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2021-04-13
15:03
OpenAccess [PUBDB-2021-01782] Journal Article
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Dynamic Distribution of High-Rate Data Processing from CERN to Remote HPC Data Centers
[FERMILAB-PUB-21-118-SCD]
The prompt reconstruction of the data recorded from the Large Hadron Collider (LHC) detectors has always been addressed by dedicated resources at the CERN Tier-0. Such workloads come in spikes due to the nature of the operation of the accelerator and in special high load occasions experiments have commissioned methods to distribute (spill-over) a fraction of the load to sites outside CERN. [...]
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2021-04-13
14:07
OpenAccess [PUBDB-2021-01781] Journal Article
; ; ; et al
The 6th Post-Newtonian Potential Terms at $O(G_N^4)$
[DESY-20-199; DO-TH 20/06; SAGEX-20-08; arXiv:2101.08630]
We calculate the potential contributions of the Hamiltonian in harmonic coordinates up 6PN for binary mass systems to $O(G_N^4)$ and perform comparisons to recent results in the literature 1 and 2..
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2021-04-13
12:12
OpenAccess [PUBDB-2021-01780] Preprint
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Precision luminosity measurement in proton-proton collisions at $\sqrt{s} =$ 13 TeV in 2015 and 2016 at CMS
[CERN-EP-2021-033; CMS-LUM-17-003; arXiv:2104.01927]
The measurement of the luminosity recorded by the CMS detector installed at LHC interaction point 5, using proton-proton collisions at $\sqrt{s} =$ 13 TeV in 2015 and 2016, is reported. The absolute luminosity scale is measured for individual bunch crossings using beam-separation scans (the van der Meer method), with a relative precision of 1.2% and 1.0% in 2015 and 2016, respectively. [...]
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2021-04-13
12:06
OpenAccess [PUBDB-2021-01779] Journal Article
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In-Situ High-Energy X-ray Diffraction Study of Austenite Decomposition During Rapid Cooling and Isothermal Holding in Two HSLA Steels
In-situ high-energy X-ray diffraction experiments with high temporal resolution during rapid cooling (280 °C s$^{−1}$) and isothermal heat treatments (at 450 °C, 500 °C, and 550 °C for 30 minutes) were performed to study austenite decomposition in two commercial high-strength low-alloy steels. The rapid phase transformations occurring in these types of steels are investigated for the first time in-situ, aiding a detailed analysis of the austenite decomposition kinetics. [...]
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2021-04-12
15:35
OpenAccess [PUBDB-2021-01774] Journal Article
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May the four be with you: Novel IR-subtraction methods to tackle NNLO calculations
[IFIC/20-54; MPP-2020-218; P3H-20-079; TTP20-043; arXiv:2012.02567]
In this manuscript, we report the outcome of the topical workshop: paving the way to alternative NNLO strategies (https://indico.ific.uv.es/e/WorkStop-ThinkStart_3.0), by presenting a discussion about different frameworks to perform precise higher-order computations for high-energy physics. These approaches implement novel strategies to deal with infrared and ultraviolet singularities in quantum field theories. [...]
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2021-04-12
13:40
OpenAccess [PUBDB-2021-01772] Preprint
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High precision measurements of Z boson production in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
[CERN-EP-2021-039; CMS-HIN-19-003; arXiv:2103.14089]
The CMS experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatible with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. [...]
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2021-04-12
13:35
OpenAccess [PUBDB-2021-01771] Preprint

Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$
[CMS-PAS-HIG-20-017]
A search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons using proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ at the LHC is reported. The data sample corresponds to an integrated luminosity of $137~\mathrm{fb}^{-1}$ collected with the CMS detector. [...]
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2021-04-12
13:33
OpenAccess [PUBDB-2021-01770] Preprint

Search for a W$^\prime$ boson decaying to a top and a bottom quark at $\sqrt{s}=13~\mathrm{TeV}$
[CMS-PAS-B2G-20-005]
A search is performed for a W$^\prime$ boson decaying to a top and a bottom quark in proton-proton collisions at a center-of-mass energy of $13~\mathrm{TeV}$. The analyzed data have been collected by the CMS Collaboration between 2016 and 2018 and correspond to an integrated luminosity of $137~\mathrm{fb}^{-1}$. [...]
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2021-04-12
11:12
OpenAccess [PUBDB-2021-01769] Journal Article

Rietveld refinement of the low temperature crystal structures of Cs$_{2}$XSi$_{5}$O$_{12}$ (X=Cu, Cd and Zn)
The synthetic leucite silicate framework mineral analogues Cs$_{2}$XSi$_{5}$O$_{12}$ (X = Cu, Cd, Zn) were prepared by high-temperature solid-state synthesis. The results of Rietveld refinement, using 18 keV synchrotron X-ray powder diffraction data collected at low temperatures (8K X = Cu, Zn; 10K X = Cd) show that the title compounds crystallize in the space group Pbca and are isostructural with the ambient temperature structures of these analogues. [...]
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2021-04-12
09:43
OpenAccess [PUBDB-2021-01766] Journal Article
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A Self-Referenced In-Situ Arrival Time Monitor for X-Ray Free-Electron Lasers
We present a novel, highly versatile, and self-referenced arrival time monitor for measuring the femtosecond time delay between a hard X-ray pulse from a free-electron laser and an optical laser pulse, measured directly on the same sample used for pump-probe experiments. Two chirped and picosecond long optical supercontinuum pulses traverse the sample with a mutually fixed time delay of 970 fs, while a femtosecond X-ray pulse arrives at an instant in between both pulses. [...]
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