LHCb CollaborationAdeva Andany, BernardoÁlvarez Cartelle, PaulaDosil Suárez, ÁlvaroFernández Albor, Víctor ManuelGallas Torreira, Abraham AntonioGarcía Pardiñas, JuliánHernando Morata, José ÁngelPazos Álvarez, AntonioPérez Trigo, EliseoPlo Casasus, MáximoRomero Vidal, AntonioSaborido Silva, Juan JoséSanmartín Sedes, BraisSantamarina Ríos, CibránSeco Miguélez, Marcos AntonioVázquez Regueiro, PabloVázquez Sierra, CarlosVieites Díaz, María2020-04-242020-04-242015Aaij, R., Beteta, C. A., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., ... & Ali, S. (2015). Determination of γ and− 2βs from charmless two-body decays of beauty mesons. Physics Letters B, 741, 1-110370-2693http://hdl.handle.net/10347/21715Using the latest LHCb measurements of time-dependent CPviolation in the B0s→K+K−decay, aU-spinrelation between the decay amplitudes of B0s→K+K−and B0→π+π−decay processes allows constraints to be placed on the angle γof the unitarity triangle and on the B0smixing phase −2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spinbreaking is studied. At 68% probability, the value γ=(63.5+7.2−6.7)◦modulo180◦is determined. In an alternative analysis, the value −2βs=−0.12+0.14−0.16radis found. In both measurements, the uncertainties due to U-spinbreaking effects up to 50% are includedeng©2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3http://creativecommons.org/licenses/by/3.0/journal article10.1016/j.physletb.2014.12.0151873-2445open access