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Article
Physics, Nuclear
Xuan-Gong Wang et al.
Summary: We analyze the impact of a dark photon on the rare kaon decay K-L -> pi(0) nu(nu) over bar. The couplings between the dark photon and standard model particles are derived explicitly in terms of the dark photon mass and mixing parameter. We find that the dark photon correction to the standard model branching ratio Br(K-L -> pi(0) nu(nu) over bar) is no more than a few percent in the relevant region.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
X. Fan et al.
Summary: The accuracy of the electron magnetic moment measurement has been improved by 2.2 times and reaches one part per thousand of the predicted value. This test could be improved by an order of magnitude if the uncertainty from discrepant measurements of the fine structure constant alpha is eliminated. The new measurement and the standard model theory predict alpha-1 value in accordance with an uncertainty 10 times smaller than the current disagreement between measured alpha values.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Jun Gao et al.
Summary: Recasting phenomenological Lagrangians in terms of SM effective field theory (SMEFT) allows for the connection between potential BSM physics at high energies and experimental signatures at lower energies. This study extends the CT18 global analysis framework to jointly fit the Wilson coefficients of SMEFT operators and the parton distribution functions (PDFs), providing consistent constraints on possible BSM physics effects. The use of machine-learning techniques, such as neural networks, enhances the efficiency of the global fits in scanning the full PDF+SMEFT parameter space.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Zahari Kassabov et al.
Summary: This study assesses the impact of top quark production at the LHC on global analyses of parton distributions (PDFs) and Wilson coefficients in the SMEFT, both separately and in a joint interpretation. The study uses the broadest top quark dataset to date, including all available measurements based on the full Run II luminosity. The research determines constraints on the large-x gluon PDF and evaluates its consistency with other gluon-sensitive measurements. It also carries out a SMEFT interpretation of the dataset, resulting in bounds on 25 Wilson coefficients modifying top quark interactions.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Shayan Iranipour et al.
Summary: This study presents a new methodology that allows for the simultaneous determination of the Parton Distribution Functions (PDFs) of the proton and any parameters that determine theoretical predictions. The methodology is based on an extension of the NNPDF4.0 neural network architecture, which enables the determination of multiple parameters simultaneously. The study demonstrates the capabilities of this methodology by fitting PDFs with a subset of Wilson coefficients within the Standard Model Effective Field Theory framework, and shows its potential for extension to other precision parameters in the standard model.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
A. W. Thomas et al.
Summary: The paper examines the sensitivity of the parity-violating electron scattering asymmetry to the properties of a dark photon, and explores its impact on both elastic and deep-inelastic scattering. With recent advancements in experimental capabilities, there is potential for discovering new physics through PVES, as well as a potential for altering our understanding of atomic nuclei, neutron stars, and parton distribution functions through the existence of a dark photon.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Matthew McCullough et al.
Summary: We study the sensitivity of the High-Luminosity LHC to a light baryonic dark photon B, primarily coupled to quarks, and demonstrate its potential in determining competitive bounds on dark photon parameter space by analyzing its effect on the tails of Drell-Yan invariant mass distributions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Nuclear
Jun Gao et al.
Summary: This article studies the dependence of the transverse mass distribution of charged leptons and the missing energy on parton distributions. The authors compare the effects of different PDFs on the distribution and suggest using up-to-date PDFs for analyzing experimental data to better understand the PDF uncertainties in W boson mass measurements.
Article
Astronomy & Astrophysics
Bin Yan
Summary: In this work, the authors propose using polarized lepton cross section and single-spin asymmetry in neutral current DIS process to probe the properties of the dark photon. They find that the mixing parameter epsilon can be constrained to be less than 0.02 when the dark photon mass is less than 10 GeV at HERA. The upper limit of epsilon could be further improved at the EIC with high integrated luminosity and electron beam polarization. Additionally, a similar upper limit for epsilon can be obtained from the single-spin asymmetry measurement.
Article
Astronomy & Astrophysics
A. W. Thomas et al.
Summary: This study presents an analysis of experimental data on parity violating electron scattering and atomic parity violation, taking into account the effects of a dark photon. The results indicate that the presence of a heavy dark photon can explain the experimental data and alleviate the tension between predictions and observations.
