School of Physics and Astronomy

Professor Steve Lloyd


Emeritus Professor of Experimental Particle Physics

Telephone: 020 7882 6050
Room Number: G. O. Jones Building, Room 206


I obtained a BSc in Physics with 1st Class Honours from Imperial College London in 1974 and a PhD in High Energy Physics from Imperial College London in 1978. From 1978 to 1982, I was a Research Assistant at Imperial College London.

From 1982 to 1984, I was a Temporary Lecturer at Oxford University. In 1984 I was appointed as a New Blood Lecturer at Queen Mary College. From 1990 to 1991, I was a Scientific Associate at CERN Geneva (while on sabbatical leave). In 1994 I was promoted to Reader in Experimental Particle Physics and in 2002 I was promoted to Professor of Experimental Particle Physics.

From 2008 to 2013, I was Director of Particle Physics Research Centre at Queen Mary University of London. From 2013 to 2016, I was Head of the School of Physics and Astronomy. I retired in 2016 and and became Emeritus Professor. I am a Fellow of the Institute of Physics.


Research Interests:

I have been involved in the discovery of two of the five fundamental gauge bosons of the Standard Model of Particle Physics, the gluon and the Higgs Boson.

I work on the ATLAS Experiment studying proton-proton collisions at the Large Hadron Collider, LHC, at CERN Geneva, Switzerland. In July 2012 ATLAS found the elusive Higgs particle, required to explain particle masses, and hopes to find other exciting physics such as Supersymmetry.

I am particularly involved in the development and operation of the 'Grid' - a massive distributed computer system necessary for the analysis of the vast amounts of data being produced by the LHC. I am Chair of the Collaboration Board of GridPP, a multi £M project to operate a UK Grid for Particle Physics.

I used to work on the OPAL Experiment at the LEP electron positron collider which studied the very highest energy collisions of electrons and positrons. These collisions produced Z bosons and pairs of W bosons, the mediators of the weak interactions. These studies led to extremely precise tests of the Standard Model of Particle Physics and showed that there are only 3 types of light neutrino and hence probably only 3 generations of quarks.


I have co-authored two books on Experimental Particle Physics:

Electron Positron Physics at the Z, M.G.Green, S.L.Lloyd, P.N.Ratoff and D.R.Ward, Institute of Physics Publishing (1998).
Electron-Positron Annihilation Physics, R.J.Barlow, B.Foster, G.P.Heath, S.L.Lloyd and R.Marshall, Adam Hilger (1989).

Refereed Journal Articles

I have co-authored 500+ papers as a member of the ATLAS Collaboration, 403 papers as a member of the OPAL Collaboration, 60 papers as a member of the TASSO Collaboration and 18 other papers.

Highlighted Papers

The discovery of the Higgs Boson:

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC, The ATLAS Collaboration, G. Aad et al., Phys.Lett. B716 (2012) 1-29.

Precise studies of the W and Z Bosons:

Measurement of the mass and width of the W boson, The OPAL Collaboration, G. Abbiendi. et al., Eur.Phys.J. C45 (2006) 307-335.
Precise determination of the Z resonance parameters at LEP: 'Zedometry', The OPAL Collaboration, G. Abbiendi. et al., Eur.Phys.J. C19 (2001) 587-651.

The discovery of the Gluon:

Evidence for Planar Events in e+ e- Annihilation at High-Energies, The TASSO Collaboration, R. Brandelik et al., Phys.Lett. B86 (1979) 243.

The GridPP Project:

How to deal with petabytes of data: the LHC Grid project, D. Britton and S.L. Lloyd, Rept.Prog.Phys. 77 (2014) 065902.

A full publication list can be found at ProSteveLloyd [PDF 213KB].

My ORCID is 0000-0002-5073-2264