Article
Astronomy & Astrophysics
A. Desiderio, R. Frezzotti, M. Garofalo, D. Giusti, M. Hansen, V Lubicz, G. Martinelli, C. T. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo
Summary: The study presents a nonperturbative lattice calculation method for accurately predicting the leptonic decay rates of pseudoscalar mesons, distinguishing contributions from different factors in the amplitude, and also focuses on the evaluation of leptonic decay rates with emission of a hard photon.
Article
Physics, Multidisciplinary
Norman Christ, Xu Feng, Luchang Jin, Cheng Tu, Yidi Zhao
Summary: We extend the application of lattice QCD to calculate the rare decay pi(0) -> e(+)e(-) mediated by two photons. By combining Minkowski-and Euclidean-space methods, we are able to directly calculate the complex amplitude describing this decay from the underlying theories. The results provide more accurate values for various parameters and lay the foundation for further calculations on the two-photon-mediated decay amplitude contributing to the rare decay K -> mu(+)mu(-).
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Roman Zwicky
Summary: This review focuses on important aspects of QED-corrections to hadronic decays, specifically emphasizing conceptual points such as infrared divergences and structure dependence. Different hadronic decay processes exhibit (non)-cancellation of hard-collinear logs, such as lnm(l) and lnm(p), as a significant characteristic of structure dependence.
Article
Optics
Konstantin N. Lyashchenko, Oleg Yu Andreev, Deyang Yu
Summary: In this theoretical study, the process of two-electron one-photon (TEOP) transitions in a He-like sequence of atomic ions from boron to uranium is considered. Transition probabilities and energies are calculated within the Quantum Electrodynamics (QED) theory, with calculations performed in various gauges. The intensity ratios between TEOP transitions and other major transitions are presented.
Article
Astronomy & Astrophysics
Norman H. Christ, Xu Feng, Lu-Chang Jin, Christopher T. Sachrajda, Tianle Wang
Summary: Lattice QCD calculations have achieved subpercent precision and isospin-breaking corrections, including QED effects, must be considered for accurate determination of fundamental quantities from experimental measurements. This paper presents a new theoretical framework, based on infinite-volume reconstruction (IVR), for calculating electromagnetic corrections to leptonic decay widths. The IVR method allows for nonperturbative determination of required matrix elements from lattice QCD computations with exponentially small finite-volume uncertainties. The framework also demonstrates potential for determining QED effects in semileptonic kaon decays.
Article
Multidisciplinary Sciences
Yu Meng, Xu Feng, Chuan Liu, Teng Wang, Zuoheng Zou
Summary: In this study, we performed a lattice QCD calculation of the gc! 2c decay width using a model-independent method. Our results significantly differ from the reported value by the Particle Data Group, and we compared our findings with previous theoretical predictions and experimental measurements.
Article
Physics, Multidisciplinary
Martin Hoferichter, Thomas Teubner
Summary: Higher-order hadronic corrections to the anomalous magnetic moment of the muon have been evaluated, and it has been found that the remaining hadronic effect at O(alpha(4)), in the form of double-bubble topologies, has a negligible impact on the final precision of the Fermilab g-2 experiment.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Nuclear
Long-Sheng Lu
Summary: This work focuses on calculating the sub-leading power contributions to radiative leptonic D ->gamma lv decay, providing analytic expressions and error estimations. The study reveals significant effects of the next-to-leading power contributions on the form factors under specific conditions, making it challenging to extract the inverse moment of the D-meson distribution amplitude.
Article
Astronomy & Astrophysics
Xin-Yu Tuo, Xu Feng, Lu-Chang Jin, Teng Wang
Summary: We develop a methodology using lattice QCD to compute the decay width of K -> l nu(l)l '(+)l '(-) and present an exploratory study. By employing the scalar function method and the infinite-volume reconstruction method, we consider the momentum dependence of the decay amplitude and reduce systematic errors. Our results show the potential of lattice QCD in improving the Standard Model prediction for the K -> l nu(l)l '(+)l '(-) decay width.
Article
Astronomy & Astrophysics
Ariel Edery
Summary: This study discusses the effects of using wave packets to represent localized free particles on decay rates and clock behavior in quantum field theory. It is found that a wave packet clock does not behave exactly like a typical clock under Lorentz boosts, with its velocity having a spread. However, the wave packet clock represents a one-particle state in QFT and does not violate Lorentz symmetry, as it is a consequence of the requirements of special relativity, quantum mechanics, and localized free particles.
