Gordon Research Seminar in Particle Physics: Pushing the Frontiers of Particle Physics During the LHC Run II Era

Session

The "energy frontier”: LHC and future colliders

24 Jun 2017, 19:30

Hong Kong University of Science and Technology (HKUST)

Conveners

The "energy frontier”: LHC and future colliders: The "energy frontier”: LHC and future colliders

• Brian Shuve
• Felix Yu
• Roberto Rranceschini

Description

This session will be devoted to the search for New Physics at the high energy frontier (LHC and future colliders). We aim to bring together bright young minds from experiment and theory (model building as well as phenomenology) to foster a fruitful discussion about the potential to discover New Physics at colliders, including Dark Matter, Supersymmetry and other New Physics ideas that can be tested in high energy collisions.

22. Higgs Boson Properties with ATLAS in (H -> ZZ*)

Ki Lie

24/06/2017, 19:30

23. Exploring the DNN Performance in Jet Physics

Taoli Cheng

24/06/2017, 19:45

Since the machine learning techniques are improving rapidly, it has been shown that the image recognition technique can be used to detect jet substructure. And it turns out that deep neural networks can match or outperform traditional approach. To push it further, we investigate the Recursive Neural Networks (RecNN), which embeds jet clustering history recursively as in natural language...

24. Disassembling the clockwork mechanism

David Sutherland

24/06/2017, 20:00

The original clockwork theories (1511.00132 and 1511.01827) comprise an N-site quiver of N axions, with symmetry breaking interactions arranged between them to leave a single massless mode with exponentially suppressed and (lattice) position dependent couplings to different sites. We study both clockwork's group-theoretic generalisation to quivers with different symmetry groups, and also its...

25. top-quark mass from diphoton mass spectrum

Hiroshi Yokoya

24/06/2017, 20:15

We calculate the $gg\to\gamma\gamma$ amplitude by including the $t\bar t$ bound-state effects near their mass threshold. In terms of the non-relativistic expansion of the amplitude, the LO contribution is an energy-independent term in the one-loop amplitude. We include the NLO contribution described by the non-relativistic Green function and part of the NNLO contribution. Despite a missing NLO...

26. Testing Naturalness

Jan Hajer

24/06/2017, 20:30

Solutions to the electroweak hierarchy problem typically introduce a new symmetry to stabilize the quadratic ultraviolet sensitivity in the self-energy of the Higgs boson. The new symmetry is either broken softly or collectively, as for example in supersymmetric and little Higgs theories. At low energies such theories contain naturalness partners of the Standard Model fields which are...

27. Testing naturalness through precision measurements

Jeremy Bernon

24/06/2017, 20:45

Symmetry-based solutions of the hierarchy problem generically predict new states to cancel the Standard Model one-loop quadratic divergence of the Higgs mass. Phenomenological investigations are generally focused on the top-partners, expected to be at the TeV scale by naturalness arguments, and with model-dependent quantum numbers. While direct LHC searches have so far turned empty-handed...

28. Quark-gluon discrimination in the search for gluino pair production at the LHC

Yasuhito Sakaki

24/06/2017, 21:00

We study the impact of including quark- and gluon-initiated jet discrimination in the search for strongly interacting supersymmetric particles at the LHC. Taking the example of gluino pair production, considerable improvement is observed in the LHC search reach on including the jet substructure observables to the standard kinematic variables within a multivariate analysis. In particular, quark...

29. Measurement of Correlation between Inclusively Produced Lambda0-anti-Lambda0, Lambda0-Lambda0, and anti-Lambda-anti-Lambda0 Hyperon Pairs at sqrt(s) = 7 TeV in the LHC ATLAS Experiment

Hok Chuen Cheng

24/06/2017, 21:15

We report here measurements of correlations between Lambda0-anti-Lambda0, Lambda0-Lambda0, and anti-Lambda-anti-Lambda0 hyperon pairs produced inclusively at the LHC. The analysis is based on hyperon pairs selected using the muon and minimum bias sample collected at the ATLAS experiment from proton-proton collisions at a center-of-mass energy of 7 TeV in 2010. Dynamical correlations between...