CERN Accelerating science

LHCb Detector Performance Papers

新增:
2019-01-01
04:25
Design and performance of the LHCb trigger and full real-time reconstruction in Run 2 of the LHC / Aaij, R. (NIKHEF, Amsterdam) ; Albrecht, J. (Dortmund U.) ; Alexander, M. (Glasgow U.) ; Alfonso Albero, A. (ICC, Barcelona U.) ; Amerio, S. (INFN, Padua) ; Anderlini, L. (INFN, Florence) ; d'Argent, P. (Heidelberg U.) ; Baranov, A. (Yandex Sch. Data Anal., Moscow) ; Benson, S. (NIKHEF, Amsterdam) ; Bobulska, D. (Glasgow U.) et al.
The LHCb collaboration has redesigned its trigger to enable the full offline detector reconstruction to be performed in real time. Together with the real-time alignment and calibration of the detector, and a software infrastructure for persisting the high-level physics objects produced during real-time processing, this redesign enabled the widespread deployment of real-time analysis during Run 2. [...]
arXiv:1812.10790; CERN-LHCb-DP-2019-001.- 2019-04-24 - 46 p. - Published in : JINST 14 (2019) P04013 External links: 00034 The PV $x$ (left) and $z$ (right) resolution as a function of the number of tracks in the PV for the Run~1 offline and Run~2 (used both offline and online) PV reconstruction algorithms.; 00032 The PV $x$ (left) and $z$ (right) resolution as a function of the number of tracks in the PV for the Run~1 offline and Run~2 (used both offline and online) PV reconstruction algorithms.; 00038 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00033 Comparison of the track reconstruction efficiency in 2015 and 2012 data as a function of the momentum (left) and pseudorapidity (right).; 00010 The efficiency of the \hltone muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive single-track \hltone trigger is plotted for reference.; 00067 Two-dimensional efficiencies of the \lz trigger lines in Run~2 data: (top left) \lz hadron; (top right) \lz electron; (bottom left) \lz muon; and (bottom right) \lz dimuon. The \lz hadron efficiency is evaluated using $\Dz\to\Km\pip$ decays, whereas the others are evaluated using the relevant signals listed in Fig.~\ref{fig:L0performance_charm} and Fig.~\ref{fig:L0performance_beauty}.; Fulltext; 00020 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00065 The efficiency of the \hltone muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive single-track \hltone trigger is plotted for reference.; 00062 Efficiencies of the \lz trigger lines in Run~2 data for \Pb-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The plotted \lz efficiency for each \Pb-hadron is described in the legend above the plots.; 00057 The \spd hit multiplicity of events containing $\Bu\to\Dzb\pip$ candidates in Run~2 data.; 00064 Comparison of the track reconstruction efficiency in 2015 and 2012 data as a function of the momentum (left) and pseudorapidity (right).; 00049 Efficiencies of the \lz trigger lines in Run~2 data for \Pc-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The \lz hadron efficiency is shown.; 00061 Efficiency and fake rate of the \rich identification for the 2012 (left) and the 2016 (right) data.; 00007 The \hltone efficiency as a function of the different trigger configurations used during data taking for (left) \Pc-hadrons and (right) \Pb-hadrons. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017).; 00023 Efficiencies of the \lz trigger lines in Run~2 data for \Pc-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The \lz hadron efficiency is shown.\small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00045 Decay-time resolution for \decay{\Bs}{\jpsi\phi} decays as a function of momentum. The filled histogram shows the distribution of$\Bs$ meson momenta, to give an idea of the relative importance of the different resolution bins for the analysis sensitivity.; 00046 Comparison of the invariant mass distributions for a subset of the 2012 (left) and 2016 (right) data set, using \decay{\jpsi}{\mumu} decays, with the \jpsi originating from a \bquark hadron.; 00022 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the combined efficiency of the topological trigger lines for each \Pb-hadron decay mode.; 00014 Sketch of the different types of tracks within \lhcb.; 00017 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00035 Rates of the main groups of \hltone trigger lines and the total \hltone rate as a function of the year of data taking, shown for the trigger configuration used to take most of the luminosity in each year.; 00068 The $D^0$ (left) and $J/\psi$ (right) candidates selected by the \hltone calibration lines. Both plots show candidates reconstructed online.; 00037 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the combined efficiency of the topological trigger lines for each \Pb-hadron decay mode.; 00002 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00009 Two-dimensional efficiencies of the \lz trigger lines in Run~2 data: (top left) \lz hadron; (top right) \lz electron; (bottom left) \lz muon; and (bottom right) \lz dimuon. The \lz hadron efficiency is evaluated using $\Dz\to\Km\pip$ decays, whereas the others are evaluated using the relevant signals listed in Fig.~\ref{fig:L0performance_charm} and Fig.