Article
Astronomy & Astrophysics
Matteo Bresciani, Mattia Dalla Brida, Leonardo Giusti, Michele Pepe, Federico Rapuano
Summary: This paper computes the renormalization constant of the flavour-singlet local vector current in lattice QCD with 3 massless flavours using non-perturbative methods. The constant is determined by comparing the expectation values of the conserved and local vector currents under specific conditions. The obtained results show high accuracy and are obtained through Monte Carlo simulations.
Article
Physics, Particles & Fields
Maximilian Schlemmer, Alexey Vladimirov, Christian Zimmermann, Michael Engelhardt, Andreas Schaefer
Summary: This study presents lattice results for the non-perturbative Collins-Soper (CS) kernel, which describes the energy-dependence of transverse momentum-dependent parton distributions (TMDs). The CS kernel was extracted from ratios of first Mellin moments of quasi-TMDs evaluated at different nucleon momenta using dynamical N-f = 2 + 1 clover fermions for the CLS ensemble H101. The computed CS kernel shows good agreement with experimental extractions and previous lattice studies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Andrea Banfi, Basem Kamal El-Menoufi, Ryan Wood
Summary: We propose a new semi-numerical method for computing leading hadronization corrections to two-jet event shapes in e+e- annihilation. The dispersive approach is utilized in our formalism, controlling the magnitude of power corrections through suitable moments of an effective strong coupling. Our focus is on observables where the interplay between perturbative and non-perturbative effects is crucial in determining the power corrections. A universal treatment is presented for handling these observables, based on a suitable subtraction procedure.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
V Bertone, G. Bozzi, F. Hautmann
Summary: This research investigates hysteresis effects in the perturbative solution of renormalization group equations, proposing the use of resummation scales to account for theoretical uncertainties. Examples of the QCD running coupling and proton's parton distribution functions are presented, which are relevant to precision physics in the Large Hadron Collider and future collider experiments.
Article
Astronomy & Astrophysics
Hana Benslama, Yazid Delenda, Kamel Khelifa-Kerfa
Summary: This study investigates non-global and clustering logarithms in the distribution of the azimuthal decorrelation between two jets in e+e- -> dijet events. The leading global single logarithms in the distribution are calculated at one loop and to all orders. The non-global and clustering logarithms are also computed up to four loops at finite Nc and numerically resummed to all orders in the large-Nc approximation. The impact of non-global logarithms on the resummed distribution is found to be substantial in the anti-kt algorithm, but significantly smaller in the kt algorithm.
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Summary: The existence of BRST symmetry in non-perturbative QCD imposes constraints on the ghost and gluon spectra, but this interconnection is violated in actual data, indicating that continuum and current lattice formulations in Landau gauge represent two distinct realisations of Yang-Mills theory.
Article
Physics, Nuclear
Gorazd Cvetic, Reinhart Koegerler
Summary: We present an updated version of a QCD coupling that satisfies various physical conditions, from high momenta to low momenta, and apply it to the analysis of semihadronic tau decay and muon anomalous magnetic moment. By evaluating the Adler function and regulating V-channel higher-twist OPE terms, we achieve a correct value a(mu)(had(1)). This analysis leads to a restriction on the value of the QCD coupling constant alpha(s)( M-Z(2); (MS) over bar) between 0.1171 and 0.1180, ensuring acceptable fit quality to various sum rules.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Mattia Dalla Brida, Leonardo Giusti, Tim Harris, Davide Laudicina, Michele Pepe
Summary: This study presents a strategy based on the step-scaling technique to nonperturbatively study thermal QCD up to very high temperatures, specifically focusing on computing flavour non-singlet meson screening masses in a theory with three massless quarks. Chiral symmetry restoration is observed in the results, with deviations in meson screening masses not explained by the known leading term in the QCD coupling constant g. The research findings provide insight into the difficulties in matching non-perturbative lattice results at lower temperatures with the behavior at asymptotically high temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Stefano Camarda, Leandro Cieri, Giancarlo Ferrera
Summary: The study considers higher-order QCD corrections to high-mass systems production in hadron collisions, within the transverse-momentum subtraction formalism. A method is presented to consistently remove the linear power corrections in the transverse-momentum which appears when applying fiducial kinematical cuts on the final state system. By implementing this method at the Large Hadron Collider, perturbative predictions are obtained that are in agreement with those obtained with local subtraction formalisms up to the NNLO and provide numerical accuracy at the permille level at the N3LO.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Yuuki Hayashi, Yukinari Sumino, Hiromasa Takaura
Summary: The value of V-cb is determined using perturbative series for the inclusive semileptonic B decay width and the masses of bottomonium 1S states. The study highlights a significant difference in V-cb between two 1S mass schemes, primarily caused by the theoretical inadequacy in describing the observed mass splitting of bottomonium 1S states. The significance of non-perturbative effects in HQET with respect to the current perturbative accuracy is also examined.
