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COMETA workshop on BSM in Multiboson Processes
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Europe/Sarajevo
Academy of Sciences and Arts of Bosnia and Herzegovina,
Bistrik 7, Sarajevo 71000, Bosnia & Herzegovina
Ilaria Brivio
(University & INFN Bologna),
Valentina Cairo
(CERN),
Amel Duraković
(University of Sarajevo),
Admir Greljo
(Universitaet Basel (CH)),
Ramona Groeber
(Università di Padova and INFN, Sezione di Padova),
Suad Krilašević,
Senad Odzak,
Alejo Nahuel Rossia
(University of Padua and INFN Sezione di Padova),
Nudžeim Selimović
(INFN Padova),
Mirsad Tunja
(University of Sarajevo)
Description
This workshop, organized under the umbrella of the COMETA COST Action, will gather theorists and experimentalists exploring multiboson processes as a window to new physics beyond the Standard Model. The program will highlight recent theoretical developments in new physics model building and effective field theories, precision calculations, novel experimental strategies, and machine learning techniques to enhance BSM sensitivity in processes with multiboson states. Building on these themes, the agenda will feature plenary presentations, contributed talks, and a dedicated discussion session designed to provide space for constructive feedback between theorists and experimentalists.
Registration
Registration
Participants
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08:30
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09:15
Registration
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09:15
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09:25
Welcome and introduction
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09:25
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09:55
Opening session
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09:25
CP Violation Beyond the Standard Model: A Bosonic Perspective 30mSpeaker: Rui Santos (ISEL and CFTC-UL)
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09:25
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09:55
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10:45
Effective Field Theory
- 09:55
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10:20
The Geometry of Unitarity Bounds in Effective Field Theories 25mSpeaker: Luigi C. Bresciani (University of Padova & INFN-PD)
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10:45
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11:15
Coffee break
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11:15
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12:35
Effective Field Theory
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11:20
Multi boson processes in EFTs from on-shell amplitude techniques 25mSpeaker: Michal Jakub Ryczkowski (Università di Padova and INFN, Sezione di Padova)
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11:45
The inseparable three and four tops 25mSpeaker: Gauthier Durieux (CP3 - UCLouvain)
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12:10
A Covariant Formalism of Effective Field Theories 25mSpeaker: Mohammad Alminawi
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11:20
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12:35
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14:35
Lunch break
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14:35
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16:15
Precision
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14:35
Decays of quarkonia and why they are important 25mSpeaker: Dr Damir BECIREVIC (IJCLab, CNRS and Université Paris-Saclay)
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15:00
Towards Optimal BSM Sensitivity in Multiboson Processes 25mSpeaker: Henning Bahl
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15:25
Novel Background for BSM searches in VBS in the scalar channel 25m
BSM in the process $VV\rightarrow H^* \rightarrow VV$ can arise in two ways: As an effective extension of a composite Higgs at low energies or by a deviation hinting at a close-by resonance at high energies. It is thus necessary to control the standard model in these regions to high precision. We present novel standard model backgrounds, alongside lattice estimates for them, which arise from a complete treatment of gauge invariance in the standard model. We will give a detailed discussion of the origin of these corrections. At low energies, we provide estimates of the effective standard model size of the Higgs, which is of order $(40 ~\mathrm{GeV})^{-1}$. At high energies, we give first results for the PDFs for the weak sector, which need to be taken into account for an adequate estimate of the cross section.
