H. Ahmed

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Sw. Banerjee

University of Wisconsin System

M. Hernández Villanueva

Brookhaven National Laboratory

G. Batignani

Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

A. Gabrielli

Istituto Nazionale di Fisica Nucleare, Sezione di Trieste

E. Bertholet

Tel Aviv University

C. Cecchi

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia

F. U. Bernlochner

University of Bonn

J. M. Roney

University of Victoria

V. Gaur

Petronas (Malaysia)

G. De Pietro

Karlsruhe Institute of Technology

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Campbell Collaboration

139

Centre National de la Recherche Scientifique

University of the Basque Country

Institute of High Energy Physics

Budker Institute of Nuclear Physics

Laboratoire d’Annecy de Physique des Particules

European Organization for Nuclear Research

A. Alikhanyan National Laboratory

University of Bonn

Institut National de Physique Nucléaire et de Physique des Particules

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Measurement of the $B$$^{-}$ $\rightarrow$ $D$$^{0}$$\ell$$^{-}$$\bar{\nu}$$_{\ell}$ Branching Fraction in 62.8 fb$^{-1}$ of Belle II data

HAL (Le Centre pour la Communication Scientifique Directe) (2022)

F. Abudinén I. Adachi R. Adak K. Adamczyk L. Aggarwal

Bar (unit)

Branching (polymer chemistry)

Branching fraction

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Measurement of the branching fraction for the decay $B \to K^{\ast}(892)\ell^+\ell^-$ at Belle II

arXiv (Cornell University) (2022)

Belle II Collaboration F. Abudinén I. Adachi R. Adak K. Adamczyk

We report a measurement of the branching fraction of $B \to K^{\ast}(892)\ell^+\ell^-$ decays, where $\ell^+\ell^- = \mu^+\mu^-$ or $e^+e^-$, using electron-positron collisions recorded at an energy at or near the $\Upsilon(4S)$ mass and corresponding to an integrated luminosity of $189$ fb$^{-1}$. The data was collected during 2019--2021 by the Belle II experiment at the SuperKEKB $e^{+}e^{-}$ asymmetric-energy collider. We reconstruct $K^{\ast}(892)$ candidates in the $K^+\pi^-$, $K_{S}^{0}\pi^+$, and $K^+\pi^0$ final states. The signal yields with statistical uncertainties are $22\pm 6$, $18 \pm 6$, and $38 \pm 9$ for the decays $B \to K^{\ast}(892)\mu^+\mu^-$, $B \to K^{\ast}(892)e^+e^-$, and $B \to K^{\ast}(892)\ell^+\ell^-$, respectively. We measure the branching fractions of these decays for the entire range of the dilepton mass, excluding the very low mass region to suppress the $B \to K^{\ast}(892)\gamma(\to e^+e^-)$ background and regions compatible with decays of charmonium resonances, to be \begin{equation} {\cal B}(B \to K^{\ast}(892)\mu^+\mu^-) = (1.19 \pm 0.31 ^{+0.08}_{-0.07}) \times 10^{-6}, {\cal B}(B \to K^{\ast}(892)e^+e^-) = (1.42 \pm 0.48 \pm 0.09)\times 10^{-6}, {\cal B}(B \to K^{\ast}(892)\ell^+\ell^-) = (1.25 \pm 0.30 ^{+0.08}_{-0.07}) \times 10^{-6}, \end{equation} where the first and second uncertainties are statistical and systematic, respectively. These results, limited by sample size, are the first measurements of $B \to K^{\ast}(892)\ell^+\ell^-$ branching fractions from the Belle II experiment.

Branching fraction

Electron–positron annihilation

Branching (polymer chemistry)

10.48550/arxiv.2206.05946

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B[superscript 0] meson decays to ρ[superscript 0]K[superscript *0], f[subscript 0]K[superscript *0], and ρ[superscript -]K[superscript *+], including higher K[superscript *] resonances

APS (2012)

J. P. Lees V. Poireau V. Tisserand J. Garra Tico E. Grauges

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Evidence of the P_ccbars(4459)0 in Upsilon(1S, 2S) inclusive decays at Belle

arXiv (Cornell University) (2025)

I. Adachi L. Aggarwal H. Ahmed J. K. Ahn H. Aihara

Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy e+e- collider, we search for [udsccbar] pentaquark states decaying to Jpsi Lambda. Using the first observations of Upsilon(1S, 2S) inclusive decays to Jpsi Lambda, we find evidence of the P_ccbars(4459)0 state with a significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the Pccbars(4459)0 to be (4471.7 +- 4.8 +- 0.6) MeV/c2 and (21.9 +- 13.1 +- 2.7) MeV, respectively. The branching fractions for P_ccbars(4459)0 production are measured to be B[Upsilon(1S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 + anything] = (3.5 +- 2.0 +- 0.2)*10-6 and B[Upsilin(2S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 +anything] = (2.9 +- 1.7 +- 0.4)*10-6. The inclusive branching fractions of Upsilon(1S, 2S) -> Jpsi Lambda/Lambdabar are measured to be B[Upsilin(1S) -> Jpsi Lambda/Lambdabar + anything] = (36.9 +- 5.3 +- 2.4)*10-6 and B[Upsilon(2S) -> Jpsi Lambda/Lambdabar + anything] = (22.3 +- 5.7 +- 3.1)*10-6. We measure the visible cross section sigma(e+e- -> Jpsi Lambda/Lambdabar + anything) = (90 +- 14 +- 6) fb for the continuum production at sqrt(s) = 10.52 GeV. In all cases, the first uncertainties are statistical and the second are systematic.

10.48550/arxiv.2502.09951

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