Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Risch, Andreas"'
Autor:
Risch, Andreas
When designing lattice actions, gauge field smearing is often used in the definition of the lattice Dirac operator. Too much smearing can result in uncontrolled continuum extrapolations as the short distance behaviour of the theory is mutilated, whic
Externí odkaz:
http://arxiv.org/abs/2410.02794
Autor:
Kuberski, Simon, Cè, Marco, von Hippel, Georg, Meyer, Harvey B., Ottnad, Konstantin, Risch, Andreas, Wittig, Hartmut
We present results for the short-distance window observable of the hadronic vacuum polarization contribution to the muon $g-2$, computed via the time-momentum representation (TMR) in lattice QCD. A key novelty of our calculation is the reduction of d
Externí odkaz:
http://arxiv.org/abs/2401.11895
We give an update on an ongoing project in which we calculate the masses of octet and decuplet baryons including isospin-breaking effects. To this end, we employ single- and two-state-fits to effective masses up to leading order in the expansion in i
Externí odkaz:
http://arxiv.org/abs/2312.09065
Autor:
Risch, Andreas
Two popular methods to reduce discretisation effects are Symanzik improvement and gauge field smearing in the Dirac operator. Tree-level $O(a^2)$-improved Wilson fermions can be obtained from $O(a)$-improved Wilson fermions by adding one dimension-6
Externí odkaz:
http://arxiv.org/abs/2310.06587
We present the status of an ongoing project aimed at the inclusion of isospin-breaking corrections arising from the non-degeneracy of the light quark masses and electromagnetic interactions in calculations of the low-lying octet and decuplet baryon m
Externí odkaz:
http://arxiv.org/abs/2212.07176
When designing lattice actions, gauge field smearing is frequently used to define the lattice Dirac operator. Since the smearing procedure removes effects of ultraviolet fluctuations, the fermions effectively see a larger lattice spacing than the gau
Externí odkaz:
http://arxiv.org/abs/2212.04000
Autor:
José, Teseo San, Wittig, Hartmut, Cè, Marco, Gérardin, Antoine, von Hippel, Georg, Meyer, Harvey B., Miura, Kohtaroh, Ottnad, Konstantin, Risch, Andreas, Wilhelm, Jonas
Publikováno v:
PoS(LATTICE2022)328
We present results for the hadronic running of the electromagnetic coupling and the weak mixing angle from simulations of lattice QCD with $N_f=2+1$ flavours of $O(a)$-improved Wilson fermions. Using two different discretisations of the vector curren
Externí odkaz:
http://arxiv.org/abs/2212.02366
Autor:
Cè, Marco, Gérardin, Antoine, von Hippel, Georg, Hudspith, Renwick J., Kuberski, Simon, Meyer, Harvey B., Miura, Kohtaroh, Mohler, Daniel, Ottnad, Konstantin, Paul, Srijit, Risch, Andreas, José, Teseo San, Wittig, Hartmut
Following the publication of the new measurement of the anomalous magnetic moment of the muon, the discrepancy between experiment and the theory prediction from the $g-2$ theory initiative has increased to $4.2\,\sigma$. Recent lattice QCD calculatio
Externí odkaz:
http://arxiv.org/abs/2211.17083
Autor:
Cè, Marco, Gérardin, Antoine, von Hippel, Georg, Meyer, Harvey B., Miura, Kohtaroh, Ottnad, Konstantin, Risch, Andreas, José, Teseo San, Wittig, Hartmut
Publikováno v:
PoS(ICHEP2022)823
The energy dependency (running) of the strength of electromagnetic interactions $\alpha$ plays an important role in precision tests of the Standard Model. The running of the former to the $Z$ pole is an input quantity for global electroweak fits, whi
Externí odkaz:
http://arxiv.org/abs/2211.11401
Autor:
Cè, Marco, Gérardin, Antoine, von Hippel, Georg, Hudspith, Renwick J., Kuberski, Simon, Meyer, Harvey B., Miura, Kohtaroh, Mohler, Daniel, Ottnad, Konstantin, Paul, Srijit, Risch, Andreas, José, Teseo San, Wittig, Hartmut
Publikováno v:
Phys. Rev. D 106, 114502 (2022)
Euclidean time windows in the integral representation of the hadronic vacuum polarization contribution to the muon $g-2$ serve to test the consistency of lattice calculations and may help in tracing the origins of a potential tension between lattice
Externí odkaz:
http://arxiv.org/abs/2206.06582