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
Barrett J
(2010)
Asymptotics of 4d spin foam models
in General Relativity and Gravitation
Dowdall R
(2010)
Observables in 3d spinfoam quantum gravity with fermions
in General Relativity and Gravitation
Gardi E
(2011)
On the renormalization of multiparton webs
in Journal of High Energy Physics
Na H
(2011)
D ? p , l ? semileptonic decays, | V c d | and second row unitarity from lattice QCD
in Physical Review D
Athron, P. And Hall, J.P. And King, S.F. And Moretti, S. And Miller, D.J. And Others
(2011)
Collider phenomenology of the $E_6SSM$
in Proceedings of DPF2011
Chung C
(2011)
An alternative subtraction scheme for next-to-leading order QCD calculations
in Journal of High Energy Physics
Laiho J
(2011)
Light flavors on the lattice
Del Duca V
(2011)
The infrared structure of gauge theory amplitudes in the high-energy limit
in Journal of High Energy Physics
Chkareuli J
(2011)
Spontaneously generated tensor field gravity
in Nuclear Physics B
Laiho J
(2011)
Evidence for asymptotic safety from lattice quantum gravity.
in Physical review letters
Gregory E
(2011)
Precise B , B s , and B c meson spectroscopy from full lattice QCD
in Physical Review D
Dowdall R
(2011)
Wilson loops, geometric operators and fermions in 3d group field theory
in Open Physics
White, Chris D.
(2011)
New Results in Soft Gluon Physics
in Proceedings of Rencontre de Moriond
Donald G
(2011)
Staggered fermions, zero modes, and flavor-singlet mesons
in Physical Review D
White C
(2011)
Factorization properties of soft graviton amplitudes
in Journal of High Energy Physics
Bernard C
(2011)
Tuning Fermilab heavy quarks in 2 + 1 flavor lattice QCD with application to hyperfine splittings
in Physical Review D
Gardi E
(2011)
General properties of multiparton webs: proofs from combinatorics
in Journal of High Energy Physics
Laiho, Jack And Pecjak, Ben D. And Schwanda, Christoph
(2011)
CKM2010 Working Group II Summary
Del Duca, Vittorio And Duhr, Claude And Gardi, Einan And Magnea, Lorenzo And White, Chris D.
(2011)
Infrared Singularities and the High-Energy Limit
in Proceedings of RADCOR 2011
Robens, Tania And Chung, Cheng Han And Kramer, Michael
(2011)
An Alternative subtraction scheme for NLO calculations
in Proceedings of Moriond11
Athron P
(2011)
LHC signatures of the constrained exceptional supersymmetric standard model
in Physical Review D
Laenen E
(2011)
Next-to-eikonal corrections to soft gluon radiation: a diagrammatic approach
in Journal of High Energy Physics
Kraml S
(2012)
Searches for new physics: Les Houches recommendations for the presentation of LHC results
in The European Physical Journal C
Davies, Christine
(2012)
Determination of c and b quark masses
in Proceedings of CKM 2012, in press
Kim J
(2012)
Two-point correlator fits on HISQ ensembles
Van De Water R
(2012)
Pion and kaon decay constants and B_K from mixed-action lattice QCD
Donald G
(2012)
Precision tests of the J / ? from full lattice QCD: Mass, leptonic width, and radiative decay rate to ? c
in Physical Review D
Hornbostel K
(2012)
Fast fits for lattice QCD correlators
in Physical Review D
Miller D
(2012)
Gravitational cusp anomalous dimension from AdS space
in Physical Review D
McNeile C
(2012)
Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD
in Physical Review D
Bailey J
(2012)
B s ? D s / B ? D semileptonic form-factor ratios and their application to BR ( B s 0 ? µ + µ - )
in Physical Review D
White C.D.
(2012)
New insights into soft gluons and gravitons
in Proceedings of Science
DAS C
(2012)
NEW BOUND STATES OF HEAVY QUARKS AT LHC AND TEVATRON
in International Journal of Modern Physics A
Kronfeld A
(2012)
The 't Hooft vertex for staggered fermions and flavor-singlet mesons
Toussaint D
(2012)
Pseudoscalar meson physics with four dynamical quarks
Athron P
(2012)
Constrained exceptional supersymmetric standard model with a Higgs signal near 125 GeV
in Physical Review D
Na H
(2012)
B and B s meson decay constants from lattice QCD
in Physical Review D
Brooijmans, G. And Gripaios, B. And Moortgat, F. And Santiago, Jose And Skands, P. And Others
(2012)
Les Houches 2011: Physics at TeV Colliders New Physics Working Group Report
Na H
(2012)
| V c d | from D meson leptonic decays
in Physical Review D
Bernard C
(2012)
B-mixing in the standard model and beyond: Lattice QCD
Beringer J
(2012)
Review of Particle Physics
in Physical Review D
Robens T
(2012)
$ {\sqrt { {\widehat{s}}}_{\min }} $ resurrected
in Journal of High Energy Physics
FROGGATT C
(2012)
DARK ENERGY DENSITY IN MODELS WITH SPLIT SUPERSYMMETRY AND DEGENERATE VACUA
in International Journal of Modern Physics A
Froggatt, C.D. And Das, C.R. And Laperashvili, L.V. And Nielsen, H.B.
(2012)
New indications of the existence of the 6 top-anti-top quark bound states in LHC experiments
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 |