CERN Accelerating science

Preprints

Последние добавления:
2018-09-19
13:49
Effets chromatiques et passage de la transition à grand \Delta.p/p / Faugeras, P E ; Faugier, A ; Gareyte, J
CERN-SPS-Improvement-Report-130.
- 1978. - 12 p.

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2018-09-19
09:31
Effective spill times, RF and LQE servo / Actis, P ; Burnod, L ; d'Amico, E ; Ferioli, G ; Mann, J ; de Vries, J
CERN-SPS-Improvement-Report-126.
- 1978. - 8 p.

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2018-09-19
06:08
Sampling the Riemann-Theta Boltzmann Machine / Carrazza, Stefano (CERN) ; Krefl, Daniel (CERN)
We show that the visible sector probability density function of the Riemann-Theta Boltzmann machine corresponds to a gaussian mixture model consisting of an infinite number of component multi-variate gaussians. [...]
arXiv:1804.07768 ; CERN-TH-2018-085.
- 2018.
00005 Sampling examples for RTBMs fitted to GOOG (upper plot) and XOM (lower plot) stock daily return distributions (in percent). Each sample contains $N_{s}=10^5$ elements. The red curve is the corresponding RTBM model. The blue histogram is the empirical data. The gray histogram is sampled from the RTBM model. - 00004 Sampling examples for RTBMs fitted to GOOG (upper plot) and XOM (lower plot) stock daily return distributions (in percent). Each sample contains $N_{s}=10^5$ elements. The red curve is the corresponding RTBM model. The blue histogram is the empirical data. The gray histogram is sampled from the RTBM model. - 00007 Sampling examples for RTBMs trained on the Gamma ($N_h=2$), Cauchy ($N_h=3$) and Gaussian mixture ($N_h=3$) distributions. Each sample contains $N_{s}=10^5$ elements. The blue curve represent the underlying distribution while the red curve is the corresponding RTBM model. The gray histogram is sampled from the RTBM model. - 00000 Sampling examples for RTBMs trained on the Gamma ($N_h=2$), Cauchy ($N_h=3$) and Gaussian mixture ($N_h=3$) distributions. Each sample contains $N_{s}=10^5$ elements. The blue curve represent the underlying distribution while the red curve is the corresponding RTBM model. The gray histogram is sampled from the RTBM model. - 00008 Sampling examples for RTBMs trained on the Gamma ($N_h=2$), Cauchy ($N_h=3$) and Gaussian mixture ($N_h=3$) distributions. Each sample contains $N_{s}=10^5$ elements. The blue curve represent the underlying distribution while the red curve is the corresponding RTBM model. The gray histogram is sampled from the RTBM model. - 00001 Illustration of the infinite gaussian mixture model interpretation of the visible sector probability density of the RTBM in the $N_h=N_v=1$ case. One continuous gaussian in the visible sector domain is associated to each possible hidden state (lattice point in the hidden state space). The contribution of each continuous gaussian is weighted by the discrete gaussian hidden sector probability density function evaluated at the associated hidden state and summed to yield the visible sector probability density function. - 00002 Illustration of the discrete gaussian sampling procedure. The blue dots mark the integer points included in the ellipsoid of radius $R$ used to calculate the Riemann-Theta function (with $N_h=2$) to precision $\epsilon$. The orange dot corresponds to ${\mathbf E}(h)$ and the circles are the contour lines of $P(h)$, with $h$ taken continuous. - 00003 Example of an affine transform. The RTBM model from figure \ref{Sampling2dFig} (red lines) is scaled, rotated and translated accordingly to the expressions in section \ref{lineartransfsec} (black lines). The affine transform is also applied to the sampling histogram. - 00006 Sampling of a multivariate Gaussian mixture fitted by a RTBM model with $N_h=2$. The contour plot of the trained model is shown together with its projections along the two axis. The blue line corresponded to the underlying true distribution, the red line to the RTBM model and the histogram show the samples generated by the RTBM model. - Fulltext

