May 2024
Absence of static chiral magnetic effect in quantum chromodynamics
This paper demonstrates through calculations that the coefficient describing the chiral magnetic effect (CME) vanishes at equilibrium in quantum chromodynamics (QCD). This holds for both free quarks and full QCD simulations. A key requirement is using a gauge invariant regularization, and the paper explains why some prior calculations erroneously found a non-zero CME. T...
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Possible binding of nucleon, D meson, and D* meson
This paper investigates whether a three-body system composed of a nucleon, D meson, and D* meson can form a bound state. The authors use a framework called the Fixed Center Approximation, which models the system as a cluster of two particles (here either the ND* or ND pair) with the third particle (D or D* respectively) interacting with that cluster. They find there is ...
Construction of Soft Collinear Effective Theory from Quantum Chromodynamics
This paper provides a comprehensive introduction to effective field theory principles and applications. It explores the systematic construction of soft collinear effective theory (SCET) from quantum chromodynamics (QCD) to describe the interactions of collinear and soft particles at different energy scales.
April 2024
Analysis of quark and gluon spin-orbit alignment in protons
This paper analyzes the correlation between quark and gluon spin and orbital angular momentum inside protons. It finds they are anti-aligned, meaning opposite spins are paired with opposite orbital motion. A new sum rule is derived to characterize momentum structure.
Non-supersymmetric duality cascade of bifundamental QCD via semiclassics
We apply a novel semiclassical approach with baryon-'t Hooft flux on R^2 x T^2 to study the bifundamental QCD (QCD(BF)) of different ranks. We derive the 2d effective theory from dilute gas approximation of center vortices. This determines the phase diagram under adiabatic continuity. We justify the non-supersymmetric duality cascade between different QCD(BF)s, conjectu...
Protecting quantum simulation of lattice gauge theories
This paper presents protocols to simulate the dynamics of SU(3) lattice gauge theory while protecting against errors from faulty quantum devices. The loop-string-hadron framework avoids imposing non-Abelian symmetries, relying instead on simpler Abelian symmetries. Protecting these global or local Abelian symmetries confines dynamics to the physical state space. This wo...
QCD corrections to gluon fusion ZZ production
This paper calculates the complete next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the loop-induced production of Z boson pairs (ZZ) via gluon fusion. It includes the effects of both massless quarks and the top quark mass. The authors combine analytical calculations with numerical computations to obtain the full two-loop virtual corrections. They...
Probing gluon distribution in protons
The paper explores how future measurements of vector meson production at large transverse momentum could help constrain models of the spatial distribution of gluons within protons. Different non-Gaussian models for the proton's gluon density profile are incorporated into a theoretical framework and shown to give distinct predictions that future experiments could disting...
March 2024
Quark model explains axial-vector charm-strange mesons
A published quark model study shows the axial-vector charm-strange mesons Ds1(2536) and Ds1(2460) naturally emerge without fine-tuning, arguing against a molecular interpretation. Additional mesons and lattice results also do not support the molecular scenario.
Renormalization of soft quark contributions to Higgs production in photon fusion and gluon fusion
This paper calculates the one-loop renormalization kernels of soft operators that appear in subleading-power Higgs production form factors mediated by a b-quark loop, for both photon fusion and gluon fusion processes. It provides an IR/rapidity divergence-free definition of the gluon fusion soft operator and shows a consistent factorization theorem can be recovered. It ...
Leading corrections to spherocity shape
This paper analytically derives the next-to-leading order corrections from quantum chromodynamics to the spherocity event shape variable distribution. It investigates the origin and structure of the leading logarithms at leading power and next-to-leading power. The study utilizes graphical representations and phase space analysis to provide insights into the unique beha...
Constructing interactions for exotic particle representations in QCD
This paper introduces a systematic procedure for building complete, independent sets of interactions between particles transforming under higher-dimensional representations (beyond triplets and octets) of the SU(3) color gauge group of quantum chromodynamics (QCD). It uncovers errors in previous results for exotic particle interactions, beginning with models containing ...
January 2024
Measurements of inclusive eta meson production in electron-positron annihilation
This paper reports measurements of the production rate of eta mesons over a range of collision energies from 2 to 3.7 GeV. These measurements show significant differences from theoretical predictions using existing fragmentation functions. A new quantum chromodynamics analysis is performed incorporating higher-order effects and higher twist contributions, allowing a uni...
December 2023
Non-factorizable photon emission in Λb to Λ decays
This paper calculates a class of non-factorizable contributions to the Λb to Λ l+ l- decay, specifically where a virtual photon is emitted from a light quark. To perform the calculation, new 'soft functions' generalizing the standard Λb light-cone distribution amplitudes are introduced. Numerical results estimate these non-local form factors using light-cone sum rules.
Quantum Chromodynamics: A Brief Overview
Quantum chromodynamics (QCD) is the theory describing the strong nuclear force and interactions between quarks and gluons. This article summarizes key aspects of QCD including the running coupling constant, quark masses, structure of QCD predictions, experimental QCD studies involving jets and event shapes, and determinations of the strong coupling constant alpha_s.
