Article
Astronomy & Astrophysics
Simone Amoroso, Mauro Chiesa, Clara Lavinia Del Pio, Katerina Lipka, Fulvio Piccinini, Federico Vazzoler, Alessandro Vicini
Summary: Measurements of neutral current Drell-Yan production at large invariant dilepton masses are used to test the energy scale dependence of the electroweak mixing angle. A novel implementation of the full next-to-leading order electroweak radiative corrections to the Drell-Yan process is used, exploring the potential of future analyses using proton-proton collisions at & RADIC;s = 13.6 TeV. The Standard Model predictions for the MS running at TeV scales can be probed.
Article
Astronomy & Astrophysics
Avik Banerjee, Sayan Dasgupta, Tirtha Sankar Ray
Summary: Researchers suggest that the Higgs boson may be a composite scalar with a finite extension in space, showing its characteristics in the kinematic distributions at the LHC. By constructing momentum-dependent form factors to capture the interactions of the composite Higgs with the weak gauge bosons, they demonstrate the impact in the differential distributions of various kinematic parameters for the pp -> Z*H -> l+l-bb channel, providing an important handle to probe the Higgs' substructure at the HL-LHC.
Article
Astronomy & Astrophysics
Alexander Belyaev, Stefan Prestel, Felipe Rojas-Abatte, Jose Zurita
Summary: This study reinterprets the latest ATLAS disappearing track search for a range of dark matter multiplets with different spins and electroweak quantum numbers, finding that the disappearing track signature can probe a vast portion of the parameter space. The results provide upper limits on the cross section and efficiencies in the lifetime-dark matter mass plane for all considered models, demonstrating the potential for easy recasting for similar classes of models. The recasting code employed in the study is also provided as part of the public LLP recasting repository.
Article
Astronomy & Astrophysics
Partha Konar, Biswarup Mukhopadhyaya, Rafiqul Rahaman, Ritesh K. Singh
Summary: This study investigates the modification factor alpha(b) in the b(b) over bar -associated production of the 125-GeV scalar at the high-luminosity LHC, utilizing a gradient boosting algorithm to improve statistical significance. The research shows the possibility of probing down to alpha(b) = 3 with more than 5 sigma significance at L = 3000 fb(-1) and root s= 13 TeV, with a reported achievable limit at 95% C.L. of +/- 1.95, and also discusses the scale dependence of this limit.
Article
Physics, Particles & Fields
Jeremy Andrea, Daniel Bloch, Eric Conte, Douja Darej, Robin Ducrocq, Emery Nibigira
Summary: In the paper, the relevance of using top quarks produced from new long-lived particles and detected in the tracker volume of the ATLAS and CMS experiments is investigated in the context of prospective studies for searches of new physics at the LHC Run 3. The authors study a signature called displaced top quarks, which lead to final states containing displaced vertices and a high multiplicity of displaced jets and tracks. Three simplified models based on supersymmetry are designed for the study and promising benchmarks are defined and experimental guidelines are suggested.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Andres Florez, Tomas Atehortua Garces, Jose D. Ruiz-Alvarez
Summary: The R-D(*) anomaly is a fascinating experimental result in particle physics that challenges the Standard Model. Several extensions of the SM, including heavy W0 bosons, leptoquarks with preferential couplings, and effective field theories, are studied to explain this tension. Feasibility studies are conducted at the LHC to explore each scenario, considering specific final states and optimized selection criteria. Different LHC running conditions and luminosities are taken into account.
Article
Astronomy & Astrophysics
Ke-Pan Xie, Bin Yan
Summary: The coupling relative sign between hWW and hZZ can be fully determined through experiments at the LHC involving single top quark and Higgs associated production, as well as Zh production.
Article
Astronomy & Astrophysics
Sunghoon Jung, Zhen Liu, Lian-Tao Wang, Ke-Pan Xie
Summary: We study the tagging of Higgs exotic decay signals using different types of deep neural networks, finding that the particle flow network (PFN) achieves the best performance. We verify that the PFN can serve as an efficient tagger even when trained on a different event topology and b multiplicity.
Article
Astronomy & Astrophysics
Monoranjan Guchait, Arnab Roy, Seema Sharma
Summary: This study explores the possibility of the lightest neutralino as a dark matter candidate, finding that a mild-tempered mixed neutralino may be suitable as dark matter and re-examining the parameter space that satisfies all constraints. Additionally, through experiments at the LHC, investigations into the neutralino scenario were conducted, revealing that the channel is also highly sensitive to blind spot scenarios.
Article
Astronomy & Astrophysics
Mayumi Aoki, Shinya Kanemura, Michihisa Takeuchi, Lalu Zamakhsyari
Summary: In this study, the chirality structure in lepton-flavor-violating Higgs decays h -> τμ at the LHC was investigated using a phenomenological approach. The effects of τ polarization and the importance of determining the relative visible momentum ratio x were estimated, and an appropriate analysis was conducted assuming one missing particle with a collinear mass mcol1. The results showed that the sensitivity could be affected by +/- 4-6% in terms of the upper bound for BR(h -> τμ), and the bounds on the (IyμτI; IyτμI) plane were altered accordingly. Benchmark scenarios were also studied, and the sensitivity of the chirality structure was demonstrated using the relative visible momentum ratio. It was found that the two fully polarized cases, τR and τL, which are consistent with the recently reported excess, can be distinguished at a 2σ level for 1000 fb-1. Furthermore, it was shown that an improved study with 139 fb-1 could potentially provide similar sensitivity.
