Higuera Abstract

MINERvA is measuring muon neutrino charged current coherent pion production on Carbon for 1.5 GeV < E_nu < 20 GeV. This measurement uses MINERvA's capability to reconstruct |t|= (q-p_pi)^2 event-by-event to select a low-|t| coherent-rich sample. Our measurements of sigma(E_nu), dsigma/dE_pi, and dsigma/dTheta_pi show deviations from the GENIE neutrino event generator that uses Rein-Sehgal model as input.

Haesler Abstract

Neutrino flux prediction uncertainty is an important contribution to the systematics of current long-baseline experiments for the study of neutrino oscillations. In
addition, a precise knowledge of the flux is also mandatory for studies of neutrino cross sections. The NA61/SHINE experiment at the CERN SPS has conducted a hadron production measurement program to deliver high quality data to the T2K experiment. Detailed measurements of interactions of a proton beam with a thin carbon target as well as a T2K replica target have been performed to constrain the T2K neutrino flux prediction.

The current method applied in the T2K experiment to reduce uncertainties on the flux predictions is based on re-weighting of hadron cross sections in the interaction vertices. As an input, this method uses data for 31 GeV/c protons on thin carbon target (4%λ_I) measured by NA61/SHINE. This allows to constrain ∼60% of the neutrino flux. Measurements of the hadrons exiting from the surface of the T2K replica target (1.9 λ_I) should allow to constrain up to 90% of the flux. These measurements are the ultimate goal in order to achieve precise neutrino flux predictions.

In this seminar we present recent results obtained by NA61/SHINE on hadron production measurements for T2K and review the importance of replica target measurements. A detailed explanation of the T2K replica target analysis will be covered. The implementation of these data in the T2K neutrino flux prediction will be discussed.

Witzel Abstract

We determine B-meson decay constants, B → π l ν and B_s → K l ν form factors using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks. Results are presented with full error budget and obtained at two lattice spacings (a ~ 0.11 fm and 0.08 fm) using RBC-UKQCD's 2+1 flavor domain-wall Iwasaki gauge field configurations. Our results are in agreement with existing results in the literature and provide important and independent cross-checks.

Fodor Abstract

The existence and stability of atoms relies on the fact that neutrons are more massive than protons. The mass difference is only 0.14% of the average. This tiny mass splitting has significant astrophysical and cosmological implications. A slightly smaller or larger value would have led to a dramatically different universe. Here we show, how this difference results from the competition between electromagnetic and mass isospin breaking effects. We compute the neutron-proton mass splitting and show that it is greater than zero by five standard deviations. Furthermore, splittings in the Sigma, Xi, D and Xi_cc isospin multiplets are determined providing also predictions. We perform lattice Quantum-Chromodynamics plus Quantum-Electrodynamics computations with four, non-degenerate Wilson fermion flavors. Four lattice spacings and pion masses down to 195 MeV are used.

Friend Abstract

The T2K long-baseline neutrino experiment has recently released several new and exciting results and has implemented a new analysis method which simultaneously fits the full T2K dataset of ν_μ → ν_e appearance and ν_μ → ν_μ disappearance. The precise T2K constraints on the four relevant oscillation parameters (sin²2θ₁₃, δ_CP, sin²θ₂₃, and Δm²₃₂) are all correctly accounted for in this fit. Following the exciting new measurements by T2K and precise measurements of sin²2θ₁₃ by reactor experiments, the projected sensitivity of the T2K experiment at the proposed full statistics has also been updated, and these new sensitivities will be discussed, including a potential sensitivity to CP violation in the neutrino sector.

Nagai Abstract

Since the discovery of a new boson at the LHC in July 2012, the ATLAS and CMS experiments measure its properties in the bosonic decay modes of the new boson. Measured properties are consistent with the Standard Model Higgs boson, however, it is also very important to verify whether this new boson decays into fermions as predicted by the Standard Model.

In this seminar, we will report the latest results on a search for the Standard Model Higgs boson decaying to a b-quark pair in associated (W/Z)H production with the full Run1 dataset collected by the ATLAS detector. We will first review the experimental setups and discuss analysis details.Then, we will present the results of the analysis. Finally, we will discuss the prospects of this analysis for the upcoming high luminosity LHC.

Bantilan Abstract

The collision of black holes is a classic problem in the strong-field regime of general relativity, with no known closed-form solution. When exact solutions are not known, or perturbative expansions about known solutions are inadequate to capture the non-linear dynamics, the numerical solution of the Einstein field equations is required. The main purpose of this talk is to describe, in detail, the necessary ingredients for achieving stable Cauchy evolution of black hole collisions in asymptotically anti-de Sitter (AdS) spacetimes. I will begin by motivating this program in terms of the heavy-ion physics it is intended to clarify. I will then give an overview of anti-de Sitter space, the mapping to its dual boundary conformal field theory, and the method we use to numerically solve the fully non-linear Einstein field equations with AdS boundary conditions. As a concrete example of these ideas, I will describe the first proof of principle simulation of stable AdS black hole mergers in 5 dimensions.

Gurarie Abstract

Topological states of matter are a rapidly developing area of research in condensed matter physics. Beginning from quantum Hall effect in the 80s-90s, and continuing with topological insulators a decade later, this field of study is now full of theoretical models with anticipated exotic behavior which await their experimental discovery and observation. After a brief introduction into this field, I will describe my work to study topological states of matter with a certain class of topological invariants first proposed in the context of topological insulators and now generalized to include potentially all topological states. I will also discuss the proposed relationship between these invariants and the non-dissipative viscosity, a quantity originally known from the study of plasmas in a magnetic field which more recently received attention in the context of quantum Hall effect.