2026-04-14T03:52:32Zhttps://recercat.cat/oai/request

oai:recercat.cat:20.500.14342/33062025-03-11T04:10:34Zcom_2072_482405com_2072_183628col_2072_482415

Study of Beauty Hadron Decays into Pairs of Charm Hadrons Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro Vilasís Cardona, Xavier LHCb Collaboration - CERN Gran col·lisionador d'hadrons (França i Suïssa) Col·lisions (Física nuclear) Partícules (Física nuclear) Protons Hadrons First observations of the decays Λ0b→Λ+cD−(s) are reported using data corresponding to an integrated luminosity of 3  fb−1 collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B(B0s→D+D−s) is made and a search is performed for the decays B0(s)→Λ+cΛ−c. The results obtained are B(Λ0b→Λ+cD−)/B(Λ0b→Λ+cD−s)=0.042±0.003(stat)±0.003(syst),[B(Λ0b→Λ+cD−s)B(¯B0→D+D−s)]/[B(Λ0b→Λ+cπ−)B(¯B0→D+π−)]=0.96±0.02(stat)±0.06(syst),B(B0s→D+D−s)/B(¯B0→D+D−s)=0.038±0.004(stat)±0.003(syst),B(¯B0→Λ+cΛ−c)/B(¯B0→D+D−s)<0.0022[95%  C.L.],B(B0s→Λ+cΛ−c)/B(B0s→D+D−s)<0.30[95%  C.L.].Measurement of the mass of the Λ0b baryon relative to the ¯B0 meson gives M(Λ0b)−M(¯B0)=339.72±0.24(stat)±0.18(syst)  MeV/c2. This result provides the most precise measurement of the mass of the Λ0b baryon to date. 2025-03-11T04:10:34Z 2025-03-11T04:10:34Z 2025-03-11T04:10:34Z 2014-05-21 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.14342/3306 https://doi.org/10.1103/PhysRevLett.112.202001 eng Physical Review Letters, 2014, Vol. 112, No. 20 (Maig) http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Attribution 4.0 International © CERN American Physical Society