Article
Physics, Nuclear
Honglei Li, Huayang Song, Shufang Su, Wei Su, Jin Min Yang
Summary: This research focuses on analyzing the implications of Higgs precision measurements at future Higgs factories for the MSSM parameter space, with a specific focus on the dominant stop sector contributions. A multi-variable fit was conducted to examine the signal strength for various Higgs decay channels and the Higgs mass at Higgs factories. The chi(2) fit results demonstrate sensitivity to parameters such as m(A), tan beta, stop mass parameter m(SUSY), and stop left-right mixing parameter Xt, while also studying the impact of Higgs mass prediction on the MSSM and comparing sensitivities across different Higgs factories.
Article
Astronomy & Astrophysics
Shuichiro Funatsu, Hisaki Hatanaka, Yuta Orikasa, Naoki Yamatsu
Summary: In this paper, we studied the contributions to single Higgs boson production processes via Z' and W' bosons in the GHU model. We analyzed the cross sections of three processes and found that the deviation from the SM increases with respect to the center-of-mass energy and can reach up to 20% for certain energy scales. We also showed that the sign of the bulk mass of a lepton multiplet in the GHU model can be determined by examining the deviation of the left-right symmetry.
Article
Physics, Nuclear
Xing-Hua Yang, Zhong-Juan Yang
Summary: This paper studies the pair production of an introduced Higgs triplet at future e(-)p. colliders and analyzes the collider phenomenology and detection sensitivity of the doubly charged Higgs in different decay scenarios.
Article
Astronomy & Astrophysics
Arindam Das, P. S. Bhupal Dev, Yutaka Hosotani, Sanjoy Mandal
Summary: This article discusses the minimal U(1)(X) extension of the Standard Model, where the coupling of the new neutral gauge boson (Z') with the SM fermions is determined by the U(1)(X) charges of the new scalar fields. The study finds that future e(-)e(+) colliders can be used to probe multi-TeV Z' bosons through observables such as angular distributions, forward-backward (AFB), left-right (ALB), and left-right forward-backward (ALR-FB) asymmetries.
Article
Physics, Particles & Fields
Shinya Kanemura, Mitsunori Kubota, Kei Yagyu
Summary: The research shows that the testability of CP-violating phases can be experimented at future lepton colliders, and the aligned two Higgs doublet model has a certain measurability in this aspect.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Carlos Bautista, Leonardo de Lima, Ricardo D'Elia Matheus, Eduardo Ponton, Leonidas A. Fernandes do Prado, Aurore Savoy-Navarro
Summary: In this study, the production of t (t) over barh and t (t) over bar hh at hadron colliders in the minimal Composite Higgs Models based on the coset SO(5)/SO(4) is investigated, with a focus on the fermionic representations 5 and 14. The analysis shows that in certain regions of parameter space, the three-body decay channel W(+)W(-)t becomes significant in the production of top partners, especially in a degenerate spectrum, and this significance is further enhanced by increasing the top partner's mass.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
G. Cacciapaglia, A. Deandrea, A. M. Iyer, K. Sridhar
Summary: The Tera-Z phase of future e(+)e(-) colliders FCC-ee and CEPC is a valuable tool for exploring Z portal physics, specifically in studying axionlike particles (ALPs) production. By focusing on composite Higgs models with ALPs, Tera-Z has the capability to probe composite scales up to 100s of TeV, providing constraints on models explaining the muon g - 2 anomaly.
Article
Physics, Particles & Fields
Wolfgang Kilian, Sichun Sun, Qi-Shu Yan, Xiaoran Zhao, Zhijie Zhao
Summary: This study investigates the observability of new interactions affecting Higgs-pair production at the LHC and future proton-proton colliders. By tagging boosted Higgs bosons, projected bounds for the operator coefficient at different colliders are determined, taking into account unitarity constraints. The discovery potential for new physics in Higgs pair production in this channel is estimated.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
A. Garcia-Abenza, J. M. No
Summary: High-energy gamma gamma colliders have the potential to probe dark sectors and the parameter space of the Higgs portal with precision comparable to other planned collider facilities.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Peter Athron, Csaba Balazs, Andrew Fowlie, Huifang Lv, Wei Su, Lei Wu, Jin Min Yang, Yang Zhang
Summary: In this work, the impact of electroweak and Higgs precision measurements at future electron positron colliders on various supersymmetric models is studied. The results show that future precision measurements can further test the currently allowed parameter space of these models and potentially distinguish different dark matter annihilation mechanisms.
