Article
Astronomy & Astrophysics
Daniel Elander, Ali Fatemiabhari, Maurizio Piai
Summary: We study a holographic description in this paper which explains the spontaneous breaking of an approximate SO(5) global symmetry to its SO(4) subgroup in a field theory. By analyzing the spectrum of small fluctuations of the bulk fields, we find some important results, including the heavy mass of pseudo-Nambu-Goldstone bosons(PNGBs) and the existence of a specific region in parameter space when the dimension of the field theory operator causing SO(5) breaking is close to half the space-time dimensionality. These findings are significant for model building in the context of composite Higgs.
Article
Physics, Particles & Fields
Giacomo Cacciapaglia, Martin Rosenlyst
Summary: The model presents a composite scotogenic model for neutrino masses, generated through loops of DOUBLE-STRUCK CAPITAL Z(2)-odd composite scalars and considering three different approaches to the couplings between neutrinos and the composite sector. If the masses of the three DOUBLE-STRUCK CAPITAL Z(2)-odd right-handed neutrinos are between the TeV and Planck scales, the model can have sizable couplings and remain viable with respect to various experimental constraints. Additionally, the lightest DOUBLE-STRUCK CAPITAL Z(2)-odd composite scalar may serve as Dark Matter via thermal freeze-out or as an asymmetric relic, featured in various models based on vacuum misalignment.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Domenec Espriu, Alisa Katanaeva
Summary: This study reconsiders the use of holographic techniques in describing a 4D minimal composite Higgs model with a global symmetry breaking pattern of SO(5) -> SO(4), allowing the study of spin one and spin zero resonances. By implementing experimental constraints, it is found that the model can accommodate new vector resonances, with estimates on their production couplings in Standard Model processes.
Article
Astronomy & Astrophysics
Giacomo Cacciapaglia, Shahram Vatani, Chen Zhang
Summary: Composite Higgs models can be extended to the Planck scale using the partially unified partial compositeness (PUPC) framework. The Techni-Pati-Salam model is based on a renormalizable gauge theory and predicts masses and mixings for standard model fermions through partial compositeness at low energy. This model also suggests the presence of a dark matter candidate in the few TeV range.
Article
Physics, Particles & Fields
John Ellis, Maeve Madigan, Ken Mimasu, Veronica Sanz, Tevong You
Summary: The search for effective field theory deformations of the Standard Model is conducted through a global approach in the framework of the Standard Model Effective Field Theory. The analysis includes constraints on the coefficients of SMEFT operators and explores specific ultra-violet completions of the Standard Model, but does not find significant evidence for physics beyond the Standard Model.
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
Yong-Hui Qi, Jiang-Hao Yu, Shou-Hua Zhu
Summary: The study focuses on the effective chiral Lagrangians of a next-to-minimal composite Higgs model, exploring the function dependence on the Higgs boson and new scalar s and relationships among different Higgs couplings. By matching to the Higgs effective field theory, various low-energy observables are obtained, encoding the Higgs nonlinearity effects.
Article
Astronomy & Astrophysics
Yi Chung
Summary: The paragraph discusses a composite Higgs model based on the SU(6)/Sp(6) coset, with an U(1) subgroup of Sp(6) identified as the flavor symmetry. By introducing a light flavon, it generates the mass hierarchy between the top and bottom quarks and provides a testable model for the origin of flavor hierarchy. The direct search of additional scalar bosons can be conducted in HL-LHC and future hadron colliders.
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
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
Astronomy & Astrophysics
A. Doff
Summary: The possibility that the Higgs boson is a composite dilaton is discussed in this paper, and evidence supporting this hypothesis is provided by verifying the behavior of the potential function. This is of great significance for understanding the nature of the Higgs boson and advancing the field of particle physics.
Article
Physics, Particles & Fields
Vincent Drach, Patrick Fritzsch, Antonio Rago, Fernando Romero-Lopez
Summary: This article presents the first calculation of the scattering amplitude in the singlet channel beyond QCD. The calculation is performed in SU(2) gauge theory with N-f=2 fundamental Dirac fermions and based on a finite-volume scattering formalism. The theory exhibits a SU(4)->Sp(4) chiral symmetry breaking pattern that is used to design minimal composite Higgs models currently tested at the LHC. Our results show that, for the range of underlying fermion mass considered, the lowest flavor singlet state is stable.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
A. Bharucha, G. Cacciapaglia, A. Deandrea, N. Gaur, D. Harada, F. Mahmoudi, K. Sridhar
Summary: The next generation electron-positron colliders are designed for precision studies of the Standard Model and its extensions, particularly focusing on the Higgs sector. By studying Higgs pair production through photon collisions, potential discoveries of composite Higgs models can be made. Significant deviations from the Standard Model predictions are present in a general class of composite Higgs models, primarily due to the new quartic coupling of the Higgs to tops and the presence of a light scalar resonance.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Anisha, Upalaparna Banerjee, Joydeep Chakrabortty, Christoph Englert, Michael Spannowsky
Summary: The study investigates the effects of charged scalar extensions in the Higgs sector of the Standard Model, as well as the EFT couplings of this new state to SM matter. It shows that loop-induced decays of the 125 GeV Higgs boson can clarify the additional states phenomenology. EFT interactions of the charged Higgs can lead to a decreased sensitivity to the virtual presence of charged Higgs states.