~\ref{fig:L0performance_beauty}.; 00041 Efficiency and fake rate of the \rich identification for the 2012 (left) and the 2016 (right) data.; 00016 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00025 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the different contributions of the 2-, 3-, and 4-body topological trigger lines to a specific decay.; 00030 Performance of the fake-track classifier on (left) \decay{D}{\Km\pip} and (right) \decay{\KS}{\pim\pip} decays.; 00060 Evolution of the \hlttwo efficiency as a function of the different trigger configurations used during data taking.; 00048 The efficiency of the \hltone muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive single-track \hltone trigger is plotted for reference.; 00004 \hltone muon identification efficiency for (left) muons from \decay{\jpsi}{\mumu} decays and (right) pions from \decay{D^0}{\Km\pip} decays. Red circles show only the identification efficiency while green squares show the efficiency of the additional trigger line requirements (see text).; 00001 Disk buffer usage projections during (left) and at the end of (right) the 2017 data-taking period. During data taking, simulations (red, left) are used to determine the probability of exceeding the 80\% usage threshold. In 2017, the loose \hltone configuration was used for the entire year leading to a maximum buffer capacity of 48\% (black, right). LHC Technical Stops and Machine Development periods are shown in dark and light grey, respectively. The schedule changed between when this simulation was run in week 28 and the end of the year. A machine development period was removed and the duration of the data taking was reduced.; 00005 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00052 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the different contributions of the 2-, 3-, and 4-body topological trigger lines to a specific decay.; 00027 Efficiencies of the \lz trigger lines in Run~2 data for \Pb-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The plotted \lz efficiency for each \Pb-hadron is described in the legend above the plots.; 00029 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the combined efficiency of the topological trigger lines for each \Pb-hadron decay mode.; 00019 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00021 Schematic view of the real-time alignment and calibration procedure starting at the beginning of each fill, as used for 2018 data taking.; 00018 Efficiencies of the \lz trigger lines in Run~2 data for \Pc-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The \lz hadron efficiency is shown.; 00053 \hltone muon identification efficiency for (left) muons from \decay{\jpsi}{\mumu} decays and (right) pions from \decay{D^0}{\Km\pip} decays. Red circles show only the identification efficiency while green squares show the efficiency of the additional trigger line requirements (see text).; 00026 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00054 Invariant mass of $B^0 \to (K^+ \pi^-) \gamma$ candidates in Run 1 (left) and Run 2 (right). The fit model includes the (red) signal component, (dashed green) combinatorial background, (dot-dashed turqoise) misidentified physics backgrounds (e.g. \decay{\Bs}{\phi\gamma} where a kaon is misidentified as a pion) and (dotted magenta) partially reconstructed physics backgrounds.; 00056 Invariant mass of $B^0 \to (K^+ \pi^-) \gamma$ candidates in Run 1 (left) and Run 2 (right). The fit model includes the (red) signal component, (dashed green) combinatorial background, (dot-dashed turqoise) misidentified physics backgrounds (e.g. \decay{\Bs}{\phi\gamma} where a kaon is misidentified as a pion) and (dotted magenta) partially reconstructed physics backgrounds.; 00028 Disk buffer usage projections during (left) and at the end of (right) the 2017 data-taking period. During data taking, simulations (red, left) are used to determine the probability of exceeding the 80\% usage threshold. In 2017, the loose \hltone configuration was used for the entire year leading to a maximum buffer capacity of 48\% (black, right). LHC Technical Stops and Machine Development periods are shown in dark and light grey, respectively. The schedule changed between when this simulation was run in week 28 and the end of the year. A machine development period was removed and the duration of the data taking was reduced.; 00039 The TOS efficiency of the \hlttwo muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive topological (``any topological'') trigger lines and topological trigger lines requiring one track identified as a muon (``any muon topological'') are plotted for reference.; 00044 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00066 Efficiency of the \hlttwo topological trigger lines as a function of the (left) \Pb-hadron \pt and (right) in units of the average \Pb-hadron decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots show the different contributions of the 2-, 3-, and 4-body topological trigger lines to a specific decay.; 00051 Performance of the fake-track classifier on (left) \decay{D}{\Km\pip} and (right) \decay{\KS}{\pim\pip} decays.; 00008 The TOS efficiency of the \hlttwo muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive topological (``any topological'') trigger lines and topological trigger lines requiring one track identified as a muon (``any muon topological'') are plotted for