CERN Accelerating science

CERN Published Articles

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2017-01-21
07:23
Anomalous couplings in WZ production beyond NLO QCD / Campanario, Francisco (Valencia U. ; Valencia U., IFIC) ; Roth, Robin (Karlsruhe U., ITP) ; Sapeta, Sebastian (CERN) ; Zeppenfeld, Dieter (KIT, Karlsruhe, TP)
We study WZ production with anomalous couplings at $\bar{n}$NLO QCD using the LoopSim method in combination with the Monte Carlo program VBFNLO. Higher order corrections to WZ production are dominated by additional hard jet radiation. [...]
KA-TP-32-2016; arXiv:1612.03577.- 2016-12-12 - 11 p. - Published in : PoS: LHCP2016 (2016) , pp. 141
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In : 4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016, pp.141

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2017-01-20
07:22
The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration / Bruno, M. (Brookhaven) ; Dalla Brida, M. (INFN, Milan Bicocca ; NIC, Zeuthen) ; Fritzsch, P. (CERN ; Madrid, IFT) ; Korzec, T. (Bergische U., Wuppertal (main)) ; Ramos, A. (CERN) ; Schaefer, S. (NIC, Zeuthen) ; Simma, H. (NIC, Zeuthen) ; Sint, S. (Trinity Coll., Dublin) ; Sommer, R. (NIC, Zeuthen ; Humboldt U., Berlin)
We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. [...]
CERN-TH-2016-262; DESY-17-007; arXiv:1701.03075.- 2017-01-11 - 21 p. - Published in : PoS: LATTICE2016 (2016) , pp. 197 Fulltext: PDF;

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2017-01-20
07:22
Highly-sensitive superconducting circuits at ~700 kHz with tunable quality factors for image-current detection of single trapped antiprotons / Nagahama, H. (Wako, RIKEN ; Tokyo, U. Earth Sci. Astron.) ; Schneider, G. (Wako, RIKEN ; Mainz U., Inst. Phys.) ; Mooser, A. (Wako, RIKEN) ; Smorra, C. (Wako, RIKEN ; CERN) ; Sellner, S. (Wako, RIKEN) ; Harrington, J. (Heidelberg, Max Planck Inst.) ; Higuchi, T. (Wako, RIKEN ; Tokyo, U. Earth Sci. Astron.) ; Borchert, M. (Hannover, Max Planck Inst. Quantenopt.) ; Tanaka, T. (Wako, RIKEN ; Tokyo, U. Earth Sci. Astron.) ; Besirli, M. (Wako, RIKEN) et al.
We developed highly-sensitive image-current detection systems based on superconducting toroidal coils and ultra-low noise amplifiers for non-destructive measurements of the axial frequencies (550$\sim$800$\,$kHz) of single antiprotons stored in a cryogenic multi-Penning-trap system. The unloaded superconducting tuned circuits show quality factors of up to 500$\,$000, which corresponds to a factor of 10 improvement compared to our previously used solenoidal designs. [...]
arXiv:1612.08481.- 2016-11-18 - Published in : Rev.Sci.Instrum. 87 (2016) 113305 Fulltext: PDF;

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2017-01-19
14:15
A new approach for improved time and position measurements for TOF-PET: Time-stamping of the photo-electrons using analogue SiPMs / Doroud, K (CERN) ; Williams, M C S (CERN ; INFN, Bologna)
Measurement of the Time-of-Flight (TOF) of the 511 keV gammas brings an important reduction of statistical noise in the PET image, with higher precision time measurements producing clearer images. The common method of coupling a photodetector to scintillating crystals is to have two matching matrices, with a one-to-one coupling between the crystal and the photodetector. [...]
2016 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 849 (2017) 16-19 Elsevier Open Access article: PDF;

