0000000000140021

AUTHOR

E. Nakano

showing 6 related works from this author

Search for an Invisibly Decaying Z′ Boson at Belle II in e+e−→μ+μ−(e±μ∓) Plus Missing Energy Final States

2020

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z′. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z′ in the process e+e-→μ+μ-Z′ and of a lepton-flavor-violating Z′ in e+e-→e±μZ′. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an Lμ-Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10-2-1 for MZ′≤6 GeV/c2.

PhysicsCoupling constantParticle physicsMissing energyPhysics beyond the Standard ModelGeneral Physics and Astronomy01 natural scienceslaw.inventionlaw0103 physical sciencesHigh Energy Physics::Experiment010306 general physicsColliderBosonPhysical Review Letters
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First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

2018

We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B^{0}→D^{(*)}h^{0} with D→K_{S}^{0}π^{+}π^{-} decays, where h^{0}∈{π^{0},η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6}BB[over ¯] pairs recorded by the BABAR detector and (772±11)×10^{6}BB[over ¯] p…

QuarkPhysicsParticle physicsUnitarity010308 nuclear & particles physicsElectron–positron annihilationHadronGeneral Physics and AstronomyDalitz plot01 natural sciencesB-factoryKEKB0103 physical sciencesCP violation010306 general physicsPhysical Review Letters
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A method for the incorporation of radioactive isotopes in the sea urchin egg.

1957

Con la iniezione di 10–20µc di Metionina-S35 nella cavita celomatica di femmine adulte diParacentrotus lividus si ottiene una rapida ed efficiente incorporazione dell'isotopo nelle uova. Si discutono i vantaggi del metodo rispetto a quello attualmente in uso.

PharmacologyRadioisotopesRadionuclidebiologyCell BiologyFisheryCellular and Molecular NeuroscienceIsotopesEnvironmental chemistrybiology.animalSea UrchinsMolecular MedicineAnimalsMolecular BiologySea urchinOvumExperientia
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On the incorporation of S35-methionine in artificially activated sea urchin eggs

1958

Metionina-S35 e stata incorporata in uova vergini diParacentrotus lividus. In queste l'isotopo si trova per la piu gran parte nella frazione solubile in acido tricloracetico al 10%. Attivando le uova partenogeneticamente con acido butirrico si osserva una progressiva perdita di attivita di questa frazione ed una rapida incorporazione nei mitocondri. L'andamento del fenomeno e del tutto identico a quello gia descritto (Nakano eMonroy) nelle uova normalmente fecondate.

PharmacologyCellular and Molecular Neurosciencechemistry.chemical_compoundMethioninebiologychemistrybiology.animalBotanyMolecular MedicineCell BiologyMolecular BiologySea urchinAquatic organismsExperientia
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First Observation ofCPViolation inB¯0→DCP(*)h0Decays by a Combined Time-Dependent Analysis ofBABARand Belle Data

2015

We report a measurement of the time-dependent CP asymmetry of B0->D(*)CP h0 decays, where the light neutral hadron h0 is a pi0, eta or omega meson, and the neutral D meson is reconstructed in the CP eigenstates K+ K-, K0S pi0 or K0S omega. The measurement is performed combining the final data samples collected at the Y(4S) resonance by the BaBar and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain ( 471 +/- 3 ) x 10^6 BB pairs recorded by the BaBar detector and ( 772 +/- 11 ) x 10^6, BB pairs recorded by the Belle detector. We measure the CP asymmetry parameters -eta_f S = +0.66 +/- 0.10 (stat.) +/- 0.06 (syst.) an…

PhysicsParticle physicsMeson010308 nuclear & particles physicsmedia_common.quotation_subjectHadronGeneral Physics and Astronomy01 natural sciencesOmegaAsymmetryB-factoryNuclear physicsKEKB0103 physical sciencesD mesonCP violation010306 general physicsmedia_commonPhysical Review Letters
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Some observations on the metabolism of S35-methionine during development of the sea urchin eggs

1958

Si e studiato il metabolismo della metionina-S35 nella frazione non-proteica (TCA-solubile) nel corso dello sviluppo diParacentrotus lividus.

PharmacologyMethionineMethionine metabolismBiochemical PhenomenaCell BiologyMetabolismBiologyFisheryCellular and Molecular Neurosciencechemistry.chemical_compoundMethionineBiochemistrychemistrySea Urchinsbiology.animalAnimalsMolecular MedicineMolecular BiologySea urchinEchinodermataExperientia
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