6533b85dfe1ef96bd12bdcbf
RESEARCH PRODUCT
Test of lepton flavour universality in K+→ℓ+ν decays
N. A. MolokanovaK. EppardM. NapolitanoFabrizio PetrucciD. CowardLeander LitovB. HallgrenAntonino SergiP. L. FrabettiV. KozhuharovH. O. DanielssonP. RubinN. DobleM. VeltriT. NumaoOleg YushchenkoV. ObraztsovA. NortonRoland WinstonEvgueni GoudzovskiE. IacopiniM. PepeM. Hita-hochgesandB. RenkA. AntonelliF. RetiereG. D'agostiniRoberta ArcidiaconoT. SpadaroPaolo ValenteE. GushchinR. FantechiCristina BiinoViacheslav DukA. A. MaierP. F. DalpiazF. MarchettoM. LentiA. PetersYu. PotrebenikovKonrad KleinknechtW. BaldiniA. WinhartS. MovchanC. LazzeroniMauro PicciniF. AmbrosinoS. GiudiciG. RuggieroA. I. ZinchenkoG. SaracinoJürgen EngelfriedRoberto PiandaniV. KurshetsovC. CerriI. MannelliA. RomanoM. SozziA. GianoliMauro RaggiG. CollazuolD. Di FilippoL. DilellaMassimiliano FioriniG.m. PierazziniV. PalladinoM. DyulendarovaS. Goy LopezV K SemenovD. T. MadigozhinA. FucciG. AnzivinoLau GatignonF. BucciS. BalevVladimir KekelidzeA. CeccucciP. CenciAndrea BizzetiSimone BifaniH. D. WahlB. PeyaudPetra RiedlerV. FalaleevS. VendittiI. PopovM. SerraE. MarinovaP. MassarottiM. SavrieV. BolotovB. Bloch-devauxE. ImbergamoA. Cotta RamusinoG. LamannaG. DellacasaA. SalamonF. CostantiniEmilio LeonardiRainer WankeStefano GalloriniM. MoulsonS. Shkarovskiysubject
Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle physicsFlavourWidth ratioUniversality (dynamical systems)Leptondescription
Abstract A precision test of lepton flavour universality has been performed by measuring the ratio R K of kaon leptonic decay rates K + → e + ν and K + → μ + ν in a sample of 59 813 reconstructed K + → e + ν candidates with ( 8.71 ± 0.24 ) % background contamination. The result R K = ( 2.487 ± 0.013 ) × 10 − 5 is in agreement with the Standard Model expectation.
year | journal | country | edition | language |
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2011-04-01 | Physics Letters B |