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
Aaij R
(2015)
Measurement of the forward Z boson production cross-section in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV
in Journal of High Energy Physics
Aaij R
(2015)
Measurement of the forward-backward asymmetry in Z/?* ? µ + µ - decays and determination of the effective weak mixing angle
in Journal of High Energy Physics
Khachatryan V
(2015)
Measurement of the inclusive 3-jet production differential cross section in proton-proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range.
in The European physical journal. C, Particles and fields
Khachatryan V
(2016)
Measurement of the inclusive jet cross section in pp collisions at $$\sqrt{s} = 2.76\,\text {TeV}$$ s = 2.76 TeV
in The European Physical Journal C
Tholen H
(2016)
Measurement of the Inclusive Top-Quark Pair + Photon Production Cross Section
in Nuclear and Particle Physics Proceedings
Khachatryan V
(2016)
Measurement of the inelastic cross section in proton-lead collisions at s NN = 5.02 TeV
in Physics Letters B
Aaij R
(2015)
Measurement of the inelastic pp cross-section at a centre-of-mass energy of s $$ \sqrt{s} $$ = 7 TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of the integrated and differential t t ¯ production cross sections for high- p T top quarks in p p collisions at s = 8 TeV
in Physical Review D
Zepeda Fernández C
(2016)
Measurement of the J/? cross section in pp collisions at v s = 13 TeV
in Journal of Physics: Conference Series
Aaij R
(2017)
Measurement of the J/? pair production cross-section in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV
in Journal of High Energy Physics
Aaij R
(2015)
Measurement of the lifetime of the B c + meson using the B c + ? J / ? p + decay mode
in Physics Letters B
Aaij R
(2018)
Measurement of the Lifetime of the Doubly Charmed Baryon ?_{cc}^{++}.
in Physical review letters
Aaij R
(2016)
Measurement of the mass and lifetime of the O b - baryon
in Physical Review D
Aaij R
(2019)
Measurement of the mass and production rate of ? b - baryons
in Physical Review D
Aaij R
(2019)
Measurement of the Mass Difference Between Neutral Charm-Meson Eigenstates.
in Physical review letters
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
Ghosh S
(2016)
Measurement of the muon charge asymmetry in inclusive pp?W+X production at s = 7 TeV at CMS and an improved determination of light parton distribution functions
in Nuclear and Particle Physics Proceedings
Aaij R
(2018)
Measurement of the O_{c}^{0} Baryon Lifetime.
in Physical review letters
Aaij R
(2017)
Measurement of the phase difference between short- and long-distance amplitudes in the [Formula: see text] decay.
in The European physical journal. C, Particles and fields
Khachatryan V
(2015)
Measurement of the pp ? ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at s = 8 TeV
in Physics Letters B
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
Aaij R
(2021)
Measurement of the prompt-production cross-section ratio s ( ? c 2 ) / s ( ? c 1 ) in p Pb collisions at s N N = 8.16 TeV
in Physical Review C
Aaij R
(2016)
Measurement of the properties of the ? b * 0 baryon
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of the ratio B ( B s 0 ? J / ? f 0 ( 980 ) ) / B ( B s 0 ? J / ? ? ( 1020 ) ) in pp collisions at s = 7 TeV
in Physics Letters B
Aaij R
(2017)
Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B + ? J/?p + and B + ? J/?K +
in Journal of High Energy Physics
Aaij R
(2016)
Measurement of the ratio of branching fractions B B c + ? J / ? K + / B B c + ? J / ? p + $$ \mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{+}\to \mathrm{J}/{\uppsi \mathrm{K}}^{+}\right)/\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{+}\to \mathrm{J}/{\uppsi \uppi}^{+}\right) $$
in Journal of High Energy Physics
Aaij R
(2015)
Measurement of the ratio of branching fractions B(B[over ¯]^{0}?D^{*+}t^{-}?[over ¯]_{t})/B(B[over ¯]^{0}?D^{*+}µ^{-}?[over ¯]_{µ}).
in Physical review letters
Aaij R
(2018)
Measurement of the Ratio of Branching Fractions B(B_{c}^{+}?J/?t^{+}?_{t})/B(B_{c}^{+}?J/?µ^{+}?_{µ}).
in Physical review letters
Aaij R
(2018)
Measurement of the Ratio of the B^{0}?D^{*-}t^{+}?_{t} and B^{0}?D^{*-}µ^{+}?_{µ} Branching Fractions Using Three-Prong t-Lepton Decays.
in Physical review letters
Khachatryan V
(2015)
Measurement of the ratio of the production cross sections times branching fractions of B c ± ? J/?p ± and B± ? J/?K ± and B B c ± ? J / ? p ± p ± p ± / B B c ± ? J / ? p ± $$ \mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm }{\pi}^{\pm }{\pi}^{\mp}\right)/\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm}\right) $$ in pp collisions at s = 7 $$ \
in Journal of High Energy Physics
Aaij R
(2019)
Measurement of the relative B - ? D 0 / D * 0 / D * * 0 µ - ? ¯ µ branching fractions using B - mesons from B ¯ s 2 * 0 decays
in Physical Review D
Aaij R
(2020)
Measurement of the relative branching fractions of B + ? h + h ' + h ' - decays
in Physical Review D
Aaij R
(2015)
Measurement of the semileptonic CP asymmetry in B0-B[over ¯]0 mixing.
in Physical review letters
Aaij R
(2020)
Measurement of the shape of the $$ {B}_s^0\to {D}_s^{\ast -}{\mu}^{+}{\nu}_{\mu } $$ differential decay rate
in Journal of High Energy Physics
Aaij R
(2017)
Measurement of the shape of the ? b 0 ? ? c + µ - ? ¯ µ differential decay rate
in Physical Review D
Khachatryan V
(2016)
Measurement of the t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ production cross section in the eµ channel in proton-proton collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV
in Journal of High Energy Physics
Aaij R
(2015)
Measurement of the time-dependent CP asymmetries in B s 0 ? J/?K S 0
in Journal of High Energy Physics
Aaij R
(2015)
Measurement of the time-integrated CP asymmetry in D 0 ? K S 0 K S 0 decays
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of the top quark mass using charged particles in p p collisions at s = 8 TeV
in Physical Review D
Khachatryan V
(2016)
Measurement of the top quark mass using proton-proton data at ( s ) = 7 and 8 TeV
in Physical Review D
Khachatryan V
(2016)
Measurement of the Top Quark Pair Production Cross Section in Proton-Proton Collisions at v[s]=13 TeV.
in Physical review letters
Collaboration T
(2015)
Measurement of the track reconstruction efficiency at LHCb
in Journal of Instrumentation
Lee S
(2016)
Measurement of the transverse momentum distribution of Z bosons decaying to dimuons in pp collisions at s = 8 TeV
in Nuclear and Particle Physics Proceedings
Khachatryan V
(2017)
Measurement of the transverse momentum spectra of weak vector bosons produced in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2015)
Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at s = 2.76 $$ \sqrt{s}=2.76 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at s = 8 TeV
in Physics Letters B
Khachatryan V
(2015)
Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
in Journal of High Energy Physics
Khachatryan V
(2017)
Measurement of the WZ production cross section in pp collisions at s = 13 TeV
in Physics Letters B
Aaij R
(2017)
Measurement of the Y(nS) polarizations in pp collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV
in Journal of High Energy Physics
Khachatryan V
(2016)
Measurement of the Z ? ? ? ? ? ? production cross section in pp collisions at s = 8 TeV and limits on anomalous ZZ? and Z?? trilinear gauge boson couplings
in Physics Letters B
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 |