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http://hdl.handle.net/10261/49
Fri, 30 Jan 2015 03:18:30 GMT
20150130T03:18:30Z
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http://hdl.handle.net/10261/49

Finite theories before and after the discovery of a Higgs boson at the LHC
http://hdl.handle.net/10261/109250
Title: Finite theories before and after the discovery of a Higgs boson at the LHC
Authors: Heinemeyer, Sven; Mondragón, M.; Zoupanos, George
Abstract: Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified Theories (GUTs) which can be made finite to allloop orders, based on the principle of reduction of couplings, and therefore are provided with a large predictive power. Confronting the predictions of SU(5) FUTs with the top and bottom quark masses and other lowenergy experimental constraints a light Higgsboson mass in the range Mh ~ 121126 GeV was predicted, in striking agreement with the recent discovery of a Higgslike state around ~ 125.5 GeV at ATLAS and CMS. Furthermore the favoured model, a finiteness constrained version of the MSSM, naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above ~ 1.5 TeV, consistent with the nonobservation of those particles at the LHC. Restricting further the best FUT's parameter space according to the discovery of a Higgslike state and Bphysics observables we find predictions for the rest of the Higgs masses and the supersymmetric particle spectrum. The combination of results of Finite Unified Theories (FUT) based on SU(5) with the top and bottom quark masses and other lowenergy experimental constraints leads to the prediction of a light Higgsboson mass in the range 121126 GeV in striking agreement with the recent discovery of a Higgslike state around 125.5 GeV at ATLAS and CMS. The favoured model, a finiteness constrained version of the MSSM, naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above 1.5 TeV, consistent with the nonobservation of those particles at the LHC. Restricting the best FUT parameter space according to the discovery of a Higgslike state and Bphysics observables one finds predictions for the rest of the Higgs masses and the supersymmetric particle spectrum. Copyright © 2013 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim.
Mon, 12 Jan 2015 10:55:18 GMT
http://hdl.handle.net/10261/109250
20150112T10:55:18Z

The Baryon Oscillation Spectroscopic Survery Of SDSSIII
http://hdl.handle.net/10261/108519
Title: The Baryon Oscillation Spectroscopic Survery Of SDSSIII
Authors: Dawson, Kyle; GénovaSantos, Ricardo; PérezFournon, I.; Rebolo López, Rafael; RubinoMartin, J. A.; Scoccola, C. G.; Streblyanska, A.; Prada, Francisco; Mena, Olga
Abstract: The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the combined efforts of all previous spectroscopic surveys of largescale structure. BOSS uses 1.5 million luminous galaxies as faint as i = 19.9 over 10,000 deg(2) to measure BAO to redshifts z < 0.7. Observations of neutral hydrogen in the Ly alpha forest in more than 150,000 quasar spectra (g < 22) will constrain BAO over the redshift range 2.15 < z < 3.5. Early results from BOSS include the first detection of the largescale threedimensional clustering of the Ly alpha forest and a strong detection from the Data Release 9 data set of the BAO in the clustering of massive galaxies at an effective redshift z = 0.57. We project that BOSS will yield measurements of the angular diameter distance d(A) to an accuracy of 1.0% at redshifts z = 0.3 and z = 0.57 and measurements of H(z) to 1.8% and 1.7% at the same redshifts. Forecasts for Ly alpha forest constraints predict a measurement of an overall dilation factor that scales the highly degenerate DA(z) and H1(z) parameters to an accuracy of 1.9% at z similar to 2.5 when the survey is complete. Here, we provide an overview of the selection of spectroscopic targets, planning of observations, and analysis of data and data quality of BOSS
Tue, 09 Dec 2014 12:15:45 GMT
http://hdl.handle.net/10261/108519
20141209T12:15:45Z

Condensed matter realization of the axial magnetic effect
http://hdl.handle.net/10261/98797
Title: Condensed matter realization of the axial magnetic effect
Authors: Chernodub, Maxim N.; Cortijo, Alberto; Grushin, Adolfo G.; Landsteiner, Karl; Vozmediano, María A. H.
Abstract: The axial magneticeffect, i.e., the generation of an energy current parallel to an axial magnetic field coupling with opposite signs to left and righthanded fermions, is a nondissipative transport phenomenon intimately related to the gravitational contribution to the axial anomaly. An axial magnetic field emerges naturally in condensed matter in socalled Weyl semimetals. We present a measurable implementation of the axial magnetic effect. We show that the edge states of a Weyl semimetal at finite temperature possess a temperature dependent angular momentum in the direction of the vector potential intrinsic to the system. Such a realization provides a plausible context for the experimental confirmation of the elusive gravitational anomaly. © 2014 American Physical Society.
Tue, 24 Jun 2014 07:44:19 GMT
http://hdl.handle.net/10261/98797
20140624T07:44:19Z