Article
Mechanics
Giacomo Bracci Testasecca, Andrea Pelissetto
Summary: We study a variant of the charge -Q compact Abelian-Higgs model, where a complex vector of N-f dimensions is coupled with an Abelian Zq gauge field. For N-f = 2 and Q =1, we find multiple transition lines belonging to O(4), O(3), and O(2) vector universality classes, depending on the symmetry breaking pattern. The universality class is independent of q for q ? 3. The behavior of scalar fields uniquely determines the universality class of the transition, while gauge fields have no influence. We also investigate the system for N-f = 15 and Q = 2. In the presence of U(1) gauge fields, the system undergoes transitions associated with charged fixed points of the Abelian-Higgs field theory. These continuous transitions turn into first-order ones when the U(1) gauge fields are replaced by the discrete Z(q) fields: charged transitions in this compact model are highly sensitive to the nature of gauge fields.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2023)
Editorial Material
Physics, Particles & Fields
Quentin Bonnefoy, Luca Di Luzio, Christophe Grojean, Ayan Paul, Alejo N. Rossia
Summary: Investigations indicate that higher-dimensional operators in effective field theories cannot source gauge anomalies by modifying interactions involved in triangle diagrams, with dimension-6 operators able to be chosen independently without affecting the consistency of the theory. This finding applies to both the Standard Model and the Standard Model Effective Field Theory, offering a new method to verify the absence of anomalies in the Standard Model.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gauthier Durieux, Matthew McCullough, Ennio Salvioni
Summary: We investigate radiatively stable classes of pseudo-Nambu-Goldstone boson potentials and find that Gegenbauer polynomial potential is radiatively stable. In Gegenbauer pNGB models, we naturally obtain a proportional relationship between v and f/n. Based on this, we argue that determination of whether the Higgs is a composite pNGB will require advancements beyond current experimental capabilities.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Physics, Multidisciplinary
Shehu S. AbdusSalam, Fruzsina J. Agocs, Benjamin C. Allanach, Peter Athron, Csaba Balazs, Emanuele Bagnaschi, Philip Bechtle, Oliver Buchmueller, Ankit Beniwal, Jihyun Bhom, Sanjay Bloor, Torsten Bringmann, Andy Buckley, Anja Butter, Jose Eliel Camargo-Molina, Marcin Chrzaszcz, Jan Conrad, Jonathan M. Cornell, Matthias Danninger, Jorge de Blas, Albert De Roeck, Klaus Desch, Matthew Dolan, Herbert Dreiner, Otto Eberhardt, John Ellis, Ben Farmer, Marco Fedele, Henning Flaecher, Andrew Fowlie, Tomas E. Gonzalo, Philip Grace, Matthias Hamer, Will Handley, Julia Harz, Sven Heinemeyer, Sebastian Hoof, Selim Hotinli, Paul Jackson, Felix Kahlhoefer, Kamila Kowalska, Michael Kraemer, Anders Kvellestad, Miriam Lucio Martinez, Farvah Mahmoudi, Diego Martinez Santos, Gregory D. Martinez, Satoshi Mishima, Keith Olive, Ayan Paul, Markus Tobias Prim, Werner Porod, Are Raklev, Janina J. Renk, Christopher Rogan, Leszek Roszkowski, Roberto Ruiz de Austri, Kazuki Sakurai, Andre Scaffidi, Pat Scott, Enrico Maria Sessolo, Tim Stefaniak, Patrick Stoecker, Wei Su, Sebastian Trojanowski, Roberto Trotta, Yue-Lin Sming Tsai, Jeriek Van den Abeele, Mauro Valli, Aaron C. Vincent, Georg Weiglein, Martin White, Peter Wienemann, Lei Wu, Yang Zhang
Summary: This article discusses the unique challenges that physical theories dependent on many parameters or tested against data from multiple experiments pose to statistical inference. The authors provide clear guidance and recommendations for statistically sound inference methods, as well as readily-available software tools and standards. Examples provided in the article can be reproduced using publicly available code on Zenodo.
