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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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The HEV Ventilator
/ Buytaert, J (European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland) ; Collins, P (European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland) ; Abed Abud, A (European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland) ; Allport, P (Particle Physics Group, School of Physics and Astronomy, University of Birmingham, B15 2TT, United Kingdom) ; Pazos Alvarez, A (Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, 15782 Galicia, Spain) ; Akiba, K (Nikhef National Institute for Subatomic Physics, Amsterdam, 1098 XG, Netherlands) ; Augusto de Aguiar Francisco, O (European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland) ; Bay, A (Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland) ; Bernard, F (Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland) ; Baron, S (European Organization for Nuclear Research (CERN), CH-1211 Genève 23, Switzerland) et al.
HEV is a low-cost, versatile, high-quality ventilator, which has been designed in response to the COVID-19 pandemic. The ventilator is intended to be used both in and out of hospital intensive care units, and for both invasive and non-invasive ventilation. [...]
EP-Tech-Note-2020-002.-
Geneva : CERN, 2020 - 8 p.
Fulltext: PDF;
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4.
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Velo Upgrade Module Nomenclature
/ Coco, Victor (European Organization for Nuclear Research (CERN), Geneva, Switzerland) ; Akiba, Kazu (Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands) ; Back, John (Department of Physics, University of Warwick, Coventry, United Kingdom) ; Bertella, Claudia (European Organization for Nuclear Research (CERN), Geneva, Switzerland) ; Bitadze, Alexander (School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom) ; Boente García, Oscar (Instituto Galego de Física de Altás (IGFAE), Universidade de Santiago de Compostela,Santiago de Compostela, Spain) ; Bogdanova, Galina (Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia) ; Borghi, Silvia (School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom) ; Bowcock, Themis (Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom) ; Bridges, Kieran (Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom) et al.
The nomenclature and geometry of the various constituents of velo upgrade hybrid sensors are defined, as well as their position within the modules. The modules nomenclature and their position along the z-axis are defined..
LHCb-PUB-2019-008; CERN-LHCb-PUB-2019-008.-
Geneva : CERN, 2019 - 14.
Fulltext: PDF;
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5.
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Monitoring radiation damage in the LHCb Tracker Turicensis
/ Abellan Beteta, C. (Zurich U.) ; Atzeni, M. (Zurich U.) ; Battista, V. (Ecole Polytechnique, Lausanne) ; Bursche, A. (INFN, Cagliari) ; Dey, B. (CCNU, Wuhan, Inst. Part. Phys.) ; Dosil Suarez, A. (Santiago de Compostela U., IGFAE) ; Elsasser, C. (Zurich U.) ; Fernandez Prieto, A. (Santiago de Compostela U., IGFAE) ; Fu, J. (Milan U.) ; Graverini, E. (Ecole Polytechnique, Lausanne) et al.
/LHCb Silicon Tracker Group
This paper presents the techniques used to monitor radiation damage in the LHCb Tracker Turicensis during the LHC Runs 1 and 2. Bulk leakage currents in the silicon sensors were monitored continuously, while the full depletion voltages of the sensors were estimated at regular intervals by performing dedicated scans of the charge collection efficiency as a function of the applied bias voltage. [...]
arXiv:1809.05063; CERN-LHCb-DP-2018-003.-
2020-08-25 - 15 p.
- Published in : JINST 15 (2020) P08016
Fulltext: PDF; Fulltext from publisher: PDF;
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Probing active-edge silicon sensors using a high precision telescope
/ Akiba, K (Rio de Janeiro Federal U.) ; Artuso, M (Syracuse U.) ; van Beveren, V (NIKHEF, Amsterdam) ; van Beuzekom, M (NIKHEF, Amsterdam) ; Boterenbrood, H (NIKHEF, Amsterdam) ; Buytaert, J (CERN) ; Collins, P (CERN) ; Dumps, R (CERN) ; van der Heijden, B (NIKHEF, Amsterdam) ; Hombach, C (Manchester U.) et al.
The performance of prototype active-edge VTT sensors bump-bonded to the Timepix ASIC is presented. Non-irradiated sensors of thicknesses 100–200 μm and pixel-to-edge distances of 50 μm and 100 μm were probed with a beam of charged hadrons with sub-pixel precision using the Timepix telescope assembled at the SPS at CERN. [...]