reference.; 00055 Efficiencies per signal mode for (top) 2016 and (bottom) 2017 data-taking periods measured in simulation. Red (left-slanted) hatched plots are when the entire \lz bandwith is granted to this signal mode, whereas blue (right-slanted) hatched plots are following the bandwidth division. Signals which appear only in blue are used for performance validation and are not part of the optimization itself. Channels followed by ``(S)'' are selected in a kinematic and geometric volume which is particularly important for spectroscopy studies.; 00063 Resolution of the $x$ (left) and $y$ (right) components of the impact parameter comparing the 2012 (blue), 2015 (orange), 2016 (red) and 2017 (green) data-taking periods. The resolution as a function of \pt is given in the bottom right corner.; 00003 Two-dimensional efficiencies of the \lz trigger lines in Run~2 data: (top left) \lz hadron; (top right) \lz electron; (bottom left) \lz muon; and (bottom right) \lz dimuon. The \lz hadron efficiency is evaluated using $\Dz\to\Km\pip$ decays, whereas the others are evaluated using the relevant signals listed in Fig.~\ref{fig:L0performance_charm} and Fig.~\ref{fig:L0performance_beauty}.; 00050 Comparison of the invariant mass distributions for a subset of the 2012 (left) and 2016 (right) data set, using \decay{\jpsi}{\mumu} decays, with the \jpsi originating from a \bquark hadron.; 00006 Rates of the main categories of \hlttwo trigger lines and the total \hlttwo rate as a function of the year of data taking, shown for the trigger configuration used to take most of the luminosity in the given year. TURBO, TURCAL, and FULL refer to different output data streams as discussed in Ref.~\cite{LHCb-DP-2016-001}.; 00058 Two-dimensional efficiencies of the \lz trigger lines in Run~2 data: (top left) \lz hadron; (top right) \lz electron; (bottom left) \lz muon; and (bottom right) \lz dimuon. The \lz hadron efficiency is evaluated using $\Dz\to\Km\pip$ decays, whereas the others are evaluated using the relevant signals listed in Fig.~\ref{fig:L0performance_charm} and Fig.~\ref{fig:L0performance_beauty}.; 00036 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00015 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00031 The \hltone efficiency as a function of the different trigger configurations used during data taking for (left) \Pc-hadrons and (right) \Pb-hadrons. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017).; 00043 Efficiencies of the \lz trigger lines in Run~2 data for \Pb-hadron decays. The left plot shows the efficiency as a function of the hadron \pt, while the right plot shows the evolution of the efficiency as a function of the different trigger configurations used during data taking. The three blocks visible in the plot, separated by vertical gaps, correspond to the three years of data taking (2015--2017). The plotted \lz efficiency for each \Pb-hadron is described in the legend above the plots.; 00040 The TOS efficiency of the \hlttwo muon trigger lines as a function of the (left) \Pb-hadron \pt and (right) units of the average $\Bp$ decay time. The decay time plot is drawn such that the x-axis is binned in units of the average $\Bp$ lifetime. The efficiency of the inclusive topological (``any topological'') trigger lines and topological trigger lines requiring one track identified as a muon (``any muon topological'') are plotted for reference.; 00047 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pb-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00059 \small{Efficiency of the \hltone inclusive trigger lines as a function of (left) \Pc-hadron \pt and (right) decay time. The decay time plots are drawn such that the x-axis is binned in units of the average lifetime for each hadron. The plots in each column show, from top to bottom, the single-track, two-track, and combined \hltone inclusive performance.}; 00042 \hlttwo trigger efficiencies of the dedicated selections for low-multiplicity events: (left) for dimuon candidates as a function of dimuon mass, and (right) for $\phi(1020)$ candidates as a function of candidate \pt.; 00000 \hlttwo trigger efficiencies of the dedicated selections for low-multiplicity events: (left) for dimuon candidates as a function of dimuon mass, and (right) for $\phi(1020)$ candidates as a function of candidate \pt.; 00013 Beauty candidates used for the evaluation of the trigger performance.; 00012 Resolution of the $x$ (left) and $y$ (right) components of the impact parameter comparing the 2012 (blue), 2015 (orange), 2016 (red) and 2017 (green) data-taking periods. The resolution as a function of \pt is given in the bottom right corner.; 00011 Charm candidates used for the evaluation of the trigger performance.; 00024 Efficiencies per signal mode for (top) 2016 and (bottom) 2017 data-taking periods measured in simulation. Red (left-slanted) hatched plots are when the entire \lz bandwith is granted to this signal mode, whereas blue (right-slanted) hatched plots are following the bandwidth division. Signals which appear only in blue are used for performance validation and are not part of the optimization itself. Channels followed by ``(S)'' are selected in a kinematic and geometric volume which is particularly important for spectroscopy studies.; Fulltext from Publisher

