• Open Access

Closing the gap on RD* by including longitudinal effects

J. E. Chavez-Saab and Genaro Toledo
Phys. Rev. D 98, 056014 – Published 17 September 2018; Erratum Phys. Rev. D 99, 099901 (2019)

Abstract

Measurements of the RD*Br(BτνD*)/Br(BeνD*) parameter remain in tension with the standard model prediction, despite recent results helping to close the gap. The standard model prediction it is compared with considers the D* as an external particle, even though what is detected in experiments is a Dπ pair it decays into, from which it is reconstructed. We argue that the experimental result must be compared with the theoretical prediction considering the full four-body decay (BlνD*lνDπ). We show that the longitudinal degree of freedom of the off shell D* helps to further close the disagreement gap with experimental data. We find values for the ratio RDπlBr(BτντDπ)/Br(BlνlDπ) of RDπe=0.274±0.003 and RDπμ=0.275±0.003, where the uncertainty comes from the uncertainty of the form factors parameters. Comparing against RDπ reduces the gap with the latest LHCb result from 1.1σ to 0.48σ, while the gap with the latest Belle result is reduced from 0.42σ to just 0.10σ and with the world average results from 3.7σ to 2.1σ.

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  • Received 18 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.056014

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Erratum

Erratum: Closing the gap on RD* by including longitudinal effects [Phys. Rev. D 98, 056014 (2018)]

J. E. Chavez-Saab and Genaro Toledo
Phys. Rev. D 99, 099901 (2019)

Authors & Affiliations

J. E. Chavez-Saab and Genaro Toledo

  • Instituto de Fisica, Universidad Nacional Autonoma de Mexico, AP20-364, Ciudad de Mexico 01000, Mexico

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Issue

Vol. 98, Iss. 5 — 1 September 2018

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