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Lifetime of Bc− Mesons Constrains Explanations for Anomalies in B → D ( ) τν

Alonso, Rodrigo ; Grinstein, Benjamín ; Martin Camalich, Jorge

Physical review letters, 2017-02, Vol.118 (8) [Periódico revisado por pares]

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Título:
Lifetime of Bc− Mesons Constrains Explanations for Anomalies in B → D ( ) τν
Autor: Alonso, Rodrigo ; Grinstein, Benjamín ; Martin Camalich, Jorge
Assuntos: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
É parte de: Physical review letters, 2017-02, Vol.118 (8)
Notas: USDOE Office of Science (SC), High Energy Physics (HEP)
SC0009919; sc0009919
Descrição: Here, we investigate a new constraint on new-physics interpretations of the anomalies observed in B→D(*)τν decays making use of the lifetime of the B$-\atop{c}$ meson. A constraint is obtained by demanding that the rate for B$-\atop{c}$→τ-$-\atop{v}$ does not exceed the fraction of the total width that is allowed by the calculation of the lifetime in the standard model. This leads to a very strong bound on new-physics scenarios involving scalar operators since they lift the slight, but not negligible, chiral suppression of the B$-\atop{c}$→τ-$-\atop{v}$ amplitude in the standard model. The new constraint renders a scalar interpretation of the enhancement measured in RD* implausible, including explanations implementing extra Higgs doublets or certain classes of leptoquarks. We also discuss the complementarity of RD(*) and a measurement of the longitudinal polarization of the τ in the B→D*τν decay in light of our findings.
Editor: United States: American Physical Society (APS)
Idioma: Inglês

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