Now showing items 306-325 of 1383

• #### Evidence for the direct decay of the 125 GeV Higgs boson to fermions ﻿

(2014)
The discovery of a new boson with a mass of approximately 125 GeV in 2012 at the Large Hadron Collider [1, 2, 3] has heralded a new era in understanding the nature of electroweak symmetry breaking and possibly completing ...
• #### Evidence for transverse-momentum- and pseudorapidity-dependent event-plane fluctuations in PbPb and $p\mathrm{Pb}$ collisions ﻿

(2015)
A systematic study of the factorization of long-range azimuthal two-particle correlations into a product of single-particle anisotropies is presented as a function of pT and η of both particles and as a function of the ...
• #### Evidence of b-Jet Quenching in PbPb Collisions at √sNN=2.76  TeV ﻿

(2014)
The production of jets associated to bottom quarks is measured for the first time in PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair. Jet spectra are reported in the transverse momentum (pT) range ...
• #### Evidence of Bose-Einstein Condensation in an Atomic Gas with Attractive Interactions ﻿

(1995)
Evidence for Bose-Einstein condensation of a gas of spin-polarized 7Li atoms is reported. Atoms confined to a permanent-magnet trap are laser cooled to 200 μK and are then evaporatively cooled to lower temperatures. ...
• #### Evolution of atomic motion in an intense standing wave ﻿

(1993)
We have investigated the effect of the dipole force and its fluctuation on the motion of Li atoms in an intense, one-dimensional, near-resonant standing light wave. The duration of the interaction of the atoms with the ...
• #### Evolution of light-induced vapor generation at a liquid-immersed metallic nanoparticle ﻿

(2013)
When an Au nanoparticle in a liquid medium is illuminated with resonant light of sufficient intensity, a nanometer scale envelope of vapor -a “nanobubble”- surrounding the particle, is formed. This is the nanoscale onset ...
• #### Evolution of London penetration depth with scattering in single crystals of K1−xNaxFe2As2 ﻿

(2014)
London penetration depth, λ(T), was measured in single crystals of K1−xNaxFe2As2, x=0 and 0.07, down to temperatures of 50 mK, ∼Tc/50. Isovalent substitution of Na for K significantly increases impurity scattering, ...
• #### Evolutionary processes in finite populations ﻿

(2013)
We consider the evolution of large but finite populations on arbitrary fitness landscapes. We describe the evolutionary process by a Markov-Moran process.We show that toO(1/N), the time-averaged fitness is lower for the ...
• #### Excess noise in STM-style break junctions at room temperature ﻿

(2012)
Current noise in nanoscale systems provides additional information beyond the electronic conductance. We report measurements at room temperature of the nonequilibrium ﾓexcessﾔ noise in ensembles of atomic-scale gold junctions ...
• #### Excited electronic states from a variational approach based on symmetry-projected Hartree–Fock configurations ﻿

(2013)
Recent work from our research group has demonstrated that symmetry-projected Hartree–Fock (HF) methods provide a compact representation of molecular ground state wavefunctions based on a superposition of non-orthogonal ...
• #### Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla ﻿

(2016)
In bulk and quantum-confined semiconductors, magneto-optical studies have historically played an essential role in determining the fundamental parameters of excitons (size, binding energy, spin, dimensionality and so on). ...
• #### Exclusive γγ → μ + μ − production in proton-proton collisions at √s=7 TeV ﻿

(2012)
A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at s√=7 TeV, pp → pμ + μ −p, is reported using data corresponding to an integrated luminosity of 40 pb−1. For muon pairs with ...
• #### Experimental Measurement of Self-Diffusion in a Strongly Coupled Plasma ﻿

(2016)
We present a study of the collisional relaxation of ion velocities in a strongly coupled, ultracold neutral plasma on short time scales compared to the inverse collision rate. The measured average velocity of a tagged ...
• #### Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors ﻿

(2015)
The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron ...
• #### Experimental Realization of an Exact Solution to the Vlasov Equations for an Expanding Plasma ﻿

(2007-10-08)
• #### Experimental studies of di-jets in Au + Au collisions using angular correlations with respect to back-to-back leading hadrons ﻿

(2013)
Jet-medium interactions are studied via a multihadron correlation technique (called “2+1”), where a pair of back-to-back hadron triggers with large transverse momentum is used as a proxy for a di-jet. This work extends the ...
• #### Exploring the free energy landscape of nucleosome assembly ﻿

(2016)
The nucleosome is the fundamental unit for packaging the genome. A detailed molecular picture for its conformational dynamics is crucial for understanding transcription and gene regulation. We investigate the disassembly ...
• #### Extraordinary sensitivity enhancement by metasurfaces in terahertz detection of antibiotics ﻿

(2015)
We have detected trace amounts of molecules of antibiotics (kanamycin sulfate) dispersed on metasurfaces with terahertz (THz) spectroscopy. Utilizing the extraordinary optical transmission resonance of an array of square-shaped ...
• #### Extreme Tunability of Interactions in a Li7 Bose-Einstein Condensate ﻿

(2009)
We use a Feshbach resonance to tune the scattering length a of a Bose-Einstein condensate of Li7 in the |F=1,mF=1⟩ state. Using the spatial extent of the trapped condensate, we extract a over a range spanning 7 decades ...
• #### Facile Synthesis and Catalysis of Pure-Silica and Heteroatom LTA ﻿

(2015)
Zeolite A (LTA) has many large-scale uses in separations and ion exchange applications. Because of the high aluminum content and lack of high-temperature stability, applications in catalysis, while highly desired, have ...