Non-conventional searches at the LHC (IBS-CTPU Focused workshop)

Asia/Seoul
IBS-CTPU

IBS-CTPU

Lecture Building, KAIST Munji Campus, Daejeon, South Korea
Description

The Synergy from collaborations between theorists and experimentalist in the BSM searches

With TeV Energy scale collider experiments, we are facing unexpected difficulties in the search of the physics beyond the Standard Model, mostly coming from uncertainties in the behavior of QCD. We are also limited to a finite number of modelings of BSM through conventional searches at the LHC. 

So far, searches motivated from CMSSM, Simplified models, crossing with Dark matter direct searches (mono-X) have been populated in HEP society. But Collider searches should not be restricted by models that we know well about. 

Challenges from TeV Energy scale phenomena can be solved only based on the intensive discussions between BSM theory community and experimental collaborations.

This focused workshop is designed to boost synergy from collaborated efforts between HEP-PH and CMS/ATLAS groups, and to maximize the chance of discoveries with Future colliders including the LHC. 

Our main topics to be discussed are following, 

  • Search strategies in BSM hunting
  • Issues of non-conventional signatures (and related BSM) at Colliders
  • Reducing corruptions from QCD activities
  • Adapting Monte Carlo simulations to non-conventional searches

Invited speakers : 

  • HEP-PH
    • K.C. Kong (University of Kansas)
    • Hyun Min Lee (Chung-Ang University)
    • Seung J. Lee (Korea University)
    • Ian Lewis (SLAC)
    • Adam Martin (University of Notre Dame)
    • Seongchan Park (Yonsei Unversity)
    • Jeonghyeon Song (KonKuk University)
    • Felix Yu (University Mainz)
    • Yuhsin Tsai (Maryland University)
    • Doojin Kim (University of Florida)
    • Ken Mimasu (University of Sussex)
    • Chengcheng Han (Kavli IPMU)
       
  • HEP-EX
    • Jae-Hyeok Yoo (CMS, UC Santa Barbara)
    • Enrique Kajomovitz (ATLAS, Duke University)
       
  • HEP-MC​
    • Nicolas Greiner (University of Zurich)

Organizers 


Sponsored by

  

