Zobrazeno 1 - 10 of 44 pro vyhledávání: '"K. G. Chetyrkin"'
1
Akademický článek
Operator product expansion of the non-local gluon condensate
Autor: V. M. Braun, K. G. Chetyrkin, B. A. Kniehl
Publikováno v: Journal of High Energy Physics, Vol 2021, Iss 5, Pp 1-13 (2021)
Abstract We consider the short-distance expansion of the product of two gluon field strength tensors connected by a straight-line-ordered Wilson line. The vacuum expectation value of this nonlocal operator is a common object in studies of the QCD vac
Externí odkaz: https://doaj.org/article/4ef1399c938c44658e55c282e8226185
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2
Akademický článek
Renormalization of parton quasi-distributions beyond the leading order: spacelike vs. timelike
Autor: V. M. Braun, K. G. Chetyrkin, B. A. Kniehl
Publikováno v: Journal of High Energy Physics, Vol 2020, Iss 7, Pp 1-24 (2020)
Abstract We argue that the renormalization factors for non-local quark-antiquark and gluon operators at space-like and time-like separations connected by a Wilson line coincide to all orders in perturbation theory. We calculate the anomalous dimensio
Externí odkaz: https://doaj.org/article/3ac4aea80b1849db90b9a7cb36fd2ea4
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3
Akademický článek
The structure of generic anomalous dimensions and no-π theorem for massless propagators
Autor: P. A. Baikov, K. G. Chetyrkin
Publikováno v: Journal of High Energy Physics, Vol 2018, Iss 6, Pp 1-25 (2018)
Abstract Extending an argument of [1] for the case of 5-loop massless propagators we prove a host of new exact model-independent relations between contributions proportional to odd and even zetas in generic MS¯ $$ \overline{\mathrm{MS}} $$ anomalous
Externí odkaz: https://doaj.org/article/a7ce89aa24154d259cdeec1c7421f85f
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4
Akademický článek
Five-loop renormalisation of QCD in covariant gauges
Autor: K. G. Chetyrkin, G. Falcioni, F. Herzog, J.A.M. Vermaseren
Publikováno v: Journal of High Energy Physics, Vol 2017, Iss 10, Pp 1-18 (2017)
Abstract We present the complete set of vertex, wave function and charge renormalisation constants in QCD in a general simple gauge group and with the complete dependence on the covariant gauge parameter ξ in the minimal subtraction scheme of conven
Externí odkaz: https://doaj.org/article/8ca228e812c1463ab733ba4140c18aa8
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5
Akademický článek
Four-loop renormalization of QCD with a reducible fermion representation of the gauge group: anomalous dimensions and renormalization constants
Autor: K. G. Chetyrkin, M. F. Zoller
Publikováno v: Journal of High Energy Physics, Vol 2017, Iss 6, Pp 1-15 (2017)
Abstract We present analytical results at four-loop level for the renormalization constants and anomalous dimensions of an extended QCD model with one coupling constant and an arbitrary number of fermion representations. One example of such a model i
Externí odkaz: https://doaj.org/article/d87b7853964d457e96be0751b413350d
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6
Higgs-boson, tau-lepton, and Z-boson decay ratesin fourth order and the five-loop $β$ function of QCD
Autor: K. G. Chetyrkin, P.A. Baikov, Johann H. Kuhn
Publikováno v: Proceedings of alphas-2019: Workshop on precision measurements of the QCD coupling constant — PoS(ALPHAS2019).
The Higgs-boson decay rates into $bb$ and into $gg$ have been evaluated in N4LO, corresponding to order $α4s$ for $bb$ and order $α6s$ for $gg$ final states. After inclusion of the four-loop term, nice stabilization of the series is observed. In a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c77b50765edd58a9f791297324ba95c9
https://doi.org/10.22323/1.365.0007
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7
Addendum to 'Charm and bottom quark masses: An update'
Autor: Matthias Steinhauser, P. Maierhöfer, Johann H. Kuhn, Christian Sturm, Andreas Maier, K. G. Chetyrkin, Peter Marquard
Publikováno v: Physical review / D 96(11), 116007 (2017). doi:10.1103/PhysRevD.96.116007
We update the experimental moments for the charm quark as computed in [J. H. Kühn, M. Steinhauser, and C. Sturm, Nucl. Phys. B778, 192 (2007)NUPBBO0550-321310.1016/j.nuclphysb.2007.04.036] and used in [K. G. Chetyrkin, J. H. Kühn, A. Maier, P. Maie
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7711b3ec156706a6b6f21eedcb0a9e66
https://doi.org/10.1103/physrevd.96.116007
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8
Five-loop renormalisation of QCD in covariant gauges
Autor: Giulio Falcioni, Franz Herzog, K. G. Chetyrkin, Jos Vermaseren
Publikováno v: Journal of High Energy Physics, Vol 2017, Iss 10, Pp 1-18 (2017)
Journal of High Energy Physics
Chetyrkin, K G, Falcioni, G, Herzog, F & Vermaseren, J A M 2017, ' Five-loop renormalisation of QCD in covariant gauges ', Journal of High Energy Physics . https://doi.org/10.1007/JHEP10(2017)179
We present the complete set of vertex, wave function and charge renormalisation constants in QCD in a general simple gauge group and with the complete dependence on the covariant gauge parameter $\xi$ in the minimal subtraction scheme of conventional
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f40883ae06a58d672cada91d7b8d36d
http://arxiv.org/abs/1709.08541
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10
Multiloop Calculations: towards R at Order
Autor: P.A. Baikov, K. G. Chetyrkin, J. H. Kühn
Publikováno v: Nuclear Physics B - Proceedings Supplements. 157:27-31
We discuss recent developments in multiloop calculations aiming eventually in computing the total cross section for e^+e^- annihilation into hadrons in order alpha_s^4.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bbd20ce4a27de4ba60c79187e6da1506
https://doi.org/10.1016/j.nuclphysbps.2006.03.005
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