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Título del libro: Proceedings Of The 54th Rencontres De Moriond - 2019 Electroweak Interactions And Unified Theories, Ew 2019
Título del capítulo: RD* or RDp: Closing the theoretical gap?

Autores UNAM:
MARXIL SANCHEZ GARCIA; GENARO TOLEDO SANCHEZ;
Autores externos:

Idioma:

Año de publicación:
2020
Palabras clave:

Degrees of freedom (mechanics); Degree of freedom; Form factors; Measurements of; New physics; The standard model; Forecasting


Resumen:

Measurements of the RD* parameter remain in tension with the standard model prediction, despite recent results helping to close the gap. In this work, we revisit the standard model considerations for the prediction. We pay particular attention to the theoretical prediction considering the full 4-body decay (B ? l?D* ? l?Dp), which introduces the longitudinal degree of freedom of the D*. We show that this does not introduce sizeable effects at the current precision. This modifies our previous finding (Phys. Rev. D 98 056014 (2018)) where a numerical bug led us to a different conclusion. Thus, the results on RDp are consistent with RD*, and the difference between the several values can be traced back to the form factor used and the restrictions incorporated to determine their parameters. There is still tension between the experimental world average and the most accurate theoretical estimate, leaving the possibility of presence of new physics scenarios open. © 2019 CERN for the benefit of the ATLAS and CMS Collaborations. CC-BY-4.0 license.


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