Four-hadron molecules composed of charmed mesons and kaons
This paper investigates the theoretical existence and properties of DDKK and DDK bar K bar four-hadron bound states, assuming the Ds0*(2317) meson is a DK molecule. Binding energies, decay widths, subsystem sizes, and dominant interactions are analyzed using the Gaussian Expansion Method. Key findings are binding energies of 138-155 MeV for DDKK and 123-163 MeV for DDK ...
November 2023
Nucleon screening masses at high temperature
This paper computes the screening masses of nucleon-like particles across a wide range of high temperatures in lattice QCD. The computations use improved Wilson fermions and exploit a novel strategy to access extremely high temperatures up to around 160 GeV. The screening masses show clear deviations from free theory even at the highest temperatures. The degeneracy of p...
Bc decays to charmonium states
This paper analyzes Bc meson decays to charmonium states like J/psi and etac (S-wave) and chicJ and hc (P-wave). Relations between form factors for these transitions are derived using heavy quark symmetry. This allows calculation of several form factors from lattice QCD inputs. Ratios of decay rates can test conventional vs exotic nature of chic1(3872).
James Webb Space Telescope's sensitivity to decaying dark matter
This paper forecasts the end-of-mission sensitivity of the James Webb Space Telescope to detect the decay of dark matter particles called axions into photons. It finds that by searching for unassociated emission lines in blank sky observations, JWST can detect or rule out axions over an order of magnitude in mass range from 0.18 to 2.6 eV. This covers unexplored paramet...
Strong coupling from thrust with reduced model dependence
This paper studies the strong coupling constant alpha_s and leading non-perturbative parameter Omega_1 extracted from predictions of the e+e- collider event shape thrust. The authors calculate thrust distributions using advanced perturbative techniques and match to data. They test the impact of varying renormalon cancellation schemes and perturbative scale choices. Fits...
Fragmentation of quarks and gluons inside jets
This paper presents a theoretical framework for analyzing the fragmentation of quarks and gluons into hadrons inside jets. It uses soft-collinear effective theory to derive factorization theorems and compute fragmenting jet functions (FJFs). The FJFs describe the probability distribution for a quark or gluon to fragment into a hadron carrying a certain fraction of the j...
August 2023
Quarkonium Production in Lead-Lead Collisions
This paper presents the first study modeling quarkonium photoproduction in lead-lead collisions at the Large Hadron Collider. It uses a framework of collinear factorization and perturbative quantum chromodynamics to make predictions. The results show significant uncertainty from choices of scale but match data within nuclear parton distribution function uncertainties. T...
Lattice Boltzmann stability via asymptotic freedom
This paper shows that unconditional stability of lattice Boltzmann fluid simulations requires 'asymptotic freedom' - the equilibrium distribution must have vanishing pressure at maximal flow velocity. This parallels asymptotic freedom in quantum chromodynamics. For common lattice Boltzmann models of nearly-incompressible flow, the entropy-maximizing equilibrium distribu...
July 2023
Predicting exotic hybrid mesons from QCD
This paper predicts the existence and properties of hypothetical particles called 'hybrid mesons' using calculations from quantum chromodynamics (QCD). Hybrid mesons contain both quark and gluon components, giving them unique quantum numbers not possible for normal mesons. The authors calculate the mass and other properties of particular hybrids with quantum numbers 'J^...
January 2023
The melting of quarkonium: How the quark-gluon plasma reveals the inner workings of matter
This paper reviews recent advances in using open quantum systems methods to model the melting of quarkonium particles in the quark-gluon plasma. By treating quarkonium as an open quantum system interacting with the plasma environment, the authors can predict suppression patterns and make comparisons with experimental data from heavy-ion collisions.
April 2022
Graph neural networks enable anomaly detection in particle collisions with theoretical consistency
This paper develops a graph neural network architecture for anomaly detection in particle collision data that maintains infrared and collinear safety, a key requirement for theoretical consistency. The method condenses information about particle interactions into graph representations and identifies anomalies by how well new data matches learned patterns, outperforming ...
October 2020
Demystifying top quark production at extreme energies
This paper studies the production of top quark pairs, the heaviest known elementary particles, in ultra-high energy proton collisions. It calculates cross sections using quantum chromodynamics and effective field theory to better understand particle behavior in the hot quark-gluon plasma formed at these energies. The results provide insight into physics beyond the Stand...
September 2019
The Dawn of Matter: Unraveling the Origins of Our Material Universe
This paper proposes that the observed matter-antimatter asymmetry of our universe arose from baryon formation in the non-equilibrium conditions following the Big Bang. By applying non-equilibrium quantum chromodynamics, the author derives a formula to model the first-time formation of baryons like protons and neutrons from the quark-gluon plasma in the early universe.
July 2018
Unveiling the Quantum Mysteries of Massive Quarks
This paper calculates quantum corrections to interactions between massive quarks and vector, axial-vector, scalar, and pseudoscalar currents. By evaluating thousands of Feynman diagrams, the authors have significantly advanced theoretical understanding of quark behavior and interactions at the quantum level.