Article
Physics, Multidisciplinary
V. M. Braun, Yao Ji, Jakob Schoenleber
Summary: Deeply virtual Compton scattering provides information on the transverse position and longitudinal momentum of quarks and gluons in the proton through the generalized parton distributions. We have calculated the two-loop, next-to-next-to-leading order (NNLO) coefficient functions of deeply virtual Compton scattering associated with the dominant Compton form factors H and epsilon at high energies, in anticipation of high-precision experimental data from the Electron-Ion Collider. The NNLO correction to the imaginary part of H is found to be rather large for simple generalized parton distribution models, up to a factor of 2 at the input scale Q(2) = 4 GeV2, due to a cancellation between quark and gluon contributions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Wei Tao, Zhen-Jun Xiao, Ruilin Zhu
Summary: In this paper, we calculate the next-to-leading order QCD corrections to B-c -> eta(c) and B-c -> J/psi tensor form factors within the nonrelativistic QCD framework. We obtain the analytical results for Bc to S-wave charmonium tensor form factors. We also study the properties and relations among tensor form factors in the hierarchy heavy quark limit, and provide numerical results in all the physical region.
Article
Physics, Multidisciplinary
Ignacio Borsa, Rodolfo Sassot, Daniel de Florian, Marco Stratmann, Werner Vogelsang
Summary: In this study, we perform a global QCD analysis of parton-to-pion fragmentation functions at NNLO accuracy and fit the data from single-inclusive electron-positron annihilation and semi-inclusive deep-inelastic scattering multiplicity. We investigate the impact of NNLO corrections on the description of the data and resulting pion fragmentation functions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Joshua Davies, Kay Schoenwald, Matthias Steinhauser
Summary: We study the light-fermion three-loop corrections to gg -> HH using forward scattering kinematics in the limit of a vanishing Higgs boson mass, which covers a large part of the physical phase space. We compute the form factors and discuss the technical challenges. The approach outlined in this letter can be used to obtain the full virtual corrections to gg -> HH at next-to-next-to-leading order.
Review
Physics, Multidisciplinary
Shan Cheng, Zhen-Jun Xiao
Summary: This review discusses the significance of resummation in the k(T) factorization theorem and summarizes recent progress in computing the next-to-leading order contributions to B meson decays using the perturbative QCD approach. It also comments on the current status of the PQCD approach and highlights key issues that need to be addressed for future phenomenological applications.
FRONTIERS OF PHYSICS
(2021)
Article
Astronomy & Astrophysics
Andreas Ekstedt, Oliver Gould, Johan Lofgren
Summary: We develop new perturbative tools to accurately study radiatively induced first-order phase transitions. By employing a consistent power counting scheme, we resolve previous issues and show that the infamous Linde problem is not as significant in these calculations as previously thought.
Article
Astronomy & Astrophysics
E. Laenen, J. Sinninghe Damste, L. Vernazza, W. Waalewijn, L. Zoppi
Summary: We extend the factorization of Abelian gauge theory amplitudes to the next-to-leading power (NLP) level in a soft scale expansion, introducing new universal jet functions and addressing endpoint divergences. This new factorization framework provides a first step towards a complete all-order description of gauge-theory amplitudes at NLP, considering virtual collinear modes and the interplay of nontrivial hard-collinear effects beyond one-loop level.
Article
Physics, Multidisciplinary
Long-Bin Chen, Wei Wang, Ruilin Zhu
Summary: This study presents NNLO calculation of quark quasiparton distribution functions and demonstrates the significant improvement in behavior of the extracted PDFs. With high precision lattice QCD simulations incorporating NNLO results, the study aims to test the QCD theory and obtain more precise results on nucleon PDFs for nucleon tomography at the planned electron-ion collider.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Hao-Yu Liu, Xiaohui Liu, Sven-Olaf Moch
Summary: Jets constructed via clustering algorithms have been proposed for precision measurements, but missing QCD corrections at higher orders for the jet functions affect the theoretical accuracy. This work presents a method to evaluate jet functions at higher orders in QCD, involving phase space sector decomposition with suitable soft subtractions. A concrete example is given for the quark-jet function using the anti-kT algorithm with E-scheme recombination at next-to-next-to-leading order.
