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Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade

The first Dalitz plot analysis of $B^0 \to \eta_c(1S)K^+\pi^-$ decays using the data collected by the LHCb detector is presented. A satisfactory description of the data is obtained when including a contribution representing an exotic $\eta_c(1S) \pi^-$ resonant state. The significance of thi...

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Autor principal: Cavallero, Giovanni
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2647311
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author Cavallero, Giovanni
author_facet Cavallero, Giovanni
author_sort Cavallero, Giovanni
collection CERN
description The first Dalitz plot analysis of $B^0 \to \eta_c(1S)K^+\pi^-$ decays using the data collected by the LHCb detector is presented. A satisfactory description of the data is obtained when including a contribution representing an exotic $\eta_c(1S) \pi^-$ resonant state. The significance of this exotic resonance, named $Z_c(4100)^-$, is more than three standard deviations, while its mass and width are $4096 \pm 20 ^{+18}_{-22}$ MeV and $152 \pm 58 ^{+60}_{-35}$ MeV, respectively. The spin-parity assignments $J^P=0^+$ and $J^{P}=1^-$ are both consistent with the data. In addition, the first measurement of the $B^0 \to \eta_c(1S)K^+\pi^-$ branching fraction is performed and gives $\displaystyle \mathcal{B}(B^0 \to \eta_c(1S)K^+\pi^-) = (5.73 \pm 0.24 \pm 0.13 \pm 0.66) \times 10^{-4}$, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions. In order to increase the potential of discovery in indirect searches for New Physics in the heavy-flavour sector, the LHCb experiment will undergo a major upgrade in 2019-2020, allowing the detector to operate with a five-fold increase in the instantaneous luminosity. Innovative data acquisition and trigger systems will be implemented, and a brand-new LHCb detector will be installed. The RICH detectors, being of crucial importance in the analyses performed by the LHCb collaboration, will be redesigned, with new photon detectors and front-end electronics. The development, test and characterisation of the the prototypes for the opto-electronics chain of the RICH upgrade, are reported. The development of the prototype of the Experiment Control System and of the Inventory, Bookkeeping and Connectivity database for the RICH upgrade are presented.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-26473112019-09-30T06:29:59Zhttp://cds.cern.ch/record/2647311engCavallero, GiovanniEvidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgradeParticle Physics - ExperimentDetectors and Experimental TechniquesThe first Dalitz plot analysis of $B^0 \to \eta_c(1S)K^+\pi^-$ decays using the data collected by the LHCb detector is presented. A satisfactory description of the data is obtained when including a contribution representing an exotic $\eta_c(1S) \pi^-$ resonant state. The significance of this exotic resonance, named $Z_c(4100)^-$, is more than three standard deviations, while its mass and width are $4096 \pm 20 ^{+18}_{-22}$ MeV and $152 \pm 58 ^{+60}_{-35}$ MeV, respectively. The spin-parity assignments $J^P=0^+$ and $J^{P}=1^-$ are both consistent with the data. In addition, the first measurement of the $B^0 \to \eta_c(1S)K^+\pi^-$ branching fraction is performed and gives $\displaystyle \mathcal{B}(B^0 \to \eta_c(1S)K^+\pi^-) = (5.73 \pm 0.24 \pm 0.13 \pm 0.66) \times 10^{-4}$, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions. In order to increase the potential of discovery in indirect searches for New Physics in the heavy-flavour sector, the LHCb experiment will undergo a major upgrade in 2019-2020, allowing the detector to operate with a five-fold increase in the instantaneous luminosity. Innovative data acquisition and trigger systems will be implemented, and a brand-new LHCb detector will be installed. The RICH detectors, being of crucial importance in the analyses performed by the LHCb collaboration, will be redesigned, with new photon detectors and front-end electronics. The development, test and characterisation of the the prototypes for the opto-electronics chain of the RICH upgrade, are reported. The development of the prototype of the Experiment Control System and of the Inventory, Bookkeeping and Connectivity database for the RICH upgrade are presented.CERN-THESIS-2018-243oai:cds.cern.ch:26473112018-11-16T09:25:09Z
spellingShingle Particle Physics - Experiment
Detectors and Experimental Techniques
Cavallero, Giovanni
Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title_full Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title_fullStr Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title_full_unstemmed Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title_short Evidence for an $\eta_c(1S)\pi^-$ exotic resonance at LHCb and development of the Experiment Control System for the RICH upgrade
title_sort evidence for an $\eta_c(1s)\pi^-$ exotic resonance at lhcb and development of the experiment control system for the rich upgrade
topic Particle Physics - Experiment
Detectors and Experimental Techniques
url http://cds.cern.ch/record/2647311
work_keys_str_mv AT cavallerogiovanni evidenceforanetac1spiexoticresonanceatlhcbanddevelopmentoftheexperimentcontrolsystemfortherichupgrade