Article
Physics, Particles & Fields
Silvia Ferrario Ravasio, Giovanni Limatola, Paolo Nason
Summary: In this study, the presence of infrared and linear renormalons in Quantum Chromodynamics was investigated in relation to their impact on short distance observables. Using an Abelian model, linear renormalons were found to affect the transverse momentum distribution of a neutral vector boson Z in hadronic collisions under certain conditions, while no evidence of their presence was observed in the large transverse-momentum region regardless of rapidity cuts.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Alessandro Georgoudis, Vasco Goncalves, Erik Panzer, Raul Pereira, Alexander Smirnov, Vladimir A. Smirnov
Summary: Researchers calculated epsilon-expansions around 4 dimensions of a complete set of master integrals for momentum space five-loop massless propagator integrals in dimensional regularization. Their results are consistent with conjectures predicting pi-dependent contributions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ze Long Liu, Bianka Mecaj, Matthias Neubert, Xing Wang
Summary: The study derived the first renormalized factorization theorem for a process described at subleading power in scale ratios, showed the cancellation of the dependence on the rapidity regulator to all orders in perturbation theory, successfully predicted the large logarithms in the three-loop decay amplitude, and disagreed with previous attempts to predict subleading logarithms.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
M. Asorey, F. Falceto, L. Rachwal
Summary: Completing gauge theories with higher derivative terms in the ultraviolet can greatly alter their behavior at high energies. The presence of a large number of derivatives leads to strong interactions, while a low number maintains asymptotic freedom. Consistency issues associated with extra ghosts in higher derivative theories may not affect asymptotically free theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
N. G. Gracia, V. Mateu
Summary: In this study, results for SCET and bHQET matching coefficients and jet functions are presented in the large-beta(0) limit. The computations accurately predict terms of a specific form and are in full agreement with the coefficients obtained in the full theory up to a certain order of approximation. Closed expressions for anomalous dimensions and matrix elements are obtained, which can be expanded to higher powers of alpha(s) using recursive algorithms. The perturbative convergence of a series and the size of non-perturbative corrections are quantified by examining the poles on the Borel-transform variable u.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tom Steudtner
Summary: This article investigates the renormalisation group equations for arbitrary four-dimensional quantum field theories with scalars and fermions, up to three-loop order in perturbation theory. General expressions for field anomalous dimensions, Yukawa interactions, and fermion masses are obtained, and applied to compute the renormalisation group evolution of a specific model.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Florian Herren, Anders Eller Thomsen
Summary: It has been found that there is ambiguity in choosing field-strength renormalization factors in the (MS) over bar scheme at higher orders in perturbation theory, leading to divergent renormalization group functions when trivially choosing Hermitian factors. However, these divergences can be eliminated through the Ward identity associated with flavor symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bo Feng, Hongbin Wang
Summary: In this paper, the unitarity cut method is generalized to situations where the powers of propagators in the denominator are larger than one. The problem is simplified by using the differentiation over masses trick to reduce all powers to one, allowing for the calculation of reduction coefficients for scalar bubble, scalar triangle, scalar box, and scalar pentagon with general power of propagators.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bo Feng, Tingfei Li, Xiaodi Li
Summary: By applying differential operators on an auxiliary vector, we established differential equations for tadpole coefficients and transformed them into recurrence relations for undetermined tensor coefficients. Solving these recurrence relations iteratively allows us to obtain analytic expressions of tadpole coefficients for arbitrary one-loop integrals.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Md Sabir Ali, Sourav Bhattacharya, Kinjalk Lochan
Summary: This study focuses on deriving the response function for a comoving Unruh-DeWitt particle detector coupled to a complex scalar field φ in a (3+1) dimensional cosmological de Sitter spacetime, with field-detector coupling proportional to φ(dagger)φ. Divergences are observed in the response function integral for the massless minimal complex scalar, necessitating the use of a suitable regularization scheme. The study also touches upon the possibility of extending these results to the de Sitter alpha-vacua, with some ambiguities noted in the detector response for a complex scalar field in certain vacuum states.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
D. S. Korneev, D. Plotnikov, K. Stepanyantz, N. A. Tereshina
Summary: This study focuses on the NSVZ relations for N = 1 supersymmetric gauge theories with multiple gauge couplings, demonstrating applications of NSVZ-like equations to the Adler D-function and exploring how NSVZ equations change under finite renormalizations. It also discusses the derivation of NSVZ equations for theories with multiple gauge couplings under higher derivative regularization.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jason Aebischer, Christoph Bobeth, Andrzej J. Buras, Jacky Kumar, Mikolaj Misiak
Summary: This study revisits the complete set of four-quark operators involved in non-leptonic Delta F = 1 decays governing s->d and b->d, s transitions in the Standard Model and beyond, at the Next-to-Leading Order in QCD. Discussions on different numbers of active flavours, intermediate threshold corrections, and transformations between operator bases beyond leading order were conducted. Furthermore, relevant WET Wilson coefficients were calculated, providing insight into matching with high-energy completions or the SMEFT.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Multidisciplinary Sciences
Alessio Maiezza, Juan Carlos Vasquez
Summary: In this paper, we describe the Adler function in Quantum Chromodynamics using a transseries representation within a resurgent framework. We apply this to the study of the anomalous magnetic moment of the muon. The results show that the new representation can be consistent with experimental and lattice determinations.
