Bristol Particle Physics Consolidated Grant 2015-19
Lead Research Organisation:
University of Bristol
Department Name: Physics
Abstract
The Bristol particle physics group will search for evidence of physics beyond the Standard Model, and work to understand the properties of new phenomena. We will carry out this study using a range of approaches and experiments.
At the CERN CMS experiment at the LHC, we will search for signatures of the production of dark matter and supersymmetric particles, using events with 'missing energy'. In the absence of a discovery, we will combine statistical information from our observations with results from cosmology and direct dark matter searches, to rule out potential theories of new physics. We will also use the very large datasets produced at the LHC to study the production and properties of the top quark, a standard model particle with unique properties.
We will use a complementary approach to search for new physics at the CERN LHCb experiment, looking for subtle signatures of new physics that manifest themselves in the decays of mesons containing heavy quarks. We will use similar approaches to test current ideas about the nature of fundamental quantum symmetries.
A number of new experiments are being prepared, and will be ready for use within or shortly after the grant period. The NA62 experiment at the CERN SPS will study the decays of kaons to look for signs of new physics. The SOLID experiment at the BR2 reactor will study neutrino oscillations on an ultra-short baseline of 5-10m. The SHiP experiment at the CERN SPS will use a very high intensity beam to search for 'dark particles' that are signatures of physics beyond the Standard Model. Finally, we have begun to make preparations for the detailed design and optimisation of detectors for a future linear collider.
We will continue our programme of particle detector R&D, contributing to the upgrade of CMS and LHCb, to the design and construction of new experiments, and to the development of new sensors and technologies. An important part of this programme will be collaboration with industry and other academic disciplines, in order to generate impact from our work.
At the CERN CMS experiment at the LHC, we will search for signatures of the production of dark matter and supersymmetric particles, using events with 'missing energy'. In the absence of a discovery, we will combine statistical information from our observations with results from cosmology and direct dark matter searches, to rule out potential theories of new physics. We will also use the very large datasets produced at the LHC to study the production and properties of the top quark, a standard model particle with unique properties.
We will use a complementary approach to search for new physics at the CERN LHCb experiment, looking for subtle signatures of new physics that manifest themselves in the decays of mesons containing heavy quarks. We will use similar approaches to test current ideas about the nature of fundamental quantum symmetries.
A number of new experiments are being prepared, and will be ready for use within or shortly after the grant period. The NA62 experiment at the CERN SPS will study the decays of kaons to look for signs of new physics. The SOLID experiment at the BR2 reactor will study neutrino oscillations on an ultra-short baseline of 5-10m. The SHiP experiment at the CERN SPS will use a very high intensity beam to search for 'dark particles' that are signatures of physics beyond the Standard Model. Finally, we have begun to make preparations for the detailed design and optimisation of detectors for a future linear collider.
We will continue our programme of particle detector R&D, contributing to the upgrade of CMS and LHCb, to the design and construction of new experiments, and to the development of new sensors and technologies. An important part of this programme will be collaboration with industry and other academic disciplines, in order to generate impact from our work.
Planned Impact
- There will be a societal impact amongst the general public as we publicise the results of our research through outreach.
- We will engage with school age students and teachers to convey the excitement of fundamental research, motivating more students to study STEM subjects at post-16 and HE levels.
- Engagement with UK industry through contracts and joint projects, and through the provision of well-trained physicists as employees, will result in economic impact
- Other academic disciplines will benefit from our skills, knowledge and capabilities, addressing a number of important problems across a range of fields
Full details are given in our Case for Support and Pathways to Impact document
- We will engage with school age students and teachers to convey the excitement of fundamental research, motivating more students to study STEM subjects at post-16 and HE levels.
