Use of B → h +h 0− as control channels for the measurement of BR(B0 s → µ +µ −) at LHCb

Documentos apresentados no âmbito do reconhecimento de graus e diplomas estrangeiro

Prospect for measuring the branching ratio of Bs→μμB_{s}\to\mu\mu at LHCb

The Standard Model predicts a branching ratio for the decay mode Bs -> mu mu of (3.4 +/- 0.5)10e-9, while some SUSY models predict enhancements up to 2 orders of magnitude. It is expected that at the end of its life Tevatron will set and exclusion limit for this branching ratio of the order of 10e-8, leaving one order of magnitude to explore. The excellent vertex reconstruction, invariant mass resolution and muon identification of the LHCb detector make it well suited to observe a branching ratio in this range in the first years of running of LHC. In this article an overview of the analysis that has been developed for the measurement of this branching ratio is presented. The event selection and the statistical tools used for the extraction of the branching ratio are discussed. A special stress is put on the use of control channels for calibration and normalization in order to make the analysis as independent of simulation as possible. Finally, the expected performance in terms of exclusion and observation significance are given for a set of values of integrated luminosities

Terrestrial Very-Long-Baseline Atom Interferometry Workshop (TVLBAI 2023)

This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more km-scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions