The international collaboration of the LHCb experiment, in which participate the Institute for Cosmos Sciences of University of Barcelona, the Ramon Llull university, the Santiago de Compostela University and the Institute for Corpuscular Physics (IFIC, CSIC-UV), published on 27th of July in Nature journal the first barionic measurement of the quark coupling strength |Vub|. This parameter is part of the "CKM" matrix. A matrix which governs the decays among the three families of elemental particles that exist and whose values are not predicted by the Standard Model. Concretely, the parameter |Vub| stands for the probability of a quark b (beauty) decaying to a quark up and a boson W (a weak interaction mediator). For the first time researchers have been able to measure this parameter for baryons, particles formed by 3 quarks, instead of mesons (quark and antiquark). Since the difference on the measurement of |Vub| between mesons and baryons is an extra "spectator" quark in the case of baryons, the result was expected to be pretty similar in both cases. As Eugeni Graugès from ICCUB states " The outcome confirms our expectations considering the fact that both results for mesons and baryons are almost equal". However, the measurement of |Vub| for baryons at LHCb contributes to a remaining question. The results found up to date reinforce the idea that in nature are favoured the decays of particles whose spin turns counterwise. However different kinds of measurements still show discrepances and will have to be analysed in more detail in order to understand to a better level elemental interactions. More information: “Determination of the quark coupling strength |Vub| using baryonic decays”, arXiv:1504.01568v1 Contact of spanish groups at LHCb: Eugeni Graugés. Grupo LHCb en la Universidad de Barcelona. grauges@ecm.ub.edu // 93 403 91 90 Juan Saborido. Responsable grupo LHCb Universidad de Santiago de Compostela. juan.saborido@usc.es // 881 81 41 09 // 629 96 60 03 Arantza Oyanguren. Investigadora del Instituto de Física Corpuscular en LHCb. Arantza.Oyanguren@ific.uv.es // 96 354 35 37 // 696 45 77 12