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BEGIN:VEVENT
SUMMARY:Charting the Fifth Force Landscape
DTSTART;VALUE=DATE-TIME:20201216T160000Z
DTEND;VALUE=DATE-TIME:20201216T163000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5035@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hannah Banks (University of Cambridge)\nIn recent ye
ars particle physics research has undergone somewhat of a phase transition
\, looking increasingly towards hidden sectors and the feebly interacting
frontier. In this talk I will introduce a new approach to parameterising d
ark sector forces\, underpinned by the Källén-Lehman representation\, in
which the effects of any general scalar fifth force are captured by a sin
gle positive-definite spectral function. Using this language\, I will demo
nstrate how the effects of loop-level forces can be simply obtained\, with
out needing to explicitly perform loop calculations. I will also show how
experimental observables can be expressed in completely general terms\,
facilitating the straightforward extraction of limits to any specific mode
l. Finally\, I will discuss how this framework opens the possibility to sp
eculatively probe violations of unitarity\, causality or locality within h
idden sectors.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contribution
s/5035/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5035/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological implications of EW vacuum instability: constraints on
the Higgs curvature coupling from inflation
DTSTART;VALUE=DATE-TIME:20201216T153000Z
DTEND;VALUE=DATE-TIME:20201216T160000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5050@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andreas Mantziris (Imperial College London)\nThe cur
rent experimentally measured parameters of the Standard Model (SM) suggest
that our universe lies in a metastable electroweak vacuum\, where the Hig
gs field could decay to a lower vacuum state with catastrophic consequence
s. Our measurements dictate that such an event has not happened yet\, desp
ite the many different mechanisms that could have triggered it during our
past light-cone. Via this observation\, we can establish a promising link
between cosmology and particle physics and thus constrain important parame
ters of our theories. The focus of our work has been to explore this possi
bility by calculating the probability of the false vacuum to decay during
the period of inflation and using it to constrain the last unknown renorma
lisable SM parameter $\\xi$\, which couples the Higgs field with space-tim
e curvature. In our latest study\, we derived lower bounds for the Higgs-c
urvature coupling from vacuum stability in three inflationary models: quad
ratic and quartic chaotic inflation\, and Starobinsky-like power-law infla
tion. In contrast to most previous studies we took the time-dependence of
the Hubble rate into account both in the geometry of our past light-cone a
nd in the Higgs effective potential\, which is approximated with three-loo
p renormalisation group improvement supplemented with one-loop curvature c
orrections. We find that in all three models\, the lower bound is $\\xi \\
geq 0.051 ... 0.066$ depending on the top quark mass. We also demonstrated
that vacuum decay is most likely to happen a few e-foldings before the en
d of inflation.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributio
ns/5050/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5050/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy $\\to$ strange Semileptonic Decays in Lattice QCD
DTSTART;VALUE=DATE-TIME:20201216T143000Z
DTEND;VALUE=DATE-TIME:20201216T150000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5032@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: William Parrott (University of Glasgow)\n$D \\to{}K
l \\nu$ and $B \\to K l^+l^-$ are important heavy to strange semileptonic
decay processes\, giving us direct comparison with experiment\, and access
to CKM matrix elements and potential new physics.\nWe can calculate form
factors for both of these processes in lattice QCD and connect them togeth
er by determining heavy to strange form factors for heavy quark masses ran
ging from $c$ to $b$. We can also explore the connection to form factors w
ith different light quark masses.\nUsing the HISQ action on $N_f=2+1+1$\,
we demonstrate how $D\\to{}K$ calculations can be extended up towards the
$b$ mass and give preliminary $D \\to{} K$ and $B \\to {}K$ results\, in b
oth cases including results for the tensor form factor with an accurately
renormalised tensor current.\n\nhttps://conference.ippp.dur.ac.uk/event/93
7/contributions/5032/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5032/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precise Determination of CKM Matrix Elements with Lattice QCD+QED
DTSTART;VALUE=DATE-TIME:20201216T140000Z
DTEND;VALUE=DATE-TIME:20201216T143000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5036@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Yong (University of Edinburgh)\nThe Cabibbo-K
obayashi-Maskawa (CKM) matrix is a $3\\times 3$ unitary matrix in the Stan
dard Model of particle physics. In the age of precision physics\, one of t
he ongoing efforts to extend the Standard Model is to test the unitarity o
f the CKM matrix. This requires a precise determination of its matrix elem
ents from first principles. Since quarks hadronise into bound states at $E
\\approx \\Lambda_{QCD}\\sim 300$MeV\, we will require a non-perturbative
approach to obtain theoretical predictions of hadronic observables. This i
s where Lattice QCD(+QED) comes in. In this talk\, I will present the prog
ress made by the RBC-UKQCD collaboration in determining $\\frac{V_{us}}{V_
{ud}}$ and discuss our future plans on extracting the individual matrix el
ements.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5036/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5036/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite Fields for Di-Photon Amplitudes
DTSTART;VALUE=DATE-TIME:20201216T123000Z
DTEND;VALUE=DATE-TIME:20201216T130000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5022@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Sarandrea (Durham University)\nIn this tal
k I will present the algorithms and techniques employed to efficiently obt
ain analytic expressions for loop-induced di-photon amplitudes at 5 and 6
legs . I will review the method of reconstruction over finite fields and h
ow it is applied to OPP integrand reduction at one loop. The representa
tion of the amplitudes using Momentum Twistor variables\, which ensure tha
t the process only involves rational expressions at every intermediate ste
p\, will be introduced. I will discuss advantages and current bottlenecks.
