubly heavy Ω0bc baryon and a search for Ξ0bc baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.2fb−1. The baryons are reconstructed via their decays to Λ+cπ− and Ξ+cπ−. No significant excess is found for invariant masses between 6700 and 7300MeV/c2, in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20GeV/c. Upper limits are set on the ratio of the Ω0bc and Ξ0bc production cross-section times the branching fraction to Λ+cπ− (Ξ+cπ−) relative to that of the Λ0b (Ξ0b) baryon, for different lifetime hypotheses, at 95% confidence level. The upper limits range from 0.5×10−4 to 2.5×10−4 for the Ω0bc→Λ+cπ− (Ξ0bc→Λ+cπ−) decay, and from 1.4×10−3 to 6.9×10−3 for the Ω0bc→Ξ+cπ− (Ξ0bc→Ξ+cπ−) decay, depending on the considered mass and lifetime of the Ω0bc (Ξ0bc) baryon.

Keywords: анализ данных, data analysis, high energy physics, физика высоких энергий

Publication based on the results of: Machine learning to check and improve the quality of data collected at the Large Hadron Collider and other particle physics experiments (2021)