High-energy physics

Coherent Charged Pion Production at MINERvA

This seminar has been rescheduled for Monday, Nov. 23, 11 a.m., Bldg. 362, Rm. F108.

Neutrino-induced coherent charged pion production on nuclei is a rare, inelastic interaction that produces a charged lepton and pion in the forward direction while leaving the nucleus intact. Understanding this process at few GeV neutrino energy is important for precision measurements of neutrino oscillation parameters.

Covariant Derivative Expansion: Generic Calculation of SM EFT Wilson Coefficient at One Loop Level

In this talk I will show a novel calculation tool based on the covariant derivative expansions of the Coleman-Weinberg potential, which can match an arbitrary UV theory to the pure bosonic SM operator set. This method has advantage of getting all the operators simultaneously, being universal for specific models, and always giving analytical results. The matching has been generalized to fermionic models, and nondegenerated large scales.

Now Pentaquarks, What Next

With the discovery of a charmed pentaquark, the LHCb Collaboration has shown that a new configuration of four quarks plus one antiquark can exist as a short-lived particle. But not any combination of quarks will do this, as this case containing both a charm and an anticharm quark is the only pentaquark yet known.

New Developments for Scattering Amplitudes

In this talk I will discuss two branches of scattering amplitudes which have seen major developments in recent years. Firstly I will elaborate on Integrand Reduction techniques for multi-loop integrals and how they can be applied to the Color-Kinematic duality and secondly how these integrals can be computed by the method of differential equations, which recently has been stimulated by new ideas. I will conclude each part by a series of examples where these techniques have been applied.

Interpreting Cosmic Ray Signals Energy-peak Way

It has been shown that the energy distribution of the massless decay product from the 2-body decay of a scalar or unpolarized mother particle has a peak, whose location is identical to the fixed energy of that particle in the rest frame of the corresponding mother particle although its underlying boost distribution is unknown.

The REDTOP Project: Rare Eta Decays with a Tpc for Optical Photons

The eta meson is almost unique in the particle universe since it is a Goldstone boson and the dynamic of its decay is strongly constrained. The fact that the eta has no charges will expose any decay violating a conservation law without interfering with a corresponding current. The integrated eta meson samples collected by various experiments in the past is of the order of events, limiting considerably the search for such rare decays.

Muon Engineering

This talk will discuss ways that muons observed in neutrino experiments can be used to probe a myriad of other regimes of physics; such as climate studies, neutrino oscillations, associated production of strangeness, neutrino backgrounds for neutrino telescopes, tests of special relativity and effects in the interplanetary magnetic field. The focus will be recent and not-so-recent results from the MINOS experiment.

Researchers model birth of universe in one of largest cosmological simulations ever runOctober 29, 2015

Researchers are sifting through an avalanche of data produced by one of the largest cosmological simulations ever performed, led by scientists at Argonne.

Composite Spin-1 Resonances at the LHC

Composite spin-1 resonances are a universal feature of composite Higgs models. In this talk, I will discuss the phenomenology of such resonances at the LHC, motivated by the possible observation of a diboson resonance in the 8 TeV LHC data. Particular attention is paid to the role played by fermion partial compositeness which is an important component in composite Higgs models. I will address the viability of such resonances to account for the LHC excess and make projections for the discovery potential at the 13 TeV LHC.