High-energy physics

Used MRI magnets get a second chance at life in high-energy physics experimentsMay 21, 2015

Researchers at Argonne recently acquired two decommissioned magnets from magnetic resonance imaging (MRI) scanners from hospitals in Minnesota and California that will find a new home as proving grounds for instruments used in high-energy and nuclear physics experiments.

Heavy Higgs Bosons at 14TeV and 100TeV

  1. Strategies to cover the wedge region in the mA - tan_beta plane via directly searching for the neutral MSSM Higgs.
  2. Leptonic and hadronic top tagging in boosted case, using BDT method.
  3. Global sensitivity reach of the MSSM Higgs searches (both neutral and charged Higgs bosons) at the LHC and a 100 pp-collider, with the facilitate of (1) and (2).
Host Galaxies of Type Ia Supernovae
The discovery of the accelerating expansion of the Universe and thus the existence of dark energy was made possible by the study of Type Ia supernovae (SNe Ia). These explosions are excellent standardizable candles that can be seen out to great distances and used to constrain cosmological parameters. However, in an era when modern surveys are discovering hundreds of SNe Ia and upcoming surveys plan to find thousands more, we are now limited by systematic uncertainties in SN cosmology rather than statistics.
Physicist Peter Winter wins Department of Energy Early Career AwardMay 19, 2015

High-energy physicist Peter Winter has received a DOE Early Career Award, a prestigious five-year research grant totaling $2.5 million.

The State of New Physics in Rare B Decays
I will discuss interpretations of the recent updated angular analysis of the B->K*mu+mu- decay by the LHCb collaboration. A global fit to all relevant measurements probing the flavor changing neutral current b->s mu mu transition shows significant tensions with Standard Model expectations. Assuming hadronic uncertainties are estimated in a sufficiently conservative way, I will discuss the implications of the experimental results on new physics, both model independently as well as in the context of models with flavor changing Z' bosons.

Recent Measurements in the Top Quark Sector at DO and CMS
The talk will discuss recent measurements in the top quark sector, the heaviest known elementary particle known so far, performed at the Fermilab Tevatron Collider and at the LHC. I will highlight Tevatron results that are competitive to those at the LHC, especially regarding the top quark mass and production asymmetry. The talk will present CMS results on the top quark mass and Yukawa coupling. I will conclude with a discussion of the implications for the standard model electroweak sector.


Making Sense of the XYZ Mesons from QCD
The XYZ mesons are unexpected mesons containing a heavy quark and antiquark that have been discovered in the last decade. Their number has grown to about two dozen. Many of them are surprisingly narrow, and several are electrically-charged tetraquark mesons. Their existence presents a serious challenge to our understanding of the spectrum of QCD. I will explain how the Born-Oppenheimer approximation may provide a framework for understanding the XYZ mesons.