Project description
Measurements of key parameters during tau lepton decay could point to new physics
The Standard Model of particle physics, developed in the 1970s and having changed little since then, posits that the universe is made of 12 elementary matter particles, six quarks and six leptons. The best-known lepton is the electron, negatively charged and with a very small mass. There are two more negatively charged leptons, the muon and the tau, with much larger masses than the electrons, and three neutral neutrinos. A key assumption of the Standard Model is that the interactions of charged leptons differ due to their mass variability. Recent studies of B meson decays involving the tau lepton challenge that notion. The EU-funded B2DTauNu project is conducting pioneering measurements of important properties of semileptonic B meson decays involving tau leptons from experimental data. The results could pave the way for enhanced high-precision measurements in the future, with implications for the Standard Model and our understanding of the universe.
Objective
The project will characterise the physics of semileptonic b -> c tau nu quark transitions, by studying the angular properties of B -> D(*) tau nu meson decays. The branching fractions of B -> D(*) tau nu decays are measured to be larger than expected relative to their B -> D(*) mu nu counterparts, offering an intriguing hint of beyond the Standard Model (SM) physics in the form of lepton universality violation. Due to the spin structure of B -> D(*) tau nu decays, the full decay rate is described by a sum of twelve angular terms each with a corresponding coefficient. The values of these coefficients can be altered by New Physics (NP) operators such as charged Higgs bosons, Z' bosons, or leptoquarks, and measuring their values thus provides a powerful probe to search for deviations from the SM.
The project will use LHCb Run 1 and 2 data to measure the B -> D(*) tau nu angular coefficients and signal yields in a model-independent manner, making use of novel binned template fit methods that fully account for resolution effects caused by the missing neutrino information. The measurements made will be a ground-breaking proof-of-principal, paving the way for high-precision angular coefficient measurements in future.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences theoretical physics particle physics neutrinos
- natural sciences physical sciences theoretical physics particle physics leptons
- natural sciences physical sciences theoretical physics particle physics quarks
- natural sciences physical sciences theoretical physics particle physics higgs bosons
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions
MAIN PROGRAMME
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H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
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Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) H2020-MSCA-IF-2019
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
1015 Lausanne
Switzerland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.