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2018-03-22
10:49
Mapping the material in the LHCb vertex locator using secondary hadronic interactions / Alexander, M. (Glasgow U.) ; Barter, W. (Manchester U.) ; Bay, A. (Ecole Polytechnique, Lausanne) ; Bel, L.J. (NIKHEF, Amsterdam) ; van Beuzekom, M. (NIKHEF, Amsterdam) ; Bogdanova, G. (SINP, Moscow) ; Borghi, S. (Manchester U.) ; Bowcock, T.J.V. (Liverpool U.) ; Buchanan, E. (Bristol U.) ; Buytaert, J. (CERN) et al.
Precise knowledge of the location of the material in the LHCb vertex locator (VELO) is essential to reducing background in searches for long-lived exotic particles, and in identifying jets that originate from beauty and charm quarks. Secondary interactions of hadrons produced in beam-gas collisions are used to map the location of material in the VELO. [...]
CERN-LHCb-DP-2018-002; CERN-LHCB-DP-2018-002; arXiv:1803.07466.- 2018-06-13 - 11 p. - Published in : JINST 13 (2018) P06008 Fulltext: PDF; Fulltext from Publisher: PDF; External link: Figures, tables and other information

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2018-03-14
07:21
Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2 / Aaij, Roel (NIKHEF, Amsterdam) ; Anderlini, L. (INFN, Florence) ; Benson, S. (NIKHEF, Amsterdam) ; Cattaneo, Marco (CERN) ; Charpentier, Philippe (CERN) ; Clemencic, Marco (CERN) ; Falabella, Antonio (INFN, Bologna) ; Ferrari, Fabio (INFN, Bologna) ; Fontana, M. (CERN) ; Gligorov, Vladimir Vava (Paris U., VI-VII) et al.
Since 2015, with the restart of the LHC for its second run of data taking, the LHCb experiment has been empowered with a dedicated computing model to select and analyse calibration samples to measure the performance of the particle identification (PID) detectors and algorithms. The novel technique was developed within the framework of the innovative trigger model of the LHCb experiment, which relies on online event reconstruction for most of the datasets, reserving offline reconstruction to special physics cases. [...]
LHCb-DP-2018-001; LHCB-DP-2018-001; arXiv:1803.00824.- 2019-02-28 - Published in : EPJ Tech. Instrum. 6 (2019) 1 Fulltext: PDF; Fulltext from Publisher: PDF;

