The Exploitation and Upgrade of the CMS and LHCb Experiments, Detector R&D and NA62
Lead Research Organisation:
University of Bristol
Department Name: Physics
Abstract
The Large Hadron Collider (LHC) is the largest particle accelerator to be built at CERN. It is the highest energy particle accelerator ever built, with a 27 km circumference, 100 m underground, straddling the French and Swiss border outside of Geneva. It will smash together protons travelling at 99.999999% of the speed of light 40 million times per second. With this machine, conditions similar to those a billionth of a second after the Big Bang will be reproduced. The Bristol particle physics group participate in 2 of the major experiments at the LHC, CMS and LHCb. The LHC is a discovery machine. The Standard Model of particle physics has been extremey successful in describing the physics of the Universe to date, but we know it to be incomplete. The Standard Model does not explain dark matter or dark energy, neutrino oscillations, or why the matter left in the universe wasn't destroyed by antimatter created at the big bang. The Standard Model recognizes four forces: electromagnetic force; the weak nuclear force; the strong nuclear force as well as gravity. It is believed that these forces could be different manifestation of something more fundamental. With the highest energies created to date, collisions at the LHC will push forward the frontiers of particle physics where we hope to find new physics particles and processes to explain these phenomenon. The Bristol group will be at the fore of answering these fundamental questions. The physics opportunities demand the development of novel sensors, detector systems and advanced computing techniques. These developments are at the cutting edge of technology. The Bristol group will be at the forefront in developing these systems for future experiments but also ensuring the knowledge generated will be transferred to the wider economy for enhanced productivity and economic growth.
Publications
Chatrchyan S
(2013)
Search for supersymmetry in events with photons and low missing transverse energy in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2011)
Measurement of the differential cross section for isolated prompt photon production in p p collisions at 7 TeV
in Physical Review D
Chatrchyan S
(2012)
Study of W boson production in PbPb and pp collisions at s NN = 2.76 TeV
in Physics Letters B
Chatrchyan S
(2013)
Publisher's Note: Measurements of differential jet cross sections in proton-proton collisions at s = 7 TeV with the CMS detector [Phys. Rev. D 87 , 112002 (2013)]
in Physical Review D
Chatrchyan S
(2011)
Measurement of the polarization of W bosons with large transverse momenta in W + jets events at the LHC.
in Physical review letters
Chatrchyan S
(2014)
Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at s NN = 2.76 TeV
in Physical Review C
Chatrchyan S
(2013)
Measurement of the elliptic anisotropy of charged particles produced in PbPb collisions at s N N = 2.76 TeV
in Physical Review C
Chatrchyan S
(2013)
Measurement of the ? ( 1 S ) , ? ( 2 S ) , and ? ( 3 S ) cross sections in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2011)
Search for first generation scalar leptoquarks in the e ? jj channel in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2012)
Study of the inclusive production of charged pions, kaons, and protons in pp collisions at $\sqrt{s} = 0.9, 2.76,\mbox{ and }7~\mbox{TeV}$
in The European Physical Journal C
Chatrchyan S
(2014)
Measurement of the ratio of inclusive jet cross sections using the anti- k T algorithm with radius parameters R = 0.5 and 0.7 in p p collisions at s = 7 TeV
in Physical Review D
Chatrchyan S
(2014)
Modification of jet shapes in PbPb collisions at s NN = 2.76 TeV
in Physics Letters B
Chatrchyan S
(2013)
Measurement of the prompt J / ? and ? ( 2 S ) polarizations in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2014)
Measurement of jet fragmentation in PbPb and p p collisions at s NN = 2.76 TeV
in Physical Review C
Chatrchyan S
(2011)
Study of Z Boson Production in PbPb Collisions at vS(NN)=2.76 TeV.
in Physical review letters
Chatrchyan S
(2012)
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at $\sqrt{s_{NN}}= 2.76\ \mbox{TeV}$
in The European Physical Journal C
Chatrchyan S
(2014)
Measurement of the triple-differential cross section for photon + jets production in proton-proton collisions at $ \sqrt{s} $ = 7 TeV
in Journal of High Energy Physics
Chatrchyan S
(2012)
A search for a doubly-charged Higgs boson in pp collisions at $\sqrt{s} = 7 \ \mbox{TeV}$
in The European Physical Journal C
Chatrchyan S
(2014)
Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02$$ s NN = 5.02 $$\,\text {TeV}$$ TeV
in The European Physical Journal C
Chatrchyan S
(2012)
Combined search for the quarks of a sequential fourth generation
in Physical Review D
Chatrchyan S
(2014)
Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at s $$ \sqrt{s} $$ = 7 TeV
in Journal of High Energy Physics
Chatrchyan S
(2012)
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
in Physics Letters B
Chatrchyan S
(2014)
Search for anomalous production of events with three or more leptons in p p collisions at s = 8 TeV
in Physical Review D
Chatrchyan S
(2012)
Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at $\sqrt{s} = 7~\mbox{TeV}$
in The European Physical Journal C
Chatrchyan S
(2014)
Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes.
