DC pole | Wartość | Język |
dc.contributor.author | Dubovyk, Ievgen | - |
dc.contributor.author | Freitas, Ayres | - |
dc.contributor.author | Gluza, Janusz | - |
dc.contributor.author | Riemann, Tord | - |
dc.contributor.author | Usovitsch, Johann | - |
dc.date.accessioned | 2020-05-20T08:49:35Z | - |
dc.date.available | 2020-05-20T08:49:35Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | "PoS - Proceedings of Science" No. 075 (2016), s. 1-26 | pl_PL |
dc.identifier.issn | 1824-8039 | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12128/14123 | - |
dc.description.abstract | The one-loop corrections to the weak mixing angle sin2 qb
eff, derived from the Z¯bb vertex, are
known since 1985. It took another 30 years to calculate the complete electroweak two-loop corrections
to sin2 qb
eff. The main obstacle was the calculation of the O(700) bosonic two-loop vertex
integrals with up to three mass scales, at s = M2
Z. We did not perform the usual integral reduction
and master evaluation, but chose a completely numerical approach, using two different calculational
chains. One method relies on publicly available sector decomposition implementations.
Further, we derived Mellin-Barnes (MB) representations, exploring the publicly available MB
suite. We had to supplement the MB suite by two new packages: AMBRE 3, a Mathematica program,
for the efficient treatment of non-planar integrals and MBnumerics for advanced numerics
in the Minkowskian space-time. Our preliminary result for LL2016, the “dessert”, for the electroweak
bosonic two-loop contributions to sin2 qb
eff is:
Dsin2 qb(a2;bos)
eff = sin2 qW Dk(a2;bos)
b , with Dk(a2;bos)
b = 1:0276 104.
This contribution is about a quarter of the corresponding fermionic corrections and of about the
same magnitude as several of the known higher-order QCD corrections. The sin2 qb
eff is now
predicited in the Standard Model with a relative error of 10-4 [1]. | pl_PL |
dc.language.iso | en | pl_PL |
dc.rights | Uznanie autorstwa-Użycie niekomercyjne-Bez utworów zależnych 3.0 Polska | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/pl/ | * |
dc.subject | electroweak | pl_PL |
dc.subject | loops | pl_PL |
dc.title | 30 years, some 700 integrals, and 1 dessert or: electroweak two-loop corrections to the Z ̄bb vertex | pl_PL |
dc.type | info:eu-repo/semantics/article | pl_PL |
dc.identifier.doi | 10.22323/1.260.0075 | - |
Pojawia się w kolekcji: | Artykuły (WNŚiT)
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