We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6 fb(-1) of integrated luminosity, we obtain the first evidence for the B(s)(0)→π(+)π(-) decay, with a significance of 3.7σ, and a measured branching ratio B(B(s)(0)→π(+)π(-))=(0.57±0.15(stat)±0.10(syst))×10(-6). A search for the B(0)→K(+)K(-) mode in the same sample yields a significance of 2.0σ, and a central value estimate B(B(0)→K(+)K(-))=(0.23±0.10(stat)±0.10(syst))×10(-6).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.108.211803 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Coarsening dynamics of aster defects in model polar active matter.
Soft Matter
December 2024
Centre for Condensed Matter Theory, Indian Institute of Science, Bangalore, Karnataka, India.
Article Synopsis
- - The study focuses on how topological defects in 2D polar active matter interact with a conserved density field, revealing unusual behavior in their distribution and movement patterns.
- - Defects initially pair-annihilate rapidly but then become stuck in a slower coarsening process, leading to a steady state defined by a power-law rate of change, unlike the typical exponential decay seen in equilibrium systems.
- - The unique defect coarsening creates specific patterns in the density field that resemble those found in biological systems, such as the actin cytoskeleton, potentially influencing cell signaling and biological functions.
Noise-aware dynamic image denoising and positron range correction for Rubidium-82 cardiac PET imaging via self-supervision.
Med Image Anal
February 2025
Department of Biomedical Engineering, Yale University, USA; Department of Radiology and Biomedical Imaging, Yale University, USA. Electronic address:
Rubidium-82 (Rb) is a radioactive isotope widely used for cardiac PET imaging. Despite numerous benefits of Rb, there are several factors that limits its image quality and quantitative accuracy. First, the short half-life of Rb results in noisy dynamic frames.
View Article and Find Full Text PDFComparative analysis of positron emitters for theranostic applications based on small bioconjugates highlighting Sc, Cu and Ti.
EJNMMI Phys
November 2024
Department of Nuclear Medicine, University Hospital of Bordeaux, Bordeaux, F-33076, France.
Background: Targeted radionuclide therapy with Lu-labelled small conjugates is expanding rapidly, and its success is linked to appropriate patient selection. Companion diagnostic conjugates are usually labelled with Ga, offering good imaging up to ≈2 h post-injection. However, the optimal tumor-to-background ratio is often reached later.
View Article and Find Full Text PDFUnderstanding the puzzle of angular momentum conservation in beta decay and related processes.
Proc Natl Acad Sci U S A
November 2024
Department of Physics and Illinois Center for Advanced Studies of the Universe, University of Illinois, Urbana, IL 61801.
We ask the question of how angular momentum is conserved in electroweak interaction processes. To introduce the problem with a minimum of mathematics, we first raise the same issue in elastic scattering of a circularly polarized photon by an atom, where the scattered photon has a different spin direction than the original photon, and note its presence in scattering of a fully relativistic spin-1/2 particle by a central potential. We then consider inverse beta decay in which an electron is emitted following the capture of a neutrino on a nucleus.
View Article and Find Full Text PDFToMCCA: a Toy Monte Carlo Coalescence Afterburner.
Eur Phys J C Part Fields
November 2024
Physics Department, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, 85748 Garching b. München, Germany.
Antinuclei in our Galaxy may stem either from annihilation or decay of dark matter, or from collisions of cosmic rays with the interstellar medium, which constitute the background of indirect dark matter searches. Understanding the formation mechanism of (anti)nuclei is crucial for setting limits on their production in space. Coalescence models, which describe the formation of light nuclei from final-state interaction of nucleons, have been widely employed in high-energy collisions.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!