Article
Physics, Particles & Fields
G. Kaplanek, C. P. Burgess, R. Holman
Summary: The study investigates the interaction between Unruh-DeWitt detectors and a massless quantum field phi coupled to a hotspot, identifying a Markovian regime where thermalization occurs depending on the proximity of the qubit to the hotspot. The thermalization time is found to vary inversely with the phi-qubit coupling strength in a standard manner.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Emanuele Mereghetti, Christopher J. Monahan, Matthew D. Rizik, Andrea Shindler, Peter Stoffer
Summary: This paper defines and matches the renormalized dipole operators for quark chromoelectric dipole and quark chromo-magnetic dipole in a regularization-independent scheme. The results provide a basis for lattice QCD computations of hadronic matrix elements of these operators.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Vittorio Del Duca, Claude Duhr, Einan Gardi, Lorenzo Magnea, Chris D. White
Article
Astronomy & Astrophysics
Vittorio Del Duca, Giulio Falcioni, Lorenzo Magnea, Leonardo Vernazza
Article
Physics, Multidisciplinary
Lorenzo Magnea
PRAMANA-JOURNAL OF PHYSICS
(2009)
Article
Physics, Multidisciplinary
Asmita Mukherjee, R. Basu, H. Dahiya, L. Gamberg, R. Godbole, S. Gupta, M. C. Kumar, L. Magnea, P. Mathews, N. Mathur, A. Mukherjee, P. J. Mulders, V. Ravindran, A. Tripathi
PRAMANA-JOURNAL OF PHYSICS
(2009)
Article
Physics, Particles & Fields
Lance J. Dixon, Einan Gardi, Lorenzo Magnea
JOURNAL OF HIGH ENERGY PHYSICS
(2010)
Article
Physics, Particles & Fields
Vittorio Del Duca, Claude Duhr, Einan Gardi, Lorenzo Magnea, Chris D. White
JOURNAL OF HIGH ENERGY PHYSICS
(2011)
Article
Physics, Particles & Fields
Eric Laenen, Lorenzo Magnea, Gerben Stavenga, Chris D. White
JOURNAL OF HIGH ENERGY PHYSICS
(2011)
Article
Physics, Particles & Fields
Giulio Falcioni, Einan Gardi, Mark Harley, Lorenzo Magnea, Chris D. White
JOURNAL OF HIGH ENERGY PHYSICS
(2014)
Review
Physics, Multidisciplinary
Neelima Agarwal, Lorenzo Magnea, Chiara Signorile-Signorile, Anurag Tripathi
Summary: This review provides a pedagogical overview of the significance of infrared divergences in gauge theory, including historical results, low-order applications, extension tools, and recent developments in high-order multi-particle scattering amplitudes and collider differential distribution calculations.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Particles & Fields
Gloria Bertolotti, Lorenzo Magnea, Giovanni Pelliccioli, Alessandro Ratti, Chiara Signorile-Signorile, Paolo Torrielli, Sandro Uccirati
Summary: In this study, we have successfully constructed a completely analytic set of expressions using the Local Analytic Sector Subtraction scheme, which implements a fully local infrared subtraction for generic coloured massless final states. We have explicitly verified the cancellation of all explicit infrared poles in the double-virtual contribution, real-virtual correction, and integrated local infrared counterterms. Additionally, we have analytically evaluated all finite contributions from the integrated local counterterms using ordinary polylogarithms up to weight three. The resulting subtraction formula can be readily implemented in any numerical framework containing the relevant matrix elements up to NNLO.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Lorenzo Magnea
Summary: This study explores the infrared factorization of non-abelian multi-particle scattering amplitudes, identifying a universal color operator responsible for infrared divergences. The color-dipole contributions to the infrared operator are found to have a simple expression in certain coordinates, with scale and coupling factors separated from kinematics and color. By generalizing earlier suggestions in abelian theory, the study demonstrates that the infrared operator can be computed as a correlator of vertex operators in a conformal field theory. Verifications through OPE confirm the theory's predictions on collinear limits and tree-level factorization of soft real radiation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Lorenzo Magnea, Sam Playle, Rodolfo Russo, Stefano Sciuto
JOURNAL OF HIGH ENERGY PHYSICS
(2013)
Proceedings Paper
Physics, Particles & Fields
E. Laenen, L. Magnea, G. Stavenga, C. D. White
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
(2010)
Article
Physics, Multidisciplinary
E. Gardi, L. Magnea
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
(2009)