Article
Physics, Multidisciplinary
Javier Mazzitelli, Pier Francesco Monni, Paolo Nason, Emanuele Re, Marius Wiesemann, Giulia Zanderighi
Summary: Studying the production of top-quark pairs in hadronic collisions is crucial for understanding the properties of the heaviest quark observed in nature, with Monte Carlo simulations being heavily relied upon and challenged by experimental measurements. This work presents the first matched computation of top-quark pair production at next-to-next-to-leading order in QCD with all-order radiative corrections using parton-shower simulations, marking an important step towards simulating other hadronic processes with color charges in the final state.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
A. Feijoo, V. Valcarce Cadenas, V. K. Magas
Summary: We have used extended Unitarized Chiral Perturbation Theory to study the meson-baryon interaction in the neutral S = -2 sector. Our approach incorporates not only the leading Weinberg-Tomozawa term, as in previous studies, but also the Born terms and next-to-leading order contribution. By employing the SU(3) symmetry of the chiral Lagrangian, we have taken most of the model parameters from the BCN model and fit them to experimental data in the neutral S = -1 sector. Our results demonstrate the ability of our approach to dynamically generate Xi(1620) and Xi(1690) states in reasonable agreement with the data, and provide a natural explanation for the puzzle with the decay branching ratios of Xi(1690). This highlights the reliability of chiral models with unitarization in coupled channels and the importance of considering Born and NLO contributions for precise calculations.
Article
Astronomy & Astrophysics
Loic Fernandez, Jean-Loic Kneur
Summary: The investigation of renormalization group optimized perturbation theory (RGOPT) at NNLO for thermal scalar field theory demonstrates efficient resummation and excellent convergence properties, significantly improving the renormalization scale dependence of thermodynamical quantities compared to standard perturbative expansions and other resummation methods. These results provide a useful first NNLO illustration for potential applications of this approach to more complex thermal QCD.
Article
Astronomy & Astrophysics
Rabah Abdul Khalek, Valerio Bertone, Alice Khoudli, Emanuele R. Nocera
Summary: We present a new determination method for the unpolarised charged pion and kaon fragmentation functions based on single-inclusive electron-positron annihilation and lepton-nucleon semi-inclusive deep-inelastic scattering data. The method includes next-to-next-to-leading order QCD corrections and combines a neural-network parametrisation of fragmentation functions with a Monte Carlo representation of their uncertainties. We discuss the quality of the determination and its dependence on higher order corrections.
Article
Physics, Multidisciplinary
Yong Du, Ayres Freitas, Hiren H. Patel, Michael J. Ramsey-Musolf
Summary: This study presents a complete, gauge-invariant computation of two-loop virtual corrections involving closed fermion loops to the polarized Moller scattering asymmetry. The contributions from two closed fermion loops and one closed fermion loop are numerically similar in magnitude to the one-loop bosonic corrections, resulting in an overall correction of 1.3% relative to the tree level asymmetry. The authors estimate the sizes of the remaining two-loop contributions and discuss implications for the upcoming MOLLER experiment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Michal Czakon, Alexander Mitov, Rene Poncelet
Summary: This study utilizes multijet rates to explore quantum chromodynamics (QCD), calculating NNLO QCD corrections for three-jet observables and three-to-two jet ratios. It demonstrates a significant reduction in the dependence of these observables on factorization and renormalization scales. This proof-of-principle computation represents a milestone in perturbative QCD.
