# CERN Preprints

2014-12-18
19:11
 Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector The production of a $Z$ boson in association with a $J/\psi$ meson in proton--proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. [...] CERN-PH-EP-2014-276. - 2014. Fulltext - Previous draft version

2014-12-18
11:00
 Physics Performance with the CMS Pixel Detector / Meier, Frank (Nebraska U.) /CMS Collaboration A large fraction of the results produced by the LHC experiments during the first run were made possible by precision vertexing detectors. The all-silicon tracking detector of the CMS experiment uses a pixel detector to do vertexing. [...] CMS-CR-2014-437.- Geneva : CERN, 2014 - 6 p. Fulltext: PDF; In : Pixel 2014 7th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging, Niagara Falls, Ontario, Canada, 1 - 5 Sep 2014

2014-12-18
11:00
 CMS Data preparation for Run II / Fabozzi, Francesco (INFN, Naples ; Basilicata U., Potenza) /CMS Collaboration The Run II of the Large Hadron Collider will confront us with new challenges, mainly due to the higher number of interactions per bunch crossing and the reduced time distance between bunches. In order to be ready for the beginning of the run, in view of an early discovery, the CMS collaboration is currently evolving the infrastructure established during Run I to monitor the data quality, to validate the progresses on detector simulation, event reconstruction, physics objects definition, and to handle large production of simulated events. [...] CMS-CR-2014-428.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF; In : Conference Information and Promotion Committee (CIP) for the IEEE – Nuclear Science Symposium and Medical Imaging Conference, and Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors workshop (IEEE NSS-MIC), Seattle, WA, USA, 8 - 15 Nov 2014

2014-12-18
08:36
 Gauged R-symmetry and its anomalies in 4D N=1 supergravity and phenomenological implications / Antoniadis, I ; Ghilencea, D M ; Knoops, R We consider a class of models with gauged U(1)_R symmetry in 4D N=1 supergravity that have, at the classical level, a metastable ground state, an infinitesimally small (tunable) positive cosmological constant and a TeV gravitino mass. [...] arXiv:1412.4807 ; CERN-PH-TH-2014-242. - 2014. - 24 p. Preprint - Full text

2014-12-18
08:35
 Instantaneous stochastic perturbation theory / Lüscher, Martin (CERN ; Bern U.) A form of stochastic perturbation theory is described, where the representative stochastic fields are generated instantaneously rather than through a Markov process. [...] arXiv:1412.5311 ; CERN-PH-TH-2014-239. - 2014. - 25 p. Preprint - Full text

2014-12-18
08:28
 Phenomenology of theories of gravity without Lorentz invariance: the preferred frame case / Blas, Diego ; Lim, Eugene Theories of gravitation without Lorentz invariance are candidates of low-energy descriptions of quantum gravity [...] arXiv:1412.4828 ; CERN-PH-TH-2014-193. - 2014. - 38 p. Preprint - Full text

2014-12-15
16:48
 Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $\sqrt{s}=8$ TeV Using the ATLAS Detector / ATLAS Collaboration A measurement of spin correlation in $t\bar{t}$ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb$^{-1}$. [...] CERN-PH-EP-2014-257 ; arXiv:1412.4742. - 2014. - 7 p. Previous draft version - Full text - Full text

2014-12-15
16:40
 Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at 8 TeV / Keaveney, James Michael (Vrije U., Brussels) /CMS Collaboration A search is presented for standard model (SM) production of four top quarks (tttt) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb$^{-1}$ recorded at a centre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. [...] CMS-CR-2014-443.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF; In : TOP2014: 7th International Workshop on Top Quark Physics, Cannes, France, 29 Sep - 3 Oct 2014

2014-12-15
16:22
 LHC Injectors Upgrade Technical Design Report / Coupard, J ; Damerau, H ; Funken, A ; Garoby, R ; Gilardoni, S ; Goddard, B ; Hanke, K ; Lombardi, A ; Manglunki, D ; Meddahi, M et al. n/a CERN-ACC-2014-0337. - 2014. - 616 p.

2014-12-15
14:28
 Underlying Event and B-Hadron Decays in $t\overline{t}$ EventsUnderlying Event and B-Hadron Decays in top anti-top Events / Stieger, Benjamin Bastian (CERN) We present exploratory studies of the underlying event activity and of fragmentation and hadronization of b quarks using $t\overline{t}$ candidate events in proton-proton collision data acquired by the CMS experiment. [...] CMS-CR-2014-442 ; arXiv:1412.4047. - 2014. - 5 p. Full text - Preprint