Measurements of Branching Fractions for B0 --> Ds+pi- and B0-bar --> Ds+K-

A. Das; et al; The Belle Collaboration

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Measurements of Branching Fractions for B0 --> Ds+pi- and B0-bar --> Ds+K-

The Belle Collaboration, A. Das, et al

High Energy Physics - Experiment · Submitted 27 Jul 2010

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim The results are BF(B0 --> Ds+pi-) = (1.99 +/- 0.26 +/- 0.18)x10^-5 and BF(B0-bar --> Ds+K-) = (1.91 +/- 0.24 +/- 0.17)x10^-5, where the uncertainties are statistical and systematic, respectively.

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arXiv ID1007.4619 (version 2)

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CitationA. Das, et al, The Belle Collaboration. "Measurements of Branching Fractions for B0 --> Ds+pi- and B0-bar --> Ds+K-." arXiv:1007.4619 (2010). https://pith.science/paper/UZCYYV6B

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We present improved measurements of the branching fractions for the decays B0 --> Ds+pi- and B0-bar --> Ds+K- using a data sample of 657x10^6 BB-bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The results are BF(B0 --> Ds+pi-) = (1.99 +/- 0.26 +/- 0.18)x10^-5 and BF(B0-bar --> Ds+K-) = (1.91 +/- 0.24 +/- 0.17)x10^-5, where the uncertainties are statistical and systematic, respectively. Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0 --> D+pi- and the Cabibbo favored decay B0 --> D-pi+, R_Dpi = [1.71 +/- 0.11(stat) +/- 0.09(syst) +/- 0.02(theo)]%, where the last term denotes the theory error.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We present improved measurements of the branching fractions for the decays B0 --> Ds+pi- and B0-bar --> Ds+K- using a data sample of 657x10^6 BB-bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.	contribution 0.75	0.95	0.07	asserted 1.00
s1	The results are BF(B0 --> Ds+pi-) = (1.99 +/- 0.26 +/- 0.18)x10^-5 and BF(B0-bar --> Ds+K-) = (1.91 +/- 0.24 +/- 0.17)x10^-5, where the uncertainties are statistical and systematic, respectively.	result 1.00	0.97	0.70	asserted 1.00
s2	Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0 --> D+pi- and the Cabibbo favored decay B0 --> D-pi+, R_Dpi = [1.71 +/- 0.11(stat) +/- 0.09(syst) +/- 0.02(theo)]%, where the last term denotes the theory error.	result 0.98	0.95	0.35	asserted 1.00

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Original abstract

We present improved measurements of the branching fractions for the decays B0 --> Ds+pi- and B0-bar --> Ds+K- using a data sample of 657x10^6 BB-bar events collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The results are BF(B0 --> Ds+pi-) = (1.99 +/- 0.26 +/- 0.18)x10^-5 and BF(B0-bar --> Ds+K-) = (1.91 +/- 0.24 +/- 0.17)x10^-5, where the uncertainties are statistical and systematic, respectively. Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0 --> D+pi- and the Cabibbo favored decay B0 --> D-pi+, R_Dpi = [1.71 +/- 0.11(stat) +/- 0.09(syst) +/- 0.02(theo)]%, where the last term denotes the theory error.

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To understand the origin of this discrepancy we looked in the original paper by the Belle Collaboration [ref] , and realized that the value for $B(B^0→D^+π^-)$ quoted by PDG, and given in eq.

D-meson decay constants and a check of factorization in non-leptonic B-decays · Verifying the factorization approximation · 0.83
These effects can be calculated using the ratio of wrong-sign (Cabibbo-suppressed) to right-sign (Cabibbo-favored) decay rates: [equation] where $R(B̅^0→D̅^0 π^0)$ has not been measured and thus is approximated with $R(B^0→D^+ π^-)=(2.92±0.38±0.31)×10^-4$ [ref] , while $R(D^0→K^+ π^-)=(3.79±0.18)×10^-3$ and $R(D^0→K^+ π^- π^0)=(2.12±0.07)×10^-3$ are taken from the PDG [ref] .

Measurement of the branching fraction and $CP$ asymmetry for $B\to\bar{D}^{0} \pi$ decays · Belle Detector · 1.00
Using finally also the experimental branching ratio $BR(B̅_d^0 →D^+ π^-) = (2.68±0.13)×10^-3$ [ref] , the relation in [ref] gives [equation] This value is consistent with the results for $x_d$ given in Ref. [ref] .

Exploring $B_s \to D_s^{(*)\pm} K^\mp$ Decays in the Presence of a Sizable Width Difference $\Delta\Gamma_s$ · Hadronic Parameters from $B_d →D_(s)^(*)± π^∓$ Data · 0.97

Compares with it 2 papers

[ref] the value of SU(3) breaking ratio $f_D_s/f_D=1.164(11)$ has been used, while our value is $f_D_s/f_D=1.18(1)(6)$.

D-meson decay constants and a check of factorization in non-leptonic B-decays · Verifying the factorization approximation · 0.90
The measured value of $()$ is in good agreement with existing measurements from the BaBar collaboration [ref] , and is larger than the result published by the Belle collaboration [ref] with a significance of more than three standard deviations.

Determination of the branching fractions of $B_{s}^{0} \to D_{s}^{\mp} K^{\pm}$ and $B^{0} \to D_{s}^{-} K^{+}$ · Determination of branching fractions · 1.00

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One can use the $→$ result to calculate the CKM matrix element $|V_ub|$ following the prescription laid out in Ref. [ref] .

Comments on $\left|\frac{V_{ub}}{V_{cb}}\right|$ and $|V_{ub}|$ from Non-leptonic $B$ Decays within the Perturbative QCD Approach · Introduction · 0.94

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