IFAE

About: IFAE is a other organization based out in Barcelona, Spain. It is known for research contribution in the topics: Large Hadron Collider & Galaxy. The organization has 664 authors who have published 1270 publications receiving 51097 citations. The organization is also known as: Instituto de Fisica de Altas Energias & IFAE.

Combined search for the Higgs boson with the D0 experiment

Abstract: We perform a combination of searches for standard model Higgs boson production in p (p) over bar collisions recorded by the D0 detector at the Fermilab Tevatron Collider at a center of mass energy of root s = 1.96 TeV. The different production and decay channels have been analyzed separately, with integrated luminosities of up to 9.7 fb(-1) and for Higgs boson masses 90 <= M-H <= 200 GeV. We combine these final states to achieve optimal sensitivity to the production of the Higgs boson. We also interpret the combination in terms of models with a fourth generation of fermions, and models with suppressed Higgs boson couplings to fermions. The result excludes a standard model Higgs boson at 95% C.L. in the ranges 90 < M-H < 101 GeV and 157 < M-H < 178 GeV, with an expected exclusion of 155 < M-H < 175 GeV. In the range 120 < M-H < 145 GeV, the data exhibit an excess over the expected background of up to 2 standard deviations, consistent with the presence of a standard model Higgs boson of mass 125 GeV.

Neutrino interaction classification with a convolutional neural network in the DUNE far detector

Abstract: The Deep Underground Neutrino Experiment is a next-generation neutrino oscillation experiment that aims to measure $CP$-violation in the neutrino sector as part of a wider physics program. A deep learning approach based on a convolutional neural network has been developed to provide highly efficient and pure selections of electron neutrino and muon neutrino charged-current interactions. The electron neutrino (antineutrino) selection efficiency peaks at 90% (94%) and exceeds 85% (90%) for reconstructed neutrino energies between 2-5 GeV. The muon neutrino (antineutrino) event selection is found to have a maximum efficiency of 96% (97%) and exceeds 90% (95%) efficiency for reconstructed neutrino energies above 2 GeV. When considering all electron neutrino and antineutrino interactions as signal, a selection purity of 90% is achieved. These event selections are critical to maximize the sensitivity of the experiment to $CP$-violating effects.

Predictions on the second-class current decays τ − → π − η ( ′ ) ν τ

Abstract: We analyze the second-class current decays ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{(\ensuremath{'})}{\ensuremath{ u}}_{\ensuremath{\tau}}$ in the framework of chiral perturbation theory with resonances. Taking into account ${\ensuremath{\pi}}^{0}\text{\ensuremath{-}}\ensuremath{\eta}\text{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ mixing, the ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{(\ensuremath{'})}$ vector form factor is extracted, in a model-independent way, using existing data on the ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ one. For the participant scalar form factor, we have considered different parametrizations ordered according to their increasing fulfillment of analyticity and unitarity constraints. We start with a Breit-Wigner parametrization dominated by the ${a}_{0}(980)$ scalar resonance and after we include its excited state, the ${a}_{0}(1450)$. We follow by an elastic dispersion relation representation through the Omn\`es integral. Then, we illustrate a method to derive a closed-form expression for the ${\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\eta}$, ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ (and ${K}^{\ensuremath{-}}{K}^{0}$) scalar form factors in a coupled-channels treatment. Finally, predictions for the branching ratios and spectra are discussed emphasizing the error analysis. An interesting result of this study is that both ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{(\ensuremath{'})}{\ensuremath{ u}}_{\ensuremath{\tau}}$ decay channels are promising for the soon discovery of second-class currents at Belle-II. We also predict the relevant observables for the partner ${\ensuremath{\eta}}_{\ensuremath{\ell}3}^{(\ensuremath{'})}$ decays, which are extremely suppressed in the Standard Model.