Accès ouvert
2020
article
OpenAlex
A. Abdesselam, I. Adachi, V. Aulchenko, D. Greenwald et autres
We present measurements of the branching fractions for the decays $B\to K \mu^{+}\mu^{-}$ and $B\to K e^{+}e^{-}$, and their ratio ($R_{K}$), using a data sample of 711 $fb^{-1}$ that contains $772 \times 10^{6}$ $B\bar{B}$ events. The data were collected at the $\Upsilon(4S)$ …
kr, ru, jp, us, de, cn, in, fr, cz
(code pays fourni par la source)
2019
preprint
OpenAlex
A. Abdesselam, I. Adachi, K. Adamczyk, J.K. Ahn et autres
International audience
Accès ouvert
2019
preprint
OpenAlex
A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara et autres
We report a measurement of the ratios of branching fractions $\mathcal{R}(D) = {\cal B}(\bar{B} \to D τ^- \barν_τ)/{\cal B}(\bar{B} \to D \ell^- \barν_{\ell})$ and $\mathcal{R}(D^{\ast}) = {\cal B}(\bar{B} \to D^* τ^- \barν_τ)/{\cal B}(\bar{B} \to D^* \ell^- \barν_{\ell})$, where $\ell$ denotes an electron …
Accès ouvert
2019
article
OpenAlex
P. Oskin, S. Pardi, M. Ritter, A. Rostomyan et autres
We report the first observation of the radiative decay of the $\Upsilon(1S)$ into a charmonium state. The statistical significance of the observed signal of $\Upsilon(1S) \to \gamma \chi_{c1}$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($\Upsilon(1S) …