Tuesday, July 22
Location: LBNL, 54-130 Perseverance Hall – 2:00 p.m.
Speaker: Valeria Pershina (GSI, Darmstadt)
TITLE: “Relativistic Quantum Theory for Chemical Identification of the Heaviest Elements”
Wednesday, July 23
Location: LBNL – tba
Brown Bag Instrumentation Talk
Location: LBNL, 50A-5132 – noon (Bring your lunch!)
Speaker: Kevin O’Brien (LBNL)
Title: “Controlling and Detecting Coherent Acoustic Phonons with Plasmons”
Abstract: Due to their large absorption cross-sections and high sensitivity to refractive index changes, nanoplasmonic resonators can be used to generate and detect coherent acoustic phonons up to terahertz frequencies. By designing plasmonic nanostructures exhibiting multimodal phonon interference, we can detect the spatial properties of phonon modes below the optical wavelength through the interplay between plasmons and phonons. This allows detection of complex nanomechanical dynamics by polarization-resolved transient absorption spectroscopy.
Particle Theory Seminar
Location: LBNL, 50A-5132 – 2:00 p.m.
Speaker: Giovanni Ridolfi (INFN Genoa)
Title: “Approximate NNNLO Higgs cross section from analiticity and resummations”
Abstract: We construct an approximate expression for the cross section for Higgs production in gluon fusion at next-to-next-to-next-to-leading order in $\alpha_s$ ($\alpha_s^3$ relative to leading order) with finite top mass. We argue that an accurate approximation can be constructed by exploiting the analiticity of the cross section in the space of the complex variable $N$, Mellin conjugate to $m_H^2/s$, and the information on its singularity structure coming from large $N$ (soft gluon, Sudakov) and small $N$ (high energy, BFKL) all order resummation. We find that the approximate N$^3$LO result amounts to a correction of $17\%$ to the NNLO QCD cross section for production of a 125~GeV Higgs at the LHC (8~TeV), larger than previously estimated, and it significantly reduces the scale dependence of the NNLO result.
Location: LBNL, INPA Room 50-5026, 3:30 p.m. – Students are welcomed!
Speakers: *N.V. Karpenka, F. Feroz, M.P. Hobson, Testing the mutual consistency of different supernovae surveys, http://arxiv.org/abs/1407.5496 /
Teach-In: courtesy of Jakob Nordin and David Rubin on Hamiltonian Monte Carlo techniques & STAN (Bayesian inference and modeling)
Friday, July 25
Location: LBNL, 50-5026, 12 p.m.
Speaker: Christopher Grant (UC Davis)
Title: An experiment dedicated to addressing the challenges of neutrino science in liquid Argon TPCs
Abstract: The Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrinos (CAPTAIN) program is designed to make measurements of scientific importance to long-baseline neutrino physics and physics topics that will be explored by large underground detectors. To address the challenges facing future long-baseline neutrino detectors, the CAPTAIN collaboration is commissioning two liquid Argon time projections chambers (LArTPCs) and a liquid Argon well counter, all of which will be positioned in particle beams over the next few years. This talk will give an overview of the physics importance of the CAPTAIN program and outline the initial beam measurements that will be made by the CAPTAIN series of detectors. A more detailed outline will be presented of work performed at the Crocker Nuclear Laboratory 67 MeV proton cyclotron involving neutron-Argon cross-section measurements, an effort to constrain our understanding of backgrounds for supernova neutrino detection in liquid Argon.
Please check back in Fall 2014 when the regular seminar schedule will resume.