Article
Physics, Multidisciplinary
M. Czakon, R. Harlander, J. Klappert, M. Niggetiedt
Summary: In this Letter, the impact of the finite top-quark mass on the inclusive Higgs production cross section at higher perturbative orders was calculated at next-to-next-to-leading order QCD. The overall effect was found to be -0.26% at a pp collider energy of 13 TeV, and -0.1% at 8 TeV, eliminating one of the main theoretical uncertainties to inclusive Higgs production cross section at the LHC.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Simone Alioli, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Riccardo Nagar, Davide Napoletano, Luca Rottoli
Summary: In this paper, the NNLL' resummed 2-jettiness distribution for decays of the Standard Model Higgs boson to a bb-quark pair and to gluons is presented. The calculation relies on a factorisation formula derived using Soft-Collinear Effective Theory, where large logarithms of the 2-jettiness are resummed by renormalisation group evolution. The resummed predictions are matched to the fixed-order NNLO result using the Geneva framework, extending the validity of the results and providing a fully exclusive NNLO event generator matched to the Pythia8 parton shower.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tanmoy Mondal, Prasenjit Sanyal
Summary: We explore the prospect of searching for a fermiophobic charged Higgs via the same sign trilepton signal at the LHC, and show that this signal can serve as an effective complementary search for exploring high tan beta regions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jun Gao, Vladyslav Shtabovenko, Tong-Zhi Yang
Summary: This work completes the investigation of the energy-energy correlation (EEC) function in hadronic Higgs decays at next-to-leading order (NLO) in fixed-order perturbation theory with vanishing light quark masses. The full analytic NLO result for the previously unknown EEC in the H -> q (q) over bar + X channel is given in terms of classical polylogarithms and cross-checked against a numerical calculation. Further corrections to predictions of the Higgs EEC event shape variable, including quark mass corrections, effects of parton shower and hadronization, are discussed. The statistical error on measurements of the Higgs EEC at future Higgs factories is estimated and compared with the current perturbative uncertainty.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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
Astronomy & Astrophysics
Kari Rummukainen, Kimmo Tuominen
Summary: Understanding the dynamics of strongly coupled non-Abelian gauge theories is a major challenge in theoretical physics, with applications in understanding long-distance behavior and in areas such as dynamical electroweak symmetry breaking or composite dark sectors. This review outlines the motivations and discusses how lattice methods have been adapted to provide vacuum phase diagrams of strongly coupled gauge theories with different gauge groups and fermion representations.
Article
Astronomy & Astrophysics
Giacomo Cacciapagliaa, Francesco Sanninoc
Summary: We discuss the implications of the CDF collaboration's high-precision measurement of the W boson mass on models with a non-standard Higgs, showing that an enhancement of more than 5% in the non-standard Higgs coupling to gauge bosons is required. This can be naturally explained in dynamical models such as the dilaton Higgs, Technicolor, and glueball Higgs. The needed composite scale between 2 and 3 TeV can also account for the muon g-2 anomaly and potential violations of lepton flavour universality.
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
Multidisciplinary Sciences
Bartosz Dziewit, Magdalena Kordiaczynska, Tripurari Srivastava
Summary: A study was conducted on an extension of the Standard Model with an additional triplet of scalar bosons and a total of four Higgs bosons. The analysis focused on the associated production of a doubly charged scalar with Standard Model gauge bosons and other Higgs bosons. Promising processes involving a single produced doubly charged Higgs boson were estimated in the context of present and future hadron colliders.
Article
Physics, Particles & Fields
F. Arco, S. Heinemeyer, M. Muehlleitner, K. Radchenko
Summary: An important task of the LHC is to study the Higgs-boson sector, particularly the reconstruction of the Higgs potential. Based on previous analyses, we evaluate the di-Higgs production cross sections within the 2-Higgs-Doublet Model type I and find regions of the allowed parameter space where the cross section differs significantly from its standard model prediction, indicating possible deviations in the Higgs self-couplings. We further analyze the sensitivity to beyond-the-standard model triple Higgs couplings and demonstrate how a possible measurement of these couplings depends on experimental uncertainties, suggesting that the HL-LHC may have the potential to detect and provide a rough measurement of these sizes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Nodoka Yamanaka
Summary: This study analyzes the effects of R-parity violating supersymmetric contribution on the electric and chromoelectric dipole moments of fermions. It is found that with large tan beta, this contribution can be significantly enhanced and can be comparable in size to the known R-parity violating Barr-Zee type process. New upper limits on R-parity violating couplings are also obtained through atomic electric dipole moment and molecular beam experiments.
Article
Astronomy & Astrophysics
Jinheung Kim, Soojin Lee, Jeonghyeon Song, Prasenjit Sanyal
Summary: The null results in the new physics searches at the LHC do not exclude the existence of a light fermiophobic particle, particularly in the case of fermiophobic type-I, where the parameter space satisfies multiple theoretical requirements and maintains the stability of the scalar potential at high energy scales.
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
Yu Zhang, Mao Song, Ran Ding, Liangwen Chen
Summary: In this study, we propose searching for a heavy neutral lepton (HNL), or sterile neutrino, in electron colliders. By using the monophoton signature, we investigate the constraints on the transition magnetic moment of the HNL, which interacts with Standard Model neutrinos and photons. We find that BESIII, Belle II, and STCF have the ability to probe the parameter space of the HNL and study the dipole portal between the electron and tau-neutrino.
