Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau}$ relative to $\bar{B}^0 \rightarrow D^{*+} \ell^- \bar{\nu}_{\ell}$ decays with a semileptonic tagging method

Sato, Y.; Iijima, T.; Adamczyk, K.; Aihara, H.; Asner, D.M.; Atmacan, H.; Aushev, T.; Ayad, R.; Aziz, T.; Babu, V.

doi:10.1103/PhysRevD.94.072007

Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{+} \tau^- \bar{\nu}_{\tau}$ relative to $\bar{B}^0 \rightarrow D^{+} \ell^- \bar{\nu}_{\ell}$ decays with a semileptonic tagging method

Belle

Collaboration

Jul 26, 2016

12 pages

Published in:

Phys.Rev.D 94 (2016) 7, 072007

Published: Oct 27, 2016

e-Print:

1607.07923 [hep-ex]

DOI:

10.1103/PhysRevD.94.072007

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{*}{(2010)}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

KEK-PREPRINT-2016-8,
BELLE-PREPRINT-2016-8

Experiments:

KEK-BF-BELLE

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Abstract: (APS)

We report a measurement of the ratio R(D*)=B(B¯0→D*+τ-ν¯τ)/B(B¯0→D*+ℓ-ν¯ℓ), where ℓ denotes an electron or a muon. The results are based on a data sample containing 772×106 BB¯ pairs recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider. We select a sample of B0B¯0 pairs by reconstructing both B mesons in semileptonic decays to D*∓ℓ±. We measure R(D*)=0.302±0.030(stat)±0.011(syst), which is within 1.6σ of the Standard Model theoretical expectation, where the standard deviation σ includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.

Note:

12 pages, 15 figures, supplemental material (6 pages, 35 figures), submitted to Physical Review D

electron positron: annihilation
electron positron: colliding beams
B: pair production
anti-B0: semileptonic decay
anti-B0: branching ratio: measured
branching ratio: ratio
Upsilon(10570): electroproduction
new physics
BELLE
KEK-B

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Measurement of the branching ratio of Bˉ0→D∗+τ−νˉτ\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau}Bˉ0→D∗+τ−νˉτ​ relative to Bˉ0→D∗+ℓ−νˉℓ\bar{B}^0 \rightarrow D^{*+} \ell^- \bar{\nu}_{\ell}Bˉ0→D∗+ℓ−νˉℓ​ decays with a semileptonic tagging method

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Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{+} \tau^- \bar{\nu}_{\tau}$ relative to $\bar{B}^0 \rightarrow D^{+} \ell^- \bar{\nu}_{\ell}$ decays with a semileptonic tagging method