PHYSICAL REVIEW LETTERS
(2021)
Review
Physics, Nuclear
A. Accardi, J. L. Albacete, M. Anselmino, N. Armesto, E. C. Aschenauer, A. Bacchetta, D. Boer, W. K. Brooks, T. Burton, N. -B. Chang, W. -T. Deng, A. Deshpande, M. Diehl, A. Dumitru, R. Dupre, R. Ent, S. Fazio, H. Gao, V. Guzey, H. Hakobyan, Y. Hao, D. Hasch, R. Holt, T. Horn, M. Huang, A. Hutton, C. Hyde, J. Jalilian-Marian, S. Klein, B. Kopeliovich, Y. Kovchegov, K. Kumar, K. Kumericki, M. A. C. Lamont, T. Lappi, J. -H. Lee, Y. Lee, E. M. Levin, F. -L. Lin, V. Litvinenko, T. W. Ludlam, C. Marquet, Z. -E. Meziani, R. McKeown, A. Metz, R. Milner, V. S. Morozov, A. H. Mueller, B. Muller, D. Mueller, P. Nadel-Turonski, H. Paukkunen, A. Prokudin, V. Ptitsyn, X. Qian, J. -W. Qiu, M. Ramsey-Musolf, T. Roser, F. Sabatie, R. Sassot, G. Schnell, P. Schweitzer, E. Sichtermann, M. Stratmann, M. Strikman, M. Sullivan, S. Taneja, T. Toll, D. Trbojevic, T. Ullrich, R. Venugopalan, S. Vigdor, W. Vogelsang, C. Weiss, B. -W. Xiao, F. Yuan, Y. -H. Zhang, L. Zheng
EUROPEAN PHYSICAL JOURNAL A
(2016)
Article
Physics, Multidisciplinary
D. Mueller
Article
Astronomy & Astrophysics
G. Duplancic, D. Mueller, K. Passek-Kumericki
Article
Astronomy & Astrophysics
P. Kroll, K. Passek-Kumericki
Article
Physics, Particles & Fields
Goran Duplancic, Saad Nabeebaccus, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski, Samuel Wallon
Summary: We calculate the exclusive photoproduction of a gamma pi(+/-) pair using the collinear factorisation framework, in a regime where the pair has a large invariant mass and the meson has a sufficiently large transverse momentum to avoid resonance with the outgoing nucleon. This process provides a new avenue for studying Generalized Parton Distributions (GPDs), particularly at small skewness xi, due to the high center-of-mass energies available at future experiments. By computing the scattering amplitude at leading twist and leading order in alpha(s), we estimate the cross-section and linear polarisation asymmetries for various kinematics at JLab 12-GeV, COMPASS, future EIC, and LHC (in ultra-peripheral collisions). Our results suggest that the magnitudes of the estimates are large enough to warrant dedicated experimental analysis, especially at JLab. We also compare the results obtained using an asymptotic distribution amplitude (DA) with those obtained using a recently proposed holographic DA.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Goran Duplancic, Saad Nabeebaccus, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski, Samuel Wallon
Summary: We extend our studies of a new class of 2 -> 3 exclusive processes by considering the exclusive photoproduction of a gamma rho pair. Our analysis covers the whole kinematical range from medium energies in fixed-target experiments to very large energies of colliders. We find that the obtained cross sections are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab.
Proceedings Paper
Physics, Multidisciplinary
Saad Nabeebaccus, Samuel Wallon, Goran Duplancic, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski
Summary: We study the exclusive photoproduction of a photon-meson pair with a large invariant mass in the framework of QCD factorisation. The focus is on the chiral-even sector of the generalised parton distributions (GPDs). The potential measurements of these distributions in various experiments, such as JLab 12-GeV, COMPASS, future EIC, and LHC, are discussed. The polarisation asymmetries with respect to the incoming photon are also computed.
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT
(2023)
Article
Astronomy & Astrophysics
P. Kroll, K. Passek-Kumeri
Summary: We investigate the wide-angle photoproduction of the eta'-meson using the handbag approach and find that, unlike pion and eta photoproduction, this process is dominated by twist 2 due to the gluon content of the eta'. By utilizing the available information on twist-2 and twist-3 distribution amplitudes and eta-eta' mixing, we are able to predict the cross section and helicity correlations for eta' photoproduction. We argue that studying eta' photoproduction is valuable in improving our understanding of the two-gluon distribution amplitude.
