Article
Physics, Particles & Fields
Valentin V. Khoze, Sebastian Schenk
Summary: At sufficiently high energies, the production of a large number of particles is allowed. However, in certain cases, the perturbative approach fails and an effective field theory is needed to describe the phenomena. By studying the effects of higher-dimensional operators in the effective field theory, we find that they contribute to an exponential growth factor.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Sebastian Schenk
Summary: Using resummed perturbative expansions in scalar quantum field theories with a unique global minimum may still lead to severe shortcomings in the high-energy regime, as demonstrated in the computation of multiparticle threshold amplitudes.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Aditya Pathak, Iain W. Stewart, Varun Vaidya, Lorenzo Zoppi
Summary: In this study, a factorization framework was developed to compute the double differential cross section in soft drop groomed jet mass and groomed jet radius, with a description of effective theories in different groomed jet radius regions. The NLL ' results for perturbative moments relating to hadronization corrections were presented, and compared with Monte Carlo simulations and a calculation using the coherent branching method.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Christian W. Bauer, Aneesh V. Manohar, Pier Francesco Monni
Summary: The study explores the resummation of radiative corrections to collider jet observables using soft collinear effective theory, showing that the observable dependence of anomalous dimensions in SCETI problems can be disentangled by introducing a suitable UV regulator in real radiation integrals. Resummation with the additional regulator can be performed by solving a two-dimensional system of RGEs in the collinear and soft sectors, resembling many features of resummation in SCETII theories through the rapidity renormalization group.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Abhijit Gadde, Trakshu Sharma
Summary: In this paper, constraints imposed by unitarity and crossing symmetry on conformal theories in large dimensions are analyzed. The results show that under certain conditions, the four-point function of identical scalar operators in a unitary conformal theory resembles that of the generalized free field theory. Additional assumptions about the spectrum of light operators can further extend the applicability of these results.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Barak Gabai, Xi Yin
Summary: We explore the analytic structure of the non-perturbative S-matrix in the Ising field theory (IFT), a simple family of massive non-integrable quantum field theories. Using collider physics and S-matrix bootstrap methods, we study the scattering phase of the lightest particles in the elastic regime and determine the analytic continuation of the 2 -> 2 S-matrix element. Numerical calculations are used to determine 3-particle amplitudes and exclude the possibility of unknown wide resonances.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yifei He, Martin Kruczenski
Summary: The S-matrix bootstrap explores the space of S-matrices allowed by various constraints, finding interesting theories at the boundary and vertices of the space. Focusing on 3+1 dimensional theories, the dual convex minimization problem provides strict upper bounds and practical advantages over the primal problem. The variables in this approach are dual partial waves that are not bound by crossing, unitarity or other constraints, yet are directly related to the partial waves that do follow those constraints.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jeremias Aguilera Damia, Riccardo Argurio, Luigi Tizzano
Summary: We propose a class of 3D quantum field theories where ordinary global symmetries mix with higher-form symmetries to form a continuous 2-group. These models can be obtained by gauging a parent theory and activating suitable compact scalar background fields, which reveal a 't Hooft anomaly in the space of coupling constants. Moreover, the gauging procedure implies that our main example has infinitely many non-invertible global symmetries, which can be obtained by dressing the continuous symmetry operators with topological quantum field theories. Finally, we discuss the holographic realization of these 2-group global symmetries and non-invertible symmetries by introducing a corresponding four-dimensional bulk description with dynamical gauge fields.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Alessio Squarcini, Antonio Tinti
Summary: In this study, we investigate near-critical two-dimensional statistical systems with phase coexistence on the half plane, leading to the formation of a droplet separating the coexisting phases under specific boundary conditions. By utilizing the low-energy properties of two-dimensional field theories, exact analytical results for the one- and two-point correlation functions of both the energy density and order parameter fields are derived. Furthermore, the subleading finite-size corrections are computed and explained in the context of a precise probabilistic framework characterizing interfacial fluctuations as a probability density of a Brownian excursion. The analysis of order parameter correlations reveals the long-ranged nature of interfacial correlations and their confinement within the interfacial region. Moreover, the analysis is extended to momentum space using the concept of interface structure factor, which is also generalized to systems bounded by a flat wall, considering the presence of the wall and its associated entropic repulsion.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Junegone Chay, Chul Kim
