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Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment

First evidence of the $B^0\to J/\psi\omega$ decay is found and the $B^0_s\to J/\psi\eta$ and $B^0_s\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a center-...

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Autor principal: Savrina, Daria
Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1637043
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author Savrina, Daria
author_facet Savrina, Daria
author_sort Savrina, Daria
collection CERN
description First evidence of the $B^0\to J/\psi\omega$ decay is found and the $B^0_s\to J/\psi\eta$ and $B^0_s\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 7$ TeV. Branching fractions of these decays are measured relative to that of the $B^0\to J/\psi\rho^0$ decay. All the channels under study contain photons in the final state. Precise determination of photons energies is essential for accurate measurement of the decays branching fractions. So, an auxiliary task was a regular calibration of the LHCb electromagnetic calorimeter with neutral pions. Values obtained for the $B^0_s\to J/\psi\eta$ and $B^0_s\to J/\psi\eta^{\prime}$ decays branching fractions, as well as a ratio of these values, are found to be in a good agreement with both theoretical predictions and results of previous measurements. The $B^0\to J/\psi\omega$ decay is seen for the first time. The regular precise calibration of the electromagnetic calorimeter with neutral pions was allowing to keep the photon energies measurement accuracy at a level of 2 % during whole period of datataking in 2010-2012.
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spelling cern-16370432019-09-30T06:29:59Zhttp://cds.cern.ch/record/1637043engSavrina, DariaMeasurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experimentParticle Physics - ExperimentFirst evidence of the $B^0\to J/\psi\omega$ decay is found and the $B^0_s\to J/\psi\eta$ and $B^0_s\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 7$ TeV. Branching fractions of these decays are measured relative to that of the $B^0\to J/\psi\rho^0$ decay. All the channels under study contain photons in the final state. Precise determination of photons energies is essential for accurate measurement of the decays branching fractions. So, an auxiliary task was a regular calibration of the LHCb electromagnetic calorimeter with neutral pions. Values obtained for the $B^0_s\to J/\psi\eta$ and $B^0_s\to J/\psi\eta^{\prime}$ decays branching fractions, as well as a ratio of these values, are found to be in a good agreement with both theoretical predictions and results of previous measurements. The $B^0\to J/\psi\omega$ decay is seen for the first time. The regular precise calibration of the electromagnetic calorimeter with neutral pions was allowing to keep the photon energies measurement accuracy at a level of 2 % during whole period of datataking in 2010-2012.CERN-THESIS-2013-229oai:cds.cern.ch:16370432013-12-16T10:24:59Z
spellingShingle Particle Physics - Experiment
Savrina, Daria
Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title_full Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title_fullStr Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title_full_unstemmed Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title_short Measurement of the branching fractions of the $B^0_s\to J/\psi\eta$, $B^0_s\to J/\psi\eta^{\prime}$ and $B^0\to J\psi\omega$ decays in the LHCb experiment
title_sort measurement of the branching fractions of the $b^0_s\to j/\psi\eta$, $b^0_s\to j/\psi\eta^{\prime}$ and $b^0\to j\psi\omega$ decays in the lhcb experiment
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1637043
work_keys_str_mv AT savrinadaria measurementofthebranchingfractionsoftheb0stojpsietab0stojpsietaprimeandb0tojpsiomegadecaysinthelhcbexperiment