Experimental High Energy Particle Physics Research at UCL
Lead Research Organisation:
University College London
Department Name: Physics and Astronomy
Abstract
Experimental particle physics is about looking at extremely small sizes, or equivalently extremely high energies. It teaches us about the underlying nature of the physical universe, and the forces and laws that govern its development, from the first moments of the big bang, through to the present day, and far into the future. Particle physics has led to many revolutionary ideas, which have had a profound impact upon the way we think about ourselves and the world. One reason for the power of these ideas is that they are grounded in and tested by actual scientific observations of the world around us - that is, experiment. Without experiment, science is dead. Experiments capable of reaching these extremes of energy and size are very technically challenging. The challenges include devising precision detectors which can operate in hostile environments, particle accelerators which can achieve high energy collisions, super-sensitive detectors capable of identifying very rare decays with very small 'background noise', high-speed electronics which can read out millions of pieces of information per second, and robust, flexible software which can analyse the data in a distributed computing system all over the world. Thus another consequence of an active particle physics activity is a stimulation of technological developments and the training of people skilled in the development and use of high technology. This is a 'rolling grant', which means that it covers a broad variety of particle physics experiments. The rolling grant underpins the base of highly skilled research and technical staff which makes UCL able to be a leader in experimental physics at the very highest levels. It provides a measure of career security, as well as travel and equipment money. This also allows the group to function effectively in the training of PhD students, and we are in fact bidding to fund several PhD students on this grant. The science this grant will support includes: - Analysis of electron-proton collisions using the ZEUS detector at the HERA collider in Hamburg, which is telling us more and more about the internal structure of the proton and the photon, and about the strong nuclear force which holds the proton together. - Analysis of proton-antiproton collisions with the CDF detector at the Tevatron collider in Chicago, where precision measurements of the W boson (which carries the weak nuclear force), studies of the super-heavy top quark, and a search for the Higgs boson are underway. - Analysis of neutrino oscillations from the MINOS experiment in Chicago. The mysterious neutrino was once thought to be massless but is now known to have mass - MINOS will make the most precise measurement of the mixing between the different 'flavours' of neutrino. - Commisioning of the ATLAS detector at CERN, and analysis of the first date from the LHC. The LHC is the first collider to operate above the 'energy horizon' above which the weak and electromagentic forces are unified. As well as the Higgs, the LHC may find supersymmetry, extra spatial dimensions, or other exotica we have not even imagined. - Analysis of data from the NEMO-III experiment, a super-sensitive detector under a mountain in France searching for 'neutrinoless double beta decay'. If found, this rare process would not only provide the best measurement by far of the neutrino's mass, but would also prove that unlike all other particles, the neutrino is its own antiparticle. If true, this would give a big clue to physics at the 'grand unification' scale, where all forces are (perhaps!) unified. We also have other neutrino projects, work on the proposed international linear collider, and some theoretical activities, all largely funded on other grants. These projects benefit greatly from being co-sited with the rolling grant. All these projects contribute to the intellectually exciting environment that is UCL high energy physics.
Publications
Aaltonen T
(2009)
Search for top-quark production via flavor-changing neutral currents in W+1 jet events at CDF.
in Physical review letters
Aaltonen T
(2008)
Search for Bs0 --> micro+ micro- and B0 --> micro+ micro- decays with 2 fb-1 of pp collisions.
in Physical review letters
Aaltonen T
(2008)
First flavor-tagged determination of bounds on mixing-induced CP violation in Bs0 --> J/psiphi decays.
in Physical review letters
Aaltonen T
(2008)
Strong evidence for ZZ production in pp[over] collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2007)
Search for chargino-neutralino production in pp collisions at sq rt[s] = 1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Search for W W and W Z production in lepton plus jets final state at CDF
in Physical Review D
Aaltonen T
(2008)
Search for third generation vector leptoquarks in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2008)
Search for supersymmetry in pp collisions at sqrt[s]=1.96 TeV Using the trilepton signature for chargino-neutralino production.
in Physical review letters
Aaltonen T
(2009)
Evidence for a narrow near-threshold structure in the J/psivarphi mass spectrum in B;{+} --> J/psivarphiK;{+} decays.
in Physical review letters
Aaltonen T
(2008)
First observation of the decay Bs0-->Ds-Ds+ and measurement of its branching ratio.
in Physical review letters
Aaltonen T
(2009)
Search for hadronic decays of W and Z bosons in photon events in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2009)
Global search for new physics with 2.0 fb - 1 at CDF
in Physical Review D
Aaltonen T
(2009)
Search for the neutral current top quark decay t ? Z c using the ratio of Z -boson + 4 jets to W -boson + 4 jets production
in Physical Review D
Aaltonen T
(2008)
Measurement of Lifetime and Decay-Width Difference in B_{s};{0}-->J/psivarphi Decays.
