Phenomenology from Lattice QCD and Collider Physics
Lead Research Organisation:
University of Glasgow
Department Name: School of Physics and Astronomy
Abstract
The Glasgow theory group has a strong reputation in studies of the subatomic world, and pushing forward our understanding of how it works. This is aimed at uncovering the fundamental constituents of matter and the nature of the interactions that operate between them. There are two approaches to this, and we will use both of them. One is to perform very accurate calculations within the theoretical framework of the Standard Model that we believe correctly describes the particles that we have seen so far and the strong, weak and electromagnetic forces of Nature. Discrepancies between these accurate calculations and what is seen in experiments will then point the way to a deeper theory that describes fundamental particle physics more completely. The second method is concerned with what we might see in LHC results, now appearing, if one of the suggested deeper theories is correct. We must make sure that we optimise the analysis of these experiments to learn as much as possible. Accurate calculations in the Standard Model have foundered in the past on the difficult problem of how to handle the strong force. This force is important inside particles that make up the atomic nucleus, the proton and neutron and a host of similar particles called hadrons produced in high energy collisions. The constituents of these particles are quarks, and they are trapped inside hadrons by the behaviour of the strong force. This 'confinement' of quarks makes calculations of the effect of the strong force on the physics of hadrons very challenging. It can be tackled, however, using the numerical techniques of lattice QCD. This method has been tested thoroughly by the Glasgow group in precision calculations of hadron masses and their comparison to experiment, and its current acceptance as a precision tool is based in no small part on their work. Glasgow continues to lead progress and here we propose further, harder calculations that will predict more details of how hadrons decay from one type to another via the weak force. The comparison of accurate results with experiment will allow us to constrain the parameters of the weak force that give rise to violations of symmetry between matter and antimatter. We plan to halve existing errors for these calculations and that will allow us to test the Standard Model very stringently. The Glasgow team will also investigate theories that go beyond the Standard Model and tests of them that can be done with LHC data. For example, we will provide phenomenological studies of possible physics signatures that could be seen at LHC and how they would distinguish between models. This includes studying new particles that would be present in some models with a view to establishing their properties. In particular we will develop methods for studying the physics of top quarks, which will be produced copiously at LHC. The top is the heaviest quark that we have seen, and it provides an exciting window into new physics. Experimental studies in this area are being led by the Glasgow ATLAS group and we will coordinate with them to provide ways of testing top quark properties in detail, including behaviour that could arise in beyond the Standard Model scenarios. We are also developing new methods for increasing the accuracy of how quarks and gluons affect scattering experiments, which is useful for LHC physics, but may in addition lead to insights in other theories besides QCD. The next four years will be a very exciting time for theoretical particle physics and Glasgow aims to be at the forefront of this work.
Publications
Gardi E
(2011)
General properties of multiparton webs: proofs from combinatorics
in Journal of High Energy Physics
Godbole R
(2015)
Jet substructure and probes of CP violation in Vh production
in Journal of High Energy Physics
Godbole R
(2012)
Top polarisation studies in H - t and W t production
in Journal of High Energy Physics
Godbole R
(2014)
Boosting Higgs CP properties via VH production at the Large Hadron Collider
in Physics Letters B
Godbole, R.M. And Hartgring, L. And Niessen, I. And White, C.D.
(2013)
Polarisation studies in $H^{-}t$ production
Gregory E
(2011)
Precise B , B s , and B c meson spectroscopy from full lattice QCD
in Physical Review D
Harrison J
(2018)
Lattice QCD calculation of the B ( s ) ? D ( s ) * l ? form factors at zero recoil and implications for | V c b |
in Physical Review D
Hornbostel K
(2012)
Fast fits for lattice QCD correlators
in Physical Review D
Hudspith R.J.
Neutral Kaon mixing beyond the Standard Model
Hughes C
(2015)
Hindered M1 radiative decay of ? ( 2 S ) from lattice NRQCD
in Physical Review D
Kim J
(2012)
Two-point correlator fits on HISQ ensembles
Koponen J
(2016)
The strange and charm quark contributions to the anomalous magnetic moment of the muon from lattice QCD
in Nuclear and Particle Physics Proceedings
Koponen J
(2016)
Size of the pion from full lattice QCD with physical u , d , s and c quarks
in Physical Review D
Koponen, J. And Davies, C.T.H. And Donald, G.
