Evidence for a narrow anti-charmed baryon state
Å. AktasV. AndreevT. AnthonisA. AsmoneA. BabaevS. BackovićJ. BährP. BaranovE. BarreletW. BartelS. BaumgartnerJ. BeckerM. BeckinghamO. BehnkeO. BehrendtA. BelousovCh. BergerN. BergerT. BerndtJ.C. BizotJ. BöhmeM.-O. BoenigV. BoudryJ. BraciníkV. BrissonH.-B. BrökerDunstan BrownD. BrunckoF.W. BüsserA. BunyatyanG. BuschhornL. BystritskayaA. CampbellS. CaronF. Cassol-BrunnerK. ČernýV. ChekelianC. CollardJ.G. ContrerasY.R. CoppensJ. A. CoughlanB. E. CoxG. CozzikaJ. CvachJ.B. DaintonW.D. DauK. DaumB. DelcourtR. DemirchyanA. De RoeckK. DeschE.A. De WolfC. DiaconuJ. DingfelderV. DodonovA. DubakC. DuprelG. EckerlinV. EfremenkoS. EgliR. EichlerF. EiseleM. EllerbrockE. ElsenM. ErdmannM. ErdmannPeter FaulknerL. FavartA. FedotovR. FelstJ. FerenceiM. FleischerP. FleischmannY.H. FlemingG. FluckeG. FlüggeA. FomenkoI. ForestiJ. FormánekG. FrankeG. FrisingE. GabathulerK. GabathulerE. GaruttiJ. GarveyJ. GaylerR. GerhardsC. GerlichS. GhazaryanA. GlazovL. GoerlichN. GogitidzeS. GorbounovC. GrabH. GrässlerT. GreenshawM. GregoriG. GrindhammerC. B. GwilliamD. HaidtL. HajdukJ. HallerM. HanssonG. HeinzelmannR. C. W. HendersonH. HenschelO. HenshawR. HeremansG. HerreraI. HerynekRolf-Dieter HeuerM. HildebrandtK. H. HillerP. HötingD. HoffmannR. HorisbergerA. HovhannisyanM. IbbotsonMarina IsmailM. JacquetL. JanauschekX. JanssenV. JemanovL. JönssonD.P. JohnsonH. JungD. KantM. KapichineM. KarlssonJ. KatzyN. KellerJ. KennedyI. R. KenyonC. KieslingM. KleinC. KleinwortT. KlimkovichT. KlugeG. KniesA. KnutssonB. KoblitzV. KorbelP. KostkaR. KoutouevA. KropivnitskayaJ. KrosebergJ. KückensT. KuhrM. P. J. LandonW. LangeT. LaštovičkaP. LaycockA. LebedevB. LeißnerR. LemraniV. LendermannS. LevonianL. LindfeldK. LipkaB. ListE. LobodzinskaN. LoktionovaR. López-FernándezV. LubimovH. LuedersD. LükeT. LuxL. LytkinA. MakankineN. MaldenE. MalinovskiS. ManganoP. MarageJ. MarksR. MarshallM. MartišíkováH.‐U. MartynS. J. MaxfieldD. MeerA. MehtaK. MeierA. MeyerH. MeyerJ. MeyerS. MichineS. MikockiI. MilcewiczD. A. MilsteadA. MohamedF. MoreauA. MorozovIgor MorozovJ.V. MorrisM. U. MozerK. MüllerП. МурінV. NagovizinB. NaroskaJ. NaumannT. NaumannP. R. NewmanC. NiebuhrA. NikiforovD. NikitinG. NowakM. NožičkaR. OganezovOlivier BourronJ.E. OlssonG. OssoskovD. OzerovC. PascaudG. D. PatelM. PeezE. PérezA. PerieanuA. PetrukhinD. PitzlR. Plačakyt≐R. PöschlB. PortheaultBogdan PovhN. RaičevićZ. RatianiP. ReimerB. ReisertA. RimmerC. RislerE. RizviP. RobmannB. RolandR. RoosenA. RostovtsevZ. RurikovaS. V. RusakovK. RybickiD. P. C. SankeyE. SauvanS. SchätzelJ. ScheinsF.-P. SchillingP. SchleperS. SchmidtS. SchmittM. SchneiderL. SchoeffelA. SchöningV. SchröderH.-C. Schultz-CoulonC. SchwanenbergerKamil SedlákF. SefkowI. SheviakovL.N. ShtarkovY. SiroisT. SloanP. SmirnovY. SolovievD. SouthV. SpaskovA. SpeckaH. SpitzerR. StamenB. StellaJ. StieweI. StrauchU. StraumannV. TchoulakovG. ThompsonP. D. ThompsonF. TomaszD. TraynorP. TruölG. TsipolitisI. TsurinJ. TurnauE. TzamariudakiA. UraevM. UrbanA. UsikD. UtkinŠ. ValkárA. ValkárováC. ValléeP. Van MechelenN. Van RemortelA. Vargas TrevinoY. VazdikChristian VeelkenA. VestS. VinokurovaV. VolchinskiK. WackerJ. WagnerG. WeberR. WeberD. WegenerC. WernerN. WernerM. WesselsB. WesslingG.G. WinterCh. WissingE.-E. WoehrlingR. WolfE. WünschS. XellaW. G. YanV. YeganovJ. ŽáčekJ. ZálešâkZ. ZhangA. ZhokinH. ZohrabyanF. Zomer
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Charmed baryons
The authors report on several studies of charm baryon production and decays by the BABAR collaboration. They confirm previous observations of the {Xi}'{sub c}{sup 0/+}, {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +} baryons, measure branching ratios for Cabibbo-suppressed {Lambda}{sub c}{sup +} decays and use baryon decays to study the properties of the light-quark baryons, {Omega}{sup -} and {Xi}(1690){sup 0}.