Article
Astronomy & Astrophysics
Sanchari Bhattacharyya, Anindya Datta
Summary: We investigate a variant of the left-right symmetric model based on the SU(3)(C) circle times SU(2)(L) circle times U(1)(L) circle times SU(2)(R) circle times U(1)(R) gauge group (32121). Spontaneous symmetry breaking leads to the existence of neutral and charged massive gauge bosons apart from the standard model bosons. The masses of these bosons and their production cross sections have been studied using the results from the Large Hadron Collider (LHC). Constraints on the masses of certain scalars and fermions have also been derived from the LHC data.
Article
Physics, Particles & Fields
Robert V. Harlander, Jonas Klappert, Stefan Liebler, Lukas Simon
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
R. V. Harlander, J. Klappert, C. Pandini, A. Papaefstathiou
EUROPEAN PHYSICAL JOURNAL C
(2018)
Article
History & Philosophy Of Science
Joshua Rosaler, Robert Harlander
STUDIES IN HISTORY AND PHILOSOPHY OF MODERN PHYSICS
(2019)
Article
Physics, Particles & Fields
Johannes Artz, Robert V. Harlander, Fabian Lange, Tobias Neumann, Mario Prausa
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Multidisciplinary
Robert Harlander, Joshua Rosaler
FOUNDATIONS OF PHYSICS
(2019)
Article
Physics, Particles & Fields
Robert Harlander, Mario Prausa, Johann Usovitsch
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
R. V. Harlander, J. Klappert, A. Voigt
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Particles & Fields
Robert Harlander, Fabian Lange, Tobias Neumann
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
M. Czakon, R. Harlander, J. Klappert, M. Niggetiedt
Summary: In this Letter, the impact of the finite top-quark mass on the inclusive Higgs production cross section at higher perturbative orders was calculated at next-to-next-to-leading order QCD. The overall effect was found to be -0.26% at a pp collider energy of 13 TeV, and -0.1% at 8 TeV, eliminating one of the main theoretical uncertainties to inclusive Higgs production cross section at the LHC.
PHYSICAL REVIEW LETTERS
(2021)
Article
History & Philosophy Of Science
Robert Harlander
Summary: The passage discusses the transition from path integrals to Feynman diagrams, highlighting the decrease and subsequent increase in complexity. It illustrates the dialectic between the simplicity and clarity of Feynman diagrams, and the complexity in their practical applications.
Article
History & Philosophy Of Science
Robert Harlander, Jean-Philippe Martinez, Gregor Schiemann
Summary: The discovery of the Higgs boson completed the confirmation of the Standard Model particle spectrum, but the expectation of future discoveries is still inconclusive. It is possible that new physics may still be within reach, but it is also possible that particles beyond the Standard Model are beyond the energy reach of any conceivable particle collider. This raises the possibility that the age of discovering new particles may belong to the past and a conceptual reconfiguration in fundamental physics is needed.
EUROPEAN PHYSICAL JOURNAL H
(2023)
Article
Astronomy & Astrophysics
R. Harlander, T. Kempkens, M. C. Schaaf
Summary: We present a complete and nonredundant basis of effective operators for the Standard Model effective field theory up to mass dimension 12 with three generations of fermions. We also include operators coupling to gravity via the Weyl tensor. The results are obtained by implementing the algorithm of Li et al. and are provided in the form of Supplemental Material.
Article
Astronomy & Astrophysics
Robert Harlander, Fabian Lange
Summary: In this study, we construct the effective electroweak Hamiltonian in the gradient-flow formalism for the current-current operators. We present the results for two common choices of the operator basis, which allows for a consistent matching of perturbatively evaluated Wilson coefficients and nonperturbative matrix elements evaluated by lattice simulations.
Review
Physics, Particles & Fields
P. Slavich, S. Heinemeyer, E. Bagnaschi, H. Bahl, M. Goodsell, H. E. Haber, T. Hahn, R. Harlander, W. Hollik, G. Lee, M. Muehlleitner, S. Passehr, H. Rzehak, D. Stoeckinger, A. Voigt, C. E. M. Wagner, G. Weiglein, B. C. Allanach, T. Biekoetter, S. Borowka, J. Braathen, M. Carena, T. N. Dao, G. Degrassi, F. Domingo, P. Drechsel, U. Ellwanger, M. Gabelmann, R. Groeber, J. Klappert, T. Kwasnitza, D. Meuser, L. Mihaila, N. Murphy, K. Nickel, W. Porod, E. A. Reyes Rojas, I Sobolev, F. Staub
Summary: Predictions for the Higgs masses are a distinctive feature of supersymmetric extensions of the Standard Model. The discovery and precise measurement of the Higgs boson at the LHC have spurred efforts to improve theoretical predictions for Higgs masses in supersymmetric models. The KUTS initiative aims to provide a platform for discussions and collaboration among different groups involved in these efforts to enhance the accuracy of predictions.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Computer Science, Interdisciplinary Applications
R. Harlander, S. Y. Klein, M. Lipp
COMPUTER PHYSICS COMMUNICATIONS
(2020)