(2012)
D to K and D to pi semileptonic form factors from Lattice QCD
Koponen, J. And Davies, C.T.H. And Donald, G.C. And Follana, E. And Lepage, G.P. And Others
(2013)
The shape of the D - K semileptonic form factor from full lattice QCD and V_cs
Koponen, Jonna And Bursa, Francis And Davies, Christine And Donald, Gordon And Dowdall, Rachel
(2013)
Pion electromagnetic form factor from full lattice QCD
Kraml S
(2012)
Searches for new physics: Les Houches recommendations for the presentation of LHC results
in The European Physical Journal C
Kronfeld A
(2012)
The 't Hooft vertex for staggered fermions and flavor-singlet mesons
Laenen E
(2011)
Next-to-eikonal corrections to soft gluon radiation: a diagrammatic approach
in Journal of High Energy Physics
Laiho J
(2011)
Light flavors on the lattice
Laiho J
(2011)
Evidence for asymptotic safety from lattice quantum gravity.
in Physical review letters
Laiho, Jack And Pecjak, Ben D. And Schwanda, Christoph
(2011)
CKM2010 Working Group II Summary
Lee A
(2013)
Mass of the b quark from lattice NRQCD and lattice perturbation theory
in Physical Review D
Luna A
(2015)
The classical double copy for Taub-NUT spacetime
in Physics Letters B
Lunghi E
(2012)
Flavor Physics in the LHC era: the role of the lattice
Lytle A
(2016)
NPR determination of quark masses from the HISQ action
Lytle Andrew T.
Charm and bottom quark masses on the lattice
McNeile C
(2012)
Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD
in Physical Review D
McNeile C
(2013)
Direct determination of the strange and light quark condensates from full lattice QCD
in Physical Review D
McNeile C
(2012)
High-precision f B s and heavy quark effective theory from relativistic lattice QCD
in Physical Review D
Melville S
(2014)
Wilson line approach to gravity in the high energy limit
in Physical Review D
Miller D
(2012)
Gravitational cusp anomalous dimension from AdS space
in Physical Review D
Miller D
(2013)
Supersymmetric SU(5) grand unification for a post Higgs boson era
in Journal of High Energy Physics
Miller D
(2014)
Supersymmetric SO(10) grand unification at the LHC and beyond
in Journal of High Energy Physics
Miller D
(2013)
Constraining grand unification using first and second generation sfermions
in Physical Review D
Monahan C
(2012)
Matching heavy-light currents with NRQCD and HISQ quarks
Monteiro R
(2014)
Black holes and the double copy
in Journal of High Energy Physics
Monteiro R
(2015)
Gravity as a double copy of gauge theory: from amplitudes to black holes
in International Journal of Modern Physics D
Moortgat-Pick G
(2013)
Helmholtz Alliance Linear Collider Forum
in Phys.Rev.
Na H
(2011)
D ? p , l ? semileptonic decays, | V c d | and second row unitarity from lattice QCD
in Physical Review D
Na H
(2012)
B and B s meson decay constants from lattice QCD
in Physical Review D
Na H
(2012)
| V c d | from D meson leptonic decays
in Physical Review D
Description | We have performed a number of ground-breaking computations of the properties of hadrons from the theory of the strong interaction along with studies of signals at the Large Hadron Collider that can be used to test the Standard model of particle physics. |
Exploitation Route | Our findings are regularly used by experimental particle physicists and other theoretical particle physicists in their analyses and for their calculations. |
Sectors | Education |
URL | http://www.physics.gla.ac.uk/ppt |
Description | White's work on gravity led to a realisation that the action of a type of refracting sheet (a generalised confocal lenslet array) could be described using the language of metric tensors and differential geometry. This has simplified the design of new optical devices, including spectacles for retinal disorders. Ongoing work with Durham and Sunderland Eye Infirmary may lead to commercialisation. |
First Year Of Impact | 2014 |
Sector | Manufacturing, including Industrial Biotechology |
Impact Types | Economic |
Description | Deisa Extreme Computing Initiative |
Amount | £100,000 (GBP) |
Organisation | European Commission |
Sector | Public |
Country | European Union (EU) |
Start | 10/2010 |
End | 05/2011 |
Description | High Performance Computing Grant |
Amount | £500,000 (GBP) |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 11/2009 |
End | 10/2012 |
Description | HPQCD collaboration |
Organisation | University of Cambridge |
Department | Department of Applied Mathematics and Theoretical Physics (DAMTP) |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | We did the numerical simulations |
Collaborator Contribution | We have done numerical simulations of QCD using information provided from the mathematical calculations done in Cambridge |
Impact | several publications and grants for computer time in the USA. |
Description | particle physics masterclass |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | No |
Geographic Reach | National |
Primary Audience | Schools |
Results and Impact | The particle physics masterclass runs very year - typically around 130 pupils from 30 schools across Scotland attend. The class acts as an introduction to particle physics for pupils about to apply to university. |
Year(s) Of Engagement Activity | 2012,2013,2014,2015 |