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2018-01-16
15:02
The HeRSCheL detector: high-rapidity shower counters for LHCb / Akiba, K.Carvalho (Rio de Janeiro Federal U.) ; Alessio, F. (CERN) ; Bondar, N. (CERN ; St. Petersburg, INP) ; Byczynski, W. (CERN) ; Coco, V. (CERN) ; Collins, P. (CERN) ; Dumps, R. (CERN) ; Dzhelyadin, R. (Serpukhov, IHEP) ; Gandini, P. (Oxford U.) ; Gruberg Cazon, B. R. (Oxford U.) et al.
The HeRSCheL detector consists of a set of scintillating counters, designed to increase the coverage of the LHCb experiment in the high-rapidity regions on either side of the main spectrometer. The new detector improves the capabilities of LHCb for studies of diffractive interactions, most notably Central Exclusive Production. [...]
LHCB-DP-2016-003; arXiv:1801.04281; CERN-LHCB-DP-2016-003.- 2018-04-12 - 20 p. - Published in : JINST 13 (2018) P04017 Fulltext: PDF; Fulltext from Publisher: PDF; Preprint: PDF; External link: Figures, tables and other information

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2017-08-04
07:48
Improved performance of the LHCb Outer Tracker in LHC Run 2 / d'Argent, Ph. (Heidelberg U.) ; Dufour, L. (NIKHEF, Amsterdam) ; Grillo, L. (Milan Bicocca U.) ; de Vries, J.A. (NIKHEF, Amsterdam) ; Ukleja, A. (Warsaw, Inst. Nucl. Studies) ; Aaij, R. (CERN) ; Archilli, F. (NIKHEF, Amsterdam) ; Bachmann, S. (Heidelberg U.) ; Berninghoff, D. (Heidelberg U.) ; Birnkraut, A. (Tech. U., Dortmund (main)) et al. /LHCb Outer Tracker group
The LHCb Outer Tracker is a gaseous detector covering an area of $5\times 6 m^2$ with 12 double layers of straw tubes. The performance of the detector is presented based on data of the LHC Run 2 running period from 2015 and 2016. [...]
CERN-LHCB-DP-2017-001; arXiv:1708.00819.- 2017-11-20 - 28 p. - Published in : JINST 12 (2017) P11016 Fulltext: PDF; Preprint: PDF;

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2016-04-21
08:37
Tesla : an application for real-time data analysis in High Energy Physics / Aaij, R. (CERN) ; Amato, S. (Rio de Janeiro Federal U.) ; Anderlini, L. (INFN, Florence) ; Benson, S. (CERN) ; Cattaneo, M. (CERN) ; Clemencic, M. (CERN) ; Couturier, B. (CERN) ; Frank, M. (CERN) ; Gligorov, V.V. (Paris U., VI-VII) ; Head, T. (LPHE, Lausanne) et al.
Upgrades to the LHCb computing infrastructure in the first long shutdown of the LHC have allowed for high quality decay information to be calculated by the software trigger making a separate offline event reconstruction unnecessary. Furthermore, the storage space of the triggered candidate is an order of magnitude smaller than the entire raw event that would otherwise need to be persisted. [...]
CERN-LHCB-DP-2016-001; arXiv:1604.05596; CERN-LHCB-DP-2016-001.- 2016-11 - 8 p. - Published in : Comput. Phys. Commun. 208 (2016) 35-42 Fulltext: PDF; Preprint: PDF; External link: Preprint

