Supersymmetry: from M-theory to the LHC

10 Jan 2016, 18:00 → 12 Jan 2016, 16:00 Europe/London

University of Kent

We aim to bring together young researchers from across SEPnet and the UK whose work is related to SUSY. This includes theoreticians, model builders, and phenomenologists working on BSM physics, astrophysics and cosmology, and experimentalists involved or interested in SUSY searches at the LHC. By covering a range of related topics from pure theory, including links to astrophysics and cosmology, all the way through to experimental searches, this workshop will allow all participants to widen their physics knowledge and broaden their experience. Focusing on SUSY will also allow students to gain a deeper understanding of this topic, allowing them to advance their own physics research. Researchers will have the chance to communicate their research, and the hope is that this conference will be an opportunity for generating new ideas and new collaborations. The workshop will contain four overview talks covering the status of supersymmetry from phenomenological, model building, theoretical, and experimental point of views. The remaining talks will be given mainly by PhD students (could include postdoctoral researchers as well). These talks will be divided according to subject into three sessions (theory, phenomenology, experiment). Confirmed keynote speakers: 1. Professor John Ellis (King's College). 2. Professor Steven Abel (Durham). 3. Professor Alan Barr (Oxford). 4. Professor Steve King (Southampton). Organisers: Maien Binjonaid (Chair) Marc Thomas Chris Harman Russell Kirk Professor Stefano Moretti Sponsor: South East Physics Netword (SEPnet) - www.sepnet.ac.uk Fees: Registration is free of charge as well as accommodation for SEPnet and non-SEPnet PhDs/Postdocs. Travel is covered for SEPnet PhDs/Postdocs only. For information contact: m.c.thomas@soton.ac.uk or m.binjonaid@soton.ac.uk

Evaluation_Form.pdf

Participants_List.pdf

Poster.pdf

Travel_and_Accommodation.pdf

Monday 11 January ¶

09:00 → 09:30 Registration and Coffee¶

09:30 → 10:30 Some ideas beyond vanilla SUSY, and their stringy origins: Steven Abel¶

Susy.2016.pdf

10:30 → 10:50 Coffee

10:50 → 11:20 Supersymmetry and Geometry and Hyperbolic Monopoles: Moustafa Gharamti¶

Hyperbolic monopoles are solutions of the Bogomol’nyi equations on three-dimensional
hyperbolic space. These equations are natural reduction of the self-duality equations for
Yang-Mills fields in four-dimensional euclidean space. I will present the construction of a
supersymmetric Yang-Mills theory on hyperbolic space, identify hyperbolic monopoles as
supersymmetric configurations and will show how supersymmetry determines the geometry
of the moduli space of hyperbolic monopoles.

Kent talk (Moustafa).pdf

11:20 → 11:45 F-Theory GUTs and Discrete Symmetry: Andrew Meadowcroft¶

F-Theory provides an interesting platform for motivating both GUT groups and discrete
symmetries. In the work presented, we show that in an SU(5) × D4 model with a geometric
R-parity, it is possible to build models that exhibit no proton decay, but baryon number
violation in the form of neutron-antineutron oscillations.

A.Meadowcroft.pdf

11:45 → 12:05 Quantum Gravity using SUSY as a formal device: Anthony Preston¶

I will present working towards a manifestly diffeomorphism invariant Exact Renormalization Group. Based on a generalization of the Polchinski flow equation, this is a method to study quantum gravity without fixing a gauge. It has both fixed-background and background-independent versions. Supersymmetry enters the formalism as a method of regularization. This is similar to Parisi-Sourlas supersymmetry in statistical field theory, which I will also outline.

QuantumGravitySUSY.pdf

12:05 → 12:30 M-Theory at the LHC: Miguel Crispim Romao¶

String Theory has been proven to be an important guide in constructing (semi-)realistc
supersymmetric models of particle physics. While most recognise the results from Heterotic
String theories, strongly coupled and non-perturbative (more general) formulations, such as
F and M theories, have recently provided an exciting new branch of String Phenomenology.
In this communication we will review how and why Supersymmetry arises in String/M theory,
providing an introduction to some terminology and concepts for non-string phenomenologists.
Afterwards, we will show how M Theory compactified on G2 manifolds provide all the
ingredients for model building and a yet-much-unexplored territory. In doing so we will
present the so-called G2-MSSM, an SU(5) class of models with the MSSM spectrum, before
presenting the most recent developments on SO(10) SUSY GUTs arising from M Theory on
G2 manifolds.

CrispimRomao.pdf

12:30 → 14:00 Lunch¶

14:00 → 15:00 Experimental Overview: Alan Barr¶

2016-Canterbury-2.pdf

15:00 → 15:30 Searches for Third Generation Scalar Quarks with the ATLAS Detector: Giuseppe Lerner¶

Supersymmetric theories offer an elegant solution to the naturalness problem of the Standard
Model Higgs, constraining the mass of the superpartners of the third generation quarks,
the stop and the sbottom, to be below the TeV scale. This talk presents the status of the
ATLAS searches for stop and sbottom production in final states containing bottom quarks
and invisible particles. It first presents an overview of the searches that employ the full
statistics of 2012 LHC proton-proton collisions at \sqrt{s} = 8 TeV collected by the ATLAS
detector, including also new results from the \sqrt{s} = 13 TeV collisions data collected during
2015.

