Measurement of the branching fraction of the decay B0s→K0SK0S

Physical Review D - Particles, Fields, Gravitation and Cosmology. 2020. Vol. 102. No. 1. P. 012011.

Aaij R., Beteta C. A., Boldyrev A., Derkach D., Hushchyn M., Kazeev N., Maevskiy A., Ratnikov F., Ustyuzhanin A., LHCb C.

A measurement of the branching fraction of the decay B0s→K0SK0S is performed using proton–proton collision data corresponding to an integrated luminosity of 5  fb−1 collected by the LHCb experiment between 2011 and 2016. The branching fraction is determined to be B(B0s→K0SK0S)=[8.3±1.6(stat)±0.9(syst)±0.8(norm)±0.3(fs/fd)]×10−6, where the first uncertainty is statistical, the second is systematic, and the third and fourth are due to uncertainties on the branching fraction of the normalization mode B0→ϕK0S and the ratio of hadronization fractions fs/fd. This is the most precise measurement of this branching fraction to date. Furthermore, a measurement of the branching fraction of the decay B0→K0SK0S is performed relative to that of the B0s→K0SK0S channel, and is found to be B(B0→K0SK0S)B(B0s→K0SK0S)=[7.5±3.1(stat)±0.5(syst)±0.3(fs/fd)]×10−2.

Keywords: физика высоких энергий, Experimental High Energy Physics and Elementary Particles Physics

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 (2020)