Article
Physics, Particles & Fields
Jeremy Baron, Daniel Reichelt, Steffen Schumann, Niklas Schwanemann, Vincent Theeuwes
Summary: Soft-drop grooming of hadron-collision final states has the potential to reduce the impact of non-perturbative corrections, enabling more direct comparison of accurate perturbative predictions with experimental measurements. The study shows that soft-drop grooming is efficient in removing the underlying event, motivating future experimental measurements to be compared with precise QCD predictions and constrain non-perturbative models in Monte Carlo simulations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ming-xing Luo, Tong-Zhi Yang, Hua Xing Zhu, Yu Jiao Zhu
Summary: In this paper, we analytically calculate the perturbative matching coefficients for unpolarized quark and gluon Transverse-Momentum-Dependent (TMD) Parton Distribution Functions (PDFs) and Fragmentation Functions (FFs) through Next-to-Next-to-Next-to-Leading Order ((NLO)-L-3) in QCD. Our results provide important ingredients for the precision determination of TMD PDFs and FFs in current and future experiments.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yuri Kovchegov, Andrey Tarasov, Yossathorn Tawabutr
Summary: We calculate single-logarithmic corrections to the small-x flavor-singlet helicity evolution equations derived recently in the double-logarithmic approximation. These corrections are important in correcting the dominant powers of alpha(s) ln(2) (1/x) summed up by the double-logarithmic kernel from [1-3] at small Bjorken x values and with strong coupling constant alpha(s).
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yuri Kovchegov, M. Gabriel Santiago
Summary: This study investigates the small-x behavior of the quark Sivers function using a specific formalism, revealing that it is mainly influenced by the spin-dependent odderon contribution at small x. Additionally, new evolution equations are derived to provide insights into the structure of the quark Sivers function at small x.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Stefano Forte, Giovanni Ridolfi, Simone Rota
Summary: The study derived a general expression for the threshold resummation of transverse momentum distributions for processes with a colorless final state, extending existing results in the literature. The results hold to all logarithmic orders and provide explicit expressions at the next-to-next-to-leading log level. The agreement of the new result with existing NLL results and fixed next-to-leading order results for the Higgs transverse momentum distribution in gluon fusion was also verified.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Cesar Ayala, Xabier Lobregat, Antonio Pineda
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Review
Physics, Multidisciplinary
Antonio Pineda
Summary: This article reviews recent studies on the operator product expansion and gluon condensate, exploring methods such as perturbative expansion and hyperasymptotic expansion to increase accuracy. The results confirm expectations from renormalons and the operator product expansion.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Review
Physics, Nuclear
Clara Peset, Antonio Pineda, Oleksandr Tomalak
Summary: This article reviews determinations of the electric proton charge radius from low-energy observables and explores its relationship with effective field theories. It provides a unified framework for dealing with low-energy constants associated with proton's electromagnetic interactions, and discusses the model dependence of analyses. The prospects of constructing effective field theories for lepton-proton scattering experiments are also explored.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2021)
Article
Astronomy & Astrophysics
Cesar Ayala, Antonio Pineda
Summary: In this study, we obtain an improved determination of the normalization of the leading infrared renormalon in the Bjorken sum rule and provide estimates of higher order terms. By including the leading terminant associated with the first infrared renormalon, we compute the Bjorken sum rule with hyperasymptotic precision. The experimental data is fitted to the theoretical prediction and shows good agreement.
Proceedings Paper
Quantum Science & Technology
C. Ayala, G. Cvetic, A. Kotikov, B. G. Shaikhatdenov
XVIII WORKSHOP ON HIGH ENERGY SPIN PHYSICS, DSPIN-2019
(2020)
Proceedings Paper
Physics, Particles & Fields
Cesar Ayala, Xabier Lobregat, Antonio Pineda
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2020)
Article
Astronomy & Astrophysics
Cesar Ayala, Gorazd Cvetic, Lorena Gonzalez
Correction
Astronomy & Astrophysics
Cesar Ayala, S. V. Mikhailov, N. G. Stefanis
Article
Astronomy & Astrophysics
Cesar Ayala, Xabier Lobregat, Antonio Pineda