Production fraction ratios of B+, B0, and B0s mesons are measured in proton-proton collisions at (Formula presented) TeV using a special dataset recorded in 2018 with high-rate triggers designed to collect an unbiased sample of 1010 b hadrons with the CMS experiment at the LHC. These data allow the study of the open-charm decays of B mesons (B(s) → πD(s)) where the D meson decays into fully hadronic final states. By utilizing known branching fractions and precise theoretical calculations, production fraction ratios as functions of B meson transverse momentum (pT) and rapidity (y) are measured using open-charm decays in the kinematic range of 8 < pT < 60 GeV and |y| < 2.25. In addition, the same dataset is used to measure the relative production fraction ratios with the charmonium decay channels [B(s) → XJ=ψ with X indicating a K+, K*(892)0, or ϕ(1020) meson] where the J=ψ meson decays into a pair of muons. The open-charm results are used to normalize the relative production fraction ratios obtained from the charmonium samples. Measurements of the ratios of branching fractions of B meson decays to charmonium and open-charm final states are also reported, which will improve the world-average values of these ratios. Finally, we test isospin invariance in B meson production in proton-proton collisions and observe that it holds within the experimental precision.
Measurement of B meson production fraction ratios in proton-proton collisions at √ s = 13 TeV using open-charm and charmonium decays
Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;D'Anzi, B.;De Palma, M.;Elmetenawee, W.;Louka, M.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;
2026-01-01
Abstract
Production fraction ratios of B+, B0, and B0s mesons are measured in proton-proton collisions at (Formula presented) TeV using a special dataset recorded in 2018 with high-rate triggers designed to collect an unbiased sample of 1010 b hadrons with the CMS experiment at the LHC. These data allow the study of the open-charm decays of B mesons (B(s) → πD(s)) where the D meson decays into fully hadronic final states. By utilizing known branching fractions and precise theoretical calculations, production fraction ratios as functions of B meson transverse momentum (pT) and rapidity (y) are measured using open-charm decays in the kinematic range of 8 < pT < 60 GeV and |y| < 2.25. In addition, the same dataset is used to measure the relative production fraction ratios with the charmonium decay channels [B(s) → XJ=ψ with X indicating a K+, K*(892)0, or ϕ(1020) meson] where the J=ψ meson decays into a pair of muons. The open-charm results are used to normalize the relative production fraction ratios obtained from the charmonium samples. Measurements of the ratios of branching fractions of B meson decays to charmonium and open-charm final states are also reported, which will improve the world-average values of these ratios. Finally, we test isospin invariance in B meson production in proton-proton collisions and observe that it holds within the experimental precision.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