Consistent highenergy constraints in the anomalous QCD sector
http://hdl.handle.net/10261/96667
Title: Consistent highenergy constraints in the anomalous QCD sector
Authors: Roig, Pablo; Sanz, Juan José
Abstract: The anomalous 〈VVP〉〈VVP〉 Green function and related formfactors (π0→γ⁎γ⁎π0→γ⁎γ⁎ and τ−→X−νττ−→X−ντ vector formfactors, with X−=(KKπ)−X−=(KKπ)−, φ−γφ−γ, (φV)−(φV)−) are analyzed in this letter in the largeNCNC limit. Within the single (vector and pseudoscalar) resonance approximation and the context of Resonance Chiral Theory, we show that all these observables overdetermine in a consistent way a unique set of compatible highenergy constraints for the resonance couplings. This result is in agreement with analogous relations found in the even intrinsicparity sector of QCD like, e.g., View the MathML sourceFV2=3F2. The antisymmetric tensor formalism is considered for the spinone resonance fields. Finally, we have also worked out and provide here the relation between the two bases of odd intrinsicparity Lagrangian operators commonly employed in the literature.
Wed, 14 May 2014 09:03:08 GMT
http://hdl.handle.net/10261/96667
20140514T09:03:08Z

Critical behavior of 3D Z(N)Z(N) lattice gauge theories at zero temperature
http://hdl.handle.net/10261/96611
Title: Critical behavior of 3D Z(N)Z(N) lattice gauge theories at zero temperature
Authors: Borisenko, O.; Chelnokov, V.; Cortese, G.; Gravina, M.; Papa, Anna; Surzhikov, I.
Abstract: Threedimensional Z(N)Z(N) lattice gauge theories at zero temperature are studied for various values of N . Using a modified phenomenological renormalization group, we explore the critical behavior of the generalized Z(N)Z(N) model for N=2,3,4,5,6,8N=2,3,4,5,6,8. Numerical computations are used to simulate vector models for N=2,3,4,5,6,8,13,20N=2,3,4,5,6,8,13,20 for lattices with linear extension up to L=96L=96. We locate the critical points of phase transitions and establish their scaling with N . The values of the critical indices indicate that the models with N>4N>4 belong to the universality class of the threedimensional XY model. However, the exponent α derived from the heat capacity is consistent with the Ising universality class. We discuss a possible resolution of this puzzle.
Tue, 13 May 2014 11:45:47 GMT
http://hdl.handle.net/10261/96611
20140513T11:45:47Z

A geometric Monte Carlo algorithm for the antiferromagnetic Ising model with “topological” term at θ=π
http://hdl.handle.net/10261/96603
Title: A geometric Monte Carlo algorithm for the antiferromagnetic Ising model with “topological” term at θ=π
Authors: Azcoitia, V.; Cortese, G.; Follana, E.; Giordano, Mara
Abstract: In this work we study the two and threedimensional antiferromagnetic Ising model with an imaginary magnetic field iθ at θ=πθ=π. In order to perform numerical simulations of the system we introduce a new geometric algorithm not affected by the sign problem. Our results for the 2D model are in agreement with the analytical solution. We also present new results for the 3D model which are qualitatively in agreement with meanfield predictions.
Tue, 13 May 2014 11:17:31 GMT
http://hdl.handle.net/10261/96603
20140513T11:17:31Z

Antisymmetric tensor Z p gauge symmetries in field theory and string theory
http://hdl.handle.net/10261/96598
Title: Antisymmetric tensor Z p gauge symmetries in field theory and string theory
Authors: BerasaluceGonzález, Mikel; Ramírez, G.; Uranga Urteaga, Ángel M.
Abstract: We consider discrete gauge symmetries in D dimensions arising as remnants of broken continuous gauge symmetries carried by general antisymmetric tensor fields, rather than by standard 1forms. The lagrangian for such a general Z p gauge theory can be described in terms of a rform gauge field made massive by a (r − 1)form, or other dual realizations, that we also discuss. The theory contains charged topological defects of different dimensionalities, generalizing the familiar charged particles and strings in D = 4. We describe realizations in string theory compactifications with torsion cycles, or with background field strength fluxes. We also provide examples of nonabelian discrete groups, for which the group elements are associated with charged objects of different dimensionality.
Description: BerasaluceGonzález, Mikel et al.
Tue, 13 May 2014 10:58:49 GMT
http://hdl.handle.net/10261/96598
20140513T10:58:49Z

