Article
Physics, Particles & Fields
Bernat Capdevila, Paolo Gambino, Soumitra Nandi
Summary: This study computes the O(alpha (s)) corrections to the Wilson coefficients of dimension five operators in inclusive semileptonic B decays in the limit of a massless final quark. The results are consistent with reparametrization invariance and previous findings on total width, while also enhancing the constraints on shape functions in these decays.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Zhou Rui, Ya Li, Hsiang-nan Li
Summary: In this study, four-body decays B-(s) -> (K pi)(S/P)(K pi)(S/P) around the K-*(892) resonance region were investigated using perturbative QCD approach. Significant S-wave contributions were observed in B-s modes, with implications for polarization fractions and CP asymmetries. The results will be tested with precise data from B factories in the near future.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tadeusz Janowski, Ben Pullin, Roman Zwicky
Summary: This research presents the first analytic O(alpha(s))-computation at twist-1,2 of the (B) over bar (u,d,s) -> gamma form factors within the framework of sum rules on the light-cone. The results show the significance of these form factors in various decay processes and provide predictions for branching ratios.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Chao Wang, Yu-Ming Wang, Yan-Bing Wei
Summary: In this study, we use the QCD factorization formalism to calculate the form factors of the B-u(-) -> gamma* l (nu) over bar (l) decay with an off-shell photon state possessing virtuality of order m(b) Lambda(QCD) and m(b)(2). We then perform perturbative resummation for the enhanced logarithms of m(b)/Lambda(QCD) and derive the soft-collinear factorization formulae for subleading power corrections. Additionally, we construct a set of angular observables for the full differential distribution of the B-u(-) -> l'(l) over bar 'l (nu) over bar (l) decays and analyze their observables at the LHCb and Belle II experiments.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Kirill Boguslavski, Babak S. Kasmaei, Michael Strickland
Summary: In this study, the imaginary part of the heavy-quark potential was extracted using classical-statistical simulations, with comparisons made to continuum expressions and lattice perturbation theory calculations. The results showed little sensitivity to lattice spacing at small values of a certain variable, and quantified non-perturbative long-range corrections for large quark-antiquark separations. This work laid the groundwork for extracting the imaginary part of the heavy-quark potential in expanding non-equilibrium Yang-Mills plasma.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Matteo Fael, Fabian Lange, Kay Schoenwald, Matthias Steinhauser
Summary: The described method allows for numerical computation of multi-loop integrals in the entire kinematic range of the dimensionless parameter x, without the need for any special form, providing results suitable for fast numerical evaluation and accurate enough for phenomenological applications. It was applied to four-loop on-shell integrals, computing coefficient functions in the mass relation with eight color structures. Analytic results were obtained for these coefficient functions using harmonic polylogarithms and iterated integrals, enabling validation of numerical accuracy.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Colomba Brancaccio, Michal Czakon, Terry Generet, Michael Kraemer
Summary: We have computed the fragmentation functions for the production of a Higgs boson at O(y(t)(2)alpha(s)), deriving the relevant splitting functions at the same perturbative order. Our results can be employed to calculate differential cross sections with arbitrary top-quark and Higgs-boson masses, and to resum logarithms of the form ln(p(T)/m) to next-to-leading-logarithmic accuracy by solving the DGLAP equations at large transverse momentum p(T).
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Hui-Hui Duan, Yong-Lu Liu, Ming-Qiu Huang
Summary: In this study, the semileptonic decay processes of Λ(b) -> Λ(c) are analyzed using the light-cone sum rule approach. The form factors of the Λ(b) baryon transition matrix element are calculated using the light-cone distribution amplitudes obtained from the QCD sum rule in the heavy quark effective field theory framework. The results are consistent with the newest experimental result and other theoretical calculations and predictions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Yizhuang Liu, Maciej A. Nowak, Ismail Zahed
Summary: In this study, the researchers revisit the three nonstrange pentaquarks predicted using holographic dual description, showing that in the heavy quark limit, the pentaquarks with internal heavy quark spin are all degenerate. The holographic pentaquarks are dual to an instanton bound to heavy mesons in bulk, without the shortcomings related to the nature of the interaction and the choice of the hard core inherent to the molecular constructions. Additionally, the study explicitly derived spin-spin and spin-orbit couplings arising from next to leading order in heavy quark mass to lift the internal spin degeneracy.
Article
Astronomy & Astrophysics
S. P. Baranov, A. Lipatov, A. A. Prokhorov
Summary: The study found that under LHC conditions, the production processes associated with J/psi mesons have new significant contributions, which significantly reduce the gap between theoretical and experimental results.
Article
Physics, Multidisciplinary
Shi Chen, Kenji Fukushima, Yusuke Shimada
Summary: In this study, the Polyakov loop potential at high temperature with finite imaginary angular velocity is computed perturbatively. It is demonstrated analytically that the imaginary angular velocity induces the perturbatively confined phase, serving as a new approach to investigate confinement physics. Moreover, a possible phase diagram is discussed, showing adiabatic continuity from perturbative confinement to the confined phase at low temperature, and a subtle point is mentioned regarding the analytical continuation from imaginary to real angular velocity by imposing a causality bound.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Mei Sen Gao, Shu Run Yuan, Jun Gao
Summary: The study focuses on determining the top-quark mass using leptonic observables in t-channel single top-quark production at the LHC, showcasing the sensitivity of transverse momentum of the charged lepton on the input top-quark mass. Predictions at NNLO in QCD with different corrections are presented, along with proposals to reduce SM backgrounds using charge weighted distributions for measurement. Projections for (HL-)LHC show promising results with a theoretical uncertainty of about 1 to 2 GeV on the extracted top-quark mass.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
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, Particles & Fields
Admir Greljo, Nudzeim Selimovic
Summary: This study presents the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the LHC, with NLO QCD and QED corrections showing similar size but opposite signs. The NLO K-factors for a wide range of scalar leptoquark masses, flavors, and charges are calculated, while theoretical uncertainties due to scale variations and limited knowledge of parton distribution functions are quantified. The study also discusses the disentanglement of leptoquark flavor interactions through the interplay between different production channels.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
M. Laine
Summary: The study of the diffusion and kinetic equilibration of heavy quarks within a hot QCD medium benefits from understanding the coloured Lorentz force acting on them. By determining 1-loop matching coefficients for the electric and magnetic parts of a Lorentz force, it enables a lattice study of a color-magnetic 2-point correlator.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)