CERN Accelerating science

TH Articles

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2014-11-25
12:23
New Higgs Inflation in a No-Scale Supersymmetric SU(5) GUT / Ellis, John (Trinity Coll., Dublin ; CERN) ; He, Hong-Jian (Tsinghua U., Beijing, CHEP ; Peking U., CHEP) ; Xianyu, Zhong-Zhi (Tsinghua U., Beijing, CHEP ; Peking U., CHEP)
Higgs inflation is attractive because it identifies the inflaton with the electroweak Higgs boson. In this work, we construct a new class of supersymmetric Higgs inflationary models in the no-scale supergravity with an SU(5) GUT group. [...]
arXiv:1411.5537; KCL-PH-TH-2014-48; LCTS-2014-49; CERN-PH-TH-2014-230.- 2015 - Published in : Phys. Rev. D 91 (2015) 021302 Fulltext: PDF; External link: Preprint

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2014-11-19
09:34
On the two-loop corrections to the Higgs masses in the NMSSM / Goodsell, Mark D (Paris U., VI-VII ; Paris, LPTHE) ; Nickel, Kilian (Bonn U.) ; Staub, Florian (CERN)
We discuss the impact of the two-loop corrections to the Higgs mass in the NMSSM beyond $O(\alpha_S(\alpha_b + \alpha_t))$. For this purpose we use the combination of the public tools SARAH and SPheno to include all contributions stemming from superpotential parameters. [...]
arXiv:1411.4665; BONN-TH-2014-16; CERN-PH-TH-2014-231.- 2015 - 23 p. - Published in : Phys. Rev. D 91 (2015) 035021 Fulltext: PDF; External link: Preprint

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2014-11-13
07:52
Nonlinear evolution of density and flow perturbations on a Bjorken background / Brouzakis, Nikolaos (Athens U.) ; Floerchinger, Stefan (CERN) ; Tetradis, Nikolaos (Athens U. ; CERN) ; Wiedemann, Urs Achim (CERN)
Density perturbations and their dynamic evolution from early to late times can be used for an improved understanding of interesting physical phenomena both in cosmology and in the context of heavy-ion collisions. We discuss the spectrum and bispectrum of these perturbations around a longitudinally expanding fireball after a heavy-ion collision. [...]
arXiv:1411.2912; CERN-PH-TH-2014-223.- 2015 - 30 p. - Published in : Phys. Rev. D 91 (2015) 065007 Fulltext: PDF; External link: Preprint

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2014-11-13
07:49
Accelerating cosmological expansion from shear and bulk viscosity / Floerchinger, Stefan (CERN) ; Tetradis, Nikolaos (Athens U. ; CERN) ; Wiedemann, Urs Achim (CERN)
The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein's field equations. We show how this backreaction effect depends on shear and bulk viscosity and other material properties of the dark sector, as well as the spectrum of perturbations. [...]
arXiv:1411.3280; CERN-PH-TH-2014-224.- 2015 - 5 p. - Published in : Phys. Rev. Lett. 114 (2015) 091301 Fulltext: PDF; External link: Preprint

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2014-11-06
08:31
Approach to equilibrium in weakly coupled nonabelian plasmas / Kurkela, Aleksi (CERN) ; Lu, Egang (McGill U.)
We follow the time evolution of nonabelian gauge bosons from far-from-equilibrium initial conditions to thermal equilibrium by numerically solving an effective kinetic equation that becomes accurate in the weak coupling limit. We consider initial conditions that are either highly overoccupied or underoccupied. [...]
arXiv:1405.6318; CERN-PH-TH-2014-093.- 2014 - 6 p. - Published in : Phys. Rev. Lett. 113 (2014) 182301 APS published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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2014-11-04
07:37
TEK twisted gradient flow running coupling / Pérez, Margarita García (Madrid, Autonoma U. ; Madrid, IFT) ; González-Arroyo, Antonio (Madrid, IFT ; Madrid, Autonoma U.) ; Keegan, Liam (CERN) ; Okawa, Masanori (Hiroshima U. (main))
We measure the running of the twisted gradient flow coupling in the Twisted Eguchi-Kawai (TEK) model, the SU(N) gauge theory on a single site lattice with twisted boundary conditions in the large N limit..
arXiv:1411.0258; CERN-PH-TH-2014-210; IFT-UAM-CSIC-14-114; HUPD-1409; FTUAM-14-47.- 2014 - 7 p. Fulltext: PDF; External link: Preprint

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2014-10-20
08:00
Exploring CP Violation in the MSSM / Arbey, A (CERN ; Lyon U. ; Lyon Observ. ; Lyon, Ecole Normale Superieure) ; Ellis, J (CERN ; King's Coll. London) ; Godbole, R M (Bangalore, Indian Inst. Sci.) ; Mahmoudi, F (CERN ; IUF, Paris ; Lyon U. ; Lyon Observ. ; Lyon, Ecole Normale Superieure)
We explore the prospects for observing CP violation in the minimal supersymmetric extension of the Standard Model (MSSM) with six CP-violating parameters, three gaugino mass phases and three phases in trilinear soft supersymmetry-breaking parameters, using the CPsuperH code combined with a geometric approach to maximize CP-violating observables subject to the experimental upper bounds on electric dipole moments. We also implement CP-conserving constraints from Higgs physics, flavour physics and the upper limits on the cosmological dark matter density and spin-independent scattering. [...]
arXiv:1410.4824; KCL-PH-TH-2014-40; LCTS-2014-40; CERN-PH-TH-2014-195.- 2015 - 36 p. - Published in : Eur. Phys. J. C 75 (2015) 85 Fulltext: PDF; External link: Preprint

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2014-10-17
07:43
Global fits to b -> s ll data and signs for lepton non-universality / Hurth, T (U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Mahmoudi, F (CERN ; IUF, Paris ; Lyon U. ; Lyon Observ. ; Lyon, Ecole Normale Superieure) ; Neshatpour, S (IPM, Tehran)
There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred. [...]
arXiv:1410.4545; CERN-PH-TH-2014-198; MITP-14-078.- 2014 - 15 p. - Published in : J. High Energy Phys. 12 (2014) 053 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:59
Lattice gauge theory without link variables / Vairinhos, Helvio (Zurich, ETH ; Porto U.) ; de Forcrand, Philippe (Zurich, ETH ; CERN)
We obtain a sequence of alternative representations for the partition function of pure SU(N) or U(N) lattice gauge theory with the Wilson plaquette action, using the method of Hubbard-Stratonovich transformations. In particular, we are able to integrate out all the link variables exactly, and recast the partition function of lattice gauge theory as a Gaussian integral over auxiliary fields..
arXiv:1409.8442; CERN-PH-TH-2014-186.- 2014 - 5 p. - Published in : J. High Energy Phys. 12 (2014) 038 Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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2014-10-02
07:56
Natural Braneworld Inflation in Light of Recent Results from Planck and BICEP2 / Neupane, Ishwaree P (CERN ; Canterbury U. ; Tribhuvan U., Kathmandu)
In this paper we report on a major theoretical observation in cosmology. We present a concrete cosmological model for which inflation has natural beginning and natural ending. [...]
arXiv:1409.8647; CERN-PH-TH-2014-189.- 2014 - 22 p. - Published in : Phys. Rev. D 90 (2014) 123502 Fulltext: PDF; External link: Preprint

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