Participants
  • Adam Martin
  • Andrew Spray
  • Chengcheng Han
  • Doh Young Mo
  • Doojin Kim
  • Doyoun Kim
  • Enrique Kajomovitz
  • Felix Yu
  • Hwidong Yoo
  • Hyun Min Lee
  • Ian Lewis
  • Jae-Hyeok Yoo
  • Jeong Han Kim
  • Jeonghyeon Song
  • Jong-Chul Park
  • K.C. Kong
  • Ken Mimasu
  • Manoj Mandal
  • Minho Kim
  • Myeonghun Park
  • Nicolas Greiner
  • Sanghyeon Chang
  • Seodong Shin
  • Seongchan Park
  • Seung Joon Lee
  • Sezen Sekmen
  • Sung Hak Lim
  • Tae Hyun Jung
  • Won Sang Cho
  • Yang-Hwan Ahn
  • Yu Hsin Tsai
    • 09:30 11:30
      Plenary Session
      • 09:30
        Introduction 30m
        Speaker: Dr Park Myeonghun (IBS-CTPU)
      • 10:00
        New directions in SUSY searches 1h
        This talk will focus on the topic of new directions in SUSY searches and discuss new ideas about how to search for SUSY at LHC.
        Speaker: Dr Seen Sekmen
        Slides
    • 11:30 13:00
      Lunch
    • 14:00 16:00
      Plenary Session
      • 14:00
        The Coannihilation Codex 1h
        We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X $\rightarrow$ SM$_1$ + SM$_2$, where X is a coannihilation partner for the DM particle and SM$_1$, SM$_2$ are Standard Model fields. Our classification also encompasses regular DM pair annihilation scenarios if DM and X are identical. Each coannhilation scenario motivates the introduction of a mediating particle M that can either belong to the Standard Model or be a new field, whereby the resulting interactions between the dark sector and the Standard Model are realized as tree-level and dimension-four couplings. We construct a basis of coannihilation models, classified by the $SU(3)_C \times SU(2)_L \times U(1)_Y$ quantum numbers of DM, X and M. Our main assumptions are that dark matter is an electrically neutral color singlet and that all new particles are either scalars, Dirac or Majorana fermions, or vectors. We illustrate how new scenarios arising from electroweak symmetry breaking effects can be connected to our electroweak symmetric simplified models. We offer a comprehensive discussion of the phenomenological features of our models, encompassing the physics of thermal freeze-out, direct and indirect detection constraints, and in particular searches at the Large Hadron Collider (LHC). Many novel signatures that are not covered in current LHC searches are emphasized, and new and improved LHC analyses tackling these signatures are proposed. We discuss how the coannihilation simplified models can be used to connect results from all classes of experiments in a straightforward and transparent way. This point is illustrated with a detailed discussion of the phenomenology of a particular simplified model featuring leptoquark-mediated dark matter coannihilation.
        Speaker: Dr Felix Yu
        Slides
      • 15:00
        Searching for new physics with Voronoi tessellations 1h
        High energy experimental data can be viewed as a sampling of the relevant phase space. We point out that one can apply Voronoi tessellations in order to understand the underlying probability distributions governing the relevant phenomena. Characteristic features embedded in the data can then be discovered by studying the properties of Voronoi cells. We particularly focus on detecting kinematic "edges", taking the examples of two- and three-dimensional data for concreteness. To this end, we propose algorithms motivated by some analytic results derived for perfect lattices, and show that the relevant methods can be further improved with the addition of a few Voronoi relaxation steps via Lloyd's method.
        Speaker: Dr Doojin Kim
        Slides
    • 16:00 16:30
      Break
    • 16:30 17:10
      Talks
      • 16:30
        Capturing soft signatures @LHC 40m
        Speaker: Dr Chengcheng Han (Kavli IPMU)
    • 17:10 18:00
      Discussion
    • 09:30 11:30
      Plenary Session
      • 09:30
        Searching for high mass Diboson Resonances in ATLAS 1h
        High mass diboson resonances appear in many extensions to the Standard Model. The large dataset of 8 TeV pp collisions collected during the first run of the LHC allowed us to search for these resonances at the TeV scale for the first time. In one of these searches performed by the ATLAS experiment, a small but nevertheless intriguing excess over the background expectation is seen in the region around 2 TeV. We will discuss the ATLAS searches and their corresponding results in detail, including an extended discussion on the techniques used to achieve sensitivity. We will also discuss plans for these searches with the early data from the second run of the LHC.
        Speaker: Dr Enrique Kajomovitz
      • 10:30
        A Consistent Model for Strongly Interacting Massive Particles 1h
        Speaker: Prof. Hyun Min Lee
        Slides
    • 11:30 13:00
      Lunch
    • 14:00 16:00
      Plenary Session
      • 14:00
        Looking for Resonances under the LHC Lamppost 1h
        Speaker: Prof. Kyoungchul Kong
      • 15:00
        BSM physics with GoSam 1h
        Speaker: Dr Nicolas Greiner
    • 16:00 16:30
      Break
    • 16:30 17:40
      Talks
      • 16:30
        Probing TeV Scale New Resonances with Jet Substructure Methods 30m
        Speaker: Mr Jeong Han Kim (KAIST)
        Slides
      • 17:00
        Real and Imaginary interference for a heavy Higgs boson 40m
        Speaker: Prof. Jeonghyeon Song (KonKuk University)
    • 17:40 18:00
      Discussion
    • 18:00 19:30
      Banquet
    • 09:30 11:30
      Plenary Session
      • 09:30
        Conventional and Unconventional SUSY Searches at CMS : Results from the new energy regime, √s=13 TeV 1h
        The LHC has resumed its operation at the new energy regime, √s=13 TeV, which we had never been before. Thanks to the higher energy compared to the Run1, the cross sections for the production of very heavy objects increased dramatically. This brings a huge advantage to the SUSY searches at the LHC. The CMS carried out some of the conventional SUSY searches using the new data and their results will be discussed in the first half of the talk. In addition, a new analysis has been performed using the scalar sum of masses of the large-radius jets. The rest half of the talk will discuss this analysis in detail.
        Speaker: Dr Jae Hyeok Yoo
        Slides
      • 10:30
        Techniques for finding electroweakinos 1h
        Speaker: Prof. MARTIN Adam
        Slides
    • 11:30 13:00
      Lunch
    • 14:00 15:00
      Plenary Session
      • 14:00
        The Quantum Critical Higgs 1h
        Speaker: Prof. Seung Joon Lee (Korea University)
        Slides
    • 15:00 16:00
      Talks
      • 15:00
        Threshold corrections at third order in QCD for Higgs production at the LHC 30m
        Speaker: Mr Manoj Mandal
      • 15:30
        Signals of vectorlike leptons in a heavy Higgs cascade decay 30m
        Speaker: Dr Seodong Shin
        Slides
    • 16:00 16:30
      Break
    • 16:30 17:30
      Discussion
    • 09:30 11:30
      Plenary Session
      • 09:30
        New Physics Under the Higgs Lampost 1h
        WIth the discovery of a Higgs boson, the Standard Model of particle physics is complete. Due to its nature as the source of electroweak symmetry breaking in the Standard Model and its loop induced production at hadron colliders, measurements of the HIggs boson can provide particular insight into beyond the Standard Model physics. In this talk I will give an overview of what can be learned from these measurements, with a particular focus on double Higgs and Higgs plus jet production.
        Speaker: Prof. Ian Lewis
        Slides
      • 10:30
        Exotic Signals in Twin Higgs Model 1h
        Twin Higgs (TH) model gives a naturalness motivation to study the non-colored BSM particles, which usually have decay processes relating to the dark-hadronization and displaced signal. In this talk, I will use the exotic twin-quarks to discuss the search of these decays. The exotic-quarks play a vital role in UV completing the TH model, and their decay products contain both SM particles and twin-hadrons, including twin-glueballs, mesons, and leptons. These twin-objects decay displacedly into SM b-quarks or leptons, and the striking signal allows the reach of twin UV-physics at the LHC and future collider. Interesting complimentarily constraints between collider and astrophysical search will also be discussed.
        Speaker: Dr Yu Hsin Tsai
        Slides
    • 11:30 13:00
      Lunch
    • 14:00 15:20
      Talks
      • 14:00
        The hierarchical two Higgs doublet model: probing the electroweak phase transition at the LHC 40m
        Speaker: Dr Ken Mimasu
        Slides
      • 14:40
        Searching for Di-Higgs Production via Topological Augmentation 40m
        Speaker: Dr Wonsang Cho
    • 15:20 15:50
      Break
    • 15:50 17:00
      Discussion
    • 10:30 11:30
      Discussion
    • 11:30 12:30
      Lunch