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In the ten years since the first observation of a charmed baryon, the Λ+c remains the only charmed baryon which is firmly established. Three other charmed baryons have been observed, the ΣC, A+, and T0; however, definitive confirmations are needed. The present status of these baryons is discussed.
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The effects of SU(4) breaking are studied in connection with the semileptonic decays and magnetic moments of the baryons with charm +1. Substantial suppression factors are predicted for the decay in which the final baryon belongs to the decimet. The consequences of a vanishing magnetic moment for the charmed quark are studied in detail.
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The existence of doubly heavy flavor baryons has not been well established experimentally so far. In this Letter we systematically investigate the weak decays of the doubly charmed baryons, $\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$, which would be helpful for experimental searches for these particles. The branching fractions are studied under the factorization hypothesis for the short-distance contributions and considering the rescattering effect for the long-distance contributions which are significantly enhanced. Comparing all the decay modes, we recommend the processes of $\Xi_{cc}^{++}\to \Lambda_c^+K^-\pi^+\pi^+$ and $\Xi_c^+\pi^+$ as the first priority for experiments to search for the doubly heavy baryons.
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Compared with the charmed baryons, the bottom baryons are not very well known, either experimentally or theoretically. In this paper, we investigate the dipion strong decays of the P-wave and D-wave excited bottom baryons in the framework of the QPC model. We also extend the same analysis to the charmed baryons.
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It is usually assumed that the production of baryons in $B$ decays is induced primarily by the process $b\ensuremath{\rightarrow}c\overline{u}d$, where the charm quark hadronizes into a charmed baryon. Motivated by an examination of the ${\ensuremath{\Lambda}}_{c}$ momentum spectrum in the transition $B\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}X$, we consider the alternative hypothesis that the production of charmed baryons in $B$ decays is in fact dominated by the transition $b\ensuremath{\rightarrow}c\overline{c}s$, and is seen primarily in modes with two charmed baryons in the final state. The dominance of such a mechanism would have potentially important implications for the "charm deficit" in $B$ decays.
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The LHCb experiment collected the world's largest sample of charmed hadrons during LHC Run 1 and Run 2. With this data set, LHCb is currently providing the world's most precise measurements of properties and production of known charmed baryons, as well as searching for many previously unobserved states. The latest results on the charmed baryons described in this document include the lifetime measurement of the $\it{\Omega}_c^0$ and $\it{\Xi}_c^0$ baryons that are produced directly from proton-proton collisions and reconstructed in the $pK^{-}K^{-}\pi^{+}$ final state. The $\it{\Omega}_c^0$ lifetime is measured to be $276.5 \pm 13.4 \text{ (stat)} \pm 4.4 \text{ (syst)} \pm 0.7 \text{ }(D^{0}) \text{ fs}$ and the $\it{\Xi}_c^0$ lifetime to be $148.0 \pm 2.3 \text{ (stat)} \pm 2.2 \text{ (syst)} \pm 0.2 \text{ }(D^{0}) \text{ fs}$. Both results are consistent with the previous LHCb measurement based on semileptonic decays of $b$-hadrons. The latest results on the charm baryons from the LHCb collaboration also include searches for the $\it{\Xi}_{cc}^{+}$ baryon in the $\it{\Xi}_{cc}^{+} \rightarrow \it{\Xi}_{c}^{+} \pi^{-} \pi^{+}$ decay, the first search for the $\it{\Omega}_{cc}^{+}$ baryon in the $\it{\Omega}_{cc}^{+} \rightarrow \it{\Xi}_{c}^{+} K^{-} \pi^{+}$ decay, and the searches for the $\it{\Xi}_{bc}^{0}$ and $\it{\Omega}_{bc}^{0}$ baryons in the $\it{\Lambda}_{c}^{+} \pi^{-}$ and $\it{\Xi}_{c}^{+} \pi^{-}$ final states. No significant signals are found for neither of these decays, therefore upper limits are set on the ratio of production cross-sections times the ratio of branching fractions with respect to their normalisation decay.
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We report on several studies of charm baryon production and decays by the BaBar collaboration. We confirm previous observations of the $\Xi_c^{'0/+}$, $\Xi_c(2980)^+$ and $\Xi_c(3077)^+$ baryons, measure branching ratios for Cabibbo-suppressed $\Lambda_c^+$ decays and use baryon decays to study the properties of the light-quark baryons, $\Omega^-$ and $\Xi(1690)^0$.
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Compared with the charmed baryons, the bottom baryons are not known very well both experimentally and theoretically. In this paper, we investigate the dipion strong decays of the P-wave and D-wave excited bottom baryons in the framework of the QPC model. We also extend the same analysis to the charmed baryons.
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