REPORTS ON PROGRESS IN PHYSICS
(2022)
Article
Physics, Particles & Fields
Gauthier Durieux, Matthew McCullough, Ennio Salvioni
Summary: In Twin Higgs models, the introduction of the Gegenbauer Goldstone model can naturally eliminate the problem of fine-tuning. By combining the two, the Gegenbauer Twin model provides a symmetry-based model for Higgs-sector naturalness that is consistent with current measurements and does not require fine-tuning of parameters. Deviations in single-Higgs coupling and trilinear self-coupling are unavoidable in the natural parameter space, and the Gegenbauer Twin model could be tested through di-Higgs measurements at the High-Luminosity LHC.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Lina Alasfar, Ramona Grober, Christophe Grojean, Ayan Paul, Zhuoni Qian
Summary: This work explores the use of interpretable machine learning and cooperative game theory to extract the trilinear Higgs self-coupling in Higgs pair production. It shows how a topological decomposition of the production process can simplify the machine learning analysis flow. The analysis is extended to include suppressed processes in the Standard Model, allowing for constraints on light-quark Yukawa couplings.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Gauthier Durieux, Matthew McCullough, Ennio Salvioni
Summary: This article explores the possibility of new physics manifesting itself through Higgs self-coupling measurements. The authors derive a bound on the ratio of self-coupling to single-Higgs coupling deviations in ultraviolet completions of the Standard Model. The study suggests that self-coupling measurements at the LHC and future colliders have the potential to discover new physics even in the absence of hints in single-Higgs coupling measurements. In the models discussed, the Higgs self-coupling deviations could exceed 200% without fine-tuning ultraviolet parameters.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Quentin Bonnefoy, Christophe Grojean, Jonathan Kley
Summary: This paper investigates the breaking of shift invariance in the effective couplings of an axionlike particle to standard model fermions and identifies a minimal set of Jarlskog-like flavor invariants as order parameters for this breaking of axion shift symmetry.
PHYSICAL REVIEW LETTERS
(2023)
Correction
Physics, Particles & Fields
Gauthier Durieux, Matthew McCullough, Ennio Salvioni
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Fady Bishara, Philipp Englert, Christophe Grojean, Giuliano Panico, Alejo N. N. Rossia
Summary: Diboson production processes are important targets for precision measurements at hadron colliders. The V h production channel with h -> b (b) over bar decay has a large cross section and can be accessed at the LHC. By combining different lepton channels and a b-tagging algorithm, we improve the analysis and obtain sensitivity to dimension-6 SMEFT operators that modify the couplings of W and Z bosons to quarks. This analysis is competitive with other bounds and has implications for new physics scales.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca Silvestrini, Mauro Valli
Summary: The LHCb Collaboration has conducted a new study on B+ -> K+e+e- and B -> K*0e+e- (e = e, mu) decays, testing lepton universality with unprecedented accuracy using all available data. The CMS Collaboration has also improved the analysis of B(d;s) -> mu+mu- branching ratios. Both studies provide insights into new physics, but the global analysis of b -> se+e- transitions relies on assumptions about nonperturbative contributions. This work performs a global Bayesian analysis on (semi)leptonic rare B decays, considering the role of charming penguins that are difficult to evaluate. The data is consistent with the Standard Model, and stringent bounds on lepton universality violation are derived in I Delta BI = I Delta SI = 1 (semi)leptonic processes.
Article
Astronomy & Astrophysics
Maximilian Ruhdorfer, Ennio Salvioni, Andrea Wulzer
Summary: We propose to use forward muons produced in association with the Higgs in the Z-boson fusion channel to probe the decay of the Higgs boson to invisible particles at a muon collider. The large number of produced Higgs bosons provides the possibility of achieving excellent sensitivity, provided a forward muon detector is installed. However, the resolution on the measurement of the muon energy and angle is identified as the main limiting factor for the actual sensitivity, requiring strict requirements on the design of the forward muon detector.
Article
Physics, Particles & Fields
Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca Silvestrini, Mauro Valli
Summary: The LHCb experiment has presented new results on Lepton Universality Violation in B -> K((*))l(+)l(-) decays involving KS, which support the evidence obtained in previous decays and measurements. The predictions of Lepton Universality Violation observables in New Physics scenarios are sensitive to hadronic dynamics, particularly the charming penguin contribution. This study emphasizes the importance of a conservative treatment of hadronic uncertainties in assessing the significance of deviations from the Standard Model and understanding the nature of New Physics responsible for Lepton Universality Violation.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Ayan Paul, Mauro Valli
Summary: The new measurement of the W-boson mass from the CDF Collaboration shows a significant discrepancy with the Standard Model prediction, indicating possible physics beyond the Standard Model.
Article
Physics, Particles & Fields
Hsin-Chia Cheng, Lingfeng Li, Ennio Salvioni
Summary: The study presents a complete model of a dark QCD sector with light dark pions, motivated by hidden naturalness arguments. The dark pions behave as either composite axion-like particles or scalars depending on their CP properties, and their lifetimes fall in the interesting region for current and proposed long-lived particle searches. Constraints from B decays at CMS and Z-initiated dark showers at LHCb are discussed, focusing on the displaced dimuon signature, as well as the potential sensitivity of ATLAS and CMS to dark shower signals with large multiplicities and long lifetimes of the dark pions. A new data-driven calculation of the decays of a light ALP to exclusive hadronic Standard Model final states is performed, providing results applicable to any model with arbitrary flavor-diagonal couplings of the ALP to fermions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
