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School of Physical and Chemical Sciences

Professor Steve Lloyd

Steve

Emeritus Professor of Experimental Particle Physics

Email: s.l.lloyd@qmul.ac.uk
Telephone: 020 7882 6050
Room Number: G. O. Jones Building, Room 231

Profile

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

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.

Publications

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

    JavaException: java.lang.IllegalArgumentException: Illegal character in query at index 97: http://www.researchpublications.qmul.ac.uk/publications/GetAllStaffOutputXML.action?staffids=2016\nMeasurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at \sqrt{s}=7 and 8 TeVAad, Georges et al.JHEP, Volume 1608, page 045. Publication year: 2016DOI: 10.1007/JHEP08(2016)045\n2015\nCombined Measurement of the Higgs Boson Mass in pp Collisions at \sqrt{s}=7 and 8 TeV with the ATLAS and CMS ExperimentsAad, Georges et al.Phys.Rev.Lett., Volume 114, page 191803. Publication year: 2015DOI: 10.1103/PhysRevLett.114.191803\nJet energy measurement and its systematic uncertainty in proton-proton collisions at \sqrt{s}=7 TeV with the ATLAS detectorAad, Georges et al.Eur.Phys.J., Volume C75, page 17. Publication year: 2015DOI: 10.1140/epjc/s10052-014-3190-y\n2014\nMeasurement of the Higgs boson mass from the H\rightarrow \gamma\gamma and H \rightarrow ZZ^{*} \rightarrow 4\ell channels with the ATLAS detector using 25 fb^{-1} of pp collision dataAad, Georges et al.Phys.Rev., Volume D90, page 052004. Publication year: 2014DOI: 10.1103/PhysRevD.90.052004\nMeasurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton–proton collision dataAad, Georges et al.Eur.Phys.J., Volume C74, page 3130. Publication year: 2014DOI: 10.1140/epjc/s10052-014-3130-x\n2013\nJet energy measurement with the ATLAS detector in proton-proton collisions at \sqrt{s}=7 TeVAad, Georges et al.Eur.Phys.J., Volume C73, page 2304. Publication year: 2013DOI: 10.1140/epjc/s10052-013-2304-2\nImproved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHCAad, Georges et al.Eur.Phys.J., Volume C73, page 2518. Publication year: 2013DOI: 10.1140/epjc/s10052-013-2518-3\nEvidence for the spin-0 nature of the Higgs boson using ATLAS dataAad, Georges et al.Phys.Lett., Volume B726, page 120-144. Publication year: 2013DOI: 10.1016/j.physletb.2013.08.026\nObservation of Associated Near-Side and Away-Side Long-Range Correlations in \sqrt{s_{NN}}=5.02  TeV Proton-Lead Collisions with the ATLAS DetectorAad, Georges et al.Phys.Rev.Lett., Volume 110, page 182302. Publication year: 2013DOI: 10.1103/PhysRevLett.110.182302\n2012\nObservation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHCAad, Georges et al.Phys.Lett., Volume B716, page 1-29. Publication year: 2012DOI: 10.1016/j.physletb.2012.08.020\nElectron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision dataAad, Georges et al.Eur.Phys.J., Volume C72, page 1909. Publication year: 2012DOI: 10.1140/epjc/s10052-012-1909-1\nCombined search for the Standard Model Higgs boson using up to 4.9 fb^{-1} of pp collision data at \sqrt{s}=7 TeV with the ATLAS detector at the LHCAad, Georges et al.Phys.Lett., Volume B710, page 49-66. Publication year: 2012DOI: 10.1016/j.physletb.2012.02.044\nPerformance of Missing Transverse Momentum Reconstruction in Proton-Proton Collisions at 7 TeV with ATLASAad, Georges et al.Eur.Phys.J., Volume C72, page 1844. Publication year: 2012DOI: 10.1140/epjc/s10052-011-1844-6\nPerformance of the ATLAS Trigger System in 2010Aad, Georges et al.Eur.Phys.J., Volume C72, page 1849. Publication year: 2012DOI: 10.1140/epjc/s10052-011-1849-1\nMeasurement of the azimuthal anisotropy for charged particle production in \sqrt{s_{NN}}=2.76 TeV lead-lead collisions with the ATLAS detectorAad, Georges et al.Phys.Rev., Volume C86, page 014907. Publication year: 2012DOI: 10.1103/PhysRevC.86.014907\n2011\nLuminosity Determination in pp Collisions at \sqrt{s}=7 TeV Using the ATLAS Detector at the LHCAad, Georges et al.Eur.Phys.J., Volume C71, page 1630. Publication year: 2011DOI: 10.1140/epjc/s10052-011-1630-5\nCharged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHCAad, G. et al.New J.Phys., Volume 13, page 053033. Publication year: 2011DOI: 10.1088/1367-2630/13/5/053033\nMeasurement of the top quark-pair production cross section with ATLAS in pp collisions at \sqrt{s}=7 TeVAad, Georges et al.Eur.Phys.J., Volume C71, page 1577. Publication year: 2011DOI: 10.1140/epjc/s10052-011-1577-6\n2010\nThe ATLAS Simulation InfrastructureAad, G. et al.Eur.Phys.J., Volume C70, page 823-874. Publication year: 2010DOI: 10.1140/epjc/s10052-010-1429-9\nObservation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at \sqrt{s_{NN}}=2.77 TeV with the ATLAS Detector at the LHCAad, Georges et al.Phys.Rev.Lett., Volume 105, page 252303. Publication year: 2010DOI: 10.1103/PhysRevLett.105.252303\n1984\nJet Production and Fragmentation in e+ e- Annihilation at 12-GeV to 43-GeVAlthoff, M. et al.Z.Phys., Volume C22, page 307-340. Publication year: 1984DOI: 10.1007/BF01547419\n1979\nEvidence for Planar Events in e+ e- Annihilation at High-EnergiesBrandelik, R. et al.Phys.Lett., Volume 86B, page 243-249. Publication year: 1979DOI: 10.1016/0370-2693(79)90830-X\nhttp://www.researchpublications.qmul.ac.uk/publications/GetStaffOutputXMLById.action?staffId=20857&flatXML=Y&listFavourites=Y&flatXML=Y