6533b7dafe1ef96bd126e3a8

RESEARCH PRODUCT

Measurement of matter-antimatter differences in beauty baryon decays

R. An Aaij AdevaB. Am AdinolfiM. AvZ. E. AjaltouniS. F. AkarJ. J. Albrecht AlessioF. An AlexanderM. Ba AliS. Aq AlkhazovG. AeCartelle AlvarezP. BcA. A. AlvesJr. BgS. B. AmatoS. W. AmerioY. G. Amhis AnL. AoL. R. Anderlini AndreassiG. AoM. Q. AndreottiBx AndrewsBh J. E. ApplebyBd R. B. ArchilliF. AqP. L. D'argentRomeu ArnauJ. F. ArtamonovA. Ak ArtusoM. BiE. F. AslanidesG. Z. AuriemmaM. E. Baalouch BabuschkinI. BdS. L. Bachmann BackAx J. J. BadalovA. Al BaessoC. Bj BakerS. BcW. Q. Baldini BarlowBd R. J. BarschelC. AnS. G. Barsuk BarterW. An BaszczykM. Aa BatozskayaV. Ac BatsukhB. Bi BattistaV. Ao BayA. AoL. D. Beaucourt BeddowJ. BaF. X. BedeschiI. A. Bediaga BelAq L. J. BelleeV. AoN. U. BelloliBz BelousK. Ak BelyaevI. AfE. H. Ben-haimG. S. Bencivenni BensonS. Aq BentonJ. Av BerezhnoyA. Ag BernetR. ApA. W. BertolinF. O. Betti BettlerAn M. -O.Beuzekom VanM. Aq BezshyikoI. Ap BifaniS. AuP. H. Billoir BirdT. BdA. J. Birnkraut BitadzeA. BdA. R. BizzetiCl BlakeT. Ax BlancF. AoJ. K. 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Ax KrokovnyP. AjF. J. Kruse KrzemienW. Ac KucewiczW. AaCc KucharczykM. Aa KudryavtsevV. Aj KuonenAo A. K. KurekK. Ac KvaratskheliyaT. AfAn LacarrereD. An LaffertyG. BdA. P. Lai LambertD. AzG. S. LanfranchiC. I. Langenbruch LathamT. Ax LazzeroniC. AuLe Gac R. F.Leerdam VanJ. Aq Lees J. -P. D. LeflatA. AgAn LefrançoisJ. G. LefèvreR. E. LemaitreF. AnCid LemosE. AmO. F. Leroy LesiakT. AaB. L. LeveringtonLi Y. G. LikhomanenkoT. AiBo LindnerR. An LinnC. An LionettoF. ApB. P. LiuX. C. Liu LohD. Ax LongstaffI. BaJ. H. B. LopesD. W. Lucchesi CfMartinez LucioM. Am LuoH. AzA. W. LupatoE. Q. LuppiBx LuptonO. BeA. X. Lusiani LyuX. BkF. G. Machefert MaciucF. Ad MaevO. Ae MaguireK. Bd MaldeS. Be MalininA. Bo MaltsevT. AjG. G. MancaG. F. Mancinelli ManningP. BiJ. E. MaratasCm MarchandJ. F. D. Marconi U. O.Benito MarinC. AlP. X. MarinoCk MarksJ. L. MartellottiG. Z. MartinM. F. MartinelliM. AoSantos MartinezD. AmVidal MartinezF. BpTostes MartinsD. B. MassacrierL. M. G. MassafferriA. A. MatevR. An MathadA. Ax MatheZ. AnC. U. Matteuzzi MauriA. Ap MaurinB. Ao MazurovA. Au MccannM. Bc MccarthyJ. Au McnabA. BdR. M. Mcnulty MeadowsB. BgF. J. MeierM. L. Meissner MelnychukD. Ac MerkM. AqA. V. MerliCh MichielinE. W. MilanesBm D. A. Minard M. -N. D.D. S. L. MitzelA. H. MoginiRodriguez MolinaJ. Bj MonroyBm I. A.S. E. MonteilM. W. Morandin MorawskiP. AbA. F. MordàM. J. X. MorelloCk MoronJ. Ab MorrisAz A. B. MountainR. Bi MuheimF. Az MulderM. AqM. O. Mussini MüllerD. BdJ. J. Müller MüllerK. ApV. J. Müller NaikP. Av NakadaT. Ao NandakumarR. Ay NandiA. BeI. B. Nasteva NeedhamM. AzN. V. NeriS. L. Neubert NeufeldN. AnM. L. Neuner NguyenAo A. D. Nguyen-mauC. AoCe NieswandS. I. NietR. J. NikitinN. AgT. L. Nikodem NovoselovA. Ak O'hanlonAx D. P. Oblakowska-muchaA. Ab ObraztsovV. AkS. S. Ogilvy OldemanR. Aw OnderwaterBq C. J. G.Goicochea OtaloraJ. M. B. OttoA. An OwenP. Ap OyangurenA. Bp PaisAo P. R.A. N. PalanoBu PalomboCh F. V.M. S. Palutan PanmanJ. An PapanestisA. AyM. N. 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BgLopez RodriguezBm J. A.Perez RodriguezP. Bd RogozhnikovA. Ai RoiserS. An RomanovskiyV. AkVidal RomeroA. AmJ. W. M. RonayneM. S. Rotondo RudolphBi M. S. RufT. AnValls RuizP. BpSilva SaboridoAm J. J. SadykhovE. Af SagidovaN. AeB. P. Saitta BwGuimaraes Salustino V. B.Mayordomo SanchezC. BpSedes SanmartinB. AmR. Z. SantacesariaRios SantamarinaC. AmM. S. SantimariaE. Y. SantovettiCa SartiCb A. S.C. Z. SatrianoCj SattaA. Y. SaundersAv D. M. SavrinaD. AfAg SchaelS. I. SchellenbergM. J. SchillerM. An SchindlerH. AnM. J. SchluppM. K. SchmellingT. J. Schmelzer SchmidtB. An SchneiderO. Ao SchopperA. AnK. J. Schubert SchubigerM. Ao Schune M. -H. G. SchwemmerR. AnB. S. SciasciaA. Z. SciubbaCb SemennikovA. Af SergiA. Au SerraN. ApJ. F. SerranoL. W. SestiniP. U. Seyfert ShapkinM. Ak ShapovalI. As ShcheglovY. Ae ShearsT. Bb ShekhtmanL. Aj ShevchenkoV. BoA. J. ShiresB. G. Q. Siddi AnCoutinho SilvaR. ApDe OliveiraL. S. B. SimiCf G. W.S. N. SimoneBu SirendiM. Aw SkidmoreN. Av SkwarnickiT. Bi SmithE. 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J.M. VeltriCi VenezianoG. Ao VenkateswaranA. BiM. E. VernetM. L. VesterinenB. G. ViaudD. A. VieiraDiaz VieitesM. Am Vilasis-cardonaX. AlCd VolkovV. Ag VollhardtA. Ap VonekiB. An VorobyevA. Ae VorobyevV. Aj VoßC. BnDe VriesAq J. A.Sierra VázquezC. Am WaldiR. Bn WallaceC. AxR. M. WallaceJ. X. Walsh WangJ. Bi WardAw D. R. WarkBb H. M. WatsonAu N. K. WebsdaleD. Bc WeidenA. Ap WhiteheadM. An WichtJ. Ax WilkinsonG. AnBe WilkinsonM. Bi WilliamsM. An WilliamsAu M. P. WilliamsM. Bf WilliamsT. Au WilsonAy F. F. WimberleyJ. BhJ. J. Wishahi WislickiW. Ac WitekM. AaG. G. Wormser WottonAw S. A. WraightK. Ba WrightS. Aw WyllieK. An XieY. Bl XingZ. Bi XuZ. AoZ. C. Yang YinH. Bl YuJ. Bl YuanX. Aj YushchenkoO. Ak ZarebskiAu K. A.M. K. ZavertyaevBt ZhangL. C. ZhangY. G. ZhangY. BkA. L. Zhelezov ZhengY. Bk ZhokhovA. AfX. C. ZhuV. I. ZhukovS. Zucchelli