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2014-12-22
07:58
LHCb Detector Performance / LHCb collaboration
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. [...]
LHCB-DP-2014-002; CERN-PH-EP-2014-290; arXiv:1412.6352; CERN-PH-EP-2014-290; LHCB-DP-2014-002; CERN-LHCB-DP-2014-002.- Geneva : CERN, 2015-03-05 - 73 p. - Published in : Int. J. Mod. Phys. A 30 (2015) 1530022 Preprint: PDF; World Scientific Open Access article: PDF; External link: Preprint

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2014-08-07
09:53
Measurement of the track reconstruction efficiency at LHCb / LHCb collaboration
The determination of track reconstruction efficiencies at LHCb using $J/\psi\rightarrow\mu^{+}\mu^{-}$ decays is presented. Efficiencies above $95\%$ are found for the data taking periods in 2010, 2011, and 2012. [...]
CERN-LHCB-DP-2013-002; arXiv:1408.1251; CERN-LHCB-DP-2013-002; LHCB-DP-2013-002.- 2015-02-12 - 24 p. - Published in : JINST 10 (2015) P02007 Fulltext: PDF; IOP Open Access article: PDF; Preprint: PDF; External link: Preprint

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2014-06-05
20:23
Performance of the LHCb Vertex Locator / Aaij, R. (NIKHEF, Amsterdam) ; Affolder, A. (Liverpool U.) ; Akiba, K. (UFRJ, Rio de Janeiro) ; Alexander, M. (Glasgow U.) ; Ali, S. (NIKHEF, Amsterdam) ; Appleby, R.B. (Manchester U.) ; Artuso, M. (Syracuse U. (main)) ; Bates, A. (Glasgow U.) ; Bay, A. (Ecole Polytechnique, Lausanne) ; Behrendt, O. (CERN) et al. /LHCb VELO Group
The Vertex Locator (VELO) is a silicon microstrip detector that surrounds the proton-proton interaction region in the LHCb experiment. The performance of the detector during the first years of its physics operation is reviewed. [...]
CERN-LHCB-DP-2014-001; arXiv:1405.7808; CERN-LHCB-DP-2014-001; LHCB-DP-2014-001.- 2014 - 61 p. - Published in : JINST 9 (2014) P09007 Fulltext: PDF; IOP Open Access article: PDF; Preprint: PDF; External link: Preprint

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2013-11-18
04:11
Performance of the LHCb Outer Tracker / Arink, R (NIKHEF, Amsterdam) ; Bachmann, S. (Heidelberg U.) ; Bagaturia, Y. (Heidelberg U.) ; Band, H. (NIKHEF, Amsterdam) ; Bauer, Th. (NIKHEF, Amsterdam) ; Berkien, A. (NIKHEF, Amsterdam) ; Farber, Ch. (Heidelberg U.) ; Bien, A. (Heidelberg U.) ; Blouw, J. (Heidelberg U.) ; Ceelie, L. (NIKHEF, Amsterdam) et al. /LHCb Outer Tracker group
The LHCb Outer Tracker is a gaseous detector covering an area of 5x6 m2 with 12 double layers of straw tubes. The detector with its services are described together with the commissioning and calibration procedures. [...]
LHCB-DP-2013-003; arXiv:1311.3893; LHCB-DP-2013-003; CERN-LHCB-DP-2013-003.- 2014 - 30 p. - Published in : JINST 9 (2014) P01002 Fulltext: PDF; IOP Open Access article: PDF; External link: Preprint

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