# TH Articles

Последно добавени:
2013-12-05
04:17
 Dynamical sectors of a relativistic two particle model / Dominici, Daniele (INFN, Florence ; Florence U.) ; Gomis, Joaquim (CERN ; ICC, Barcelona U. ; Barcelona U., ECM) ; Kamimura, Kiyoshi (Toho U.) ; Longhi, Giorgio (Florence U. ; INFN, Florence) We reconsider a model of two relativistic particles interacting via a multiplicative potential, as an example of a simple dynamical system with sectors, or branches, with different dynamics and degrees of freedom.The presence or absence of sectors depends on the values of rest masses. Some aspects of the canonical quantization are described. [...] arXiv:1312.1000; CERN-PH-TH-2013-284; ICCUB-13-243.- 2014 - 15 p. - Published in : Phys. Rev. D 89 (2014) 045001 External link: Preprint

2013-11-27
04:19
 Monotop phenomenology at the Large Hadron Collider / Agram, Jean-Laurent (Haute Alsace U., IUT Colmar) ; Andrea, Jeremy (Strasbourg, IPHC) ; Buttignol, Michael (Haute Alsace U., IUT Colmar) ; Conte, Eric (Haute Alsace U., IUT Colmar) ; Fuks, Benjamin (Strasbourg, IPHC ; CERN) We investigate new physics scenarios where systems comprised of a single top quark accompanied by missing transverse energy, dubbed monotops, can be produced at the LHC. Following a simplified model approach, we describe all possible monotop production modes via an effective theory and estimate the sensitivity of the LHC, assuming 20 fb$^{-1}$ of collisions at a center-of-mass energy of 8 TeV, to the observation of a monotop state. [...] arXiv:1311.6478; CERN-PH-TH-2013-277.- 2014 - 17 p. - Published in : Phys. Rev. D 89 (2014) 014028 External link: Preprint

2013-10-28
04:12
 Constraints on light mediators: confronting dark matter searches with B physics / Schmidt-Hoberg, Kai (CERN) ; Staub, Florian (Bonn U.) ; Winkler, Martin Wolfgang (DESY) Light scalars appear in many well-motivated extensions of the Standard Model including supersymmetric models with additional gauge singlets. Such scalars could mediate the interactions between dark matter and nuclei, giving rise to the tentative signals observed by several dark matter direct detection experiments including CDMS-Si. [...] arXiv:1310.6752; CERN-PH-TH-2013-250; BONN-TH-2013-22; DESY 13-192.- 2013 - 6 p. - Published in : Phys. Lett. B 727 (2013) 506-510 External link: Preprint

2013-10-18
04:16
 A No-Scale Framework for Sub-Planckian Physics / Ellis, John (King's Coll. London ; CERN) ; Nanopoulos, Dimitri V (Texas A-M) ; Olive, Keith A (Minnesota U.) We propose a minimal model framework for physics below the Planck scale with the following features: (i) it is based on no-scale supergravity, as favoured in many string compactifications, (ii) it incorporates Starobinsky-like inflation, and hence is compatible with constraints from the Planck satellite, (iii) the inflaton may be identified with a singlet field in a see-saw model for neutrino masses, providing an efficient scenario for reheating and leptogenesis, (iv) supersymmetry breaking occurs with an arbitrary scale and a cosmological constant that vanishes before radiative corrections, (v) regions of the model parameter space are compatible with all LHC, Higgs and dark matter constraints.. arXiv:1310.4770; KCL-PH-TH-2013-33; LCTS-2013-22; CERN-PH-TH-2013-241; ACT-8-13; MIFPA-13-46; UMN-TH-3309-13; FTPI-MINN-13-38.- 2014 - 5 p. - Published in : Phys. Rev. D 89 (2014) 043502 External link: Preprint

2013-10-11
04:20
 Revisiting slepton pair production at the Large Hadron Collider / Fuks, Benjamin (CERN ; Strasbourg, IPHC) ; Klasen, Michael (Munster U., ITP) ; Lamprea, David R (Munster U., ITP) ; Rothering, Marcel (Munster U., ITP) Motivated by the shift in experimental attention towards electroweak supersymmetric particle production at the CERN LHC, we update in this paper our precision predictions at next-to-leading order of perturbative QCD matched to resummation at the next-to-leading logarithmic accuracy for direct slepton pair production in proton-proton collisions. Simplified models, now commonly adopted by the experimental collaborations for selectrons and smuons as well as mixing staus, are used as benchmarks for total cross sections at achieved and future center-of-mass energies. [...] arXiv:1310.2621; CERN-PH-TH-2013-240; MS-TP-13-35.- 2014 - 31 p. - Published in : J. High Energy Phys. 01 (2014) 168 External link: Preprint

