6533b853fe1ef96bd12aca62

RESEARCH PRODUCT

Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2×1021 Protons on Target

A. T. SuzukiJ. F. MartinT. NakadairaY. SonodaT. S. NonnenmacherA. BravarG. ChristodoulouY. NakanishiK. NakamuraK. NakamuraC. BarryS. MurphyB. RossiJ. L. PalominoA. ShaikhievP. JonssonS. MoriyamaV. PalladinoT. TsukamotoHyun-chul KimM. BatkiewiczA. IzmaylovA. IzmaylovVincenzo BerardiB. BourguilleD. HansenC. RiccioMasayuki NakahataMasayuki NakahataC. PidcottY. UchidaA. DabrowskaJan KisielA. LonghinD. CherdackK. AbeT. LouM. LaweN. C. HastingsJ. HaradaE. RadicioniL. LabargaC. McgrewH. K. TanakaP. MartinsK. SakashitaS. M. OserS. M. OserT. KobayashiY. HayatoY. HayatoC. AndreopoulosC. AndreopoulosM. G. CatanesiL. KochH. W. SobelH. W. SobelYoshikazu YamadaZ. J. LiptakK. G. NakamuraY. AzumaS. YamasuD. L. WarkD. L. WarkB. A. PopovS. DolanT. LindnerL. BernsA. CuddY. SeiyaT. GolanE. KearnsE. KearnsT. VladisavljevicT. VladisavljevicS. BienstockM. YuMasashi YokoyamaT. OkusawaR. AkutsuJungsang KimJungsang KimS. Y. SuzukiF. BenchO. DrapierC. BronnerYuki FujiiD. CoploweG. VasseurL. L. KormosMasaki IshitsukaG. De RosaT. YanoJ. WalkerT. IshiiA. MefodievM. R. VaginsM. R. VaginsJ. CalcuttM. PavinPablo FernandezYusuke SudaC. VilelaK. IwamotoY. NishimuraM. J. WilkingM. GoninA. D. MarinoJ. DumarchezA. BlondelA. RychterTsuyoshi NakayaTsuyoshi NakayaK. E. DuffyP. PaudyalJ. ImberC. K. JungA. KonakaAhmed AliJ. SchwehrW. OryszczakK. ZarembaF. Di LodovicoJ. P. LopezKate ScholbergG. FiorilloA. KnoxA. ZykovaMarco LavederMasato ShiozawaMasato ShiozawaT. SekiguchiA. CerveraXiao-yan LiK. S. McfarlandYusuke KoshioA. HiramotoAtsushi TakedaM. KabirnezhadM. HartzM. HartzK. GameilK. GameilL. LudoviciD. KarlenD. KarlenA. A. SztucS. L. CartwrightS. BhadraM. MezzettoW. UnoYutaka NakajimaM. TadaS. KingAlessandro RuggeriS. BerkmanS. BerkmanM. ZitoK. NakamuraB QuilainE. RondioP. StowellHidekazu KakunoT. HasegawaYoshihiro SuzukiN. MccauleyV. PaoloneJ. AmeyC. M. NantaisT. ThakoreD. R. HadleyT. HayashinoS. MineK. M. TsuiY. NagaiC. YanagisawaG. YangK. PorwitZ. VallariW. Y. MaRyuji TamuraD. J. PayneM. KuzeTakashi YoshidaShin SasakiP. LasorakM. TzanovC. J. MetelkoL. F. ThompsonM. HoganGareth J. BarkerE. D. ZimmermanYu.a. KudenkoC. ChecchiaC. WilkinsonVladimir VolkovD. BrailsfordR. ShahR. ShahM. LamoureuxHidetoshi KuboR. A. WendellR. A. OwenP. NovellaA. C. WeberA. C. WeberE. MazzucatoT. WachalaJ. P. ColemanS. R. DennisF. ShakerL. PickeringC. DenshamS. ManlyR. M. BernerM. MiuraT. DealtryC. WretN. DokaniaM. Posiadala-zezulaTakahiko MatsubaraG. CollazuolPatrick DunneA. MissertYuichi OyamaMark ScottS. SuvorovR. P. LitchfieldHiroyuki SekiyaHiroyuki SekiyaF. GizzarelliJ. R. WilsonC. NielsenC. NielsenJochen SteinmannKoji YamamotoYanbin WangAsher KabothAsher KabothR. FujitaLeïla HaegelL. MagalettiC. GigantiT. KogaY. FukudaS. V. CaoKendall MahnP. F. DennerY. TakeuchiY. TakeuchiC. TouramanisT. InoueG. A. FiorentiniM. JiangAntonio EreditatoJ. A. NowakA. ChappellR. A. IntontiC. PistilloN. YershovT. MaruyamaD. ShawW. H. TokiHiromasa TanakaHiromasa TanakaL. MaretG.d. BarrE. Reinherz-aronisP. N. RatoffT. KutterM. FriendTeppei KatoriT. StewartE. ScantamburloR.p. KurjataF. HosomiK. KowalikV. A. MatveevM. B. SmyYuta KatoN. ChikumaA. N. KhotjantsevP. P. KollerS. BolognesiM. M. KhabibullinS. B. BoydS. BanM. MccarthyT. IshidaJ. T. HaighXianguo LuK. NiewczasL. H. V. AnthonyAndré RubbiaYuto AshidaD. SgalabernaA. J. FinchSteven C. JohnsonS. NakayamaS. YenM. AntonovaJ. LagodaR. J. WilsonS. Emery-schrenkA. K. IchikawaK. MavrokoridisS. RothJ. KamedaE. S. Pinzon GuerraTh. A. MuellerR. TacikR. TacikA. KnightD. FukudaL. O'sullivanH. M. O'keeffeM. O. WasckoOleg MineevM. ZiembickiJ. ZalipskaAkitaka ArigaKo OkumuraKo OkumuraP. Hamacher-baumannTakaaki KajitaK. YasutomeM. IkedaA. ZalewskaFederico SanchezShigeki AokiM. BarbiM. LicciardiT. FeuselsT. FeuselsA. MinaminoM. MalekAlexei Yu. SmirnovK. NishikawaJan T. SobczykC. FrancoisJ. MorrisonA. PritchardG. ZarneckiM. Buizza AvanziniB. JamiesonJ. HoleczekThomas B. CampbellK. NakayoshiS. ZsoldosT. Radermacher

subject

PhysicsParticle physics010308 nuclear & particles physicsT2K experimentGeneral Physics and Astronomy01 natural sciencesNeutrino detector0103 physical sciencesCP violationMuon neutrinoNeutrino010306 general physicsNeutrino oscillationElectron neutrino

description

The T2K experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and antineutrino beams. With an exposure of $14.7(7.6)\times 10^{20}$ protons on target in neutrino (antineutrino) mode, 89 $\nu_e$ candidates and 7 anti-$\nu_e$ candidates were observed while 67.5 and 9.0 are expected for $\delta_{CP}=0$ and normal mass ordering. The obtained $2\sigma$ confidence interval for the $CP$ violating phase, $\delta_{CP}$, does not include the $CP$-conserving cases ($\delta_{CP}=0,\pi$). The best-fit values of other parameters are $\sin^2\theta_{23} = 0.526^{+0.032}_{-0.036}$ and $\Delta m^2_{32}=2.463\pm0.065\times10^{-3} \mathrm{eV}^2/c^4$.

https://doi.org/10.1103/physrevlett.121.171802