The branching fraction ratios of anti-B0 → D+ τ− anti-ντ and anti-B0 → D*+ τ− anti-ντ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb^−1 collected by the LHCb experiment in proton-proton collisions at √s = 13 TeV. The reconstructed final states are formed by combining D+ mesons with τ− → μ− anti-νμ ντ candidates, where the D+ is reconstructed via the D+ → K− π+ π+ decay. The results are R(D+) = 0.249 ± 0.043 ± 0.047, R(D*+) = 0.402 ± 0.081 ± 0.085, where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of −0.39 and are compatible with the Standard Model.

Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays. PHYSICAL REVIEW LETTERS, 134(6), 1-13 [10.1103/physrevlett.134.061801].

Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2025

Abstract

The branching fraction ratios of anti-B0 → D+ τ− anti-ντ and anti-B0 → D*+ τ− anti-ντ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb^−1 collected by the LHCb experiment in proton-proton collisions at √s = 13 TeV. The reconstructed final states are formed by combining D+ mesons with τ− → μ− anti-νμ ντ candidates, where the D+ is reconstructed via the D+ → K− π+ π+ decay. The results are R(D+) = 0.249 ± 0.043 ± 0.047, R(D*+) = 0.402 ± 0.081 ± 0.085, where the first uncertainties are statistical and the second systematic. The two measurements have a correlation coefficient of −0.39 and are compatible with the Standard Model.
2025
Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., et al. (2025). Measurement of the Branching Fraction Ratios R(D+) and R(D*+) Using Muonic τ Decays. PHYSICAL REVIEW LETTERS, 134(6), 1-13 [10.1103/physrevlett.134.061801].
Aaij, R.; Abdelmotteleb, A.  S.  W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006901
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