Article
Physics, Particles & Fields
Martin Beneke, Philipp Boeer, Gael Finauri, K. Keri Vos
Summary: The QCD x QED factorization is applied to study two-body non-leptonic and semi-leptonic B decays with heavy-light final states. It is found that including QED effects does not change the general factorization structure, with corrections at the sub-percent level in the amplitude level. Phenomenological implications of QED effects on discrepancies between theory and experimental data are discussed, particularly in relation to non-leptonic over semi-leptonic decay rate ratios.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Nuclear
Zuoheng Zou, Yu Meng, Chuan Liu
Summary: In this study, a lattice QCD calculation of the chi(c0) -> 2 gamma decay width is performed using a model-independent method. The result is obtained after a continuum extrapolation, with a compatibility to experimental results within 1.3 sigma. Potential improvements for lattice calculations in the future are also discussed.
Article
Astronomy & Astrophysics
Matthias Heller, Niklas Keil, Marc Vanderhaeghen
Summary: We studied the leading-order QED radiative corrections to the timelike Compton scattering process and found that they range from 5%-10% in the low-energy regime and around 20% in the high-energy regime. These corrections nearly cancel out in both dilepton forward-backward asymmetry and photon beam helicity asymmetry, making them ideal observables for extracting the real and imaginary parts of the TCS amplitude. Our results demonstrate the sensitivity of these asymmetries to GPD parametrizations in recent TCS experiments at CLAS12@JLab.
Article
Physics, Particles & Fields
Peter Boyle, Matteo Di Carlo, Felix Erben, Vera Guelpers, Maxwell T. Hansen, Tim Harris, Nils Hermansson-Truedsson, Raoul Hodgson, Andreas Juttner, Fionn O. Hogain, Antonin Portelli, James Richings, Andrew Zhen Ning Yong
Summary: In this study, the researchers performed the first RBC/UKQCD lattice calculation for isospin-breaking corrections in weak processes. It was found that, if the finite-volume systematics can be reduced, the error from isospin-breaking corrections may be sub-dominant in the final precision of the ratio of CKM matrix elements.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Oleksandr Tomalak, Qing Chen, Richard J. Hill, Kevin S. McFarland, Clarence Wret
Summary: Control over quantum electrodynamics radiative corrections is crucial for accurate determination of neutrino oscillation probabilities. We provide a theoretical foundation for calculating these corrections and investigate the impact of QED corrections on neutrino scattering cross sections.
Review
Physics, Multidisciplinary
T. Aoyama, N. Asmussen, M. Benayoun, J. Bijnens, T. Blum, M. Bruno, I Caprini, C. M. Carloni Calame, M. Ce, G. Colangelo, F. Curciarello, H. Czyz, I Danilkin, M. Davier, C. T. H. Davies, M. Della Morte, S. Eidelman, A. X. El-Khadra, A. Gerardin, D. Giusti, M. Golterman, Steven Gottlieb, V Gulpers, F. Hagelstein, M. Hayakawa, G. Herdoiza, D. W. Hertzog, A. Hoecker, M. Hoferichter, B-L Hoid, R. J. Hudspith, F. Ignatov, T. Izubuchi, F. Jegerlehner, L. Jin, A. Keshavarzi, T. Kinoshita, B. Kubis, A. Kupich, A. Kupsc, L. Laub, C. Lehner, L. Lellouch, I Logashenko, B. Malaescu, K. Maltman, M. K. Marinkovic, P. Masjuan, A. S. Meyer, H. B. Meyer, T. Mibe, K. Miura, S. E. Muller, M. Nio, D. Nomura, A. Nyffeler, V Pascalutsa, M. Passera, E. Perez del Rio, S. Peris, A. Portelli, M. Procura, C. F. Redmer, B. L. Roberts, P. Sanchez-Puertas, S. Serednyakov, B. Shwartz, S. Simula, D. Stoeckinger, H. Stoeckinger-Kim, P. Stoffer, T. Teubner, R. Van de Water, M. Vanderhaeghen, G. Venanzoni, G. von Hippel, H. Wittig, Z. Zhang, M. N. Achasov, A. Bashir, N. Cardoso, B. Chakraborty, E-H Chao, J. Charles, A. Crivellin, O. Deineka, A. Denig, C. DeTar, C. A. Dominguez, A. E. Dorokhov, V. P. Druzhinin, G. Eichmann, M. Fael, C. S. Fischer, E. Gamiz, Z. Gelzer, J. R. Green, S. Guellati-Khelifa, D. Hatton, N. Hermansson-Truedsson, S. Holz, B. Horz, M. Knecht, J. Koponen, A. S. Kronfeld, J. Laiho, S. Leupold, P. B. Mackenzie, W. J. Marciano, C. McNeile, D. Mohler, J. Monnard, E. T. Neil, A. Nesterenko, K. Ottnad, V Pauk, A. E. Radzhabov, E. de Rafael, K. Raya, A. Risch, A. Rodriguez-Sanchez, P. Roig, T. San Jose, E. P. Solodov, R. Sugar, K. Yu Todyshev, A. Vainshtein, A. Vaquero Aviles-Casco, E. Weil, J. Wilhelm, R. Williams, A. S. Zhevlakov
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Physics, Particles & Fields
Guido Martinelli, Silvano Simula, Ludovico Vittorio
Summary: This study determines the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V-ub| using a dispersion matrix approach and obtains accurate values through experimental data. The study also provides theoretical estimates for other decay rates and asymmetries.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Davide Giusti, Christopher F. Kane, Christoph Lehner, Stefan Meinel, Amarjit Soni
Summary: This study presents lattice-QCD methods for determining form factors in radiative-leptonic decays of pseudoscalar mesons. Numerical results for the decay D+s -> e+ nu gamma are provided. The study focuses on controlling systematic errors caused by unwanted excited states and exponentials in the calculation. Different methods, such as the 3D and 4D sequential propagators, are analyzed individually and in combination to improve control over these errors. The optimal combination of methods yields accurate results for the form factors in the entire kinematic range.
