Article
Astronomy & Astrophysics
Stephen P. Martin
Summary: In this study, the three-loop corrections at leading order in QCD to the physical masses of the Higgs, W, and Z bosons in the Standard Model were found. The results were obtained as functions of the MS Lagrangian parameters and using the tadpole-free scheme for the vacuum expectation value. The computed mass dependences on the renormalization scale were found to be smaller than current experimental uncertainties in each case. These results are now included in the Standard Model in Dimensional Regularization computer code.
Article
Astronomy & Astrophysics
F. S. Gama
Summary: In this paper, we discuss a higher-derivative generalization of supersymmetric quantum electrodynamics in N=2, d=3 superspace, where the higher-derivative operator is a polynomial function of the d'Alembertian. We use the background field quantization in a higher-derivative R & xi; gauge to calculate the superfield effective potential up to two loops in the Kahlerian approximation, which is obtained in a closed form and expressed in terms of elementary functions.
Article
Physics, Multidisciplinary
Claude Duhr, Bernhard Mistlberger, Gherardo Vita
Summary: In this study, we obtain the quark and gluon rapidity anomalous dimension up to fourth order in QCD and make use of the soft and rapidity anomalous dimension correspondence, combined with the recent determination of the N4LO threshold anomalous dimensions. We show that the results for the quark and gluon rapidity anomalous dimensions at four loops are related by generalized Casimir scaling. By utilizing the N4LO rapidity anomalous dimension, we achieve the resummation of the energy-energy correlation in the back-to-back limit at N4LL for the first time, resulting in a reduction of perturbative uncertainties on the resummed cross section to below 1%.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
S. Burger, S. Collins, M. Gockeler, M. Gruber, S. Piemonte, A. Schafer, A. Sternbeck, P. Wein
Summary: The study presents nonperturbative computation of renormalization factors in the RI'-(S)MOM schemes for QCD gauge field ensembles generated by CLS effort with three flavors of nonperturbatively improved Wilson quarks. Various boundary conditions and operators were considered in the study. Results for the RI'-SMOM scheme were obtained using three-loop conversion factors to the (MS) over bar scheme.
Article
Astronomy & Astrophysics
George Panagopoulos, Haralambos Panagopoulos, Gregoris Spanoudes
Summary: In this paper, one- and two-loop results for the renormalization of gluon and quark gauge-invariant operators in the QCD energy-momentum tensor are presented using dimensional regularization. The study identifies mixing among twist-2 symmetric traceless and flavor singlet operators and calculates mixing coefficients for nondiagonal components. Results for regularization-independent schemes addressing this mixing are discussed, with application to nonperturbative studies via lattice simulations. Conversion factors between proposed RI' schemes and the MS-bar schemes are extracted, providing an accessible way to relate various RI'-like schemes to MS-bar schemes.
Article
Physics, Nuclear
Charles Hughes, Antonio Carlos Oliveira da Silva, Christine Nattrass
Summary: Jets produced in high energy heavy ion collisions are suppressed by the quark gluon plasma. The comparison between models and data is sensitive to the method used to remove background fluctuations.
Article
Astronomy & Astrophysics
S. S. Aleshin, K. V. Stepanyantz
Summary: In this paper, we analyze the quantum properties of N = 2 and N = 4 supersymmetric gauge theories formulated in terms of N = 1 superfields and investigate the conditions required for the validity of nonrenormalization theorems. We calculate the two-loop contributions to the anomalous dimensions and the three-loop contributions to the fi-functions for an arbitrary N = 1 supersymmetric subtraction scheme. We show that the results generally do not vanish due to scheme dependence, but the twoloop anomalous dimensions vanish if the subtraction scheme is compatible with the structure of quantum corrections and does not break the relation between the Yukawa and gauge couplings.
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, Nuclear
H. M. Chen, L. M. Liu, J. T. Wang, M. Waqas, G. X. Peng
Summary: In this paper, the authors study the discontinuity of conventional quark mass at thresholds and propose a new expression for continuous quark masses. The new expression is expanded in terms of logarithmic energy with coefficients related to gamma and beta functions, up to the four-loop level. By eliminating their direct dependence on the coupling constant with large uncertainties, the new expressions for quark masses converge faster and with higher accuracy.