GiuseppeLernerThirdGenerationSquarksKENT.pdf

15:30 → 16:00 Coffee¶

16:00 → 17:30 Poster Session with food and drinks¶

with contributions from:
Nicola Louise Abraham
Miguel Crispim Romao
Maria Dimou
Chris Harman
Edward Hughes
Russell Kirk

19:00 → 20:30 Conference Dinner¶

Tuesday 12 January ¶

09:00 → 10:00 SUSY GUTs and Flavour: Steve King¶

King_Kent.compressed.pdf

10:00 → 10:30 Searches for Direct Pair Production of Third Generation Squarks at ATLAS: Dave Lewis¶

Naturalness arguments favour supersymmetric partners of third generation quarks with
masses not too dissimilar to their standard model counterparts. Both top and bottom
squarks with masses of a few hundred GeV can lead to high direct pair production rates
at the LHC. This talk presents a summary of ATLAS results for direct stop and sbottom
pair production using 20/fb of 8 TeV pp collision data, then provides an overview of the
prospects for the 13 TeV data, focusing in particular on the search for hadronic stop decays.

DaveLewis_3GSearch_ATLAS_2.pdf

10:30 → 11:00 Coffee¶

11:00 → 11:30 Electroweak SUSY Searches in Compressed SUSY Scenarios using the 3-Lepton+ETmiss Signature: Yusufu Shehu¶

Final states with three well isolated leptons and large ETmiss are well motivated in the
search for supersymmetry. Compressed supersymmetric spectra, where the mass difference
between the chargino or second lightest neutralino and the lightest supersymmetric particle
is relatively small (10-50 GeV), is an ongoing objective at the Large Hadron Collider (LHC).
Compressed scenarios are explored by selecting 3-lepton events with an additional relatively
hard initial-state radiation (ISR) jet and sizeable missing transverse energy. This permits the
use of softer leptons in the analysis, which is experimentally challenging both for triggering
and the particle reconstruction. The 3-lepton and ISR selection is explored here using Run-1
data delivered by the Large Hadron Collider and recorded with the ATLAS detector. No
significant excess were found above the Standard Model expectations. The new search was
interpreted in terms of 95% confidence-level exclusion limits on the masses of the charginos
and neutralinos. Results are summarised in arXiv:1509.07152.

Yusufu_Kent2016Talk.pdf

11:30 → 12:00 Interpretations of BSM Light Higgs Searches: Robin Aggleton¶

In this talk I will look at recent experimental results searching for light Higgs bosons at the
LHC in the context of supersymmetric models (particularly 2HDM and the NMSSM), and
their implications on these models.

Robin_kent_4tau_12_1_16.pdf

12:00 → 12:30 Current Status of MSSM Higgs Sector and Future Prospects at the HL-LHC: Arghya Choudhury¶

In this work, we search for the regions of the phenomenological minimal supersymmetric
standard model (pMSSM) parameter space in ‘’alignment without decoupling” scenarios.
In such cases one can expect to have moderate Higgs mixing angle () with relatively light
additional Higgses after satisfying the current LHC data. Using the most updated data
(till December 2014) from the LHC and Tevatron experiments, we perform a global fit
analysis. We also consider the constraints coming from the precision measurements of the
rare b-decays: Bs -> μ+μ− and b -> s \ga. We find that low MA (\leq 350) and high tan \be
(\geq 25) regions are disfavored by the combined effect of the global analysis and flavour
data. However, current data still allow regions with Higgs mixing angle \al \sim 0.1 - 0.8. We
then study the existing direct search bounds on the heavy scalar/pseudoscalar (H/A) and
charged Higgs boson (H±) masses and branchings at the LHC. It has been found that regions
with low to moderate values of tan \be with light additional Higgses (mass \leq 600 GeV) are
unconstrained by the data, while the regions with tan \be > 20 are excluded considering the
direct search bounds by the LHC-8 data. The possibility to probe the region with tan \be
\leq 20 at the high luminosity run of LHC are also discussed, giving special attention to the
H -> hh, H/A -> \bar{t} t and H/A -> ø+ø− decay modes.

kent_arghya.pdf

12:30 → 14:00 Lunch¶

14:00 → 14:30 Exploring (g-2)_\mu in the light of a Pati-Salam model with a A_4 × Z_5 Family Symmetry: Patrick Schaefers¶

We explore the potential of the supersymmetric version of the Pati-Salam model with A_4×Z_5
family symmetry to describe present experimental data. We demonstrate that this model,
which was initially developed to describe the neutrino sector, has a great potential to explain
collider and non-collider measurements, such as the dark matter relic density, the Higgs
boson mass and, most importantly, the anomalous magnetic moment of the muon (g − 2)_μ.
The latter one suffers from a puzzling discrepancy at about 3\si level between the theoretical
prediction and the experimental measured value, which the model is able to resolve precisely.
Subsequently, the model predicts light smuons and respective di-muon signatures at the LHC
arising from smuon pair production. We explore these signatures and suggest the respective
benchmarks for further experimental studies.

Patrick-Schaefers-Kent-Pati-Salam.pdf

14:30 → 15:30 Phenomenology Overview: John Ellis¶

Ellis.pdf

15:30 → 16:00 Coffee¶