Article
Astronomy & Astrophysics
P. Kroll, K. Passek-Kumericki
Summary: Investigated wide-angle photo- and electroproduction of pions within the handbag mechanism, where amplitudes factorize into hard partonic subprocess amplitudes and form factors representing generalized parton distributions. Calculated the subprocess to twist-3 accuracy by considering the 2- and 3-body Fock components of the pion for gauge invariance in QED and QCD. Extensive results on charged pion photoproduction presented and compared to experiment, with predictions on electroproduction and spin effects given.
Article
Physics, Particles & Fields
I. R. Gabdrakhmanov, D. Mueller, O. Teryaev
PHYSICS OF PARTICLES AND NUCLEI LETTERS
(2019)
Proceedings Paper
Physics, Multidisciplinary
G. Duplancic, K. Passek-Kumericki, B. Pire, L. Szymanowski, S. Wallon
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT
(2019)
Article
Astronomy & Astrophysics
P. Kroll, K. Passek-Kumericki
Proceedings Paper
Physics, Applied
Kresimir Kumericki, Dieter Muller
DIFFRACTION 2016: INTERNATIONAL WORKSHOP ON DIFFRACTION IN HIGH-ENERGY PHYSICS
(2017)
Proceedings Paper
Physics, Multidisciplinary
D. Mueller, K. Semenov-Tian-Shansky
6TH INTERNATIONAL CONFERENCE ON PHYSICS OPPORTUNITIES AT AN ELECTRON-ION COLLIDER
(2016)
Article
Physics, Particles & Fields
Bogdan Damski
Summary: In this paper, we discuss the dynamics of field configurations in the Proca theory of the real massive vector field, specifically focusing on a certain class of electric (magnetic) dipole-charged states. We construct these states to ensure that the long-distance structure of the mean electromagnetic field is initially set by the formula describing the electromagnetic field of the electric (magnetic) dipole. We analyze the evolution of this mean electromagnetic field over time and observe the phenomena of harmonic oscillations of the electric (magnetic) dipole moment far from the center of the initial field configuration, as well as the emergence of a spherical shock wave propagating at the speed of light near the center. Additionally, we discover a unique axisymmetric mean electric field configuration accompanying the mean magnetic field in magnetic dipole-charged states.
Article
Physics, Particles & Fields
Brett McInnes
Summary: The time-dependence of AdS black hole interior geometries poses challenges to holographic duality and the traversability of wormholes. Quantum circuit complexity of strongly coupled matter can address the first challenge. Data from a phenomenological model show an upper bound on the complexity growth rate, which becomes stricter with the addition of angular momentum. The slowing of black hole interior dynamics at high specific angular momentum also occurs.
Article
Physics, Particles & Fields
M. Beccaria, S. Giombi, A. A. Tseytlin
Summary: This article investigates the superconformal index Z of the 6d (2,0) theory on S5 x S1 and describes it using the quantum M2 brane theory in the large N limit. By studying M2 branes in a twisted product of thermal AdS7 and S4, the leading non-perturbative term at large N is shown to be reproduced by the 1-loop partition function of an instanton M2 brane wrapped on S1 x S2 with S2 c S4. Similarly, the partition function of a defect M2 brane wrapped on thermal AdS3 c AdS7 reproduces the BPS Wilson loop expectation value in the (2,0) theory. The article also comments on the analogy of these results with similar computations in the quantum M2 brane partition function in AdS4 x S7/DOUBLE-STRUCK CAPITAL Zk, which reproduced the corresponding localization expressions in the ABJM 3d gauge theory.
Article
Physics, Particles & Fields
Carlos Silva
Summary: This paper explores the nature of spacetime in quantum gravity based on a new version of the holographic principle that establishes a connection between string theory and polymer holonomy structures. The research findings suggest that, for this relationship to hold, spacetime must be perceived as emerging from a fundamental structure with degrees of freedom corresponding to quantum correlations only.
Article
Physics, Particles & Fields
A. Senol, H. Denizli, C. Helveci
Summary: This study investigates new physics using a Monte Carlo method, and the results show stronger limitations on anomalous quartic gauge couplings compared to previous experiments.
