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Considerations for the VELO detector at the LHCb Upgrade II
/ Akiba, Kazu (Nikhef National institute for subatomic physics (NL)) ; Alexander, Michael Thomas (University of Glasgow (GB)) ; Back, John James (University of Warwick (GB)) ; Bates, Richard (University of Glasgow (GB)) ; Bertella, Claudia (University of Manchester (GB)) ; Van Beuzekom, Martin (Nikhef National institute for subatomic physics (NL)) ; Seman Bobulska, Dana (University of Glasgow (GB)) ; Boente Garcia, Oscar (Universidade de Santiago de Compostela (ES)) ; Bogdanova, Galina (M.V. Lomonosov Moscow State University (RU)) ; Borghi, Silvia (University of Manchester (GB)) et al.
The LHCb experiment is planning to operate with a 7.5-fold increase in instantaneous luminosity for LHC Runs 5 and 6. The performance of the Vertex Locator detector is crucial in the event reconstruction at the increased pile-up, providing real-time information to be used in the trigger. [...]
LHCb-PUB-2022-001; CERN-LHCb-PUB-2022-001.-
Geneva : CERN, 2022 - 98.
Fulltext: PDF;
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Readout Firmware of the Vertex Locator for LHCb Run 3 and Beyond
/ Hennessy, Karol (U. Liverpool (main)) ; Prieto, Antonio Fernandez (Santiago de Compostela U., IGFAE) ; Regueiro, Pablo Vazquez (Santiago de Compostela U., IGFAE) ; Buytaert, Jan (CERN) ; Van Beuzekom, Martin (Nikhef, Amsterdam) ; Cid, Edgar Lemos (Santiago de Compostela U., IGFAE) ; Eklund, Lars (Glasgow U.) ; de Bruyn, Kristof (Nikhef, Amsterdam) ; Naik, Sneha (Glasgow U.) ; Schiller, Manuel (Glasgow U.) et al.
The new LHCb Vertex Locator (VELO) for LHCb, comprising a new pixel detector and readout electronics, will be installed in 2021 for data taking in Run 3 at the LHC. The electronics centers around the “VeloPix” ASIC at the front-end operating in a trigger-less readout at 40MHz. [...]
2021 - 8 p.
- Published in : IEEE Trans. Nucl. Sci. 68 (2021) 2472-2479
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The very forward CASTOR calorimeter of the CMS experiment
/ CMS Collaboration
The physics motivation, detector design, triggers, calibration, alignment, simulation, and overall performance of the very forward CASTOR calorimeter of the CMS experiment are reviewed. The CASTOR Cherenkov sampling calorimeter is located very close to the LHC beam line, at a radial distance of about 1 cm from the beam pipe, and at 14.4 m from the CMS interaction point, covering the pseudorapidity range of $-6.6 < \eta < -5.2$. [...]
arXiv:2011.01185; CMS-PRF-18-002; CERN-EP-2020-180; CMS-PRF-18-002; CERN-EP-2020-180; CMS-PRF-18-002-003.-
Geneva : CERN, 2021-02-08 - 65 p.
- Published in : JINST 16 (2021) P02010
Fulltext: 2011.01185 - PDF; fermilab-pub-20-696-cms-scd - PDF; CMS-PRF-18-002-arxiv - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment
/ Prieto, Antonio Fernández (Santiago de Compostela U., IGFAE) ; Vázquez Regueiro, Pablo (Santiago de Compostela U., IGFAE) ; Hennessy, Karol (Liverpool U.) ; Buytaert, Jan (CERN) ; van Beuzekom, Martin (Nikhef, Amsterdam) ; Lemos Cid, Edgar (Santiago de Compostela U., IGFAE) ; Eklund, Lars (Glasgow U.) ; de Bruyn, Kristof (CERN) ; Naik, Sneha (Glasgow U.) ; Schiller, Manuel (Glasgow U.) et al.
This article describes the high-speed system designed to meet the challenging requirements for the readout of the new pixel VErtex LOcator (VELO) of the upgraded LHCb experiment. All elements of the electronics readout chain will be renewed to cope with the requirement of ~40-MHz full-event readout rate. [...]
2020 - 8 p.