Article
Astronomy & Astrophysics
G. Martinelli, S. Simula, L. Vittorio
Summary: Using a novel unitarity-based approach, the Cabibbo-Kobayashi-Maskawa matrix element IVcbI is extracted from exclusive semileptonic B - D(*) decays. This approach allows for a full nonperturbative determination of the relevant hadronic form factors and avoids constraining their shape using experimental data. The extracted values are consistent with previous measurements and help to investigate lepton flavor universality.
Article
Astronomy & Astrophysics
G. Martinelli, S. Simula, L. Vittorio
Summary: This study provides the first nonperturbative determination of the hadronic susceptibilities that constrain the form factors in the semileptonic B -> D-(*())l nu(l) transitions. By evaluating moments of suitable two-point correlation functions obtained on the lattice, the study calculates the longitudinal and transverse susceptibilities of vector and axial-vector polarization functions at different pion masses and lattice spacings. The physical values of the scalar, vector, pseudoscalar, and axial susceptibilities are obtained using the Extended Twisted Mass Collaboration (ETMC) ratio method.
Article
Astronomy & Astrophysics
R. Frezzotti, G. Gagliardi, V Lubicz, G. Martinelli, F. Sanfilippo, S. Simula
Summary: The low-energy constant l(7) is evaluated through lattice QCD calculations, improving its uncertainty which currently exceeds 50%. Utilizing the RM123 approach and the rotated twisted-mass scheme, the study finds that the matrix element method outperforms the mass method in terms of statistical accuracy. The determination of l(7) is found to be 2.5(1.4) x 10(-3), in agreement with and improving upon previous calculations.
Article
Astronomy & Astrophysics
M. Di Carlo, G. Martinelli, M. Naviglio, F. Sanfilippo, S. Simula, L. Vittorio
Summary: This work discusses the nonperturbative determination of the momentum dependence of form factors in semileptonic decays using unitarity and analyticity constraints. The method allows for the extraction of form factors at low momentum transfer q2 from those computed on the lattice at large q(2) without assumptions about their q(2)-dependence. The approach is particularly useful for exclusive semileptonic B-meson decays where direct calculation of form factors at low q(2) is challenging.
Article
Astronomy & Astrophysics
R. Frezzotti, M. Garofalo, V Lubicz, G. Martinelli, C. T. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo
Summary: A comparison of experimental data and theoretical predictions show discrepancies in certain cases, particularly at large photon energies. These observations indicate the need for further improvements and studies on the theoretical and experimental measurements of these structure-dependent form factors.
Article
Astronomy & Astrophysics
A. Desiderio, R. Frezzotti, M. Garofalo, D. Giusti, M. Hansen, V Lubicz, G. Martinelli, C. T. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo
Summary: The study presents a nonperturbative lattice calculation method for accurately predicting the leptonic decay rates of pseudoscalar mesons, distinguishing contributions from different factors in the amplitude, and also focuses on the evaluation of leptonic decay rates with emission of a hard photon.
Article
Astronomy & Astrophysics
D. Giusti, S. Simula
Article
Astronomy & Astrophysics
M. Di Carlo, G. Martinelli, D. Giusti, V Lubicz, C. T. Sachrajda, F. Sanfilippo, S. Simula, N. Tantalo
Article
Astronomy & Astrophysics
D. Giusti, V. Lubicz, G. Martinelli, F. Sanfilippo, S. Simula
