Search for anomalous gauge couplings in semi-leptonic decays of WWγWW\gamma and WZγWZ\gamma in pp collisions at s=\sqrt{s} = 8 TeV

A study of the Standard Model (SM) three electroweak boson production, $WV\gamma$ where V = W or Z gauge boson, is presented concerning events with a leptonically decaying W boson accompanied by a photon and two or more jets. We are using the full 2012 dataset, of proton-proton collisions at a center-of-mass energy of 8 TeV and an integrated luminosity of 19.3 fb${}^{-1}$, collected by the CMS detector at the Large Hadron Collider (LHC). $WV\gamma$ production final states may be sensitive to anomalous $WW\gamma\gamma$ and $WWZ\gamma$ quartic couplings. In light of the recent discovery of a Higgs-like particle, we investigate, in a model independent way, any deviation of gauge boson couplings with respect to the SM prediction by setting limits on the anomalous quartic gauge couplings (aQGC) for $WW\gamma\gamma$ and $WWZ\gamma$. Upper limits at 95% confidence level are obtained, with and without a form factor.Comment: "Presentation at the DPF 2013 Meeting of the American Physical Society Division of Particles and Fields, Santa Cruz, California, August 13-17, 2013.

The optimal price of money

The optimal inflation tax is computed in monetary models where money is costly to supply. The models are simple general equilibrium models with money in the utility function or a transactions technology. The inflation tax is a means of raising taxes to finance exogenous government expenditures. The alternative means of revenue are also distortionary. The main point of this article is to show that the robustness of the optimality of the Friedman rule, of a zero nominal interest rate, resides in the assumption that money is produced at zero cost.Money ; Interest rates ; Inflation (Finance)

Prospects for γγ→H\gamma \gamma \to H and γγ→W+W−\gamma \gamma \to W^{+}W^{-} measurements at the FCC-ee

We study the possibilities for the measurement of two-photon production of the Higgs boson (in the $b \bar{b}$ decay channel), and of $W^{+}W^{-}$ pairs (decaying into four jets) in $e^{+}e^{-}$ collisions at the the Future Circular Collider (FCC-ee). The processes are simulated with the PYTHIA and MADGRAPH 5 Monte Carlo codes, using the effective photon approximation for the $e^{+}e^{-}$ photon fluxes, at center-of-mass energies $\sqrt{s} =$ 160 GeV and 240 GeV. The analyses include electron-positron tagging, realistic acceptance and reconstruction efficiencies for the final-state jets, and selection criteria to remove the backgrounds. Observation of both channels is achievable with the expected few ab$^{-1}$ integrated luminosities at FCC-ee.Comment: Proceedings of the conference PHOTON 2015: International Conference on the Structure and the Interactions of the Photon including the 21th International Workshop on Photon-Photon Collisions and the International Workshop on High Energy Photon Colliders, held at Budker Institute of Nuclear Physics (BINP), Siberian Branch of Russian Academy of Science, Novosibirsk, Russia, from 15 to 19 June, 201

The optimal inflation tax

We determine the second best rule for the inflation tax in monetary general equilibrium models where money is dominated in rate of return. The results in the literature are ambiguous and inconsistent across different monetary environments. We compare the derived optimal inflation tax solutions across the different environments and find that Friedman's policy recommendation of a zero nominal interest rate is the right one.Inflation (Finance) ; Taxation

A stable money demand: Looking for the right monetary aggregate

A money demand relationship with M1 as the monetary aggregate holds very well until the mid-1980s but not well after that. This could be because the demand for money is not a stable relationship. The authors' conclusion is that the measure of money is not a stable measure. Technological innovation and changes in regulatory practices in the past two decades have made other monetary aggregates as liquid as M1. Once an appropriately adjusted measure of money is taken into consideration, the stability of money demand is recovered.Money ; Money supply

Universal Algebra of a Hom-Lie Algebra and group-like elements

We construct the universal enveloping algebra of a Hom-Lie algebra and endow it with a Hom-Hopf algebra structure. We discuss group-like elements that we see as a Hom-group integrating the initial Hom-Lie algebra

Collisionless relaxation in non-neutral plasmas

A theoretical framework is presented which allows to quantitatively predict the final stationary state achieved by a non-neutral plasma during a process of collisionless relaxation. As a specific application, the theory is used to study relaxation of charged-particles beams. It is shown that a fully matched beam relaxes to the Lynden-Bell distribution. However, when a mismatch is present and the beam oscillates, parametric resonances lead to a core-halo phase separation. The approach developed accounts for both the density and the velocity distributions in the final stationary state.Comment: Accepted in Phys. Rev. Let

Sharpening the shape analysis for higher-dimensional operator searches

When the Standard Model is interpreted as the renormalizable sector of a low-energy effective theory, the effects of new physics are encoded into a set of higher dimensional operators. These operators potentially deform the shapes of Standard Model differential distributions of final states observable at colliders. We describe a simple and systematic method to obtain optimal estimations of these deformations when using numerical tools, like Monte Carlo simulations. A crucial aspect of this method is minimization of the estimation uncertainty: we demonstrate how the operator coefficients have to be set in the simulations in order to get optimal results. The uncertainty on the interference term turns out to be the most difficult to control and grows very quickly when the interference is suppressed. We exemplify our method by computing the deformations induced by the ${\cal O}_{3W}$ operator in $W^+W^-$ production at the LHC, and by deriving a bound on ${\cal O}_{3W}$ using $8$ TeV CMS data.Comment: 21 pages, 4 figures. v2: Minor corrections, references added, matches journal versio