Chris Hays

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Chris Hays

Professor of Physics

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.

I am a member of the ATLAS experiment at the LHC, where I contributed to the 2012 discovery of the Higgs boson using its decay to a pair of W bosons. I have since performed several measurements of this channel and am currently studying production of the Higgs boson at high momentum. 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. My work continues to improve measurements of the Higgs and W bosons at ATLAS and at CDF.

I recently taught a postgraduate course in Electroweak physics, starting from the basic principles. A link to the last version of the lecture notes is given below.

Lecture notes

Higgs production and interpretation:

Angles on CP-violation in Higgs boson interactions,
Phys. Lett. B790 (2019) 372-379: 8 citations as of 19 August 2019.
Journal link and arxiv link

Measurements of gluon-gluon fusion and vector-boson fusion Higgs boson production cross-sections in the H→WW*→eνμν decay channel in pp collisions at √s=13 TeV with the ATLAS detector,
Phys.Lett. B789 (2019) 508-529: 16 citations as of 8 July 2019.
Journal link and arxiv link

Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector,
arXiv:1610.07922 (2016): 730 citations as of 19 August 2019.
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: 44 citations as of 8 July 2019.
Journal link and arxiv link

Observation and measurement of Higgs boson decays to WW* with the ATLAS detector,
Phys. Rev. D92, 012006 (2015): 235 citations as of 8 July 2019.
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: 645 citations as of 8 July 2019.
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: 9630 citations as of 19 August 2019.
Journal link

Higgs boson coupling sensitivity at the LHC using H->tau tau decays,
Phys. Rev. D 86, 073009 (2012): 13 citations as of 19 August 2019.
Journal link and arxiv 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), 474: 28 citations as of 19 August 2019.
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: 78 citations as of 8 July 2019.
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: 194 citations as of 8 July 2019.
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: 78 citations as of 19 August 2019.
Journal link

W mass measurements:

Measurement of the W-boson mass in pp collisions at √s=7 TeV with the ATLAS detector,
Eur. Phys. J. C 78 (2018), 110: 121 citations as of 19 August 2019.
Journal link and arxiv link

Precise measurement of the W-boson mass with the Collider Detector at Fermilab,
Phys.Rev. D89, 072003 (2014): 31 citations as of 8 July 2019.
Journal link and arxiv link

Precise measurement of the W-boson mass with the CDF II detector,
Phys. Rev. Lett. 108, 151803 (2012): 148 citations as of 19 August 2019.
Journal link

First run II measurement of the W boson mass at the Fermilab Tevatron,
Phys. Rev. D77, 112001 (2008): 128 citations as of 8 July 2019.
Journal link and arxiv link

First measurement of the W boson mass in Run II of the Tevatron,
Phys.Rev.Lett. 99, 151801 (2007): 93 citations as of 8 July 2019.
Journal link

Searches and phenomenology:

Prospects for new physics in τ→lμμ at current and future colliders,
JHEP05 (2017) 014: 12 citations as of 8 July 2019.
Journal link and arxiv link

A search for high-mass resonances decaying to dimuons at CDF,
Phys.Rev.Lett. 102 (2009) 091805: 143 citations as of 8 July 2019.
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 8 July 2019.
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: 132 citations as of 8 July 2019.
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 8 July 2019.
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 8 July 2019.
Journal link and arxiv link

Technical publications:

Drift Chamber Alignment using Cosmic Rays,
Nuclear Instrum. Meth. Phys. Res. A 762, 85 (2014): 2 citations as of 19 August 2019.
Journal link and arxiv link

Electromagnetic Shower Properties in a Lead-Scintillator Sampling Calorimeter,
Nucl.Instrum.Meth. A729 (2013) 25-35: 4 citations as of 19 August 2019.
Journal link and arxiv link

Inside-out tracking at CDF,
Nucl.Instrum.Meth. A538 (2005) 249-254: 38 citations as of 8 July 2019.
Journal link

Identification of cosmic rays using drift chamber hit timing,
Nucl.Instrum.Meth. A506 (2003) 110-118: 24 citations as of 8 July 2019.
Journal link