Article
Astronomy & Astrophysics
N. T. Hunt-Smith et al.
Summary: This article reviews various methods for estimating uncertainties in quantum correlation functions, and compares their results. It found that using neural network approaches may inflate uncertainties.
Article
Astronomy & Astrophysics
John Collins et al.
Summary: There have been recent debates on whether (MS) over bar parton densities comply with positivity bounds and whether the bounds should be applied as constraints on global fits and nonperturbative calculations. A recent paper seems to contradict earlier work by providing a proof of positivity. However, after examining the derivation, it is found that the primary failure lies in the assumption that the bare parton density functions are always positive. This issue is related to the use of dimensional regularization and the track B approach, which can lead to wrong results of phenomenological importance.
Article
Astronomy & Astrophysics
A. W. Thomas et al.
Summary: We investigate constraints on the dark photon arising from deep inelastic scattering data. By extracting parton distribution functions and considering the variations of the dark photon mixing parameter and mass, as well as the effects of vector-meson dominance, exclusion limits on the kinetic mixing parameter of the dark photon are inferred.
Article
Physics, Multidisciplinary
Graham D. Kribs et al.
Summary: The deep inelastic scattering of e(+/-) off protons is sensitive to contributions from dark photon exchange. Utilizing HERA data fit to HERA's parton distribution functions (PDFs), a model-independent bound on the kinetic mixing between hypercharge and the dark photon is obtained, improving on previous bounds. The proposed Large Hadron Electron Collider is anticipated to provide substantial improvements in probing the effects of a dark photon throughout its mass range, including higher masses up to 100 TeV.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Nuclear
Matt Graham et al.
Annual Review of Nuclear and Particle Science
(2021)
Article
Multidisciplinary Sciences
Sz. Borsanyi et al.
Summary: The standard model of particle physics describes the majority of experiments and observations involving elementary particles, with a long-standing discrepancy concerning the anomalous magnetic moment of the muon. Ongoing experiments aim to reduce measurement errors, theoretically attributed to the leading-order hadronic vacuum polarization contribution, to distinguish between experimental measurements and predictions. The developed methods using ab initio quantum chromodynamics and quantum electrodynamics simulations favor experimentally measured values over those obtained using dispersion methods, with potential for increased precision as computer technology advances.
Article
Physics, Particles & Fields
Admir Greljo et al.
Summary: The study assessed for the first time the interplay between PDFs and EFT effects for high-mass Drell-Yan processes, finding the interaction to be moderate for the current dataset but a significant challenge for EFT analyses at the HL-LHC.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
C. Cocuzza et al.
Summary: In a Bayesian Monte Carlo framework, researchers conducted a global QCD analysis on unpolarized parton distributions, incorporating new data from the STAR Collaboration at RHIC and the SeaQuest experiment at Fermilab. The SeaQuest data were shown to significantly reduce uncertainties and support the notion of an enhanced light antiquark sea at specific momentum fractions, in accordance with nonpertubative calculations based on chiral symmetry breaking in QCD.
Article
Physics, Multidisciplinary
R. Aaij et al.
PHYSICAL REVIEW LETTERS
(2020)
Review
Physics, Multidisciplinary
T. Aoyama et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Multidisciplinary Sciences
Leo Morel et al.
Article
Physics, Particles & Fields
Peter Athron et al.
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Physics, Multidisciplinary
Stefano Carrazza et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
D. Banerjee et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Particles & Fields
Rabah Abdul Khalek et al.
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Astronomy & Astrophysics
E. Moffat et al.
Article
Physics, Particles & Fields
L. A. Harland-Lang et al.
EUROPEAN PHYSICAL JOURNAL C
(2016)
Article
Physics, Particles & Fields
David Curtin et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2015)
Article
Multidisciplinary Sciences
D. Wang et al.
Article
Astronomy & Astrophysics
Hooman Davoudiasl et al.
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Physics, Multidisciplinary
Hooman Davoudiasl et al.
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Particles & Fields
Anson Hook et al.
ADVANCES IN HIGH ENERGY PHYSICS
(2011)
Article
Astronomy & Astrophysics
Maxim Pospelov
