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
Adamson P
(2013)
Search for flavor-changing non-standard neutrino interactions by MINOS
in Physical Review D
Adelman J
(2013)
NLO QCD corrections to tW ' and tZ ' production in forward-backward asymmetry models
in Journal of High Energy Physics
Athron P
(2012)
Constrained exceptional supersymmetric standard model with a Higgs signal near 125 GeV
in Physical Review D
Athron P
(2011)
LHC signatures of the constrained exceptional supersymmetric standard model
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
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
Bailey JA
(2012)
Refining new-physics searches in B?Dt? with lattice QCD.
in Physical review letters
Bali G
(2013)
Mesons in large-N QCD
in Journal of High Energy Physics
Barr A
(2014)
Di-Higgs final states augMT2ed - Selecting hh events at the high luminosity LHC
in Physics Letters B
Barrett J
(2010)
Asymptotics of 4d spin foam models
in General Relativity and Gravitation
Bazavov A
(2013)
Leptonic-decay-constant ratio f(K+)/f(p+) from lattice QCD with physical light quarks.
in Physical review letters
Bazavov A
(2012)
B - and D -meson decay constants from three-flavor lattice QCD
in Physical Review D
Bazavov A
(2013)
Kaon semileptonic vector form factor and determination of | V u s | using staggered fermions
in Physical Review D
Bazavov A
(2013)
Lattice QCD ensembles with four flavors of highly improved staggered quarks
in Physical Review D
Bazavov A
(2012)
Neutral B -meson mixing from three-flavor lattice quantum chromodynamics: Determination of the S U ( 3 ) -breaking ratio ?
in Physical Review D
Bazavov, A. And Bernard, C. And DeTar, C. And Foley, J. And Freeman, W. And Others
(2013)
Leptonic decay-constant ratio $f_{K^+}/f_{\pi^+}$ from lattice QCD with physical light quarks
Beringer J
(2012)
Review of Particle Physics
in Physical Review D
Bernard C
(2012)
B-mixing in the standard model and beyond: Lattice QCD
Bernard C
(2013)
Electromagnetic contributions to pseudoscalar masses
Bernard C
(2011)
Tuning Fermilab heavy quarks in 2 + 1 flavor lattice QCD with application to hyperfine splittings
in Physical Review D
Bharucha A
(2013)
Implications of LHCb measurements and future prospects
in The European Physical Journal C
Blum T
(2015)
K ? p p ? I = 3 / 2 decay amplitude in the continuum limit
in Physical Review D
Bonocore D
(2015)
The method of regions and next-to-soft corrections in Drell-Yan production
in Physics Letters B
Bonocore D
(2015)
A factorization approach to next-to-leading-power threshold logarithms
in Journal of High Energy Physics
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
Buckley A
(2015)
Global fit of top quark effective theory to data
in Physical Review D
Bursa F
(2014)
Lattice string field theory: the linear dilaton in one dimension
in Journal of High Energy Physics
Campbell J
(2015)
Next-to-leading order predictions for W W + jet production
in Physical Review D
Chakraborty B
(2014)
Strange and charm quark contributions to the anomalous magnetic moment of the muon
in Physical Review D
Chakraborty B
(2015)
High-precision quark masses and QCD coupling from n f = 4 lattice QCD
in Physical Review D
Chakraborty Bipasha
(2016)
The hadronic vacuum polarization contribution to $a_{\mu}$ from full lattice QCD
in ArXiv e-prints
Chakraborty, Bipasha And Davies, C.T.H. And Donald, G.C. And Dowdall, R.J. And Koponen, J. And Others
(2014)
The strange and charm quark contributions to the anomalous magnetic moment of the muon
Chkareuli J
(2011)
Spontaneously generated tensor field gravity
in Nuclear Physics B
Choi S
(2013)
Multiple Higgs-portal and gauge-kinetic mixings
in The European Physical Journal C
Chung C
(2011)
An alternative subtraction scheme for next-to-leading order QCD calculations
in Journal of High Energy Physics
Colquhoun B
(2015)
B -meson decay constants: A more complete picture from full lattice QCD
in Physical Review D
Colquhoun B
(2016)
B ? p l ? at zero recoil from lattice QCD with physical u / d quarks
in Physical Review D
Coumbe D
(2012)
Exploring the Phase Diagram for Lattice Quantum Gravity
Craig N
(2013)
New probe of naturalness.
in Physical review letters
Daldrop JO
(2012)
Prediction of the bottomonium D-wave spectrum from full lattice QCD.
in Physical review letters
DAS C
(2012)
NEW BOUND STATES OF HEAVY QUARKS AT LHC AND TEVATRON
in International Journal of Modern Physics A
Datta S
(2016)
Using Wilson flow to study the SU(3) deconfinement transition
in Physical Review D
Datta S
(2015)
Wilson flow with naive staggered quarks
in Physical Review D
Davies C
(2015)
Neutral B-meson mixing with physical u, d, s, and c sea quarks
Davies C
(2014)
Bottomonium results from lattice QCD
Davies C
(2012)
Standard Model Flavor physics on the Lattice
Davies, C.
(2013)
Determination of c and b quark masses
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 |