- Engagement with UK industry through contracts and joint projects, and through the provision of well-trained physicists as employees, will result in economic impact
- Other academic disciplines will benefit from our skills, knowledge and capabilities, addressing a number of important problems across a range of fields
Full details are given in our Case for Support and Pathways to Impact document
Publications
Khachatryan V
(2017)
The CMS trigger system
in Journal of Instrumentation
Khachatryan V
(2017)
Measurement of the WZ production cross section in pp collisions at s = 13 TeV
in Physics Letters B
Khachatryan V
(2016)
Measurement of inclusive jet production and nuclear modifications in pPb collisions at [Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Angular coefficients of Z bosons produced in pp collisions at s = 8 TeV and decaying to µ + µ - as a function of transverse momentum and rapidity
in Physics Letters B
Khachatryan V
(2015)
Search for a light charged Higgs boson decaying to c s ¯ $$ \mathrm{c}\overline{\mathrm{s}} $$ in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Study of final-state radiation in decays of Z bosons produced in p p collisions at 7 TeV
in Physical Review D
Khachatryan V
(2016)
Measurement of the top quark mass using charged particles in p p collisions at s = 8 TeV
in Physical Review D
Khachatryan V
(2016)
Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in pp collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2015)
Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at [Formula: see text][Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2016)
Measurement of the ZZ production cross section and Z ?l+l-l'+l'- branching fraction in pp collisions at s = 13 TeV
in Physics Letters B
Khachatryan V
(2016)
Search for massive WH resonances decaying into the [Formula: see text] final state at [Formula: see text][Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2016)
Measurement of the differential cross section and charge asymmetry for inclusive [Formula: see text] production at [Formula: see text] TeV.
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Measurements of jet multiplicity and differential production cross sections of Z + jets events in proton-proton collisions at s = 7 TeV
in Physical Review D
Khachatryan V
(2016)
Measurement of the charge asymmetry in top quark pair production in p p collisions at s = 8 TeV using a template method
in Physical Review D
Khachatryan V
(2017)
Erratum: Search for single production of scalar leptoquarks in proton-proton collisions at s = 8 TeV [Phys. Rev. D 93 , 032005 (2016)]
in Physical Review D
Khachatryan V
(2015)
Search for a charged Higgs boson in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Search for the production of dark matter in association with top-quark pairs in the single-lepton final state in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2017)
Search for high-mass Z? resonances in e+e-? and µ + µ -? final states in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ and 13 TeV
in Journal of High Energy Physics
Khachatryan V
(2017)
Multiplicity and rapidity dependence of strange hadron production in pp, pPb, and PbPb collisions at the LHC
in Physics Letters B
Khachatryan V
(2017)
Observation of the decay B+??(2S)?(1020)K+ in pp collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2016)
Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at s = 8 TeV
in Physical Review D
Khachatryan V
(2016)
Search for new physics with the M T2 variable in all-jets final states produced in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at s = 8 TeV
in Physical Review D
Khachatryan V
(2015)
Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s = 8 TeV
in Physical Review D
Khachatryan V
(2016)
Measurement of [Formula: see text] production with additional jet activity, including [Formula: see text] quark jets, in the dilepton decay channel using pp collisions at [Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2016)
Measurement of the t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ production cross section in the eµ channel in proton-proton collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of Long-Range Near-Side Two-Particle Angular Correlations in pp Collisions at sqrt[s]=13 TeV.
in Physical review letters
Khachatryan V
(2017)
Search for heavy resonances decaying to tau lepton pairs in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2017)
Search for supersymmetry in events with one lepton and multiple jets in proton-proton collisions at s = 13 TeV
in Physical Review D
Khachatryan V
(2015)
Measurement of the production cross section ratio s(?b2(1P))/s(?b1(1P)) in pp collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2016)
Search for supersymmetry in p p collisions at s = 8 TeV in final states with boosted W bosons and b jets using razor variables
in Physical Review D
Khachatryan V
(2016)
Measurement of the mass of the top quark in decays with a J/? meson in pp collisions at 8 TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Combined search for anomalous pseudoscalar HVV couplings in VH ( H ? b b ? ) production and H ? VV decay
in Physics Letters B
Khachatryan V
(2015)
Limits on the Higgs boson lifetime and width from its decay to four charged leptons
in Physical Review D
Khachatryan V
(2016)
Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets
in Journal of High Energy Physics
Khachatryan V
(2016)
Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton-proton collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2015)
Measurements of differential and double-differential Drell-Yan cross sections in proton-proton collisions at [Formula: see text][Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Search for displaced supersymmetry in events with an electron and a muon with large impact parameters.
in Physical review letters
Khachatryan V
(2016)
Erratum to: Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Search for dark matter, extra dimensions, and unparticles in monojet events in proton-proton collisions at [Formula: see text][Formula: see text].
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Search for narrow high-mass resonances in proton-proton collisions at s = 8 TeV decaying to a Z and a Higgs boson
in Physics Letters B
Khachatryan V
(2015)
Search for new resonances decaying via WZ to leptons in proton-proton collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2016)
Searches for R -parity-violating supersymmetry in p p collisions at s = 8 TeV in final states with 0-4 leptons
in Physical Review D
Khachatryan V
(2016)
Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks.