in The European physical journal. C, Particles and fields
Chatrchyan S
(2014)
Measurement of inclusive W and Z boson production cross sections in pp collisions at sqrt[s] = 8 TeV.
in Physical review letters
Chatrchyan S
(2012)
Search for pair produced fourth-generation up-type quarks in pp collisions at s = 7 TeV with a lepton in the final state
in Physics Letters B
Chatrchyan S
(2012)
Search for physics beyond the standard model in events with a Z boson, jets, and missing transverse energy in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2014)
Study of double parton scattering using W + 2-jet events in proton-proton collisions at $ \sqrt{s} $ = 7 TeV
in Journal of High Energy Physics
Chatrchyan S
(2011)
Search for supersymmetry in pp collisions at v7 TeV in events with two photons and missing transverse energy.
in Physical review letters
Chatrchyan S
(2012)
Measurement of the electron charge asymmetry in inclusive W production in pp collisions at sqrt[s]=7 TeV.
in Physical review letters
Chatrchyan S
(2013)
Measurement of the azimuthal anisotropy of neutral pions in Pb-Pb collisions at sqrt[s](NN)] = 2.76 TeV.
in Physical review letters
Chatrchyan S
(2012)
Search for heavy neutrinos and W(R) bosons with right-handed couplings in a left-right symmetric model in pp collisions at sqrt[s]=7 TeV.
in Physical review letters
Chatrchyan S
(2011)
Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC
in Journal of High Energy Physics
Chatrchyan S
(2014)
Erratum: Search for anomalous $ t\overline{t} $ production in the highly-boosted all-hadronic final state
in Journal of High Energy Physics
Chatrchyan S
(2014)
Measurement of the muon charge asymmetry in inclusive p p ? W + X production at s = 7 TeV and an improved determination of light parton distribution functions
in Physical Review D
Chatrchyan S
(2011)
Search for supersymmetry in events with b jets and missing transverse momentum at the LHC
in Journal of High Energy Physics
Chatrchyan S
(2011)
Charged particle transverse momentum spectra in pp collisions at $ \sqrt {s} = 0.9 $ and 7 TeV
in Journal of High Energy Physics
Chatrchyan S
(2013)
Search for narrow resonances using the dijet mass spectrum in p p collisions at s = 8 TeV
in Physical Review D
Chatrchyan S
(2013)
Search for long-lived particles in events with photons and missing energy in proton-proton collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2011)
Search for three-jet resonances in pp collisions at square root(s)=7 TeV.
in Physical review letters
Chatrchyan S
(2011)
Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
in Physical Review D
Chatrchyan S
(2013)
Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8 TeV
in Physics Letters B
Chatrchyan S
(2012)
Measurement of the ? b cross section and the ? ¯ b to ? b ratio with J / ? ? decays in pp collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2011)
Observation and studies of jet quenching in PbPb collisions at s N N = 2.76 TeV
in Physical Review C
Chatrchyan S
(2013)
Angular analysis and branching fraction measurement of the decay B 0 ? K ? 0 µ + µ -
in Physics Letters B
Chatrchyan S
(2011)
Search for physics beyond the standard model using multilepton signatures in p p collisions at s = 7 TeV
in Physics Letters B
Chatrchyan S
(2014)
Erratum: Measurement of the $ \mathrm{t}\overline{\mathrm{t}} $ production cross section in the dilepton channel in pp collisions at $ \sqrt{s} $ = 8 TeV
in Journal of High Energy Physics
Chatrchyan S
(2013)
Measurement of the $\mathrm{t}\bar{\mathrm{t}}$ production cross section in the t+jets channel in pp collisions at $\sqrt{s}=7\ \mbox{TeV}$
in The European Physical Journal C
Chatrchyan S
(2014)
Observation of the Associated Production of a Single Top Quark and a W Boson in p p Collisions at s = 8 TeV
in Physical Review Letters
Description | The LHC has dominated the field during the review period, starting in 2009 after around fifteen years of preparation. The group made major contributions to the design, construction and commissioning of the CMS experiment. Bristol physicists have played a leading role in early data taking at CMS, with a significant contribution to several analyses, as well as taking on a number of roles within physics management. The group's physics programme encompasses both Standard Model measurements and searches for new physics in 'conventional' and 'exotic' channels. The group successfully targeted a number of analyses designed to make use of the early data in 2010, and has continued to provide leadership in these areas whilst also turning towards higher luminosity studies with systematic limitations. Group members also play a wider role in the