Summary: This study focuses on the issue of rapidity divergence in soft-collinear effective theory, analyzing the structure of collinear and soft modes in different phase spaces. By constructing rapidity regulators consistently and exploring aspects like matching, zero-bin subtraction, and collinear directional dependence, the study aims to address rapidity divergence effectively and comprehensively.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Claude Duhr, Bernhard Mistlberger, Gherardo Vita
Summary: In this article, we calculate soft phase-space and loop master integrals for the computation of color-singlet cross sections in perturbative QCD. Our results include the first nine terms in the expansion in the dimensional regulator epsilon and have applications in deeply-inelastic scattering and e(+)e(-) annihilation processes. We also compute the perturbative coefficient functions for the Drell-Yan and gluon-fusion Higgs boson production cross sections to higher orders in epsilon.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Barak Gabai, Amit Sever, De-liang Zhong
Summary: This paper studies Chern-Simons theories at large N with bosonic or fermionic matter in the fundamental representation. It classifies the conformal line operators along smooth paths and determines the spectrum of conformal dimensions and transverse spins of their boundary operators. The paper demonstrates that these line operators satisfy first-order chiral evolution equations and argues that this equation, along with the spectrum of boundary operators, uniquely determines the expectation values of these operators. The paper further shows that the line operators in the theories of bosons and fermions satisfy the same evolution equation and have the same spectrum of boundary operators.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Yuuki Hayashi, Go Mishima, Yukinari Sumino, Hiromasa Takaura
Summary: Efficiently subtracting renormalons from perturbative calculations is increasingly important for achieving high precision QCD calculations. We propose a new framework, called the Dual Space Approach, for renormalon separation, which allows for simultaneous subtraction of multiple renormalons. By using a dual transform that suppresses infrared renormalons, we derive a one-parameter integral representation for a general observable. By applying the expansion-by-regions (EBR) method to this integral representation, we systematically investigate how renormalons emerge and cancel in the entire operator product expansion (OPE) of an observable. We also demonstrate the usefulness of the dual space approach through a simulation study emulating the QCD case, and discuss its potential application to QCD calculations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Markus A. Ebert, Bernhard Mistlberger, Gherardo Vita
Summary: We present an analytic formula for the Energy-Energy Correlation (EEC) in electron-positron annihilation computed in perturbative QCD to next-to-next-to-next-to-leading order ((NLO)-L-3) in the back-to-back limit. Our computation is based on a factorization theorem of the EEC formulated within Soft-Collinear Effective Theory (SCET). By incorporating a recently calculated jet function at (NLO)-L-3, we successfully predict the EEC in the back-to-back limit. Our analysis agrees with previous results in N = 4 supersymmetric Yang-Mills theory, and we also obtain the first resummation of the EEC in the back-to-back limit at (NLL)-L-3' accuracy.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Patricio Gaete, Piero Nicolini, Euro Spallucci
Summary: This paper presents a method to address the limitations of charged black holes in (2 + 1)-dimensional anti-de Sitter space-time, by extending the parameter space of the BTZ geometry and properly identifying integration constants. The result is a well-defined internal energy, consistent with the Area Law, corresponding to a van der Waals gas.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Francesco Benini, Cristoforo Iossa, Marco Serone
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Particles & Fields
Giacomo Sberveglieri, Marco Serone, Gabriele Spada
Summary: In the classically unbroken phase, 3d O(N) symmetric phi (4) vector models exhibit a strong-weak duality in terms of their critical couplings, which is dependent on the renormalization scheme (parametrized by κ) and N. The two fixed points merge for κ = κ, and move into the complex plane as complex conjugate pairs for κ <, making the phase transition invisible from the classically unbroken phase. Furthermore, in 2d for the N = 1 phi (4) theory, the roles of classically broken and unbroken phases are reversed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Marco Gorghetto, Edward Hardy, Giovanni Villadoro
Summary: Clear evidence of scaling violations in the contribution to QCD axion dark matter abundance from string defects is found, suggesting a large number of axions from strings. Nonlinearities around the QCD scale are shown to play a crucial role in determining the final abundance, resulting in a substantially stronger lower bound on the QCD axion mass in the post-inflationary scenario compared to the naive estimate from misalignment.
