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Cowan, GA, Craik, DC, Crocombe, A, Torres, M Cruz, Cunliffe, S, Currie, R, D'Ambrosio, C, Marinho, F Da Cunha, Dall'Occo, E, Dalseno, J, David, PNY, Davis, A, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, Dean, CT, Decamp, D, Deckenhoff, M, Del Buono, L, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Dettori, F, Dey, B, Di Canto, A, Dijkstra, H, Dordei, F, Dorigo, M, Suarez, A Dosil, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Dungs, K, Durante, R, Dzhelyadin, R, Dziurda, A, Dzyuba, A, Deleage, N, Easo, S, Ebert, M, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, Ely, S, Esen, S, Evans, HM, Evans, T, Falabella, A, Farley, N, Farry, S ORCID: 0000-0001-5119-9740, Fay, R, Fazzini, D, Ferguson, D, Fernandez Prieto, A, Ferrari, F, Rodrigues, F Ferreira, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiore, M, Fiorini, M, Firlej, M, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fohl, K, Fontana, M, 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(2017)
Observation of the <i>Ξ<SUP>-</SUP><sub>b</sub> →J/ψΛK</i><SUP>-</SUP> decay.
PHYSICS LETTERS B, 772.
pp. 265-273.
Abstract
The observation of the decay $\varXi^{-}_{b}\to J/\psi\varLambda K^{-}$ is
reported, using a data sample corresponding to an integrated luminosity of
$3~\mathrm{fb}^{-1}$, collected by the LHCb detector in $pp$ collisions at
centre-of-mass energies of $7$ and $8~\mathrm{TeV}$. The production rate of
$\varXi_{b}^{-}$ baryons detected in the decay $\varXi_{b}^{-}\to
J/\psi\varLambda K^{-}$ is measured relative to that of $\varLambda_{b}^{0}$
baryons using the decay $\varLambda_{b}^{0}\to J/\psi \varLambda$. Integrated
over the $b$-baryon transverse momentum $p_{\rm T}<25~\mathrm{GeV/}c $ and
rapidity $2.0<y<4.5$, the measured ratio is \begin{equation*}
\frac{f_{\varXi_{b}^{-}}}{f_{\varLambda_{b}^{0}}}\frac{\mathcal{B}(\varXi_{b}^{-}\to
J/\psi\varLambda K^{-})}{\mathcal{B}(\varLambda_{b}^{0}\to J/\psi
\varLambda)}=(4.19\pm 0.29~(\mathrm{stat})\pm0.15~(\mathrm{syst}))\times
10^{-2}, \end{equation*}where $f_{\varXi_{b}^{-}}$ and $f_{\varLambda_{b}^{0}}$
are the fragmentation fractions of $b\to\varXi_{b}^{-}$ and
$b\to\varLambda_{b}^{0}$ transitions, and $\mathcal{B}$ represents the
branching fraction of the corresponding $b$-baryon decay. The mass difference
between $\varXi_{b}^{-}$ and $\varLambda_{b}^{0}$ baryons is measured to be
\begin{equation*}
M(\varXi_{b}^{-})-M(\varLambda_{b}^{0})=177.08\pm0.47~(\mathrm{stat})\pm0.16~(\mathrm{syst}
)~\mathrm{MeV/}c^{2}. \end{equation*}
Item Type: |
Article
|
Additional Information: |
All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-053.html |
Uncontrolled Keywords: |
hep-ex, hep-ex |
Depositing User: |
Symplectic Admin
|
Date Deposited: |
12 Jan 2018 12:52 |
Last Modified: |
10 Oct 2023 23:23 |
DOI: |
10.1016/j.physletb.2017.06.045 |
Related URLs: |
|
URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3015931 |