Search results for "B-factor"

showing 10 items of 88 documents

Search forCPTand Lorentz Violation inB0−B¯0Oscillations with Dilepton Events

2008

We report results of a search for CPT and Lorentz violation in B{sup 0}-{bar B}{sup 0} oscillations using inclusive dilepton events from 232 million {Upsilon}(4S) {yields} B{bar B} decays recorded by the BABAR detector at the PEP-II B Factory at SLAC. We find 2.8{sigma} significance, compatible with no signal, for variations in the complex CPT violation parameter z at the Earth's sidereal frequency and extract values for the quantities {Delta}a{sub {mu}} in the general Lorentz-violating standard-model extension. The spectral powers for variations in z over the frequency range 0.26 year{sup -1} to 2.1 day{sup -1} are also compatible with no signal.

PhysicsParticle physics010308 nuclear & particles physicsCPT symmetryLorentz transformationElectron–positron annihilationGeneral Physics and AstronomySigmaLorentz covariance01 natural sciencesStandard ModelB-factoryNuclear physicssymbols.namesakeParticle decay0103 physical sciencessymbols010306 general physicsPhysical Review Letters
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Bound on the Ratio of Decay Amplitudes forB¯0→J/ψK*0andB0→J/ψK*0

2004

We have measured the time-dependent decay rate for the process B→J/ψK*0(892) in a sample of about 88×106 Υ(4S)→BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. In this sample we study flavor-tagged events in which one neutral B meson is reconstructed in the J/ψK*0 or J/ψK *0 final state. We measure the coefficients of the cosine and sine terms in the time-dependent asymmetries for J/ψK*0 and J/ψK *0, find them to be consistent with the standard model expectations, and set upper limits at 90% confidence level (C.L.) on the decay amplitude ratios |A(B 0→J/ψK*0)|/|A(B0→J/ψK*0)|<0.26 and |A(B0→J/ψK *0)|/|A(B 0→J/ψK *0)|<0.32. For a single ratio of w…

PhysicsParticle physicsAmplitude010308 nuclear & particles physicsQuantum mechanics0103 physical sciencesGeneral Physics and AstronomyCP violationB meson010306 general physics01 natural sciencesStandard ModelB-factoryPhysical Review Letters
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CPAsymmetries inB0Decays in the Left-Right Model

1998

We study time dependent CP asymmetries in B^0_{d,s} decays in the left-right model with spontaneous breakdown of CP. Due to the new contributions to B^0-\bar B^0 mixing the CP asymmetries can be substantially modified. Moreover, there can be significant new contributions to the $B$-meson decay amplitudes from the magnetic penguins. Most promising for detection of the new physics in the planned $B$ factories is that the CP asymmetries in the decays B--> J/\psi K_S and B--> \phi K_S which are supposed to be equal in the standard model can differ significantly in this class of models independently of the results in the measurements of B--> X_s \gamma.

PhysicsParticle physicsAmplitudePhysics beyond the Standard ModelSpontaneous symmetry breakingGeneral Physics and AstronomyCP violationHigh Energy Physics::ExperimentAtomic physicsMixing (physics)Standard ModelB-factoryBar (unit)Physical Review Letters
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Observation of an Excited Charm BaryonΩc*Decaying toΩc0γ

2006

We report the first observation of an excited singly-charm baryon OmegaC* (css) in the radiative decay OmegaC0 Gamma, where the OmegaC0 baryon is reconstructed in the decays to the final states Omega-pi+, Omega-pi+pi0, Omega-pi+pi-pi+, and Cascade-K-pi+pi+. This analysis is performed using a dataset of 230.7 fb$-1} collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. The mass difference between the OmegaC* and the OmegaC0 baryons is measured to be 70.8 +/- 1.0 (stat) +/- 1.1 (syst) MeV/c2. We also measure the ratio of inclusive production cross sections of OmegaC* and OmegaC0 in e+e- annihilation.

PhysicsParticle physicsAnnihilation010308 nuclear & particles physicsElectron–positron annihilationGeneral Physics and Astronomy01 natural sciences7. Clean energyB-factoryCharmed baryonsBaryonNuclear physicsParticle decayPositronPair production0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysical Review Letters
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Study of Time-DependentCPAsymmetry in NeutralBDecays toJ/ψπ0

2003

We present the first study of the time-dependent CP-violating asymmetry in B0-->J/psi pi(0) decays using e(+)e(-) annihilation data collected with the BABAR detector at the Upsilon(4S) resonance during the years 1999-2002 at the PEP-II asymmetric-energy B Factory at SLAC. Using approximately 88 x 10(6) BB; pairs, our results for the coefficients of the cosine and sine terms of the CP asymmetry are C(J/psi pi(0))=0.38+/-0.41(stat)+/-0.09(syst) and S(J/psi pi(0))=0.05+/-0.49(stat)+/-0.16(syst).

PhysicsParticle physicsAnnihilation010308 nuclear & particles physicsmedia_common.quotation_subjectGeneral Physics and AstronomyResonanceAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesAsymmetryB-factoryNuclear physicsParticle decay0103 physical sciencesPiHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary Astrophysics010306 general physicsmedia_commonPhysical Review Letters
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Measurement of the Time-DependentCPAsymmetry inB0→DCP(*)h0Decays

2007

We report a measurement of the time-dependent CP-asymmetry parameters S and C in color-suppressed B-0 -> D((*)0)h(0) decays, where h(0) is a pi(0), eta, or omega meson, and the decays to one of the CP eigenstates K+K-, K-S(0)pi(0), or K-S(0)omega. The data sample consists of 383x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The results are S=-0.56 +/- 0.23 +/- 0.05 and C=-0.23 +/- 0.16 +/- 0.04, where the first error is statistical and the second is systematic.

PhysicsParticle physicsAnnihilationMeson010308 nuclear & particles physicsElectron–positron annihilationGeneral Physics and Astronomy01 natural sciencesOmegaB-factoryNuclear physicsParticle decayPair production0103 physical sciencesCP violation010306 general physicsPhysical Review Letters
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Precise Measurement of thee+e−→π+π−(γ)Cross Section with the Initial State Radiation Method atBABAR

2009

A precise measurement of the cross section for the process e^+e^- → K^+K^-(γ) from threshold to an energy of 5 GeV is obtained with the initial-state radiation (ISR) method using 232  fb^(-1) of data collected with the BABAR detector at e^+e^- center-of-mass energies near 10.6 GeV. The measurement uses the effective ISR luminosity determined from the e^+e^- → μ^+μ^-(γ)γ_(ISR) process with the same data set. The corresponding lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is found to be a_μ^(KK,LO)=(22.93 ± 0.18_(stat) ± 0.22_(syst))×10^(-10). The charged kaon form factor is extracted and compared to previous results. Its magnitude at large en…

PhysicsParticle physicsAnnihilationMuonMeson010308 nuclear & particles physicsElectron–positron annihilationGeneral Physics and Astronomy01 natural sciencesB-factoryNuclear physicsPionPair production0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsLeptonPhysical Review Letters
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Molecular interpretation of the XYZ states

2012

We study the vector – vector system including all the possible channels with quantum numbers charm = 0, strangeness = 0 around the energy region of 4000 MeV. New states with hidden charm around 4000MeV have been discovered by the B factories. They are intriguingly close to the D*D¯*${D^*}{ar D^*}$ and Ds*D¯s*$D_s^*ar D_s^*$ thresholds and do not have the properties of the charmonium states.We study the possible formation of D*D¯*${D^*}{ar D^*}$ and Ds*D¯s*$D_s^*ar D_s^*$ bound states in the framework of the Hidden Gauge formalism and discuss some of the models that favor the molecular assumption of some XYZ states: The hidden gauge formalism, Heavy baryon Chiral Perturbation Theory and the …

PhysicsParticle physicsHeavy baryon chiral perturbation theoryHigh Energy Physics::LatticePhysicsQC1-999High Energy Physics::PhenomenologyStrangenessB-factoryFormalism (philosophy of mathematics)Bound stateAstrophysics::Solar and Stellar AstrophysicsVector systemHigh Energy Physics::ExperimentNuclear ExperimentEPJ Web of Conferences
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Search for Invisible Decays of theΥ(1S)

2009

We search for invisible decays of the Upsilon(1S) meson using a sample of 91.4 x 10(6) Upsilon(3S) mesons collected at the BABAR/PEP-II B factory. We select events containing the decay Upsilon(3S) --> pi(+)pi(-)Upsilon(1S) and search for evidence of an undetectable Upsilon(1S) decay recoiling against the dipion system. We set an upper limit on the branching fraction B(Upsilon(1S) --> invisible) < 3.0 x 10(-4) at the 90% confidence level.

PhysicsParticle physicsMeson010308 nuclear & particles physicsBranching fractionElectron–positron annihilationGeneral Physics and Astronomy01 natural sciencesB-factoryNuclear physicsParticle decayPion0103 physical sciencesCP violationB meson010306 general physicsPhysical Review Letters
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Evidence for theηb(1S)Meson in RadiativeΥ(2S)Decay

2009

We have performed a search for the eta_b(1S) meson in the radiative decay of the Upsilon(2S) resonance using a sample of 91.6 million Upsilon(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E_gamma = 610.5 {+4.5} {-4.3} (stat) +/- 1.8 (syst) MeV, corresponding to an eta_b(1S) mass of 9392.9 {+4.6} {-4.8} (stat) +/- 1.9 (syst) MeV/c^2. The branching fraction for the decay Upsilon(2S) --> gamma eta_b(1S) is determined to be (4.2 {+1.1} {-1.0} (stat) +/- 0.9 (syst)) x 10^(-4). The ratio B(Upsilon(2S) --> gamma eta_b(1S))/B(Upsilon(3S) --> gamma eta_b(1S)) = 0.89 {+0.25} {-0.23} (…

PhysicsParticle physicsMeson010308 nuclear & particles physicsBranching fractionElectron–positron annihilationHadronGeneral Physics and AstronomyElementary particlePhoton energy01 natural sciencesB-factoryNuclear physicsParticle decay0103 physical sciences010306 general physicsPhysical Review Letters
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