Research Highlights for ATLAS Oxford Group

Oxford particle physicists, working with colleagues at CERN’s Large Hadron Collider (LHC), have just released results of their search for some of the most sought-after particles in physics. The particles the team are seeking are relatives of the famous Higgs boson that are predicted by a theory known as Supersymmetry.

Prof. Todd Huffman, Prof. Jeff Tseng, and project student Charles Jackson of the Oxford ATLAS Exotics Group have recently published a paper on a new method of tagging ultra-high energy B hadrons in jets. The paper featured on the cover of the Journal of Physics G: Nuclear and Particle Physics.

First year Oxford graduate student Jesse Liu has just released a paper showing how the increase in LHC energy from 8 to 13 TeV has squeezed the permissible models of the theory of supersymmetry.

Supersymmetric theories predicts particles that could help explain the mysterious dark matter in our universe, and which can be produced at the LHC, so they are well worth pursuing.

University of Oxford graduate students have led the first paper for Supersymmetry using the full 2015 data-set from the ATLAS experiment at the CERN Large Hadron Collider, with the whole Oxford SUSY group working together to complete it in record time.

This is the first search for supersymmetry anywhere in the world to use data collected with the higher center-of-mass energy of 13 TeV. The increase in energy has allowed the analysis team to explore further than ever before, and they have put the tightest constraints on the existence of these new particles yet.

Several Oxford led results were presented at the LHC Experiments Committee (LHCC) open meeting at CERN, on Wednesday the 02.12.2015. The LHCC reviews on a regular basis the accelerator and the experiments. At the open presentations the experiments have the opportunity to present their latest and most important results.

Oxford physics graduate student Will Fawcett, working with an international team at CERN, is delighted to have completed the most comprehensive assessment to date of the impact of the Large Hadron Collider (LHC) on a leading theory of subatomic physics.

Dr James Frost and Dr Koichi Nagai, both members of the Oxford ATLAS group received the ATLAS Outstanding Achievement Awards.

James received it for his outstanding contributions to the Data Preparation area, particularly for serving as Prompt Reconstruction Operations Coordinator (PROC) and Data Quality (DQ) convener during the long shutdown one (LS1) of the LHC. His work allowed cosmic data to be reconstructed and monitored, without which the detector couldn't have been commissioned for the 13 TeV start of the LHC last week.

CERN, Geneva 3 June 2015

Two Oxford graduate students, Will Fawcett and Will Kalderon (see first Figure: Will K standing left, Will F seated center), found themselves at the heart of a jam-packed CERN control room this morning, helping run the ATLAS experiment as the Large Hadron Collider smashed together two beams of subatomic protons, to generate the world’s highest-energy collisions. The two Wills are among 7 Oxford graduate students on attachment to the European Laboratory for Particle Physics, working on the world’s biggest experiments.

The first ever search for the supersymmetric partner of the charm quark, led by Oxford graduate student Will Kalderon, has been selected by the ATLAS experiment at CERN as one of its physics highlights of the first run of the LHC.

The Oxford ATLAS group performed analysis central to the recently published W+jets and R-jets measurements. Graduate student, Craig Sawyer, worked with ATLAS collaborators to perform these precision Standard Model measurements which extend such measurements to higher energies and regions than have ever been explored.

The Oxford ATLAS group played a decisive role in a newly released analysis searching for exotic particles decaying to two jets in ATLAS. The ATLAS dijet search analysis team was led by Oxford student, Katherine Pachal member of the Oxford Exotics Group.

University of Oxford graduate students have led the first two papers for Supersymmetry using the full data-set from the ATLAS experiment at the CERN Large Hadron Collider.

Following the announcement of a discovery of a new boson on July 4th, 2012, focus turned to determining whether this new boson had the key properties of the predicted Higgs boson: production and decay rates to fermions and electroweak bosons determined by the particles' masses, and no intrinsic spin.

The Oxford group played a leading role in the ATLAS measurement of the strange quark parton density in the proton. The ATLAS W- and Z-boson data indicate that the strange quark is not suppressed at low values of Bjorken x, the momentum that the quark which is struck in a collision takes as a fraction of the proton’s momentum.

The Oxford ATLAS group played a key role in the first 13 TeV ATLAS search paper, which was recently released to the public. The analysis presented in the paper searches for new particles that decay into two back-to-back jets (dijets), using data collected by the ATLAS detector in 2015.