INTERNATIONAL JOURNAL OF MODERN PHYSICS E
(2022)
Article
Physics, Particles & Fields
Long Chen
Summary: The article discusses a prescription for computing polarized dimensionally regularized amplitudes by providing a recipe for constructing simple and general polarized amplitude projectors in D dimensions. This prescription offers technical advantages and can be used in a hybrid way with the conventional dimensional regularization scheme.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Zamiul Alam, Stephen P. Martin
Summary: This paper provides a set of simple interpolation formulas to quantitatively define the Standard Model in a mass-independent renormalization scheme. These formulas use on-shell experimental quantities as inputs and rely on the best available calculations in the pure MS scheme. They also account for parametric uncertainties for the short-distance Standard Model Lagrangian.
Proceedings Paper
Physics, Multidisciplinary
F. Moretti, M. Gorbahn, S. Jager, E. van der Merwe
Summary: The precision test of CKM unitarity in the Standard Model requires addressing electromagnetic corrections in semi-leptonic decays. We calculate the perturbative scheme conversion between the (MS) over bar scheme and various momentum-space subtraction schemes for a renormalized semi-leptonic four-fermion operator. We consider MOM and SMOM kinematics, highlighting the significance of the projector choice for each scheme. By making judicious choices of projector, we effectively reduce the scale dependence of the resulting Wilson coefficients and operator matrix elements.
INTERNATIONAL CONFERENCE ON KAON PHYSICS, KAON 2022
(2023)
Article
Physics, Particles & Fields
Ansgar Denner, Laura Jenniches, Jean-Nicolas Lang, Christian Sturm
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Physics, Particles & Fields
A. Denner, S. Dittmaier, A. Mueck, G. Passarino, M. Spira, C. Sturm, S. Uccirati, M. M. Weber
EUROPEAN PHYSICAL JOURNAL C
(2012)
Article
Physics, Particles & Fields
Christian Sturm
EUROPEAN PHYSICAL JOURNAL C
(2014)
Article
Physics, Particles & Fields
P. A. Baikov, K. G. Chetyrkin, J. H. Kuehn, C. Sturm
Article
Physics, Particles & Fields
Christian Sturm
Article
Astronomy & Astrophysics
William B. Kilgore, Christian Sturm
Article
Astronomy & Astrophysics
T. Blum, P. A. Boyle, N. H. Christ, N. Garron, E. Goode, T. Izubuchi, C. Jung, C. Kelly, C. Lehner, M. Lightman, Q. Liu, A. T. Lytle, R. D. Mawhinney, C. T. Sachrajda, A. Soni, C. Sturm
Article
Physics, Multidisciplinary
T. Blum, P. A. Boyle, N. H. Christ, N. Garron, E. Goode, T. Izubuchi, C. Jung, C. Kelly, C. Lehner, M. Lightman, Q. Liu, A. T. Lytle, R. D. Mawhinney, C. T. Sachrajda, A. Soni, C. Sturm
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Particles & Fields
Laura Jenniches, Christian Sturm, Sandro Uccirati
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Multidisciplinary
Stefano Foffa, Pierpaolo Mastrolia, Riccardo Sturani, Christian Sturm, William J. Tones Bobadilla
PHYSICAL REVIEW LETTERS
(2019)
Article
Astronomy & Astrophysics
A. T. Lytle, C. T. H. Davies, D. Hatton, G. P. Lepage, C. Sturm
Correction
Astronomy & Astrophysics
Konstantin G. Chetyrkin, Johann H. Kuehn, Andreas Maier, Philipp Maierhoefer, Peter Marquard, Matthias Steinhauser, Christian Sturm
Article
Astronomy & Astrophysics
Stefano Foffa, Pierpaolo Mastrolia, Riccardo Sturani, Christian Sturm
Proceedings Paper
Physics, Particles & Fields
Konstantin G. Chetyrkin, Johann H. Kuehn, Matthias Steinhauser, Christian Sturm
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2015)
Proceedings Paper
Physics, Particles & Fields
Christian Sturm
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2015)