Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
| Autor: | Florian U. Bernlochner, Manuel Franco Sevilla, Dean J. Robinson, Guy Wormser |
|---|---|
| Přispěvatelé: | Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
p p: scattering
Fluids & Plasmas review General Physics and Astronomy FOS: Physical sciences anomaly BELLE B: branching ratio: measured electron positron: annihilation High Energy Physics - Experiment lepton: branching ratio: measured High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) lepton: flavor: universality [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] tau: branching ratio: measured D: branching ratio: measured new physics: search for lepton: flavor: violation semileptonic decay electron positron: colliding beams tension D*(2010): excited state LHC-B High Energy Physics - Phenomenology CERN LHC Coll down: branching ratio: measured correlation [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] Physical Sciences lepton: universality: violation High Energy Physics::Experiment p p: colliding beams experimental results |
| Zdroj: | Reviews of Modern Physics, vol 94, iss 1 |
| Popis: | The study of lepton flavor universality violation (LFUV) in semitauonic $b$-hadron decays has become increasingly important in light of longstanding anomalies in their measured branching fractions, and the very large datasets anticipated from the LHC and Belle II. In this review, we undertake a comprehensive survey of the experimental environments and methodologies for semitauonic LFUV measurements at the $B$-factories and LHCb, along with a concise overview of the theoretical foundations and predictions for a wide range of semileptonic decay observables. We proceed to examine the future prospects to control systematic uncertainties down to the percent level, matching the precision of Standard Model (SM) predictions. Furthermore, we discuss new perspectives and caveats on combinations of the LFUV data and revisit the world averages for the ${\cal R}(D^{(*)})$ ratios. Here we demonstrate that different treatments for the correlations of uncertainties from $D^{**}$ excited states can vary the current $3\sigma$ tension with the SM within a $1\sigma$ range. Prior experimental overestimates of $D^{**}\tau\nu$ contributions may further exacerbate this. The precision of future measurements is also estimated; their power to exploit full differential information, and solutions to the inherent difficulties in self-consistent new physics interpretations of LFUV observables, are briefly explored. Comment: Published version plus an additional subsection on the new R(Lc) results |
| Databáze: | OpenAIRE |
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