0000000000293670

AUTHOR

D. Lopes Pegna

showing 3 related works from this author

Observation ofCPViolation inB→η′K0Decays

2007

We report observations of CP violation in the decays B0 -> K+pi- and B0 -> pi+pi- in a sample of 383 million Y4S -> BBbar events. We find 4372 +/- 82 B0 -> K+pi- decays and measure the direct CP-violating charge asymmetry Akpi = -0.107 +/- 0.018 (stat) +0.007-0.004 (syst), which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample we find 1139 +/- 49 B0 -> pi+pi- decays and measure the CP-violating asymmetries Spipi = -0.60 +/- 0.11 (stat) +/- 0.03 (syst) and Cpipi = -0.21 +/- 0.09 (stat) +/- 0.02 (syst). CP conservation in B0 -> pi+pi- (Spipi=Cpipi=0) is excluded at a confidence level 1-C.L. = 8 * 10^{-8}, corresponding to 5.4 standard de…

PhysicsParticle physicsAnnihilation010308 nuclear & particles physicsmedia_common.quotation_subjectElectron–positron annihilationGeneral Physics and AstronomyAsymmetry01 natural sciencesEngineering physicsParticle decayPair productionPositron0103 physical sciencesPiCP violation010306 general physicsmedia_commonBar (unit)Physical Review Letters
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Measurement ofD0−D¯0mixing using the ratio of lifetimes for the decaysD0→K−π+andK+K−

2009

We present a measurement of ${D}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{D}}^{0}$ mixing and $CP$ violation using the ratio of lifetimes simultaneously extracted from a sample of ${D}^{0}$ mesons produced through the flavor-tagged process ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}$, where ${D}^{0}$ decays to ${K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ensuremath{-}}{K}^{+}$, or ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, along with the untagged decays ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}…

Nuclear and High Energy PhysicsParticle physicsMesonElectron–positron annihilationmedia_common.quotation_subjectHadronGeneral Physics and AstronomyDalitz plotElementary particle01 natural sciencesAsymmetryMeasure (mathematics)CombinatoricsParticle decayPositronNuclear magnetic resonancePionD meson0103 physical sciencesPiB meson010306 general physicsmedia_commonPhysics010308 nuclear & particles physicsNull (mathematics)Order (ring theory)ObservableB-factoryCrystallographyPair productionCP violationBar (unit)Physical Review D
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Measurement of theγγ*→ηandγγ*→η′transition form factors

2011

We study the reactions e{sup +}e{sup -} {yields} e{sup +}e{sup -} {eta}{sup (/)} in the single-tag mode and measure the {gamma}{gamma}* {yields} {eta}{sup (/)} transition form factors in the momentum transfer range from 4 to 40 GeV{sup 2}. The analysis is based on 469 fb{sup -1} of integrated luminosity collected at PEP-II with the BABAR detector at e{sup +}e{sup -} center-of-mass energies near 10.6 GeV.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaMomentum transfer01 natural sciences7. Clean energyEngineering physicsLuminosityTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY0103 physical sciencesMass spectrumHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysical Review D
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