CERN Accelerating science

TH Articles

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2014-02-04
04:16
Scaling laws and sum rules for the B-mode polarization / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
The formation of the microwave background polarization anisotropies is investigated when the stochastic Faraday rate is stationary, random and Markovian. The scaling properties of the polarization power spectra and of their nonlinear combinations are scrutinized as a function of the comoving frequency. [...]
arXiv:1402.0394; CERN-PH-TH-2014-015.- 2014 - 9 p. - Published in : Phys. Rev. D 89 (2014) 061301 External link: Preprint

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2014-01-30
08:28
Higgs pair production at the LHC with NLO and parton-shower effects / Frederix, R (CERN) ; Frixione, S (CERN) ; Hirschi, V (SLAC) ; Maltoni, F (Louvain U., CP3) ; Mattelaer, O (Louvain U., CP3) ; Torrielli, P (Zurich U.) ; Vryonidou, E (Louvain U., CP3) ; Zaro, M (Paris U., IV ; Paris, LPTHE)
We present predictions for the SM-Higgs-pair production channels of relevance at the LHC: gluon-gluon fusion, VBF, and top-pair, W, Z and single-top associated production. All these results are at the NLO accuracy in QCD, and matched to parton showers by means of the MC@NLO method; hence, they are fully differential. [...]
arXiv:1401.7340; CERN-PH-TH-2014-014; CP3-14-07; ZU-TH03-14; LPN14-055.- 2014 - 11 p. - Published in : Phys. Lett. B 732 (2014) 142-149 Elsevier Open Access article: PDF; External link: Preprint

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2014-01-23
10:52
Energy-energy correlations in N=4 Supersymmetric Yang-Mills Theory / Belitsky, A V (Arizona State U.) ; Hohenegger, S (CERN) ; Korchemsky, G P (Saclay, SPhT) ; Sokatchev, E (CERN ; Annecy, LAPTH ; Inst. U. de France) ; Zhiboedov, A (Princeton U.)
We present a new approach to computing energy-energy correlations in gauge theories that exploits their relation to correlation functions and bypasses the use of scattering amplitudes. We illustrate its power by calculating energy-energy correlations in the maximally supersymmetric Yang-Mills theory (N=4 SYM) in the next-to-leading order approximation..
arXiv:1311.6800; CERN-PH-TH-2013-282; LAPTH-069-13; IPhT-13-264.- 2014 - 5 p. - Published in : Phys. Rev. Lett. 112 (2014) 071601 APS published version, local copy: PDF; External link: Preprint

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2013-12-18
04:25
No-hair conjectures, primordial shear and protoinflationary initial conditions / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
Anisotropic inflationary background geometries are analyzed in the context of an extended gauge action where the electric and magnetic susceptibilities are not bound to coincide and depend on the inflaton field. After deriving various classes of solutions with electric and magnetic hairs, we discuss the problem of the initial boundary conditions of the shear parameter and consider a globally neutral plasma as a possible relic of a preinflationary stage of expansion. [...]
arXiv:1312.4832; CERN-PH-TH-2013-300.- 2014 - 29 p. - Published in : Phys. Rev. D 89 (2014) 063512 External link: Preprint

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2013-12-06
04:23
Rescuing Quadratic Inflation / Ellis, John (King's Coll. London) ; Fairbairn, Malcolm (King's Coll. London) ; Sueiro, Maria (King's Coll. London)
Inflationary models based on a single scalar field $\phi$ with a quadratic potential $V = \frac{1}{2} m^2 \phi^2$ are disfavoured by the recent Planck constraints on the scalar index, $n_s$, and the tensor-to-scalar ratio for cosmological density perturbations, $r_T$. In this paper we study how such a quadratic inflationary model can be rescued by postulating additional fields with quadratic potentials, such as might occur in sneutrino models, which might serve as either curvatons or supplementary inflatons. [...]
arXiv:1312.1353; KCL-PH-TH-2013-40; LCTS-2013-27; CERN-PH-TH-2013-293.- 2014 - 17 p. - Published in : J. Cosmol. Astropart. Phys. 02 (2014) 044 External link: Preprint

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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

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2013-11-27
04:22
Study of the 125 GeV Standard Model Higgs Boson Partial Widths and Branching Fractions / Almeida, Leandro G (Orsay, LPT) ; Lee, Seung J (KAIST, Taejon ; KAIST, Seoul) ; Pokorski, Stefan (Warsaw U.) ; Wells, James D (CERN)
The discovery of the Higgs boson, with mass known to better than the percent level, enables for the first time precision Higgs boson analyses. Toward this goal, we define an expansion formalism of the Higgs boson partial widths and branching fractions that facilitates such studies. [...]
arXiv:1311.6721; CERN-PH-TH-2013-285.- 2014 - 16 p. - Published in : Phys. Rev. D 89 (2014) 033006 External link: Preprint

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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

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2013-11-04
11:11
JEWEL 2.0.0 - Directions for Use / Zapp, Korinna C (CERN)
In this publication the first official release of the JEWEL 2.0.0 code is presented. JEWEL is a Monte Carlo event generator simulating QCD jet evolution in heavy-ion collisions. [...]
arXiv:1311.0048; CERN-PH-TH-2013-255; MCNET-13-17.- 2014 - 17 p. - Published in : Eur. Phys. J. C 74 (2014) 2762 Springer Open Access article: PDF; External link: Preprint

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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

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