2013-10-08
04:24
 Inflationary susceptibilities, duality and large-scale magnetic fields generation / Giovannini, Massimo (CERN ; INFN, Milan Bicocca) We investigate what can be said about the interaction of scalar fields with Abelian gauge fields during a quasi-de Sitter phase of expansion and under the assumption that the electric and the magnetic susceptibilities do not coincide. The duality symmetry, transforming the magnetic susceptibility into the inverse of the electric susceptibility, exchanges the magnetic and electric power spectra. [...] arXiv:1310.1802; CERN-PH-TH-2013-224.- 2013 - 29 p. - Published in : Phys. Rev. D 88 (2013) 083533 APS Published version, local copy: PDF; External link: Preprint

2013-10-03
04:19
 Polarized Parton Distributions at an Electron-Ion Collider / Ball, Richard D (Edinburgh U.) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Guffanti, Alberto (Bohr Inst.) ; Nocera, Emanuele R (Milan U. ; INFN, Milan) ; Ridolfi, Giovanni (Genoa U. ; INFN, Genoa) ; Rojo, Juan (CERN) /NNPDF Collaboration We study the potential impact of inclusive deep-inelastic scattering data from a future electron-ion collider (EIC) on longitudinally polarized parton distribution (PDFs). We perform a PDF determination using the NNPDF methodology, based on sets of deep-inelastic EIC pseudodata, for different realistic choices of the electron and proton beam energies. [...] arXiv:1310.0461; CERN-PH-TH-2013-210; EDINBURGH 2013-26; IFUM-1016-FT.- 2014 - 11 p. - Published in : Phys. Lett. B 728 (2014) 524-531 External link: Preprint

2013-09-23
15:40
 Production processes at extremely high energies / Gastmans, R (Leuven U.) ; (Wisconsin U., Madison) ; (CERN ; Harvard U.) The production processes are identified that contribute to the rise of the total cross section in proton-proton scattering at extremely high energies, s->~. At such energies, the scattering can be described by a black disk (completely absorptive) with a radius expanding logarithmically with energy surrounded by a gray fringe (partially absorptive). [...] CERN-PH-TH-2012-230.- 2013 - 5 p. - Published in : Phys. Lett. B 720 (2013) 205–209

2013-09-05
04:16
 Naive Dimensional Analysis Counting of Gauge Theory Amplitudes and Anomalous Dimensions / Jenkins, Elizabeth E (UC, San Diego) ; Manohar, Aneesh V (UC, San Diego) ; Trott, Michael (CERN) We show that naive dimensional analysis (NDA) is equivalent to the result that L-loop scattering amplitudes have perturbative order N=L+Delta, with a shift Delta that depends on the NDA-weight of operator insertions. The NDA weight of an operator is defined in this paper, and the general NDA formula for perturbative order N is derived. [...] arXiv:1309.0819; CERN-PH-TH-2013-213.- 2013 - 10 p. - Published in : Phys. Lett. B 726 (2013) 697-702 External link: Preprint

2013-08-29
06:19
 Cosmological Parameter Estimation with Large Scale Structure Observations / Di Dio, Enea (Geneva U., Dept. Theor. Phys.) ; Montanari, Francesco (Geneva U., Dept. Theor. Phys.) ; Durrer, Ruth (Geneva U., Dept. Theor. Phys.) ; Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) We estimate the sensitivity of future galaxy surveys to cosmological parameters, using the redshift dependent angular power spectra of galaxy number counts, $C_\ell(z_1,z_2)$, calculated with all relativistic corrections at first order in perturbation theory. We pay special attention to the redshift dependence of the non-linearity scale and present Fisher matrix forecasts for Euclid-like and DES-like galaxy surveys. [...] arXiv:1308.6186; LAPTH-037-13; CERN-PH-TH-2013-155.- 2014 - 25 p. - Published in : J. Cosmol. Astropart. Phys. 01 (2014) 042 External link: Preprint