# CERN Preprints

2017-06-29
07:17
 Large width effects in processes of production of extra quarks decaying to Dark Matter at the LHC / Prager, Hugo (Rutherford ; Southampton U.) ; Moretti, Stefano (Rutherford ; Southampton U. ; CERN) ; O'Brien, Dermot (Rutherford ; Southampton U.) ; Panizzi, Luca (Rutherford ; Southampton U. ; Genoa U. ; INFN, Genoa) This paper explores the effects of finite width in processes of pair production of a heavy eXtra Quark (XQ) with charge 2/3 and its subsequent decay into a Dark Matter (DM) candidate -- either scalar or vector -- and Standard Model (SM) up-type quarks at the Large Hadron Collider (LHC). This dynamics has been ignored so far in standard experimental searches of heavy quarks decaying to DM and we assess herein the regions of validity of current approaches, based on the assumption that the XQ has a narrow width. [...] arXiv:1706.04007.- 2017-06-13 - 7 p. Fulltext: PDF; In : 25th International Workshop on Deep Inelastic Scattering and Related Topics, Birmingham, UK, 03 - 07 Apr 2017, pp.

2017-06-29
07:17
 Extra Quarks Decaying to Dark Matter Beyond the Narrow Width Approximation / Prager, Hugo (Rutherford ; Southampton U.) ; Moretti, Stefano (Rutherford ; Southampton U. ; CERN) ; O'Brien, Dermot (Rutherford ; Southampton U.) ; Panizzi, Luca (Rutherford ; Southampton U. ; Genoa U. ; INFN, Genoa) We explore the effects induced by a finite width in processes of pair production of a heavy top-quark partner and its subsequent decay into a bosonic Dark Matter (DM) candidate -- either scalar or vector -- and a SM up-type quark at the Large Hadron Collider (LHC). We discuss the configurations of masses, widths and couplings where this phenomenology can be important in a simple model with just one such objects. [...] arXiv:1706.04001.- 2017-06-13 - 5 p. Fulltext: PDF; In : 5th Conference on Large Hadron Collider Physics 2017, Shanghai, China, 15 - 20 May 2017, pp.

2017-06-28
18:27
 A Vertex and Tracking Detector System for CLIC / Nurnberg, Andreas Matthias (CERN) The physics aims at the proposed future CLIC high-energy linear $e^+e^−$ collider pose challenging demands on the performance of the detector system. In particular the vertex and tracking detectors have to combine precision measurements with robustness against the expected high rates of beam-induced backgrounds. [...] CLICdp-Conf-2017-013.- Geneva : CERN, 2017 - 7. Fulltext: PDF; In : International Conference on Technology and Instrumentation in Particle Physics 2017, Beijing, China, 21 - 26 May 2017

2017-06-28
18:21
 A multi-chip data acquisition system based on a heterogeneous system-on-chip platform / Fiergolski, Adrian (CERN) The Control and Readout Inner tracking BOard (CaRIBOu) is a versatile readout system targeting a multitude of detector prototypes. It profits from the heterogeneous platform of the Zynq System-on-Chip (SoC) and integrates in a monolithic device front-end FPGA resources with a back-end software running on a hard-core ARM-based processor. [...] CLICdp-Conf-2017-012.- Geneva : CERN, 2017 - 7. Fulltext: PDF; In : International Conference on Technology and Instrumentation in Particle Physics 2017, Beijing, China, 21 - 26 May 2017

2017-06-28
07:18
 New limits on heavy neutrinos from Kaon experiments at CERN / Massri, Karim (CERN) The NA48/2 and NA62-$R_K$ experiments at CERN collected large samples of charged kaon decays in 2003--2004 and 2007, respectively. These samples, collected with different trigger conditions, allow to search for both short and long-living heavy neutrinos produced in $K^{\pm}\to\mu^{\pm}N_4$ decays. [...] arXiv:1706.03553.- 2017-06-12 - 8 p. Fulltext: PDF;

2017-06-27
15:21
 Integrated CMOS sensor technologies for the CLIC tracker / Munker, Ruth Magdalena (University of Bonn (DE)) Integrated technologies are attractive candidates for an all silicon tracker at the proposed future multi-TeV linear e+e- collider CLIC. In this context CMOS circuitry on a high resistivity epitaxial layer has been studied using the ALICE Investigator test-chip. [...] CLICdp-Conf-2017-011.- Geneva : CERN, 2017 - 5. Fulltext: PDF; In : International Conference on Technology and Instrumentation in Particle Physics 2017, Beijing, China, 21 - 26 May 2017

2017-06-27
10:11
 Construction and first beam-tests of silicon-tungsten prototype modules for the CMS High Granularity Calorimeter for HL-LHC / Romeo, Francesco (Beijing, Inst. High Energy Phys.) /CMS Collaboration The High Granularity Calorimeter (HGCAL) is the technology choice of the CMS collaboration for the endcap calorimetry upgrade planned to cope with the harsh radiation and pileup environment at the High Luminosity-LHC. The HGCAL is realized as a sampling calorimeter, including an electromagnetic compartment comprising 28 layers of silicon pad detectors with pad areas of 0.5 - 1.0 square centimetres interspersed with absorbers. [...] CMS-CR-2017-169.- Geneva : CERN, 2017 - 7 p. Fulltext: PDF; In : International Conference on Technology and Instrumentation in Particle Physics 2017, Beijing, China, 21 - 26 May 2017

2017-06-27
08:02
 Exotic matter on singular divisors in F-theory / Klevers, Denis ; Morrison, David R. ; Raghuram, Nikhil ; Taylor, Washington We analyze exotic matter representations that arise on singular seven-brane configurations in F-theory. We develop a general framework for analyzing such representations, and work out explicit descriptions for models with matter in the 2-index and 3-index symmetric representations of SU($N$) and SU(2) respectively, associated with double and triple point singularities in the seven-brane locus. [...] CERN-TH-2016-252; MIT-CTP-4878; UCSB-MATH-2017-07; arXiv:1706.08194.- 2017-06-25 - 71 p. Fulltext: PDF;

2017-06-27
08:02
 $B$ decay anomalies from nonabelian local horizontal symmetry / Cline, James M. ; Martin Camalich, Jorge Recent anomalies in $B\to K^{(*)}\ell\ell$ meson decays are consistent with exchange of a heavy $Z'$ vector boson. Here we try to connect such new physics to understanding the origin of flavor, by gauging generation number. [...] CERN-TH-2017-136; arXiv:1706.08510.- 2017-06-26 - 12 p. Fulltext: PDF;

2017-06-27
08:02
 Production of muons from heavy-flavour hadron decays at forward rapidity in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02~{\rm TeV}$} / Zhang, Zuman /for the ALICE The measurement of the production of single muons from heavy-flavour hadron decays at forward rapidity in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02~{\rm TeV}$ collected in 2015 is presented as a function of transverse momentum ($p_{\rm T}$) and collision centrality. A strong suppression of the yield is observed at high $p_{\rm T}$ in the most central collisions compared to the binary-scaled expectation from pp collisions at the same energy. [...] arXiv:1706.07943.- 2017-06-24 Fulltext: PDF;