Results 11 to 20 of about 107,544 (258)

Tensor reduction of loop integrals

Journal of High Energy Physics, 2023
The computational cost associated with reducing tensor integrals to scalar integrals using the Passarino-Veltman method is dominated by the diagonalisation of large systems of equations.
Charalampos Anastasiou, Julia Karlen, Matilde Vicini   +2 more
doaj   +1 more source

Transverse momentum resummation at N3LL+NNLO for diboson processes

Journal of High Energy Physics, 2023
Diboson processes are one of the most accessible and stringent probes of the electroweak gauge structure of the Standard Model at the LHC. They will be probed at the percent level at the high-luminosity LHC, challenging current theory predictions.
John M. Campbell, R. Keith Ellis, Tobias Neumann, Satyajit Seth   +3 more
doaj   +1 more source

One-loop self-energy correction to the 1s and 2s hyperfine splitting in H-like systems [PDF]

, 2001
The one-loop self-energy correction to the hyperfine splitting of the 1s and 2s levels in H-like low-Z atoms is evaluated to all orders in Z\alpha. The results are compared to perturbative calculations. The residual higher-order contribution is evaluated.
A. Layzer, D. Zwanziger, H. A. Schluessler, H. Hellwig, H. Persson, H. Persson, J. Sapirstein, J. Schwinger, K. Pachucki, L. Essen, M. B. Shabaeva, M. H. Prior, M. Nio, N. Kroll, N. Kroll, P. Sunnergren, R. Karplus, R. Karplus, S. A. Blundell, S. A. Blundell, S. G. Karshenboim, S. Mallampalli, U. D. Jentschura, U. D. Jentschura, V. A. Yerokhin, V. A. Yerokhin, V. A. Yerokhin, V. M. Shabaev, V. M. Shabaev, V. M. Shabaev, V. M. Shabaev, V. M. Shabaev   +31 more
core   +2 more sources

An extensive survey of the estimation of uncertainties from missing higher orders in perturbative calculations [PDF]

, 2014
We consider two approaches to estimate and characterise the theoretical uncertainties stemming from the missing higher orders in perturbative calculations in Quantum Chromodynamics: the traditional one based on renormalisation and factorisation scale ...
Bagnaschi, Emanuele, Cacciari, Matteo, Guffanti, Alberto, Jenniches, Laura   +3 more
core   +2 more sources

One-loop matrix element emulation with factorisation awareness

Journal of High Energy Physics, 2023
In this article we present an emulation strategy for one-loop matrix elements. This strategy is based on the factorisation properties of matrix elements and is an extension of the work presented in [1].
D. Maître, H. Truong
doaj   +1 more source

Connecting Different TMD Factorization Formalisms in QCD [PDF]

, 2017
In the original Collins-Soper-Sterman (CSS) presentation of the results of transverse-momentum-dependent (TMD) factorization for the Drell-Yan process, results for perturbative coefficients can be obtained from calculations for collinear factorization ...
Collins, John, Rogers, Ted C.
core   +3 more sources

Building blocks of Cwebs in multiparton scattering amplitudes

Journal of High Energy Physics, 2022
The correlators of Wilson-line operators in non-abelian gauge theories are known to exponentiate, and their logarithms can be organised in terms of the collections of Feynman diagrams called Cwebs.
Neelima Agarwal, Sourav Pal, Aditya Srivastav, Anurag Tripathi   +3 more
doaj   +1 more source

Double-real-virtual and double-virtual-real corrections to the three-loop thrust soft function

Journal of High Energy Physics, 2022
We compute the O $$ \mathcal{O} $$ ( α s 3 $$ {\alpha}_s^3 $$ ) double-real-virtual (RRV) and double-virtual-real (VVR) soft contributions to the thrust/zero-jettiness event shape.
Wen Chen, Feng Feng, Yu Jia, Xiaohui Liu
doaj   +1 more source

N3LO+N3LL QCD improved Higgs pair cross sections

Journal of High Energy Physics, 2023
We report a new calculation of the soft-gluon threshold resummation for the Higgs boson pair production in the dominant production mode — gluon-gluon fusion — up to the next-to-next-to-next-to-leading logarithmic (N3LL) accuracy.
A. H. Ajjath, Hua-Sheng Shao
doaj   +1 more source

Topological Strings and Quantum Spectral Problems [PDF]

, 2014
We consider certain quantum spectral problems appearing in the study of local Calabi-Yau geometries. The quantum spectrum can be computed by the Bohr-Sommerfeld quantization condition for a period integral.
Huang, Min-xin, Wang, Xian-fu
core   +2 more sources