Speaker: Sofie Martins (University of Graz) -
15:50
Exotic h → Za Higgs decays into τ leptons 25mSpeaker: Camila Ramos
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14:35
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16:15
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16:45
Coffee break
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16:45
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18:25
Precision
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16:45
CP violation in loop-induced diboson production 25mSpeaker: Marion Thomas (Max Planck Institut für Physik)
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17:10
Sensitivity to top-quark couplings in diboson production at lepton colliders 25mSpeaker: Eugenia Celada
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17:35
Impact of loop corrections to trilinear scalar couplings on di-Higgs production 25mSpeaker: Johannes Alf Braathen (DESY)
- 18:00
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16:45
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08:30
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09:15
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09:30
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10:45
Model building
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09:30
A global analysis of ALP-mediated multiboson production at the LHC 25mSpeaker: Fabian Esser
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09:55
New Bosons from a Deformed Massless-Up-Quark Solution to the Strong CP Problem: Is the Axion Hiding in Plain Sight? 25m
In a recent paper, Murayama proposed a GeV-scale axion scenario in which the up-quark mass arises dynamically from the QCD chiral condensate, which also spontaneously breaks a Peccei-Quinn symmetry. If correct, the QCD axion may already be hidden among the known pseudoscalar resonances in the 1-2 GeV region, accompanied by a scalar partner predicted by the same framework. The proposal, however, faces a serious challenge: it generically predicts too large a neutral-charged pion mass splitting. I will discuss attempts to overcome this problem and show that a structural obstruction remains: the new Peccei-Quinn spurion breaks the accidental isospin symmetry of the chiral Lagrangian, generating enhanced higher-order effects and sizable distortions in pion-pion scattering. Although a successful resolution appears unlikely, a definitive assessment of the scenario would require lattice simulations of the resulting deformed QCD theory.
Speaker: Luca Di Luzio - 10:20
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09:30
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10:45
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11:15
Coffee break
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11:15
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12:30
Model building
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11:15
A Composite Theory of Higgs and Flavour 25mSpeaker: Joe Davighi (University of Cambridge (GB))
- 11:40
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12:05
Testing SFOEWPT scenarios in 2HDM at FCC-ee 25mSpeaker: Anisha . (Karlsruhe Institute of Technology)
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11:15
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12:30
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14:30
Lunch break
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14:30
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16:10
Experiment: BSM searches
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14:30
Resonant SH/HH searches 25mSpeaker: Christina Dimitriadi (KTH Royal Institute of Technology (SE))
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14:55
Triple-gauge couplings in LHC diboson production: a SMEFT view from every angle 25mSpeaker: Hesham El Faham (The University of Manchester)
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15:20
SMEFT interpretations in Diboson analyses 25mSpeaker: Antonio Manuel Mendes Jacques Da Costa (The University of Manchester (GB))
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15:45
Interference effects in Higgs pair production 25mSpeaker: Kateryna Radchenko Serdula (DESY)
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14:30
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16:10
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16:40
Coffee break
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17:00
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18:30
Public outreach talk (in Bosnian)
- 17:00
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19:30
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22:00
Workshop dinner - Inat Kuća (House of Spite): Veliki Alifakovac 1, Sarajevo 71000
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09:30
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10:45
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09:15
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10:55
New techniques and probes
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09:15
Probing Z' Models at Future Colliders 25m
Several models of grand unification predict the existence of an additional gauged $U(1)_D$ symmetry, which gives rise to a new heavy neutral gauge boson $Z'$ at the TeV scale. In general, the Standard Model particles may be charged under this new symmetry, with gauge coupling $g_D$, and the $Z'$ can exhibit a kinetic mixing $\epsilon$ with the hypercharge gauge boson as well. Future experiments, such as the High-Luminosity Large Hadron Collider (HL-LHC) and the Future Circular Collider (FCC), can constrain the values of $\epsilon$ and $g_D$ at the experimental scale. In this talk, I will describe how the bounds for HL-LHC and FCC can be derived within an effective field theory framework, while also highlighting their interplay with gauge coupling unification at the unification scale through renormalization group running.
Speaker: Barbara Anna Erdelyi (Università degli Studi di Padova and INFN Sezione di Padova) -
09:40
Complementary Probes to Rare Higgs Decays at Multi-TeV Lepton Colliders 25mSpeaker: Arman Korajac
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10:05
New avenues for |∆B| = 2 processes beyond neutron-antineutron oscillations 25mSpeaker: S Fajfer
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10:30
Expanding the Landscape of Exotic Muon Decays 25mSpeaker: Ajdin Palavric (IFIC Valencia)
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09:15
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10:55
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11:25
Coffee break
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11:25
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12:25
Closing session
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11:25
HHH searches from an experimental perspective 30mSpeaker: Greg Landsberg (Brown University (US))
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11:55
Rare lepton transitions: the multi-boson perspective 30mSpeaker: Jure Zupan (University of Cincinnati)
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11:25
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09:15
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10:55