Model-independent analysis of semileptonic $B$ decays to $D^{**}$ for arbitrary new physics

Journal Article · Thu Apr 12 00:00:00 EDT 2018 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.97.075011· OSTI ID:1432900

Bernlochner, Florian U.; Ligeti, Zoltan; Robinson, Dean J.

We explore semileptonic B decays to the four lightest excited charm mesons, D**={D₀*,D₁*,D₁,D₂*}, for nonzero charged lepton mass and for all b → cℓ$$\bar{\nu }$$ four-Fermi interactions, including calculation of the O(Λ_QCD/m_c,b) and O(α_s) corrections to the heavy quark limit for all form factors. In the heavy quark limit, some form factors are suppressed at zero recoil; therefore, the O(Λ_QCD/m_c,b) corrections can be very important. The D** rates exhibit sensitivities to new physics in b → cτ$$\bar{\nu }$$ mediated decays complementary to the D and D* modes. Since they are also important backgrounds to B→D^(∗)τ$$\bar{\nu }$$, the correct interpretation of future semitauonic B→D^(∗) rate measurements requires consistent treatment of both the D** backgrounds and the signals. Our results allow more precise and more reliable calculations of these B→D**ℓ$$\bar{\nu }$$ decays and are systematically improvable by better data on the e and μ modes. As an example, we show that the D** rates are more sensitive to a new $$\bar{c}$$ σ_μνb tensor interaction than the D^(∗) rates.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1432900
• Alternate ID(s): OSTI ID: 1462969
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 97 Journal Issue: 7; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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