Article
Physics, Particles & Fields
F. Arco, S. Heinemeyer, M. J. Herrero
Summary: An important task at future colliders is investigating the Higgs-boson sector, especially the measurement of triple Higgs couplings. Two-dimensional benchmark planes are defined and analyzed within the framework of Two Higgs Doublet Models, evaluating di-Higgs production cross sections at future high-energy e(+) e(-) colliders.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Pankaj Agrawal, Debashis Saha, Ambresh Shivaji
Summary: The study focuses on the production of a Higgs boson in association with two electroweak vector bosons at hadron colliders, comparing contributions from the gg channel to those from the qq channel. It is found that the gg channel has the largest cross section in W+W-H production, but its relative contribution is more important in pp -> ZZH production. The dependence on kappa(V) for the gg channel contribution is stronger than that for the qq channel contribution, especially when longitudinally polarized W and Z bosons are involved.
Article
Physics, Particles & Fields
Stefano Camarda, Leandro Cieri, Giancarlo Ferrera, Jesus Urtasun-Elizari
Summary: We introduce a new numerical program, HTurbo, which accurately predicts the production cross sections of Higgs bosons in a fast and precise manner. The program implements the perturbative QCD expansion and resummation of large logarithmic corrections, and includes the production and decay of Higgs bosons through gluon fusion and two-photon processes with complete dependence on the final-state kinematics. We benchmark our predictions against other numerical programs, HRes and HNNLO, and show that HTurbo is an improved reimplementation.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Review
Physics, Multidisciplinary
Johan Bonilla, Grigorios Chachamis, Barry M. Dillon, Sergei V. Chekanov, Robin Erbacher, Loukas Gouskos, Andreas Hinzmann, Stefan Hoeche, B. Todd Huffman, Ashutosh. V. Kotwal, Deepak Kar, Roman Kogler, Clemens Lange, Matt LeBlanc, Roy Lemmon, Christine McLean, Benjamin Nachman, Mark S. Neubauer, Tilman Plehn, Salvatore Rappoccio, Debarati Roy, Jennifer Roloff, Giordon Stark, Nhan Tran, Marcel Vos, Chih-Hsiang Yeh, Shin-Shan Yu
Summary: Jet substructure has played a crucial role in motivating and designing future energy Frontier colliders, and there is a need for a vibrant research and development program to extend its physics into new regimes.
FRONTIERS IN PHYSICS
(2022)
Article
Astronomy & Astrophysics
D. Domenech, M. J. Herrero, R. A. Morales, M. Ramos
Summary: In this study, we investigate the production of two Higgs bosons at the planned electron positron colliders, CLIC and ILC, using effective field theories (EFTs). We compare the Higgs effective field theory (HEFT) with the Standard Model effective field theory (SMEFT), and analyze the predictions for double Higgs production in both EFTs. We find that in the HEFT case, the total cross section can be understood in terms of the LL contribution, which is dominated by two HEFT coefficients. By matching the two EFTs at the level of the scattering amplitude, we find the correspondence of the leading coefficients in the HEFT and the SMEFT. Furthermore, we explore the sensitivity to these coefficients at CLIC and ILC, and determine the accessible region for these parameters by studying the predicted rates for the final state bb over bar bb over bar nu nu over bar.
Article
Physics, Particles & Fields
A. Cordero-Cid, J. Hernandez-Sanchez, V. Keus, S. Moretti, D. Rojas, D. Sokolowska
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Nuclear
Abdesslam Arhrib, Adil Jueid, Stefano Moretti
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Astronomy & Astrophysics
R. Benbrik, M. Boukidi, S. Moretti, S. Semlali
Summary: This study provides a possible explanation for the excess in the di-photon spectrum reported by the CMS Collaboration and the long-standing anomaly in the b(b) over bar invariant mass spectrum in four-jet events collected at LEP. By introducing a specific Yukawa texture in a generic 2-Higgs Doublet Model (2HDM) of Type-III, the authors show that Lepton Flavour Violating (LFV) (neutral) currents can be induced at tree level. The solutions found in this scenario are consistent with current theoretical and experimental bounds.
Article
Physics, Particles & Fields
Alexander Belyaev, Ulla Blumenschein, Arran Freegard, Stefano Moretti, Dipan Sengupta
Summary: Explored the method of discovering Dark Matter using leptonic signatures at high energy colliders. Explored model parameters related to multi-lepton signatures and provided a generic and model-independent approach for similar models.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Fiaschi, F. Giuli, F. Hautmann, S. Moch, S. Moretti
Summary: We investigate the impact of theoretical systematic uncertainties arising from quark density on the LHC experimental searches for Z'-bosons. Employing a method initially proposed in the ABMP16 PDF set to study the high-x behavior of quark density, we present findings on observables commonly utilized for studying Z' signals in dilepton channels.