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method.
in The European physical journal. C, Particles and fields
Khachatryan V
(2017)
Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
in Physics Letters B
Khachatryan V
(2016)
Search for pair-produced vectorlike B quarks in proton-proton collisions at s = 8 TeV
in Physical Review D
Description | Resources from this award funded our knowledge exchange programme, developing new detectors that are finding uses in medicine (radiotherapy), security and industrial applications. Findings have been discussed in outreach events, inspiring new generations and generating public interest. |
First Year Of Impact | 2015 |
Sector | Aerospace, Defence and Marine,Education,Energy,Healthcare,Security and Diplomacy |
Impact Types | Societal,Economic |
Description | DUNE UK Production Project |
Amount | £689,382 (GBP) |
Funding ID | ST/S00355X/1 |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 10/2019 |
End | 09/2024 |
Description | Graphcore's IPUs |
Organisation | Graphcore |
Country | United Kingdom |
Sector | Private |
PI Contribution | Evaluating Graphcore's novel IPU processors, and, for the first time, implementing Particle Physics relevant software on them. Of particular interest not only to us, but also the community interested in these novel processors, is that we did not only use IPUs for machine learning (although we did that, too), but also non ML applications (Kalman Filter). Our work was also beneficial to our industrial partner in optimising and debugging their API. |
Collaborator Contribution | Cloud Access to IPUs and technical support. |
Impact | Paper: https://inspirehep.net/literature/1812756 (accepted for publication) |
Start Year | 2019 |
Description | Antimatter Matters |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | No |
Geographic Reach | National |
Primary Audience | Public/other audiences |
Results and Impact | LHCb-UK and Alpha-UK organised a joint stand at the Royal Society summer exhibition 2016. The Bristol Particle Physics group participated in the organisation (printing T-shirts, stickers) and the presentation of the exhibits during the event. Antimatter Matters has its own website and has been presented at several other events throughout the UK. |
Year(s) Of Engagement Activity | 2016 |
URL | http://www.antimatter-matters.org/ |
Description | Bristol Bright Night 2014 |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | Yes |
Geographic Reach | Local |
Primary Audience | Public/other audiences |
Results and Impact | Various STFC and ERC funded members of the university of Bristol gave public talks to audiences of various sizes (ranging from "pitch talks" of 5 min, to particle physicists contributing to a planetarium demonstration), we had a stall with particle physics-related activities and engaged with members of the public. Feedback was excellent. Positive audience feedback. |
Year(s) Of Engagement Activity | 2014 |
URL | http://www.bristol.ac.uk/public-engagement/events/2014/bristol-bright-night.html |
Description | Colloquium |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Geographic Reach | Local |
Primary Audience | Other audiences |
Results and Impact | Public colloquium at the school of physics. |
Year(s) Of Engagement Activity | 2017 |
Description | Cosmic 100 project at Bristol Balloon Fiesta |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | Yes |
Geographic Reach | Local |
Primary Audience | Public/other audiences |
Results and Impact | Lots of discussions with the public at the LHC exhibit. Media coverage of balloon flight with particle detector. Don't know how to answer this. |
Year(s) Of Engagement Activity | 2012 |
URL | http://www.bris.ac.uk/news/2012/8694.html |
Description | Pint of Science |
Form Of Engagement Activity | A talk or presentation |
Part Of Official Scheme? | No |
Geographic Reach | Local |
Primary Audience | Public/other audiences |
Results and Impact | A talk and discussion on the theme of antimatter to a general audience in a pub (including a demonstration with a spark chamber through which muons and anti-muons passed), part of the "Pint of Science" series of events. |
Year(s) Of Engagement Activity | 2017 |
URL | https://pintofscience.co.uk/about/ |
Description | Women in STEMM |
Form Of Engagement Activity | Participation in an open day or visit at my research institution |
Part Of Official Scheme? | No |
Geographic Reach | Local |
Primary Audience | Schools |
Results and Impact | Event engaging year 8/9 students in science activities, with an emphasis on female role models. The Bristol particle physics group had a stand with hands-on activities, spark chamber, and a video presentation introducing famous female particle physicists. |
Year(s) Of Engagement Activity | 2017 |
URL | https://www.bristol.ac.uk/biochemistry/public/events/2017/event---women-in-stemm.html |