Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">CP</mml:mi></mml:math>Violation in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Meson System
Why is this work in the frame?
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
Machine scores (provisional)
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
- Teacher spread
- 0.236 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
We present an updated measurement of time-dependent $\mathrm{CP}$-violating asymmetries in neutral $B$ decays with the BABAR detector at the PEP-II asymmetric $B$ Factory at SLAC. This result uses an additional sample of $\ensuremath{\Upsilon}(4S)$ decays collected in 2001, bringing the data available to $32\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs. We select events in which one neutral $B$ meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral $B$ meson is determined from its decay products. The amplitude of the $\mathrm{CP}$-violating asymmetry, which in the standard model is proportional to $\mathrm{sin}2\ensuremath{\beta}$, is derived from the decay time distributions in such events. The result $\mathrm{sin}2\ensuremath{\beta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.59\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst})$ establishes $\mathrm{CP}$ violation in the ${B}^{0}$ meson system. We also determine $|\ensuremath{\lambda}|\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.93\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{syst})$, consistent with no direct $\mathrm{CP}$ violation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
The record
- Venue
- Physical Review Letters
- Topic
- Particle physics theoretical and experimental studies
- Field
- Physics and Astronomy
- Canadian institutions
- —
- Funders
- Institut National de Physique Nucléaire et de Physique des ParticulesInstitute of High Energy PhysicsNatural Sciences and Engineering Research Council of CanadaCentre National de la Recherche ScientifiqueSLAC National Accelerator LaboratoryAlexander von Humboldt-StiftungBundesministerium für Bildung und ForschungAlfred P. Sloan FoundationU.S. Department of EnergyNational Science Foundation
- Keywords
- PhysicsParticle physicsCP violationMesonB mesonAsymmetryB-factoryAmplitudeHadronNuclear physicsStandard Model (mathematical formulation)Electron–positron annihilationLambdaQuantum mechanics
- Has abstract in OpenAlex
- yes