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2018-09-18
17:02
Search for invisible Higgs boson decays in vector boson fusion at $\sqrt{s} = 13$ TeV with the ATLAS detector
We report a search for Higgs bosons that are produced via vector boson fusion and subsequently decay into invisible particles. [...]
CERN-EP-2018-184.
- 2018.
Fulltext - Previous draft version

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2018-09-18
10:36
New results on collectivity in small systems with CMS / Milosevic, Jovan (VINCA Inst. Nucl. Sci., Belgrade) /CMS Collaboration
The elliptic ($\upsilon_{2}$) flow of prompt D$^{0}$ mesons, together with K$^{0}_{S}$, $\Lambda$, $\Xi$, and $\Omega$ in high-multiplicity pPb collisions at 8.16~TeV, is presented. The data are collected with the CMS detector at the LHC from the rapidity interval $-1.46 < y_{cm} < 0.54$ and transverse momentum range 1.5 $< \mathrm{p_{T}} <$ 8~GeV. [...]
CMS-CR-2018-172.- Geneva : CERN, 2018 - 7 p. Fulltext: PDF;
In : Sixth Annual Conference on Large Hadron Collider Physics, Bologna, Italy, 4 - 9 Jun 2018

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2018-09-18
09:36
Gauge invariance for a class of tree diagrams in the standard model / Wu, Tai Tsun (Harvard U. (main)) ; Wu, Sau Lan (Wisconsin U., Madison)
For gauge theory, the matrix element for any physical process is independent of the gauge used. [...]
CERN-TH-2018-198.
- 25 p.
Full text

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2018-09-18
07:24
Axion-Like Particles at Future Colliders / Bauer, Martin (Heidelberg U.) ; Heiles, Mathias (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Neubert, Matthias (Mainz U., Inst. Phys. ; U. Mainz, PRISMA ; Cornell U., LEPP) ; Thamm, Andrea (CERN)
Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons of spontaneously broken global symmetries in high-energy extensions of the Standard Model (SM). [...]
arXiv:1808.10323.
- 38 p.
Fulltext

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2018-09-17
18:22
Search for invisible decays of a Higgs boson produced through vector boson fusion in proton-proton collisions at $\sqrt{s} = $ 13 TeV
A search for invisible decays of a Higgs boson is performed using proton-proton collision data at $\sqrt{s} = $ 13 TeV collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. [...]
CERN-EP-2018-139 ; CMS-HIG-17-023-004.
- 2018.
Additional information for the analysis - CMS AuthorList - Fulltext

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2018-09-17
11:10
Experimental results using the decay of the Higgs to taus and muons / Meyer, Mareike (DESY) /ATLAS and CMS Collaborations
Precise measurements of the Higgs boson Yukawa couplings provide important tests of the Standard Model of particle physics. This review summarizes the current status of the analyses performed by the ATLAS and CMS experiments that search for the Higgs boson decay into a pair of muons. [...]
CMS-CR-2018-165.- Geneva : CERN, 2018 - 8 p. Fulltext: PDF;
In : Sixth Annual Conference on Large Hadron Collider Physics, Bologna, Italy, 4 - 9 Jun 2018

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2018-09-17
11:09
SEARCHES FOR DARK MATTER PARTICLES AT THE LHC / Felcini, Marta (University Coll., Dublin) /ATLAS ,CMS and SUSY Collaborations
The searches for new particles that could be constituents of the dark matter in the universe are an essential part of the physics program of the experiments at the Large Hadron Collider. An overview of recent dark matter candidate searches is presented with a focus on new results obtained by the ATLAS and CMS experiments from the analysis of the proton-proton collision data at 13 TeV center-of-mass energy collected in the first part of Run 2..
CMS-CR-2018-176.- Geneva : CERN, 2018 - 11 p. Fulltext: PDF;
In : 53rd Rencontres de Moriond on Cosmology, La Thuile, Italy, 17 - 24 Mar 2018

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