Collider signatures of a light NMSSM pseudoscalar in neutralino decays in the light of LHC results
http://hdl.handle.net/10261/96567
Title: Collider signatures of a light NMSSM pseudoscalar in neutralino decays in the light of LHC results
Authors: Cerdeño, David G.; Ghosh, Pradipta; BeomPark, Chan; Peiró, Miguel
Abstract: We investigate signatures induced by a very light pseudoscalar Higgs in neutralino decays in the NexttoMinimal Supersymmetric Standard Model (NMSSM) and determine their observability at the LHC. We concentrate on scenarios which feature two light scalar Higgs bosons (one of them is SMlike with a mass of 125 GeV and a singletlike lighter one) with a very light (singletlike) pseudoscalar Higgs in the mass range 2m τ < ma01 < 2m b . We consider neutralinochargino pair production and the subsequent decay χ˜02,3→ χ˜01a01 , which leads to topologies involving multileptons and missing transverse energy. We determine a set of selection cuts that can effectively isolate the signal from backgrounds of the Standard Model or the Minimal Supersymmetric Standard Model. We also exemplify the procedure with a set of benchmark points, for which we compute the expected number of events and signal strength for LHC with 8 TeV center of mass energy. We show that this signal can already be probed for some points in the NMSSM parameter space.
Tue, 13 May 2014 09:22:11 GMT
http://hdl.handle.net/10261/96567
20140513T09:22:11Z

Holographic superfluids and the Landau criterion
http://hdl.handle.net/10261/96562
Title: Holographic superfluids and the Landau criterion
Authors: Amado, Irene; Areán, Daniel; Jiménez, A.; Landsteiner, Karl; Melgar, Luis; Salazar, I.
Abstract: We revisit the question of stability of holographic superfluids with finite superfluid velocity. Our method is based on applying the Landau criterion to the Quasinormal Mode (QNM) spectrum. In particular we study the QNMs related to the Goldstone modes of spontaneous symmetry breaking with linear and quadratic dispersions. In the linear case we show that the sound velocity becomes negative for large enough superfluid velocity and that the imaginary part of the quasinormal frequency moves to the upper half plane. Since the instability is strongest at finite wavelength, we take this as an indication for the existence of an inhomogeneous or striped condensed phase for large superfluid velocity. In the quadratic case the instability is present for arbitrarily small superfluid velocity.
Tue, 13 May 2014 09:13:01 GMT
http://hdl.handle.net/10261/96562
20140513T09:13:01Z

Sterile neutrinos in leptonic and semileptonic decays
http://hdl.handle.net/10261/96559
Title: Sterile neutrinos in leptonic and semileptonic decays
Authors: Abada, Asmaa; Teixeira, A. M.; Vicente, Avelino; Weiland, Carlos
Abstract: We address the impact of a modified W ℓν coupling on a wide range of observables, such as τ leptonic and mesonic decays, leptonic decays of pseudoscalar mesons, as well as semileptonic meson decays. In particular, we concentrate on deviations from lepton flavour universality, focusing on the ratios R P = Γ(P → ℓν)/Γ(P → ℓ′ν), with P = K,π,D,D s , R(D) = Γ(B + → Dτ + ν)/Γ(B + → Dℓ + ν), R τ = Γ(τ → μνν)/Γ(τ → eνν), RℓτP = Γ(τ → Pν)/Γ(P → ℓν), and BR(B → τν). We further consider leptonic gauge boson decays, such as W → ℓν and Z → νν. For all the above observables, we provide the corresponding complete analytical expressions, derived for the case of massive neutrinos. Working in the framework of the Standard Model extended by additional sterile fermions, which mix with the active (lefthanded) neutrinos, we numerically study the impact of activesterile mixings on the above mentioned observables.
Tue, 13 May 2014 09:03:39 GMT
http://hdl.handle.net/10261/96559
20140513T09:03:39Z