Article
Astronomy & Astrophysics
Murat Abdughani, Daohan Wang, Lei Wu, Jin Min Yang, Jun Zhao
Summary: The study uses a message passing neural network to investigate the nonresonant Higgs pair production process at the LHC, finding it challenging to observe such a process. By imposing an upper limit on the production cross section of the Higgs pair, the study limits the triple Higgs boson coupling to a specific range.
Article
Physics, Particles & Fields
Amit Adhikary, Nabarun Chakrabarty, Indrani Chakraborty, Jayita Lahiri
Summary: The study focuses on probing the strength of H(+/-)W(-/+)Z interaction in new physics models at a 27 TeV proton-proton collider, finding that the H-+/- jj production process has a greater reach compared to ZH(+/-), and the discovery potential of a charged Higgs improves markedly with respect to lower centre-of-mass energies. The results are also discussed in the context of the popular Georgi-Machacek model.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Multidisciplinary Sciences
Hector de la Torre, Trisha Farooque
Summary: This article reviews recent searches for new physics performed by the ATLAS and CMS experiments at the LHC, in final states containing top and bottom quarks. Searches for vector-like quarks, leptoquarks, and heavy scalar and gauge bosons are discussed.
Article
Astronomy & Astrophysics
Shinya Kanemura, Michihisa Takeuchi, Kei Yagyu
Summary: The paper discusses the "double-aligned THDMs", focusing on the coupling between the discovered Higgs boson and Standard Model particles. It investigates the constraints and prospects of this model using measurements from flavor experiments and data from LHC. It finds that most of the parameter space has been excluded by current LHC data, but there is still potential for research in the high-luminosity LHC.
Article
Astronomy & Astrophysics
Anupam Ghosh, Partha Konar, Satyajit Seth
Summary: The study of the inert Higgs-doublet model shows that next-to-leading order QCD corrections have a significant impact on various kinematic distributions and reduce scale uncertainties, providing a refined analysis strategy for exploring dark matter candidates.
Article
Physics, Multidisciplinary
Brando Bellazzini, Alberto Mariotti, Diego Redigolo, Filippo Sala, Javi Serra
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Particles & Fields
Brando Bellazzini, Francesco Riva, Javi Serra, Francesco Sgarlata
JOURNAL OF HIGH ENERGY PHYSICS
(2017)
Article
Physics, Multidisciplinary
Brando Bellazzini, Francesco Riva, Javi Serra, Francesco Sgarlata
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Particles & Fields
Michele Frigerio, Marco Nardecchia, Javi Serra, Luca Vecchi
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Javi Serra, Stefan Stelzl, Riccardo Torre, Andreas Weiler
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Brando Bellazzini, Francesco Riva, Javi Serra, Francesco Sgarlata
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Multidisciplinary
Brando Bellazzini, Matthew Lewandowski, Javi Serra
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Particles & Fields
Maximilian Ruhdorfer, Javi Serra, Andreas Weiler
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Reuven Balkin, Javi Serra, Konstantin Springmann, Andreas Weiler
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Giovanni Banelli, Ennio Salvioni, Javi Serra, Tobias Theil, Andreas Weiler
Summary: This study demonstrates the potential of future proton-proton and electron-positron colliders to directly and indirectly test non-standard interactions involving top quarks. It also shows the impact on the parameter space of composite Higgs models and provides a consistent description of mild LHC excesses in multilepton plus jets final states within the framework of effective field theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Pietro Baratella, Dominik Haslehner, Maximilian Ruhdorfer, Javi Serra, Andreas Weiler
Summary: In this study, we investigate the renormalization group of generic effective field theories with gravity, using the on-shell amplitude approach. We introduce a modified helicity to simplify the extraction of anomalous dimensions and apply it to explain old and discover new non-renormalization theorems for theories involving gravitons. Furthermore, we provide complete results for the one-loop gravitational renormalization of a generic minimally coupled gauge theory and the renormalization of dimension-six operators with at least one graviton, up to four external particles.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Reuven Balkin, Javi Serra, Konstantin Springmann, Stefan Stelzl, Andreas Weiler
Summary: This study investigates the effects of finite density on the stability of metastable vacua in relaxion models. By analyzing nucleation seeds from stars and rotating neutron stars, we derive the conditions for the formation and runaway of relaxion bubbles with lower energy minima than in vacuum. The resulting late-time phase transition in the universe provides new constraints on the parameter space of relaxion models.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Francesco Serra, Javi Serra, Enrico Trincherini, Leonardo G. Trombetta
Summary: Causality constraints on scalar-tensor theories involving black holes suggest that within the effective field theory regime, the unobservability of time advancement necessitates a cutoff length approximately the size of the inverse Schwarzschild radius of the black holes. For astrophysical black holes detectable by current gravitational wave detectors, this implies a cutoff length on the order of kilometers. Additionally, implications for gravitational wave science are discussed by exploring potential higher-dimensional operators associated with the scale of UV completion.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Reuven Balkin, Javi Serra, Konstantin Springmann, Stefan Stelzl, Andreas Weiler
Summary: In this study, we investigate the influence of matter density effects on theories with a false ground state. Large and dense systems, such as stars, can disrupt a metastable minimum and facilitate the formation of bubbles of the true minimum. We derive the conditions for the formation of these bubbles and their confinement or escape to infinity. The latter case leads to a phase transition in the universe during star formation. We explore the phenomenological consequences of such seeded phase transitions.
Article
Astronomy & Astrophysics
Javi Serra, Riccardo Torre
