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1.
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Microchannel Cooling for the LHCb VELO Upgrade I
/ Collins, Paula (CERN) ; De Aguiar Francisco, Oscar Augusto (University of Manchester (GB)) ; Byczynski, Wiktor (Tadeusz Kosciuszko Cracow University of technology (PL)) ; Akiba, Kazu (Nikhef National institute for subatomic physics (NL)) ; Bertella, Claudia (University of Manchester (GB)) ; Bitadze, Alexander (University of Manchester (GB)) ; Buytaert, Jan (CERN) ; De Capua, Stefano (University of Manchester (GB)) ; Callegari, Riccardo (CERN) ; Catinaccio, Andrea (CERN) et al.
The LHCb VELO Upgrade I, currently being installed for the 2022 start of LHC Run 3, uses silicon microchannel coolers with internally circulating bi-phase \cotwo for thermal control of hybrid pixel modules operating in vacuum. This is the largest scale application of this technology to date. [...]
arXiv:2112.12763; CERN-LHCb-PUB-2021-010; LHCb-PUB-2021-010; CERN-LHCb-PUB-2021-010.-
Geneva : CERN, 2022-09-11 - 18 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1039 (2022) 166874
Fulltext: 2112.12763 - PDF; Publication - PDF; Publication: PDF;
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2.
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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
Fulltext: PDF;
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3.
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The upgrade I of LHCb VELO—towards an intelligent monitoring platform
/ Kopciewicz, P. (AGH-UST, Cracow) ; Szumlak, T. (AGH-UST, Cracow) ; Majewski, M. (AGH-UST, Cracow) ; Akiba, K. (Nikhef, Amsterdam) ; Augusto, O. (CERN) ; Back, J. (Warwick U.) ; Bobulska, D.S. (Glasgow U.) ; Bogdanova, G. (SINP, Moscow) ; Borghi, S. (Manchester U.) ; Bowcock, T. (Liverpool U.) et al.
The Large Hadron Collider beauty (LHCb) detector is designed to detect decays of b- and c- hadrons for the study of CP violation and rare decays. At the end of the LHC Run 2, many of the LHCb measurements remained statistically dominated. [...]
arXiv:2006.09559.-
2020-06-04 - 11 p.
- Published in : JINST
Fulltext: PDF;
In : 15th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD 2019), Siena, Italy, 14 - 17 Oct 2019, pp.C06009
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4.
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Search for $CP$ violation in $\Xi_c^+\rightarrow pK^-\pi^+$ decays using model-independent techniques
/ LHCb Collaboration
A first search for $CP$ violation in the Cabibbo-suppressed $\Xi_c^+\rightarrow pK^-\pi^+$ decay is performed using both a binned and an unbinned model-independent technique in the Dalitz plot. The studies are based on a sample of proton-proton collision data, corresponding to an integrated luminosity of $3.0~\rm fb^{-1}$, and collected by the LHCb experiment at centre-of-mass energies of $7$ and $8~\rm TeV$. [...]
arXiv:2006.03145; CERN-EP-2020-069; LHCb-PAPER-2019-026; LHCB-PAPER-2019-026.-
Geneva : CERN, 2020-10-26 - 16 p.
- Published in : Eur. Phys. J. C 80 (2020) 986
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
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5.
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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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6.
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Measurement of the branching fraction of the decay $B_s^0\to K_S^0 K_S^0$
/ LHCb Collaboration
A measurement of the branching fraction of the decay $B_s^0 \to K_S^0 K_S^0$ is performed using proton-proton collision data corresponding to an integrated luminosity of 5 fb$^{-1}$ collected by the LHCb experiment between 2011 and 2016. The branching fraction is determined to be$$ \mathcal{B}(B_s^0 \to K_S^0 K_S^0) = [8.3 \pm 1.6 (\rm{stat}) \pm 0.9 (\rm{syst}) \pm 0.8 (\rm{norm}) \pm 0.3 (f_s/f_d)] \times 10^{-6}, $$ where the first uncertainty is statistical, the second is systematic, and the third and fourth are due to uncertainties on the $B^0 \to \phi K_S^0$ branching fraction and the ratio of hadronization fractions $f_s/f_d$ [...]
arXiv:2002.08229; LHCb-PAPER-2019-030; CERN-EP-2020-008; LHCB-PAPER-2019-030.-
Geneva : CERN, 2020-08-01 - 15 p.
- Published in : Phys. Rev. D 102 (2020) 012011
Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;
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7.
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8.
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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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9.
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Observation of the semileptonic decay $B^{+}\to p\overline{p}\mu^{+}\nu_{\mu}$
/ LHCb Collaboration
The Cabibbo-suppressed semileptonic decay $B^{+}\to p\overline{p}\mu^{+}\nu_{\mu}$ is observed for the first time using a sample of $pp$ collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.7fb$^{-1}$ at centre-of-mass energies of 7, 8 and 13TeV, respectively. The differential branching fraction is measured as a function of the $p\overline{p}$ invariant mass using the decay mode $B^{+}\to J/\psi K^{+}$ for normalisation. [...]
arXiv:1911.08187; LHCb-PAPER-2019-034; CERN-EP-2019-236; LHCB-PAPER-2019-034.-
Geneva : CERN, 2020-03-25 - 23 p.
- Published in : JHEP 2003 (2020) 146
Article from SCOAP3: PDFPDFA; Fulltext: LHCb-PAPER-2019-034 - PDF; 1911.08187 - PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Article from SCOAP3
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10.
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