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2017-01-19
10:33
Sixfold improved single particle measurement of the magnetic moment of the antiproton / Nagahama, H (RIKEN (main) ; Tokyo, U. Earth Sci. Astron.) ; Smorra, C (RIKEN (main) ; CERN) ; Sellner, S (RIKEN (main)) ; Harrington, J (Heidelberg, Max Planck Inst.) ; Higuchi, T (RIKEN (main) ; Tokyo, U. Earth Sci. Astron.) ; Borchert, M J (Leibniz U., Hannover) ; Tanaka, T (RIKEN (main) ; Tokyo, U. Earth Sci. Astron.) ; Besirli, M (RIKEN (main)) ; Mooser, A (RIKEN (main)) ; Schneider, G (RIKEN (main) ; Mainz U., Inst. Phys.) et al.
Our current understanding of the Universe comes, among others, from particle physics and cosmology. In particle physics an almost perfect symmetry between matter and antimatter exists. [...]
2017 - Published in : Nature Comm. 8 (2017) 14084 Fulltext: PDF;

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2017-01-16
15:13
Impedance simulations and measurements on the LHC collimators with embedded beam position monitors / Biancacci, N (CERN) ; Caspers, F (CERN) ; Kuczerowski, J (CERN) ; Métral, (CERN.) ; Mounet, N (CERN) ; Salvant, B (CERN) ; Mostacci, A (Rome U.) ; Frasciello, O (Frascati) ; Zobov, M (Frascati)
The LHC collimation system is a critical element for the safe operation of the LHC machine. The necessity of fast accurate positioning of the collimator’s jaws, recently introduced the need to have button beam position monitors directly embedded in the jaws extremities of the LHC tertiary collimators and some secondary collimators. [...]
2016 - Published in : Phys. Rev. Accel. Beams 20 (2017) 011003 APS Open Access article: PDF;

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2017-01-16
11:17
Experimental overview on flow observables in heavy ion collisions / Mohapatra, Soumya (Columbia U.)
This paper summarizes the experimental results on flow phenomena that were presented at Quark matter 2015, with a focus on new flow observables and correlations in small systems. The results presented include event-shape selected pT spectra and vn measurements, correlations between flow harmonics of different orders, study of factorization breakdown in two-particle correlations, and principal component analysis of two-particle correlations. [...]
2016 - 8 p. - Published in : Nucl. Phys. A 956 (2016) 59-66 Elsevier Open Access article: PDF;
In : 25th International Conference on Ultra-relativistic Nucleus-nucleus Collisions, Kobe, Japan, 27 Sep - 4 Oct 2015, pp.59-66

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2017-01-16
10:31
Quarkonium production in p–Pb collisions with ALICE / Lakomov, Igor (CERN) /for the ALICE Collaboration
The production of quarkonia, bound states of quark and anti-quark pairs, is intensively studied both experimentally and theoretically. They are ideal probes of the Quark-Gluon Plasma (QGP) formed in heavy-ion collisions. [...]
2016 - Published in : Nucl. Part. Phys. Proc. 276-278 (2016) 265-268 Elsevier Open Access article: PDF;
In : 7th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Montreal, Québec, Canada, 29 Jun - 3 Jul 2015, pp.265-268

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2017-01-13
07:31
Higgs physics at the Future Circular Collider / d'Enterria, David (CERN)
The unique Higgs physics opportunities accessible at the CERN Future Circular Collider (FCC) in electron-positron ($\sqrt{s}$ = 125, 240, 350 GeV) and proton-proton ($\sqrt{s}$ = 100 TeV) collisions, are succinctly summarized. Thanks to the large c.m. [...]
arXiv:1701.02663.- 2017-01-10 - 8 p. - Published in : PoS: ICHEP2016 (2016) , pp. 434 Fulltext: PDF;

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2017-01-13
06:56
Review of Particle Physics, 2016-2017 / Patrignani, C (Bologna U. ; INFN, Bologna) ; Agashe, K (Maryland U.) ; Aielli, G (U. Rome 2, Tor Vergata (main)) ; Amsler, C (U. Bern, AEC ; Stefan Meyer Inst. Subatomare Phys.) ; Antonelli, M (Frascati) ; Asner, D M (PNL, Richland) ; Baer, H (Oklahoma U.) ; Banerjee, Sw (U. Louisville) ; Barnett, R M (LBL, Berkeley) ; Basaglia, T (CERN) et al. /Particle Data Group
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements from 721 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. [...]
2016 - 1808 p. - Published in : Chin. Phys. C 40 (2016) 100001 Fulltext: PDF;

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