2015 - 8 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 777 (2015) 110-117
Elsevier Open Access article: PDF;
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Model-independent confirmation of the $Z(4430)^-$ state
/ LHCb collaboration
The decay $B^0\to \psi(2S) K^+\pi^-$ is analyzed using $\rm 3~fb^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\psi(2S) \pi$ mass spectrum is obtained, using as input the $K\pi$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. [...]
arXiv:1510.01951; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038; CERN-PH-EP-2015-244; LHCB-PAPER-2015-038.-
2015-12-29 - 15 p.
- Published in : Phys. Rev. D 92 (2015) 112009
APS Open Access article: PDF; Fulltext: 10.1103_PhysRevD.92.112009 - PDF; arXiv:1510.01951 - PDF; External link: Figures, tables and other information
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Characterisation of Medipix3 Silicon Detectors in a Charged-Particle Beam
/ Akiba, K. (Rio de Janeiro Federal U.) ; Alozy, J. (CERN) ; Aoude, R.Tourinho (Rio de Janeiro, Pont. U. Catol.) ; van Beuzekom, M. (NIKHEF, Amsterdam) ; Buytaert, J. (CERN) ; Collins, P. (CERN) ; Dosil Suárez, A. (Santiago de Compostela U.) ; Dumps, R. (CERN) ; Gallas, A. (Santiago de Compostela U.) ; Hombach, C. (Manchester U.) et al.
While designed primarily for X-ray imaging applications, the Medipix3 ASIC can also be used for charged-particle tracking. In this work, results from a beam test at the CERN SPS with irradiated and non-irradiated sensors are presented and shown to be in agreement with simulation, demonstrating the suitability of the Medipix3 ASIC as a tool for characterising pixel sensors..
arXiv:1509.02387; LHCB-PUB-2016-002; CERN-LHCb-PUB-2016-002; CERN-LHCb-PUB-2016-002.-
2016-01-21 - 13 p.
- Published in : JINST 11 (2016) P01011
Fulltext: LHCb-PUB-2016-002 - PDF; 10.1088_1748-0221_11_01_P01011 - PDF; arXiv:1509.02387 - PDF; IOP: PDF; External link: Preprint
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Search for the lepton flavour violating decay $\tau^-\to \mu^-\mu^+\mu^-$
/ LHCb Collaboration
A search for the lepton flavour violating decay $\tau^-\rightarrow\mu^-\mu^+\mu^-$ is performed with the LHCb experiment. The data sample corresponds to an integrated luminosity of 1.0 fb$^{−1}$ of proton-proton collisions at a centre-of-mass energy of 7 TeV and 2.0 fb$^{−1}$ at 8 TeV. [...]
arXiv:1409.8548; LHCB-PAPER-2014-052; CERN-PH-EP-2014-236; LHCB-PAPER-2014-052; CERN-PH-EP-2014-236.-
Geneva : CERN, 2015-02-18 - 19 p.
- Published in : JHEP 02 (2015) 121
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; Springer Open Access article: PDF;
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Measurement of the CP-violating phase $\phi_s$ in $\bar{B}^{0}_{s}\to D_{s}^{+}D_{s}^{-}$ decays
/ LHCb collaboration
We present a measurement of the $CP$-violating weak mixing phase $\phi_s$ using the decay $\bar{B}^{0}_{s}\to D_{s}^{+}D_{s}^{-}$ in a data sample corresponding to $3.0$ fb$^{-1}$ of integrated luminosity collected with the LHCb detector in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. An analysis of the time evolution of the system, which does not constrain $|\lambda|=1$ to allow for the presence of $CP$ violation in decay, yields $\phi_s = 0.02 \pm 0.17$ (stat) $\pm 0.02$ (syst) rad, $|\lambda| = 0.91^{+0.18}_{-0.15}$ (stat) $\pm0.02$ (syst). [...]
arXiv:1409.4619; LHCB-PAPER-2014-051; CERN-PH-EP-2014-223; LHCB-PAPER-2014-051; CERN-PH-EP-2014-223.-
Geneva : CERN, 2014-11-20 - 9 p.
- Published in : Phys. Rev. Lett. 113 (2014) 211801
APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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