Article
Physics, Particles & Fields
Murad Ali, Shaaban Khalil, Stefano Moretti, Shoaib Munir, Roman Nevzorov, Alexandre Nikitenko, Harri Waltari
Summary: We perform a model-independent search for leptoquarks (LQs) at the Large Hadron Collider. Assuming full luminosity of the Run 2, we show that a fully hadronic signal from the tt intermediate state can surpass existing searches relying on leptons in the final state. Our conclusion is supported by a Monte Carlo analysis and we propose the deployment of our search channel in the experimental setting of the Run 3.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Review
Physics, Particles & Fields
Daniele S. M. Alves, Daniele Barducci, Gianluca Cavoto, Luc Darme, Luigi Delle Rose, Luca Doria, Jonathan L. Feng, Andre Frankenthal, Ashot Gasparian, Evgueni Goudzovski, Carlo Gustavino, Shaaban Khalil, Venelin Kozhuharov, Attila J. Krasznahorkay, Tommaso Marchi, Manuel Meucci, Gerald A. Miller, Stefano Moretti, Marco Nardecchia, Enrico Nardi, Hugo Natal da Luz, Giovanni Organtini, Angela Papa, Ann-Kathrin Perrevoort, Vlasios Petousis, Gabriele Piperno, Mauro Raggi, Francesco Renga, Patrick Schwendimann, Rudolf Sykora, Claudio Toni, Paolo Valente, Cecilia Voena, Cheuk-Yin Wong, Xilin Zhang
Summary: The workshop Shedding light on X17 brings together scientists to explore the existence of a hypothetical particle called X17, which can explain the resonant structure observed at around 17 MeV in the invariant mass of electron-positron pairs produced at the Atomki Laboratory. The purpose of the workshop is to discuss the implications of this anomaly, including theoretical interpretations and ongoing/future experiments to confirm or provide experimental evidence for this phenomenon.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
A. Chakraborty, S. Dasmahapatra, H. A. Day-Hall, B. Ford, S. Jain, S. Moretti
Summary: We compare different jet-clustering algorithms to establish fully hadronic final states resulting from the decay of a heavy Higgs state into a pair of 125 GeV Higgs bosons that decay into bottom-antibottom quark pairs. These events typically have boosted topologies, where the b<($)over bar b> pairs from each Higgs boson tend to merge into a fat b-jet. Using large hadron collider (LHC) settings, we show how the efficiency of selecting the multi-jet final state and reconstructing the masses of all Higgs bosons depends on the choice of jet-clustering algorithm and its parameters. We identify the optimal clustering method for establishing such a ubiquitous beyond the SM (BSM) signal, illustrated with a Type-II 2-Higgs Doublet Model (2HDM).
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
A. Hammad, S. Khalil, S. Moretti
Summary: We study mono-Higgs signatures in a new physics scenario involving Standard Model Higgs boson decays using hybrid deep neural networks. We utilize a multilayer perceptron to analyze kinematic observables and optimize signal-to-background discrimination. The global color flow structure of hard jets from decays of particles with different color charges is crucial for identifying the mono-Higgs signature. By embedding the color flow structures of signals and backgrounds into constructed images, we use a convolution neural network for analysis. Hybrid deep neural networks provide higher capacity in feature extraction and signal versus background classification compared to single input deep neural networks.
Article
Astronomy & Astrophysics
Dris Boubaa, Shaaban Khalil, Stefano Moretti, Cem Salih Un
Summary: We investigate the anomalies of R(D) and R(D*) in the context of the B - L extension of the minimal supersymmetric Standard Model with inverse seesaw. We demonstrate that the lepton penguin W +/- l nu over bar l (l = e, mu,tau) mediated by CP-even/odd right-handed sneutrinos, charginos, and neutralinos can account for these anomalies simultaneously.
Article
Astronomy & Astrophysics
A. G. Akeroyd, Stefano Moretti, Tetsuo Shindou, Muyuan Song
Summary: This study investigated CP asymmetries in inclusive decays within a three-Higgs-doublet model, finding that these asymmetries may exceed current experimental limits, with particular interest in one CP asymmetry predicted to be zero in the Standard Model. A measurement of 2.5% or higher for this specific observable with full BELLE II data would provide strong evidence for physics beyond the SM.
Article
Astronomy & Astrophysics
Souad Semlali, Henry Day-Hall, Stefano Moretti, Rachid Benbrik
Article
Astronomy & Astrophysics
A. G. Akeroyd, Stefano Moretti, Muyuan Song
Article
Astronomy & Astrophysics
Luigi Delle Rose, Shaaban Khalil, Simon J. D. King, Stefano Moretti, Ahmed M. Thabt
Article
Astronomy & Astrophysics
A. Belyaev, S. Moretti, T. R. Fernandez Perez Tomei, S. F. Novaes, P. G. Mercadante, C. S. Moon, L. Panizzi, F. Rojas, M. Thomas