in Physical review letters
Aaltonen T
(2009)
Search for high-mass e+e- resonances in pp collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Production of ? ( 2 S ) mesons in p p ¯ collisions at 1.96 TeV
in Physical Review D
Aaltonen T
(2008)
Search for chargino-neutralino production in p p ¯ collisions at s = 1.96 TeV with high- p T leptons
in Physical Review D
Aaltonen T
(2008)
Search for new heavy particles decaying to Z 0 Z 0 ? e e e e in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2009)
Observation of the O b - baryon and measurement of the properties of the ? b - and O b - baryons
in Physical Review D
Aaltonen T
(2009)
Inclusive search for squark and gluino production in pp[over ] collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Search for maximal flavor violating scalars in same-charge lepton pairs in pp collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Search for Gluino-Mediated Bottom Squark Production in pp[over ] Collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2008)
Search for heavy toplike quarks using lepton plus jets events in 1.96 TeV pp collisions.
in Physical review letters
Aaltonen T
(2008)
Limits on the production of narrow t t ¯ resonances in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2008)
Measurement of the single-top-quark production cross section at CDF.
in Physical review letters
Aaltonen T
(2009)
First measurement of the tt[over ] differential cross section dsigma/dM_{tt[over ]} in pp[over ] collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Measurement of the inclusive isolated prompt photon cross section in p p ¯ collisions at s = 1.96 TeV using the CDF detector
in Physical Review D
Aaltonen T
(2007)
Search for new particles leading to Z + jets final states in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2007)
Search for exclusive gammagamma production in Hadron-Hadron collisions.
in Physical review letters
Aaltonen T
(2009)
Search for new physics in the µ µ + e / µ + E? T channel with a low- p T lepton threshold at the Collider Detector at Fermilab
in Physical Review D
Aaltonen T
(2009)
Search for narrow resonances lighter than ? mesons
in The European Physical Journal C
Aaltonen T
(2008)
Observation of the Decay B c ± ? J / ? p ± and Measurement of the B c ± Mass
in Physical Review Letters
Aaltonen T
(2007)
Search for high-mass diphoton states and limits on Randall-Sundrum gravitons at CDF.
in Physical review letters
Aaltonen T
(2008)
Search for the Higgs boson produced in association with Z-->l+l in pp collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2008)
Measurement of ratios of fragmentation fractions for bottom hadrons in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2009)
Measurement of the t t ¯ production cross section in 2 fb - 1 of p p ¯ collisions at s = 1.96 TeV using lepton plus jets events with soft muon b tagging
in Physical Review D
Aaltonen T
(2007)
Observation and mass measurement of the baryon Xib-.
in Physical review letters
Aaltonen T
(2009)
Search for the Higgs boson produced in association with Z ? l + l - using the matrix element method at CDF II
in Physical Review D
Aaltonen T
(2009)
Measurement of the top quark mass using the invariant mass of lepton pairs in soft muon b -tagged events
in Physical Review D
Aaltonen T
(2008)
Search for Pair Production of Scalar Top Quarks Decaying to a t Lepton and a b Quark in p p ¯ Collisions at s = 1.96 TeV
in Physical Review Letters
Aaltonen T
(2008)
Measurement of b -jet shapes in inclusive jet production in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2009)
Top quark mass measurement in the lepton plus jets channel using a modified matrix element method
in Physical Review D
Aaltonen T
(2009)
Search for anomalous production of events with a photon, jet, b -quark jet, and missing transverse energy
in Physical Review D
Aaltonen T
(2007)
Searches for direct pair production of supersymmetric top and supersymmetric bottom quarks in p p ¯ collisions at s = 1.96 TeV
in Physical Review D
Aaltonen T
(2009)
First observation of B(s)(0) --> D(s)(+/-)K(-/+) and measurement of the ratio of branching fractions B(B(s)(0) --> D(s)(+/-)K(-/+)/B(B(s)(0) --> D(s)(+)pi(-)).
in Physical review letters
Aaltonen T
(2009)
Search for exclusive Z-boson production and observation of high-mass pp[over ]-->pgammagammap[over ]-->pl;{+}l;{-}p[over ] events in pp[over ] collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2009)
Measurement of resonance parameters of orbitally excited narrow B0 mesons.
in Physical review letters
Aaltonen T
(2009)
Observation of electroweak single top-quark production.
in Physical review letters
Aaltonen T
(2009)
Direct bound on the total decay width of the top quark in pp collisions at sqrt[s]=1.96 TeV.