\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5022/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5022/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Getting a number out of a QCD amplitude
DTSTART;VALUE=DATE-TIME:20201216T120000Z
DTEND;VALUE=DATE-TIME:20201216T123000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5039@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryan Moodie (IPPP\, Durham University)\nI will give
an introductory review of modern methods to compute QCD amplitudes in the
context of hadron collider phenomenology. We will build up the basic struc
ture of such calculations and explore the technologies used at each step.\
n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5039/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5039/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An analytical look at top tagging with N-subjettiness
DTSTART;VALUE=DATE-TIME:20201216T110000Z
DTEND;VALUE=DATE-TIME:20201216T113000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5049@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jack Helliwell (University of Manchester)\nI will ex
amine the effectiveness and resilience to non perturbative effects of vari
ous top tagging procedures which make use of n-subjettiness\, initially us
ing Monte Carlo simulations. I will then present resummed calculations\, a
t modified leading log accuracy\, of the most effective variants of these
taggers for both the signal and background. These calculations will then b
e used to understand the physics which drives these taggers\, ultimately f
acilitating the simplification of them whilst improving the performance ov
er a range of signal efficiencies.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/937/contributions/5049/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5049/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The performance and IRC safety of Spectral Clustering when Jet tag
ging.
DTSTART;VALUE=DATE-TIME:20201216T103000Z
DTEND;VALUE=DATE-TIME:20201216T110000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5034@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Henry Day-Hall (University of Southampton)\nSpectral
clustering\, developed by the machine learning community\, has been seen
to be a powerful and versatile clustering method. Jet clustering\, particu
larly in the case of a boosted topology\, is a key problem for particle id
entification in experimental physics. If spectral clustering can be shown
to be suitable for the task it may be able to extract more information fro
m the data we generate.\n\nA key factor for the suitability of an clusteri
ng algorithm is infrared and collinear (IRC) safety. While there are algor
ithms that are not IRC safe\, the most popular algorithms are. To be viabl
e for use in QCD calculations the jet formation algorithm must be IRC safe
.\n\nIn this talk I will discuss the mechanics\, performance and the IRC s
afety of spectral clustering.\n\nhttps://conference.ippp.dur.ac.uk/event/9
37/contributions/5034/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5034/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a Quantum Computing Algorithm for Helicity Amplitudes and
Parton Showers
DTSTART;VALUE=DATE-TIME:20201216T100000Z
DTEND;VALUE=DATE-TIME:20201216T103000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5044@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Khadeejah Bepari (IPPP\, Durham University)\nThe int
erpretation of measurements of high-energy particle collisions relies heav
ily on the performance of full event generators. By far the largest amount
of time to predict the kinematics of multi-particle final states is dedic
ated to the calculation of the hard process and the subsequent parton show
er step. With the continuous improvement of quantum devices\, dedicated al
gorithms are needed to exploit the potential quantum computers can provide
. In this talk I will discuss general and extendable algorithms for quantu
m gate computers to facilitate calculations of helicity amplitudes and the
parton shower process\, as a first step towards a quantum computing algor
ithm to describe the full collision event at the LHC. This method exploits
the equivalence between spinors and qubits and harnesses the quantum comp
uter’s ability to remain in a quantum state throughout the calculations.
\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5044/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5044/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soft Anomalous Dimension in QCD
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T163000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5011@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Niamh Maher (University of Edinburgh)\nAn introducti
on to the Soft Anomalous Dimension in QCD with a focus on the diagrammatic
color structures that appear in it. The factorisation of scattering ampli
tudes into hard\, soft and jet parts allows us to focus on the soft matrix
. The Soft Anomalous Dimension contains the IR singularities and can be re
presented in terms of Wilson lines which will be discussed.\n\nhttps://con
ference.ippp.dur.ac.uk/event/937/contributions/5011/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5011/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Instantons at hadron colliders
DTSTART;VALUE=DATE-TIME:20201215T153000Z
DTEND;VALUE=DATE-TIME:20201215T160000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5019@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Milne (IPPP\, Durham University)\nInstantons
are non-perturbative phenomena arising in field theory with degenerate vac
ua. They are one of the few remaining predictions of the Standard Model th
at has not been experimentally observed. Discovering instantons at a colli
der would be another piece of evidence for our current model of QCD and he
lp to understand the vacuum structure of the standard model.\n\nWe will di
scuss the most recent calculation of the instanton cross section at hadron
colliders before moving on to discuss their collider signature. We talk a
bout shape variables as possible discriminating variables and how we might
potentially discover instantons at the LHC. \n\n[talk based on https://ar
xiv.org/abs/2010.02287]\n\nhttps://conference.ippp.dur.ac.uk/event/937/con
tributions/5019/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5019/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine Learning Surrogates for Rapid Dark Matter Direct Detection
Calculations
DTSTART;VALUE=DATE-TIME:20201215T140000Z
DTEND;VALUE=DATE-TIME:20201215T143000Z
DTSTAMP;VALUE=DATE-TIME:20211023T004449Z
UID:indico-contribution-1192-5052@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Dorian Amaral (IPPP\, Durham University)\nDark matte
r direct detection is one of the most popular ways of searching for WIMP d
ark matter. However\, the calculations involved when evaluating the recoil
spectra can be expensive\, especially when exploring the multi-dimensiona
l parameter space resulting from the EFT description of dark matter and th
e inclusion of astrophysical uncertainties. Therefore\, it is instructive
to seek ways of accelerating this calculation. We explore the performance
of several possible surrogate models which can replace the exact calculati
on\, with a focus on machine learning models. We find that relatively simp
le surrogate models can adequately approximate the complete calculation wi
th a sizeable jump in performance.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/937/contributions/5052/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5052/
END:VEVENT
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