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LNS Special Seminars


 

Tuesday, January 5, 2016

hosted by:   Prof. Janet Conrad

    2:00 PM

    Kolker Room, 26-414

 

T2K Neutrino Oscillation Results and Future Developments

Speaker: Andrew Missert- University of Colorado, Boulder

 

Abstract: The Tokai-to-Kamioka (T2K) experiment is an accelerator-based long-baseline neutrino oscillation experiment that uses a unique off-axis neutrino beam to precisely measure the parameters that govern neutrino flavor oscillations. This talk will outline the experiment and the current results, which offer tantalizing hints regarding the existence of CP violation in the neutrino sector. It will also cover future improvements to the T2K analysis, most notably the development of a new maximum-likelihood event reconstruction algorithm for Super Kamiokande, which could be used to squeeze even more information about the oscillation parameters from the existing data.


Friday, February 19, 2016

hosted by:   Prof. Janet Conrad

    2:00 PM

    Kolker Room, 26-414

 

Review of the Status and Future Prospects of Dark Matter Searches at Colliders

Speaker: Sarah Malik- Imperial College London

 

Abstract: Understanding the nature of dark matter is one of the most compelling, long standing questions in physics.

I will review the results of searches for dark matter at CMS in Run 1 of the LHC and what we can expect in Run 2 and beyond. I will also discuss recent developments in dark matter phenomenology and highlight the compelling interplay between the searches for dark matter from the different cross-disciplinary experiments.


Friday, February 26, 2016

hosted by:   Prof. Bolek Wyslouch

    2:00 PM

    Kolker Room, 26-414

 

Searching for New Physics with the Large Hadron Collider

Speaker: Frank Golf- University of California, Santa Barbara

 

Abstract: : After a two year shutdown, the LHC restarted proton-proton collisions in 2015 with an increase in center-of-mass energy to 13 TeV. I describe some early results with data from the first year of running and plans for the significantly larger datasets that we expect to collect in the coming years.

 


Monday, April 25, 2016

hosted by:   Prof. Richard Milner

    2:00 PM

    Kolker Room, 26-414

 

Two-photon exchange corrections in elastic lepton-proton interaction

Speaker: Oleksandr Tomalak

 

Abstract: : In recent years, elastic electron-proton scattering experiments, with and without polarized protons, gave strikingly different results for the electric over magnetic proton form factor ratio. A mysterious discrepancy ("the proton radius puzzle") has been observed in the measurement of the proton charge radius in muon spectroscopy experiments versus electron spectroscopy and electron scattering. Two-photon exchange (TPE) contributions are the largest source of the hadronic uncertainty in these experiments. We estimate the forward Compton scattering subtraction function and corresponding correction to the Lamb shift of 2S level in muonic hydrogen from the proton structure function data in high-energy and resonance regions. We also compare the existing models of the elastic contribution to TPE correction in lepton-proton scattering. A subtracted dispersion relation formalism for the TPE in electron-proton scattering has been developed and tested. Its relative effect on cross section is in the 1−2 % range for a low value of the momentum transfer. For the inelastic TPE contribution, the low momentum transfer expansion was studied, and a good agreement with the experimental TPE fit to electron data was found. Predictions are also given for a forthcoming muon-proton scattering experiment (MUSE).