in Physical review letters
Aaltonen T
(2007)
Measurement of the top-quark mass using missing E T + jets events with secondary vertex b -tagging at CDF II
in Physical Review D
Description | CERN/ATLANTIS |
Amount | £24,945 (GBP) |
Organisation | European Organization for Nuclear Research (CERN) |
Department | ATLAS Collaboration |
Sector | Academic/University |
Country | Switzerland |
Start | 04/2007 |
End | 11/2007 |
Description | CERN/MCNet |
Amount | £271,986 (GBP) |
Organisation | European Organization for Nuclear Research (CERN) |
Sector | Academic/University |
Country | Switzerland |
Start | 01/2007 |
End | 12/2010 |
Description | CERN/RTT |
Amount | £45,000 (GBP) |
Organisation | European Organization for Nuclear Research (CERN) |
Department | ATLAS Collaboration |
Sector | Academic/University |
Country | Switzerland |
Start | 03/2007 |
End | 03/2008 |
Description | DESY/Guest Scientist |
Amount | £34,930 (GBP) |
Organisation | Deutsches Electronen-Synchrotron (DESY) |
Sector | Academic/University |
Country | Germany |
Start | 06/2007 |
End | 06/2009 |
Description | DESY/ZEUS Studentship |
Amount | £41,000 (GBP) |
Organisation | Deutsches Electronen-Synchrotron (DESY) |
Sector | Academic/University |
Country | Germany |
Start | 09/2005 |
End | 09/2008 |
Description | DSTL/ACORNE Studentship |
Amount | £12,930 (GBP) |
Organisation | Defence Science & Technology Laboratory (DSTL) |
Sector | Public |
Country | United Kingdom |
Start | 09/2006 |
End | 03/2009 |
Description | EPSRC/ESLEA |
Amount | £134,810 (GBP) |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 02/2005 |
End | 01/2007 |
Description | EU/ARTEMIS |
Amount | £228,960 (GBP) |
Funding ID | 42051 |
Organisation | Spanish National Research Council (CSIC) |
Sector | Public |
Country | Spain |
Start | 09/2006 |
End | 09/2010 |
Description | EU/EUDET |
Amount | £194,229 (GBP) |
Funding ID | 26126 |
Organisation | Spanish National Research Council (CSIC) |
Sector | Public |
Country | Spain |
Start | 01/2006 |
End | 12/2009 |
Description | Humboldt/Research Fellowship |
Amount | £19,687 (GBP) |
Organisation | Alexander von Humboldt Foundation |
Sector | Public |
Country | Germany |
Start | 02/2008 |
End | 01/2009 |
Description | Nuffield/Precise determination of beam energies at an ILC |
Amount | £5,000 (GBP) |
Organisation | Nuffield Foundation |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 04/2005 |
End | 04/2007 |
Description | RS URF/Higgs Physics at ATLAS |
Amount | £244,218 (GBP) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 09/2008 |
End | 09/2013 |
Description | RS URF/QCD Phenomenology |
Amount | £30,171 (GBP) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 03/2006 |
End | 05/2008 |
Description | RS/UHE Neutrinos |
Amount | £121,500 (GBP) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 05/2007 |
End | 05/2009 |
Description | ARTEMIS |
Organisation | Spanish National Research Council (CSIC) |
Country | Spain |
Sector | Public |
PI Contribution | Training |
Collaborator Contribution | Training |
Impact | PhDs |
Start Year | 2006 |
Title | Scintillators |
Description | High resolution scintillators developed with ELJEN for SuperNEMO Scintillators |
Type Of Technology | Detection Devices |
Year Produced | 2008 |
Impact | Has potential application in precise energy measurement for proton cancer therapy. |
Description | Articles in National Press |
Form Of Engagement Activity | A magazine, newsletter or online publication |
Part Of Official Scheme? | No |
Geographic Reach | National |
Primary Audience | Public/other audiences |
Results and Impact | Again too numerous too itemize: articles/quotes etc for Times, Guardian, Telegraph, Independent, Scotsman, Evening Standard, THES etc . |
Year(s) Of Engagement Activity | 2008,2009,2010,2011,2012,2013 |
Description | IoP Physics in Perspective |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | National |
Primary Audience | Schools |
Results and Impact | Three talks each with other 250 school students . |
Year(s) Of Engagement Activity | 2007,2009,2011 |
Description | Podcasts |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | International |
Primary Audience | Public/other audiences |
Results and Impact | Again several of these for several organisations. . |
Year(s) Of Engagement Activity | 2009,2010,2011,2012,2013 |
Description | SET Parliament Session |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Poster Presentation |
Geographic Reach | National |
Primary Audience | Policymakers/politicians |
Results and Impact | MPs attended . |
Year(s) Of Engagement Activity | 2006 |
Description | School Visits / Schoolchildren mentoring |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | Local |
Primary Audience | Schools |
Results and Impact | These ate too numerous to create individual entries for. Our activities have ranged from talks in lessons, assemblies, career days, lab sessions. . |
Year(s) Of Engagement Activity | Pre-2006,2006,2007,2008,2009,2010,2011,2012,2013 |
Description | Short Films: Colliding Particles |
Form Of Engagement Activity | A press release, press conference or response to a media enquiry/interview |
Part Of Official Scheme? | Yes |
Geographic Reach | International |
Primary Audience | Public/other audiences |
Results and Impact | Series of short films about the background to Higgs discovery Online films |
Year(s) Of Engagement Activity | 2008,2009,2010,2011,2012 |
Description | TV/Radio appearances |
Form Of Engagement Activity | A press release, press conference or response to a media enquiry/interview |
Part Of Official Scheme? | No |
Type Of Presentation | Keynote/Invited Speaker |
Geographic Reach | International |
Primary Audience | Media (as a channel to the public) |
Results and Impact | Too numerous to list individually but we have made appearances on BBC1,BBC2, ITV, C4, Al Jazeera, Sky News, GMTV, News-24, Classic FM, Capital Radio, BBC R4. . |
Year(s) Of Engagement Activity | 2007,2008,2009,2010,2011,2012,2013 |