2014-02-04
04:16 |
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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 |
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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 |
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2013-10-28
04:12 |
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