scrutiny of CMS output, serving in numerous formal analysis review and editorial roles. Flavour physics has unique sensitivity to physics beyond the Standard Model (BSM). BSM particles can affect quark flavour changes through loop processes. Crucially, there is no kinematic cut-off for the masses inside the loops. This approach is therefore sensitive to new particles far heavier than those directly produced at even the highest-energy colliders - it allows us to see beyond the energy frontier. The more precisely we measure these processes, the further we can see. TheFlavour Physics group therefore had a comprehensive programme of beauty, charm and kaon physics at the precision frontier. The group has significant expertise in solid-state tracking detectors, both silicon and diamond, and has developed the infrastructure and skills to play a major role in the advancement of this technology. In this programme we have capitalised on Bristol's strengths in electronics and mechanical design, and have also begun new activities with gas ionisation sensors optimised for low cost and robustness. We exploit opportunities to contribute to future projects and upgrades of existing experiments, and to transfer particle physics technology to industry, the public sector, and other academic disciplines. |
Exploitation Route | Collaboration with Diamond Detectors Limited, to design and produce a very fast, diamond based spectroscopy system. This system will have significantly improved radiation hardness and count rates over existing detectors. It makes use of detector and readout technologies developed both in industry and within the group, and will open new markets in the medical, security and energy sectors. Development of a muon tomography system for the detection of illicit Special Nuclear Materials, in conjunction with the Atomic Weapons Establishment. The fine-pitch RPC technology developed is under study for several other industrial applications. The use of Grid computing technology in the modelling and economic impact assessment of landslides in developing countries. |
Sectors | Aerospace, Defence and Marine,Electronics,Pharmaceuticals and Medical Biotechnology,Other |
Description | CASE studentships. optimisation of mass storage systems & structural stability of lightweight carbon fibre structures with RAL. Development of a very fast, diamond based spectroscopy device) Diamond Detectors Ltd (DDL), Poole. Muon topography (AWE) |
First Year Of Impact | 2011 |
Sector | Aerospace, Defence and Marine,Electronics,Energy,Pharmaceuticals and Medical Biotechnology,Other |
Impact Types | Societal,Economic |
Description | A large-area detector for precision time-of-flight measurements |
Amount | € 2,696,000 (EUR) |
Funding ID | 291175 |
Organisation | European Research Council (ERC) |
Sector | Public |
Country | Belgium |
Start | 06/2012 |
End | 06/2016 |
Description | Upgrades of the Tracker and Trigger of the CMS experiment at the CERN LHC |
Amount | £1,135,033 (GBP) |
Funding ID | ST/K003216/1 |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 04/2013 |
End | 04/2017 |
Title | Grid |
Description | Development of Grid computing tools to enable handling of large datasets |
Type Of Material | Improvements to research infrastructure |
Year Produced | 2012 |
Provided To Others? | Yes |
Impact | Ongoing activity |
URL | http://mossaic.org |
Title | Metadata |
Description | Developments with using CouchDB |
Type Of Material | Data handling & control |
Year Produced | 2010 |
Provided To Others? | Yes |
Impact | ongoing |
URL | http://mossaic.org |
Description | CMS |
Organisation | European Organization for Nuclear Research (CERN) |
Department | Compact Muon Solenoid (CMS) |
Country | Switzerland |
Sector | Public |
PI Contribution | Shared analysis and detector contributions |
Collaborator Contribution | Shared analysis and detector contributions |
Impact | see publication list |
Description | LHCb |
Organisation | European Organization for Nuclear Research (CERN) |
Department | Large Hadron Collider Beauty Experiment (LHCb) |
Country | Switzerland |
Sector | Public |
PI Contribution | Scientific collaboration |
Collaborator Contribution | Shared analysis and building on experiment |
Impact | see list of papers |
Start Year | 2006 |
Description | NA62 |
Organisation | European Organization for Nuclear Research (CERN) |
Department | NA62 Rare Kaon-Decay Experiment |
Country | Switzerland |
Sector | Academic/University |
PI Contribution | Detector development |
Collaborator Contribution | Detector development & analysis |
Impact | http://na62.web.cern.ch/NA62/Documents/ReferenceDocuments.html |
Start Year | 2008 |