Article
Physics, Particles & Fields
Lorenzo Di Pietro, Marcos Marino, Giacomo Sberveglieri, Marco Serone
Summary: This study explores the interplay between resurgent properties and the 1/N expansion in integrable field theories with renormalons. The terms in the 1/N expansion can be fully decoded in terms of a resurgent trans-series in some examples, while in others non-perturbative corrections cannot be predicted by a resurgent analysis. The properties of the series in 1/N are also investigated, showing analytical continuation beyond convergence and its connection with dualities in sine-Gordon theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Giovanni Galati, Marco Serone
Summary: This article investigates the issue of infrared divergences in three dimensional abelian gauge theories in a Coulomb phase. By utilizing generalizations of Ward-Takahashi identities, it is shown that correlation functions of gauge-invariant operators are infrared finite in all orders of perturbation theory. It is also demonstrated that certain gauge-variant correlators, including the two-point function of matter fields, are also infrared finite in perturbation theory. Possible applications of these findings are briefly discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Condensed Matter
Gabriele Spada, Stefano Giorgini, Sebastiano Pilati
Summary: This article provides a detailed description of the path-integral Monte Carlo worm algorithm for exact calculations of the thermodynamics of Bose systems in the canonical ensemble. The algorithm is applicable to homogeneous phases of bulk systems with periodic boundary conditions and allows for sampling of the probability distribution function without limitations on the length of the Monte Carlo moves. By adopting a specific representation of the path coordinates, the algorithm ensures detailed balance for any update of the path configurations without selecting the periodic image of the particles involved.
Article
Physics, Multidisciplinary
Riccardo Ciccone, Lorenzo Di Pietro, Marco Serone
Summary: There is evidence that the ground state of the 2D chiral Gross-Neveu model is a chiral spiral phase with a spatially periodic chiral condensate. This phase persists at finite N and T = 0 for any positive fermion number chemical potential mu. The appearance of this inhomogeneous phase is surprisingly simple in the framework of nonabelian bosonization. The phase diagram of the large N chiral Gross-Neveu model is also verified to be consistent with previous results through diagrammatic computation.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Fabiana De Cesare, Lorenzo Di Pietro, Marco Serone
Summary: This paper computes the S-d partition function of the fixed point of non-abelian gauge theories in continuous d, using the e-expansion around d = 4. The technical aspects of the calculation, including gauge-fixing procedure and handling of ghost zero-modes, are detailed. The result up to NLO, including two-loop vacuum diagrams, is obtained. The study examines the UV fixed point of 5d SU(2) Yang-Mills via a susy-breaking deformation of the E-1 SCFT and the behavior of QCD(3) with gauge group SU(n(c)) and n(f) fundamental matter fields.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Multidisciplinary
G. Spada, S. Pilati, S. Giorgini
Summary: The thermodynamic behavior of attractive binary Bose mixtures is studied using exact path-integral Monte Carlo methods. The focus is on the regime of interspecies interactions where the ground state is in a self-bound liquid phase. Isothermal curves in the pressure vs density plane are calculated, and the extent of the coexistence region between liquid and vapor is established. Bose-Einstein condensation occurs discontinuously within the coexistence region, as the density jumps from the normal gas to the superfluid liquid phase.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Alessio Notari, Fabrizio Rompineve, Giovanni Villadoro
Summary: We derive a reliable cosmological bound on the axion mass ma by directly deriving the production rate from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory and resulting in & SIM;30% differences from previous estimates. We also enhance the relic abundance by & SIM;40% by including momentum dependence in the Boltzmann equations for axion-pion scatterings. Using current cosmological datasets, we obtain ma < 0.24 eV, at 95% C.L., and constrain the sum of neutrino masses, P m & nu; < 0.14 eV at 95% C.L., in the presence of relic axions and neutrinos.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
G. Pascual, G. Spada, S. Pilati, S. Giorgini, J. Boronat
Summary: We study repulsive two-component Bose mixtures with equal populations and confined in a finite-size box through path-integral Monte Carlo simulations. Different behaviors are observed at different temperatures for different values of the s-wave scattering length of the interspecies potential.
PHYSICAL REVIEW RESEARCH
(2023)
Correction
Optics
G. Spada, S. Pilati, S. Giorgini
Article
Astronomy & Astrophysics
Alessandro Laio, Uriel Luviano Valenzuela, Marco Serone
Summary: We introduce an approach to find approximate numerical solutions of truncated bootstrap equations for conformal field theories in arbitrary dimensions. This method uses a stochastic search guided by an action S, which is the logarithm of the truncated bootstrap equations for a single scalar field correlator. The method looks for approximate solutions that correspond to local minima of S, even if they are far from the extremality region.
Article
Optics
G. Spada, S. Pilati, S. Giorgini
Summary: This article presents precise path-integral Monte Carlo results for the thermodynamics of a homogeneous dilute Bose gas. It investigates the pressure, energy, compressibility, and contact parameter, as well as the role of interaction effects compared to ideal gas behavior.