- Published in : IEEE Trans. Nucl. Sci. 67 (2020) 732-739
Fulltext from publisher: PDF;
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First observation of excited $\Omega_b^-$ states
/ LHCb Collaboration
We report four narrow peaks in the $\Xi_b^0K^-$ mass spectrum obtained using $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 9 fb$^{-1}$ recorded by the LHCb experiment. Referring to these states by their mass, the mass values are \begin{align*} m(\Omega_b(6316)^-) &= 6315.64\pm0.31\pm0.07\pm0.50 {\rm MeV}, \\ m(\Omega_b(6330)^-) &= 6330.30\pm0.28\pm0.07\pm0.50 {\rm MeV}, \\ m(\Omega_b(6340)^-) &= 6339.71\pm0.26\pm0.05\pm0.50 {\rm MeV}, \\ m(\Omega_b(6350)^-) &= 6349.88\pm0.35\pm0.05\pm0.50 {\rm MeV}, \end{align*}where the uncertainties are statistical, systematic and the last is due to the knowledge of the $\Xi_b^0$ mass. [...]
arXiv:2001.00851; LHCb-PAPER-2019-042; CERN-EP-2019-278; LHCB-PAPER-2019-042.-
Geneva : CERN, 2020-02-26 - 12 p.
- Published in : Phys. Rev. Lett. 124 (2020) 082002
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;
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Measurement of $CP$ violation in $B^0\to D^{*\pm} D^{\mp}$ decays
/ LHCb Collaboration
The decay-time-dependent $CP$ asymmetry in $B^0 \to D^{*\pm}D^{\mp}$ decays is measured using a data set corresponding to an integrated luminosity of$9$fb$^{-1}$ recorded by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The $CP$ parameters are measured as $ S_{D^*D} = -0.861 \pm 0.077\,\text{(stat)} \pm 0.019 \,\text{(syst)}\,, $ $ \Delta S_{D^*D} = 0.019 \pm 0.075 \,\text{(stat)} \pm 0.012 \,\text{(syst)}\,, $ $ C_{D^*D} = -0.059 \pm 0.092 \,\text{(stat)} \pm 0.020 \,\text{(syst)} \,, $ $ \Delta C_{D^*D} = -0.031 \pm 0.092 \,\text{(stat)} \pm 0.016\,\text{(syst)} \,, $ $ {\cal A}_{D^*D} = 0.008 \pm 0.014 \,\text{(stat)} \pm 0.006\,\text{(syst)}\,. [...]
arXiv:1912.03723; LHCb-PAPER-2019-036; CERN-EP-2019-264; LHCB-PAPER-2019-036.-
2020-03-25 - 28 p.
- Published in : JHEP 2003 (2020) 147
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Fulltext from publisher
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Isospin amplitudes in $\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)$ and $\Xi_b^0\to J/\psi \Xi^0(\Lambda)$ decays
/ LHCb Collaboration
Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions, and allow searches for physics beyond the Standard Model. We present the first results on isospin amplitudes in $b$-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb$^{-1}$, collected with the LHCb detector in $pp$ collisions at center of mass energies of 7, 8 and 13 TeV. [...]
arXiv:1912.02110; CERN-EP-2019-268; LHCb-PAPER-2019-039; LHCB-PAPER-2019-039-003; LHCB-PAPER-2019-039.-
Geneva : CERN, 2020-03-17 - 11 p.
- Published in : Phys. Rev. Lett. 124 (2020) 111802
Article from SCOAP3: PDF; Fulltext: 1912.02110 - PDF; DI-PRL-cascade - PDF; Fulltext from Publisher: PDF; Related data file(s): ZIP;
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Precision measurement of the $\Xi_{cc}^{++}$ mass
/ LHCb Collaboration
A measurement of the $\Xi_{cc}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in $pp$ collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 $\mathrm{fb}^{-1}$. The $\Xi_{cc}^{++}$ candidates are reconstructed via the decay modes $\Xi_{cc}^{++}\to\Lambda_c^+K^-\pi^+\pi^+$ and $\Xi_{cc}^{++}\to\Xi_c^+\pi^+$. [...]
arXiv:1911.08594; LHCb-PAPER-2019-037; CERN-EP-2019-258; LHCB-PAPER-2019-037.-
2020-02-07 - 18 p.
- Published in : JHEP 2002 (2020) 049
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary Information: ZIP;
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