subject

Physics beyond the Standard ModelHadrontransformation [parity]General Physics and Astronomy7000 GeV-cms8000 GeV-cmsviolation [CP]decay [meson]01 natural sciencesHigh Energy Physics - ExperimentSettore FIS/04 - Fisica Nucleare e SubnucleareHigh Energy Physics - Experiment (hep-ex)antimatterscattering [p p][PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]AntimatèriaDecays of bottom mesons Flavor symmetriesB mesonLHCb - Abteilung HintonPhysicsLarge Hadron Collider02 Physical Sciencesnew physicsCabibbo–Kobayashi–Maskawa matrixPhysicsparity: transformationParticle physicsFlavor symmetriesCharge conjugation parity time reversal and other discrete symmetrieDecays of bottom mesonsasymmetry: CPCERN LHC CollCP-VIOLATION; LAMBDA(B)meson: decayangular distribution [decay]AntimatterPhysical SciencesCP violationLHCcolliding beams [p p]Lambda/b0: hadronic decayParticle Physics - Experimentp p: scatteringParticle physicsAntimatterFluids & PlasmasPhysics MultidisciplinaryLambda/b0 --> p pi- K+ K-FOS: Physical scienceshadronic decay [Lambda/b0]Lambda/b0 --> p pi+ 2pi-CP [asymmetry]530Lambda/b0 --> p pi+ 2pi-Determination of Cabibbo-Kobayashi & Maskawa (CKM) matrix elementNONuclear physicsPhysics and Astronomy (all)LAMBDA(B)TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY0103 physical sciencesCP: violationdecay: angular distributionddc:530010306 general physicsLarge Hadron Collider (France and Switzerland)01 Mathematical SciencesScience & Technologycharge conjugation010308 nuclear & particles physicshep-exLambda/b0 --> p pi- K+ K-High Energy Physics::PhenomenologyGran Col·lisionador d'HadronsLHC-BHEPBaryonLHCbCP-VIOLATIONCKM matrixHadronic decays of baryonBottom baryons (|B|>0)High Energy Physics::ExperimentFísica de partículesExperimentsp p: colliding beamsstatisticalexperimental results

description

Differences in the behaviour of matter and antimatter have been observed in $K$ and $B$ meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as $C\!P$ violation. Using data from the LHCb experiment at the Large Hadron Collider, a search is made for $C\!P$-violating asymmetries in the decay angle distributions of $\Lambda^0_b$ baryons decaying to $p\pi^-\pi^+\pi^-$ and $p\pi^-K^+K^-$ final states. These four-body hadronic decays are a promising place to search for sources of $C\!P$ violation both within and beyond the Standard Model of particle physics. We find evidence for $C\!P$ violation in $\Lambda^0_b$ to $p\pi^-\pi^+\pi^-$ decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for $C\!P$ violation in the baryon sector.

10.1038/nphys4021https://hdl.handle.net/21.11116/0000-0005-8B32-621.11116/0000-0005-8B34-4