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The LHCb upgrade I / LHCb Collaboration
The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. [...]
arXiv:2305.10515; LHCb-DP-2022-002.- 2024-05-23 - 232 p. - Published in : JINST 19 (2024) P05065 Fulltext: document - PDF; 2305.10515 - PDF;
In : The Large Hadron Collider and The Experiments for Run 3

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Ethernet for High-Throughput Computing at CERN / Krawczyk, Rafal (CERN) ; Colombo, Tommaso (CERN) ; Neufeld, Niko (CERN) ; Pisani, Flavio (CERN) ; Valat, Sebastien (Atos, Bezons, France)
When high throughput and utilization of fabric at close-to-the-link capacity are most needed in a cluster, Ethernet is a potential candidate, rivaling traditional HPC interconnects. The distributed real-time data acquisition at particle physics experiments presents an interesting use case. [...]
2022 - 11 p. - Published in : IEEE Trans. Parallel Distrib. Syst. 33 (2022) 3640-3650

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The LHCb DAQ Upgrade for LHC Run3 / Colombo, Tommaso (CERN) ; Durante, Paolo (CERN) ; Galli, Domenico (INFN, Bologna) ; Marconi, Umberto (INFN, Bologna) ; Neufeld, Niko (CERN) ; Pisani, Flavio (CERN ; INFN, Bologna ; Bologna U.) ; Schwemmer, Rainer (CERN) ; Valat, Sébastien (CERN) ; Voneki, Balazs (CERN)
In order to optimize the physics reach in the large hadron collider (LHC) Run3, foreseen in the years 2021 and beyond, the LHC beauty experiment collaboration has decided to re-design its detector and the data acquisition system (DAQ). The new detector will operate at the LHC bunch-crossing frequency of 40 MHz without hardware trigger. [...]
2019 - 4 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 982-985
In : 21st IEEE Real Time Conference, Williamsburg, Va, United States Of America, 9 - 15 Jun 2018, pp.982-985

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Feasibility tests of RoCE v2 for LHCb event building / Krawczyk, Rafał Dominik (CERN) ; Colombo, Tommaso (CERN) ; Neufeld, Niko (CERN) ; Pisani, Flavio (CERN ; U. Bologna (main)) ; Valat, Sébastien (Unlisted, FR)
This paper evaluates the utilization of Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE) for the Run 3 LHCb event building at CERN. The acquisition system of the detector will collect partial data from approximately 1000 separate detector streams. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 01011 Fulltext from publisher: PDF;
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.01011

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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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Determination of quantum numbers for several excited charmed mesons observed in $B^- \to D^{*+} \pi^- \pi^-$ decays / LHCb Collaboration
A four-body amplitude analysis of the $B^- \to D^{*+} \pi^- \pi^-$ decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. [...]
arXiv:1911.05957; CERN-EP-2019-201; LHCb-PAPER-2019-027; LHCB-PAPER-2019-027.- Geneva : CERN, 2020-02-21 - 24 p. - Published in : Phys. Rev. D 101 (2020) 032005 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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Measurement of the $\eta_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s} = 13$ TeV / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of $2.0\,fb^{-1}$, collected by the LHCb experiment, the production of the $\eta_c(1S)$ state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13 \text{ TeV}$ is studied in the rapidity range ${2.0 < y < 4.5}$ and in the transverse momentum range ${6.5 < p_{T} < 14.0\text{ GeV}}$. The cross-section for prompt production of $\eta_c(1S)$ mesons relative to that of the $J/\psi$ meson is measured using the ${p\bar{p}}$ decay mode and is found to be ${\sigma_{\eta_c(1S)}/\sigma_{J/\psi} = 1.69 \pm 0.15 \pm 0.10 \pm 0.18}$. [...]
arXiv:1911.03326; LHCb-PAPER-2019-024; CERN-EP-2019-214; LHCB-PAPER-2019-024.- 2020-03-02 - 29 p. - Published in : Eur. Phys. J. C 80 (2020) 191 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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A journey over the memory managment stack for HPC large applications on moderne architectures / Valat, Sébastien (speaker) (ATOS/Bull)
Memory managment has always been an issue for large application but the increase of memory space and intra-node thread-based parallelism now put lot more pressure on this complex part of the operating system stack. Althrough there is a long tradition of algorithm developpements on this topic with behind 60 years of research there is still a lot to do. This is even more true in large scale application where the size of the code (target was a million line C++/MPI app) and global complexity is a big limitation to apply what should theoritically be the clean way to proceed. [...]
2019 - 2455. other events or meetings; IXPUG 2019 Annual Conference at CERN External links: Talk details; Event details In : IXPUG 2019 Annual Conference at CERN

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Amplitude analysis of the $B^+ \to \pi^+ \pi^+ \pi^-$ decay / LHCb Collaboration
The results of an amplitude analysis of the charmless three-body decay $B^+ \to \pi^+ \pi^+ \pi^-$, in which $CP$-violation effects are taken into account, are reported. The analysis is based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. [...]
arXiv:1909.05212; LHCb-PAPER-2019-017; CERN-EP-2019-157; LHCB-PAPER-2019-017.- Geneva : CERN, 2020-01-21 - 46 p. - Published in : Phys. Rev. D 101 (2020) 012006 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP;

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Observation of several sources of $CP$ violation in $B^+ \to \pi^+ \pi^+ \pi^-$ decays / LHCb Collaboration
Observations are reported of different sources of $CP$ violation from an amplitude analysis of $B^+ \to \pi^+ \pi^+ \pi^-$ decays, based on a data sample corresponding to an integrated luminosity of $3 \; {\rm fb}^{-1}$ of $pp$ collisions recorded with the LHCb detector. A large $CP$ asymmetry is observed in the decay amplitude involving the tensor $f_2(1270)$ resonance, and in addition significant $CP$ violation is found in the $\pi^+ \pi^-$ S-wave at low invariant mass. [...]
arXiv:1909.05211; LHCb-PAPER-2019-018; CERN-EP-2019-156; LHCB-PAPER-2019-018.- 2020-01-21 - 11 p. - Published in : Phys. Rev. Lett. 124 (2020) 031801 Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP;

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Vedi anche: autori con nomi simili
258	VALAT, Sebastien
3	Valat, S
1	Valat, S J
11	Valat, S.
1	Valat, Sebastian
258	Valat, Sèbastien
258	Valat, Sébastien

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