CERN Accelerating science

LHCb Conference Proceedings

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2015-05-29
11:16
LHCb Topological Trigger Reoptimization / Likhomanenko, T (National Research Centre Kurchatov Institute, Moscow, Russia) ; Ilten, P (Massachusetts Institute of Technology, Cambridge, MA, United States) ; Khairullin, E (Yandex School of Data Analysis, Moscow, Russia) ; Rogozhnikov, A (Yandex School of Data Analysis, Moscow, Russia) ; Ustyuzhanin, A (National Research Centre Kurchatov Institute, Moscow, Russia) ; Williams, M (Massachusetts Institute of Technology, Cambridge, MA, United States)
The main b-physics trigger algorithm used by the LHCb experiment is the so- called topological trigger. The topological trigger selects vertices which are a) detached from the primary proton-proton collision and b) compatible with coming from the decay of a b-hadron. [...]
LHCb-PROC-2015-018; CERN-LHCb-PROC-2015-018.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-29
11:03
SIMD studies in the LHCb reconstruction software / Campora Perez, D H (CERN, Geneva, Switzerland) ; Couturier, B (CERN, Geneva, Switzerland)
During the data taking process in the LHC at CERN, millions of collisions are recorded every second by the LHCb Detector. The LHCb Online computing farm, counting around 15000 cores, is dedicated to the reconstruction of the events in real-time, in order to filter those with interesting Physics. [...]
LHCb-PROC-2015-017; CERN-LHCb-PROC-2015-017.- Geneva : CERN, 2015 - 7 p. Fulltext: PDF;

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2015-05-29
10:51
How the Monte Carlo production of a wide variety of different samples is centrally handled in the LHCb experiment / Corti, G (CERN, Geneva, Switzerland) ; Charpentier, Ph (CERN, Geneva, Switzerland) ; Clemencic, M (CERN, Geneva, Switzerland) ; Closier, J (CERN, Geneva, Switzerland) ; Couturier, B (CERN, Geneva, Switzerland) ; Kreps, M (Department of Physics, University of Warwick, Coventry, United Kingdom) ; Mathe, Z (CERN, Geneva, Switzerland) ; O'Hanlon, D (Department of Physics, University of Warwick, Coventry, United Kingdom) ; Robbe, P (LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France) ; Romanovsky, V (Institute for High Energy Physics (IHEP), Protvino, Russia) et al.
In the LHCb experiment a wide variety of Monte Carlo simulated samples needs to be produced for the experiment's physics program. Monte Carlo productions are handled centrally similarly to all massive processing of data in the experiment. [...]
LHCb-PROC-2015-016; CERN-LHCb-PROC-2015-016.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-29
10:40
Jobs masonry in LHCb with elastic Grid Jobs / Stagni, F (CERN, Geneva, Switzerland) ; Charpentier, Ph (CERN, Geneva, Switzerland)
In any distributed computing infrastructure, a job is normally forbidden to run for an indefinite amount of time. This limitation is implemented using different technologies, the most common one being the CPU time limit implemented by batch queues. [...]
LHCb-PROC-2015-015; CERN-LHCb-PROC-2015-015.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-29
10:31
Pilots 2.0: DIRAC pilots for all the skies / Stagni, F (CERN, Geneva, Switzerland) ; Tsaregorodtsev, A (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France) ; McNab, A (School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom) ; Luzzi, C (CERN, Geneva, Switzerland)
In the last few years, new types of computing infrastructures, such as IAAS (Infrastructure as a Service) and IAAC (Infrastructure as a Client), gained popularity. New resources may come as part of pledged resources, while others are opportunistic. [...]
LHCb-PROC-2015-014; CERN-LHCb-PROC-2015-014.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-28
16:21
The LHCb Turbo Stream / Benson, Sean (CERN, Geneva, Switzerland,) ; Gligorov, Vladimir (CERN, Geneva, Switzerland,) ; Vesterinen, Mika Anton (Physikalisches Institut, Ruprecht-Karls-Universitat Heidelberg, Heidelberg, Germany) ; Williams, John Michael (Massachusetts Institute of Technology, Cambridge, MA, United States)
The LHCb experiment will record an unprecedented dataset of beauty and charm hadron decays during Run II of the LHC, set to take place between 2015 and 2018. A key computing challenge is to store and process this data, which limits the maximum output rate of the LHCb trigger. [...]
LHCb-PROC-2015-013; CERN-LHCb-PROC-2015-013.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-22
17:12
Optimization of the LHCb track reconstruction / Storaci, Barbara (Physik-Institut, Universität Zürich, Zürich, Switzerland)
The LHCb track reconstruction uses sophisticated pattern recognition algorithms to reconstruct trajectories of charged particles. Their main feature is the use of a Hough- transform like approach to connect track segments from different sub-detectors, allowing for having no tracking stations in the magnet of LHCb. [...]
LHCb-PROC-2015-012; CERN-LHCb-PROC-2015-012.- Geneva : CERN, 2015 - 6 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-22
15:59
Real-time alignment and calibration of the LHCb Detector in Run II / Dujany, Giulio (School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom) ; Storaci, Barbara (Physik-Institut, Universität Zürich, Zürich, Switzerland)
Stable, precise spatial alignment and PID calibration are necessary to achieve optimal detector performance. During Run2, LHCb will have a new real-time detector alignment and calibration to allow equivalent performance in the online and offline reconstruction to be reached. [...]
LHCb-PROC-2015-011; CERN-LHCb-PROC-2015-011.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;
In : 21st Conference in High Energy and Nuclear Physics 2015, Okinawa, Japan, 13 - 17 Apr 2015

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2015-05-18
15:19
Measurement of $CP$-Violating Phases in $B$ Decays at LHCb / Hussain, Nazim (University of Oxford, United Kingdom)
A selection of recent LHCb results pertaining to measurements of the CKM unitarity triangle are presented. In these proceedings, I summarise a measurement of $\sin(2\beta)$, the most precise time-dependent $CP$ violation measurement made at a hadron collider yet, as well as the latest LHCb $\gamma$ combination, a measurement of greater precision than the $B$ factories. [...]
LHCb-PROC-2015-010; CERN-LHCb-PROC-2015-010.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 50th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 21 - 28 Mar 2015

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2015-05-07
12:18
Study of photon reconstruction efficiency using $B^+\to J/\psi K^{(*)+}$ decays in the LHCb experiment / Govorkova, Ekaterina (Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia)
The reconstruction efficiency of photons and neutral pions is measured using the relative yields of reconstructed $B^+\to J/\psi K^{*+} (\to K^+\pi^0)$ and $B^+\to J/\psi K^+$decays. The efficiency is studied using the data set, corresponding to an integrated luminosity of $3~\mathrm{fb}^{-1}$, collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8 $TeV$..
LHCb-PROC-2015-009; CERN-LHCb-PROC-2015-009; arXiv:1505.02960.- Geneva : CERN, 2015 Fulltext: LHCb-PROC-2015-009 - PDF; arXiv:1505.02960 - PDF; External link: Fulltext
In : 18th International Moscow School of Physics (43rd ITEP Winter School), Odintsovsky, Moscow, Russia, 17 - 24 Feb 2015

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