Journal Article PUBDB-2022-06295

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Measurement of the branching fraction and $CP$ asymmetry for $B\to\bar{D}^{0} \pi$ decays

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2022
Inst. Melville, NY

Physical review / D 105(7), 072007 () [10.1103/PhysRevD.105.072007]
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Report No.: Belle Preprint 2021-17; KEK Preprint 2021-15; arXiv:2111.12337

Abstract: We measure the branching fractions and $CP$ asymmetries for the decays $B^{0}\to \bar{D}^{0}\pi^{0}$ and $B^{+}\to \bar{D}^{0}\pi^{+}$, using a data sample of $772\times 10^{6}$$B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^{+}e^{-}$ collider. The branching fractions obtained and direct $CP$ asymmetries are $\mathcal{B}(B^{0}\to \bar{D}^{0}\pi^{0}) = [2.70 \pm 0.06~ \text{(stat.)} \pm 0.10~ \text{(syst.)}] \times 10^{-4}$, $\mathcal{B}(B^{+}\to \bar{D}^{0}\pi^{+}) = [4.53 \pm 0.02~ \text{(stat.)} \pm 0.15~ \text{(syst.)}] \times 10^{-3}$, $ {\cal A}_{CP}(B^{0}\to \bar{D}^{0}\pi^{0}) = [+0.42 \pm 2.05~ \text{(stat.)} \pm 1.22~ \text{(syst.)}]\%$, and $ {\cal A}_{CP}(B^{+}\to \bar{D}^{0}\pi^{+}) = [+0.19 \pm 0.36~ \text{(stat.)} \pm 0.57~ \text{(syst.)}]\%$. The measurements of $\mathcal{B}$ are the most precise to date and are in good agreement with previous results, as is the measurement of ${\cal A}_{CP}(B^{+}\to \bar{D}^{0}\pi^{+})$. The measurement of ${\cal A}_{CP}$ for $B^{0}\to \bar{D}^{0}\pi^{0}$ is the first for this mode, and the value is consistent with Standard Model expectations.

Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; B0: hadronic decay ; B+: hadronic decay ; B0: branching ratio ; B+: branching ratio ; branching ratio: ratio: measured ; asymmetry: CP ; CP: violation ; BELLE ; KEK-B ; Upsilon(10570): electroproduction ; experimental results ; B0 --> anti-D0 pi0 ; B+ --> anti-D0 pi+

Classification:

Note: ISSN 2470-0029 not unique: **2 hits**.Phys. Rev. D 105, 072007 (2022). 13 pages, 4 captioned figures, plus supplemental material. Accepted by Phys. Rev. D. Updated for typos and clarity based on journal review

Contributing Institute(s):
  1. BELLE II Experiment (BELLE)
Research Program(s):
  1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
Experiment(s):
  1. KEK: BELLE I/II

Appears in the scientific report 2022
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Measurement of the branching fraction and $CP$ asymmetry for $B\to\bar{D}^{0} \pi$ decays
[10.3204/PUBDB-2021-05244]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


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