Chris Hays

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Chris Hays

Professor

My research consists of measurements and searches to test the Electroweak force and the generation of particle masses via the Higgs mechanism in the Standard Model. The current aim of these measurements is to understand the origin of the mass of the Higgs boson itself, which receives large quantum corrections and whose value suggests the existence of a yet-undiscovered particle that could be produced by the LHC.

In my past research I contributed to the discovery of the Higgs boson in 2012 by the ATLAS experiment at the LHC, through coordination of theoretical estimates in the search for Higgs boson decays to W boson pairs. I subsequently coordinated the most precise measurement of this decay channel. Prior to joining ATLAS, I was a lead analyser on the world's most precise measurement of the W boson mass with the CDF experiment at the Tevatron. I am currently working to improve measurements of the Higgs and W bosons at ATLAS and at CDF.

I am currently teaching a postgraduate course in Electroweak physics, starting from the basic principles. Links to the lecture notes and current problem sets are below.

Lecture notes

Problem sets:
Geometry of the electroweak theory (2017)
Feynman diagrams and renormalization (2017)
Gauge boson parameters and predictions (2017)
Scalar parameters and predictions (2017)

Higgs production:

Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector,
arXiv:1610.07922 (2016): 115 citations as of 3 June 2017.
arxiv link

Measurement of fiducial differential cross sections of gluon-fusion production of Higgs bosons to WW*->evuv with the ATLAS detector at √s=8 TeV,
J. High En. Phys. 1608 (2016) 104: 19 citations as of 3 June 2017.
Journal link and arxiv link

Observation and measurement of Higgs boson decays to WW* with the ATLAS detector,
Phys. Rev. D92, 012006 (2015): 164 citations as of 3 June 2017.
Journal link and inspire link

Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC,
Phys. Lett. B726 (2013) 88-116: 564 citations as of 3 June 2017.
Journal link

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC,
Phys. Lett. B716 (2012) 1-29: 7316 citations as of 3 June 2017.
Journal link

Higgs boson coupling sensitivity at the LHC using H->tau tau decays,
Phys. Rev. D 86, 073009 (2012): 12 citations as of 3 June 2017.
Journal link

Electroweak boson self-couplings:

Measurements of electroweak Wjj production and constraints on anomalous gauge couplings with the ATLAS detector,
Eur. Phys. J. C 77 (2017): 1 citation as of 21 July 2017.
Journal link and arxiv link

Measurement of total and differential W+W− production cross sections in proton-proton collisions at √s=8 TeV with the ATLAS detector and limits on anomalous triple-gauge-boson couplings,
J. High En. Phys. 1609 (2016) 029: 40 citations as of 3 June 2017.
Journal link and arxiv link

Measurement of W+W− production in pp collisions at √s=7 TeV with the ATLAS detector and limits on anomalous WWZ and WWγ couplings,
Phys. Rev. D87 (2013) 11, 112001: 170 citations as of 3 June 2017.
Journal link

Measurement of the WW cross section in √s=7 TeV pp collisions with the ATLAS detector and limits on anomalous gauge couplings,
Phys. Lett. B712 (2012) 289-308: 69 citations as of 3 June 2017.
Journal link

W mass measurements:

Measurement of the W-boson mass in pp collisions at √s=7 TeV with the ATLAS detector,
arXiv:1701.07240 (2017): 8 citations as of 3 June 2017.
arxiv link

Precise measurement of the W-boson mass with the Collider Detector at Fermilab,
Phys.Rev. D89, 072003 (2014): 20 citations as of 3 June 2017.
Journal link

Precise measurement of the W-boson mass with the CDF II detector,
Phys. Rev. Lett. 108, 151803 (2012): 111 citations as of 3 June 2017.
Journal link

First run II measurement of the W boson mass at the Fermilab Tevatron,
Phys. Rev. D77, 112001 (2008): 119 citations as of 3 June 2017.
Journal link

First measurement of the W boson mass in Run II of the Tevatron,
Phys.Rev.Lett. 99, 151801 (2007): 89 citations as of 3 June 2017.
Journal link

Searches and phenomenology:

Prospects for new physics in τ→lμμ at current and future colliders,
JHEP05 (2017) 014: 1 citation as of 3 June 2017.
Journal link and arxiv link

A search for high-mass resonances decaying to dimuons at CDF,
Phys.Rev.Lett. 102 (2009) 091805: 140 citations as of 3 June 2017.
Journal link and arxiv link

New techniques in the search for Z' and other neutral resonances,
Mod.Phys.Lett. A24 (2009) 2387-2403: 10 citations as of 3 June 2017.
Journal link and arxiv link

Search for doubly-charged Higgs bosons decaying to dileptons in pp collisions at √s=1.96 TeV,
Phys.Rev.Lett. 93 (2004) 221802: 125 citations as of 3 June 2017.
Journal link and arxiv link

Production and decay of spinning black holes at colliders and tests of black hole dynamics,
Phys.Rev. D66 (2002) 116005: 38 citations as of 3 June 2017.
Journal link and arxiv link

Search for leptoquark pairs decaying to νν+jets in pp collisions at √s=1.8 TeV,
Phys.Rev.Lett. 88 (2002) 191801: 25 citations as of 3 June 2017.
Journal link and arxiv link

Technical publications:

Drift Chamber Alignment using Cosmic Rays,
Nuclear Instrum. Meth. Phys. Res. A 762, 85 (2014): 1 citation as of 3 June 2017.
Journal link and arxiv link

Electromagnetic Shower Properties in a Lead-Scintillator Sampling Calorimeter,
Nucl.Instrum.Meth. A729 (2013) 25-35: 3 citations as of 3 June 2017.
Journal link and arxiv link

Inside-out tracking at CDF,
Nucl.Instrum.Meth. A538 (2005) 249-254: 33 citations as of 3 June 2017.
Journal link

Identification of cosmic rays using drift chamber hit timing,
Nucl.Instrum.Meth. A506 (2003) 110-118: 24 citations as of 3 June 2017.
Journal link