Beyond the Standard Model

We introduce aspects of physics beyond the Standard Model focusing on supersymmetry, extra dimensions, and a composite Higgs as solutions to the Hierarchy problem. Lectures at the European School of High Energy Physics, Par\'adf\"urd\H{o}, Hungary, 5-18 June 2013.Comment: 119 pages, 16 figures, minor revisions and corrections from published version. Proceedings of the 2013 European School of High-Energy Physics, Paradfurdo, Hungary, 5-18 June 2013, edited by M. Mulders and G. Perez, CERN-2015-004 (CERN, Geneva, 2015), ISBN: 9789290834205. v2: typos corrected, references update

Radion Phenomenology in Realistic Warped Space Models

We investigate the phenomenology of the Randall-Sundrum radion in realistic models of electroweak symmetry breaking with bulk gauge and fermion fields, since the radion may turn out to be the lightest particle in such models. We calculate the coupling of the radion in such scenarios to bulk fermion and gauge modes. Special attention needs to be devoted to the coupling to massless gauge fields (photon, gluon), since it is well known that loop effects may be important for these fields. We also present a detailed explanation of these couplings from the CFT interpretation. We then use these couplings to determine the radion branching fractions and discuss some of the discovery potential of the LHC for the radion. We find that the gamma-gamma signal is enhanced over most of the range of the radion mass over the gamma-gamma signal of a SM Higgs, as long as the RS scale is sufficiently low. However, the signal significance depends strongly on free parameters that characterize the magnitude of bare brane-localized kinetic terms for the massless gauge fields. In the absence of such terms, the signal can be be enhanced over the traditional RS1 models (where all standard model fields are localized on the IR brane), but the signal can also be reduced compared to RS1 if the brane localized terms are sizeable. We also show that for larger radion masses, where the gamma-gamma signal is no longer significant, one can use the usual 4 lepton signal to discover the radion.Comment: 28 pages, 7 figure

Az európai integráció hatása a közép-kelet-európai országok mezőgazdaságára (The effect of European integration on agriculture in Central East European countries)

Az Európai Unió számos új lehetőséget kínált és új kihívást jelentett a 2004-ben és 2007-ben belépő 12 új tagország számára. A csatlakozás mezőgazdaságra gyakorolt hatása már a bővítést megelőzően is az egyik legtöbbet vitatott kérdés volt mind a régi tagországok, mind a tagjelöltek körében. A szerzők az új tagországok agrárgazdasági teljesítményei mögött meghúzódó tényezőket igyekeznek azonosítani a legfrissebb adatok és az eddigi tapasztalatok tükrében. Eredményeik szerint a csatlakozás alapvetően pozitív hatást gyakorolt a térség mezőgazdaságára, noha az egyes országok különböző módon éltek a csatlakozás kínálta lehetőségeikkel, ami a kezdeti adottságokkal, valamint a belépés előtti és utáni agrárpolitikájukkal magyarázható. A pozitív hatások mellett számos nehézség is felmerült - ezek közül az erős versenyben való helytállás nehézségei, illetve a kisgazdaságok hátrányos helyzete bizonyultak a leginkább meghatározónak

Mesino Oscillation in MFV SUSY

R-parity violating supersymmetry in a Minimal Flavor Violation paradigm can produce same-sign dilepton signals via direct sbottom-LSP pair production. Such signals arise when the sbottom hadronizes and the resulting mesino oscillates into an anti-mesino. The first bounds on the sbottom mass are placed in this scenario using current LHC results.Comment: 14 pages, 6 figure

Glueball mass spectrum from supergravity

We calculate the spectrum of glueball masses in non-supersymmetric Yang-Mills theory in three and four dimensions, based on a conjectured duality between supergravity and large N gauge theories. The glueball masses are obtained by solving supergravity wave equations in a black hole geometry. We find that the mass ratios are in good numerical agreement with the available lattice data. We also compute the leading (g^2_(YM)N)^(−1) corrections to the glueball masses, by taking into account stringy corrections to the supergravity action and to the black hole metric. We find that the corrections to the masses are negative and of order (g^2_(YM)N)^(−3/2). Thus for a fixed ultraviolet cutoff the masses decrease as we decrease the 't Hooft coupling, in accordance with our expectation about the continuum limit of the gauge theories

Composite Higgses

We present an overview of composite Higgs models in light of the discovery of the Higgs boson. The small value of the physical Higgs mass suggests that the Higgs quartic is likely loop generated, thus models with tree-level quartics will generically be more tuned. We classify the various models (including bona fide composite Higgs, little Higgs, holographic composite Higgs, twin Higgs and dilatonic Higgs) based on their predictions for the Higgs potential, review the basic ingredients of each of them, and quantify the amount of tuning needed, which is not negligible in any model. We explain the main ideas for generating flavor structure and the main mechanisms for protecting against large flavor violating effects, and present a summary of the various coset models that can result in realistic pseudo-Goldstone Higgses. We review the current experimental status of such models by discussing the electroweak precision, flavor and direct search bounds, and comment on UV completions and on ways to incorporate dark matter.Comment: 58 Pages, 5 Figures, 5 Tables. Invited review article accepted for publication in The European Physical Journal

Tree-level Quartic for a Holographic Composite Higgs

We present a new class of composite Higgs models where an adjustable tree-level Higgs quartic coupling allows for a significant reduction in the tuning of the Higgs potential. Our 5D warped space implementation is the first example of a holographic composite Higgs model with a tree-level quartic. It is inspired by a 6D model where the quartic originates from the Tr [A_5,A_6]^2 term of the gauge field strength, the same model that led to the original little Higgs construction of Arkani-Hamed, Cohen, and Georgi. Beyond the reduction of the tuning and the standard composite Higgs signatures, the model predicts a doubling of the KK states with relatively small splittings as well as a Higgs sector with two doublets in the decoupling limit.Comment: 22 pages, 4 figure