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Author (up) LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Zhuo, J. url  doi
openurl 
  Title Test of Lepton Flavor Universality with B+ → K+ π+ π- l+ l- Decays Type Journal Article
  Year 2025 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.  
  Volume 134 Issue 18 Pages 181803 - 13pp  
  Keywords  
  Abstract The first test of lepton flavor universality between muons and electrons using B+ -> K+ pi(+) pi(-) l(+) l(-) (l = e, mu) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb(-1). The ratio of branching fractions between B+ -> K+ pi(+) pi(-) mu(+) mu(-) decays is measured in the dilepton invariant-mass-squared range 1.1 < q(2) < 7.0 GeV2/c(4) and is found to be R-K pi pi(-1) = 1.31(-0.17)(+0.18) (stat)(-0.09)(+0.12) (syst), in agreement with the standard model prediction. The first observation of the B+ -> K+ pi(+) pi(-) e(+) e(-) decay is also reported.  
  Address [Bonacci, R. B.; Dekkers, S.; Egede, U.; Fujii, Y.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0031-9007 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001498379300001 Approved no  
  Is ISI yes International Collaboration yes  
  Call Number IFIC @ pastor @ Serial 6839  
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