Charged Current b → cτ̅ν_τ Anomalies in a General W' Boson Scenario

Gomez, John D. Y Quintero, Néstor Y Rojas, Eduardo (2019) Charged Current b → cτ̅ν_τ Anomalies in a General W' Boson Scenario. In: MOCa 2019: Materia Oscura en Colombia, 7 de octubre de 2019, Bogotá.

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Resumen

Very recent experimental information obtained from the Belle experiment, along with that accumulated by the BABAR and LHCb experiments, has shown the existence of anomalies in the ratios R(D) and R(D∗) associated with the charged-current transition b → cτ̅ν_τ . Although the Belle measurements are in agreement with the standard model (SM) predictions, the new experimental world averages still exhibit a tension. In addition, the D∗ longitudinal polarization FL(D∗) related with the channel B → D∗τ ̄ντ observed by the Belle Collaboration and the ratio R(J/ψ) measured by the LHCb Collaboration also show discrepancies with their corresponding SM estimations. We present a model-independent study based on the most general effective Lagrangian that yields a tree-level effective contribution to the transition b → cτ ̄ντ induced by a general W ′ boson. Instead of considering any specific new physics (NP) realization, we perform an analysis by considering all of the different chiral charges to the charm-bottom and τ -ντ nteraction terms with a charged W ′ boson that explain the anomalies. We present a phenomenological study of parameter space allowed by the new experimental b → cτ ̄ντ data and ith the mono-tau signature pp → τhX + MET at the LHC. For comparison we include some of the W ′ boson NP realizations hat have already been studied in the literature.

Tipo de Elemento:	Conferencia o Taller artículo (Paper)
Asunto:	Q Ciencias > QC Physics
Division:	Facultad de Ciencias Exactas y Naturales > Programa de Física > Eventos
Depósito de Usuario:	Prof. Eduardo Rojas
Fecha Deposito:	23 May 2022 21:43
Ultima Modificación:	23 May 2022 21:43
URI:	http://sired.udenar.edu.co/id/eprint/6135

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