Zobrazeno 1 - 10
of 1 828
pro vyhledávání: '"Jansen, K. A."'
Autor:
Alexandrou, C., Bacchio, S., Bergner, G., Burri, S., Finkenrath, J., Gasbarro, A., Hadjiyiannakou, K., Jansen, K., Kanwar, G., Kostrzewa, B., Koutsou, G., Ottnad, K., Petschlies, M., Pittler, F., Steffens, F., Urbach, C., Wenger, U.
Publikováno v:
Phys.Rev.D 108 (2023) 9, 094514
The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor $\mathcal{F}_{\pi^0\gamma\gamma}(q_1^2,q_2^2)$. Here we present an ab-initio lattice
Externí odkaz:
http://arxiv.org/abs/2308.12458
Autor:
Alexandrou, C., Bacchio, S., Dimopoulos, P., Finkenrath, J., Frezzotti, R., Gagliardi, G., Garofalo, M., Hadjiyiannakou, K., Kostrzewa, B., Jansen, K., Lubicz, V., Petschlies, M., Sanfilippo, F., Simula, S., Urbach, C., Wenger, U.
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_{\mu}^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_{\mu}^{\rm SD}$ and
Externí odkaz:
http://arxiv.org/abs/2212.09340
The Hamiltonian limit of lattice gauge theories can be found by extrapolating the results of anisotropic lattice computations, i.e., computations using lattice actions with different temporal and spatial lattice spacings ($a_t\neq a_s$), to the limit
Externí odkaz:
http://arxiv.org/abs/2212.09627
Autor:
Alexandrou, C., Bacchio, S., Dimopoulos, P., Finkenrath, J., Frezzotti, R., Gagliardi, G., Garofalo, M., Hadjiyiannakou, K., Kostrzewa, B., Jansen, K., Lubicz, V., Petschlies, M., Sanfilippo, F., Simula, S., Urbach, C., Wenger, U.
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_{\mu}^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_{\mu}^{\rm SD}$ and
Externí odkaz:
http://arxiv.org/abs/2206.15084
Autor:
Alexandrou, C., Bacchio, S., Constantinou, M., Dimopoulos, P., Finkenrath, J., Frezzotti, R., Hadjiyiannakou, K., Jansen, K., Kostrzewa, B., Koutsou, G., Spanoudes, G., Urbach, C.
We present a calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD. The densities are extracted from the unpolarized and transversity generalized form factors extrapolated to the continuum limit usi
Externí odkaz:
http://arxiv.org/abs/2202.09871
Autor:
Alexandrou, C., Bacchio, S., Bergner, G., Constantinou, M., Di Carlo, M., Dimopoulos, P., Finkenrath, J., Fiorenza, E., Frezzotti, R., Garofalo, M., Hadjiyiannakou, K., Kostrzewa, B., Koutsou, G., Jansen, K., Lubicz, V., Mangin-Brinet, M., Manigrasso, F., Martinelli, G., Pittler, F., Rossi, G. C., Sanfilippo, F., Simula, S., Tarantino, C., Todaro, A., Urbach, C., Wenger, U.
We present results for the light, strange and charm quark masses using $N_f=2+1+1$ twisted mass fermion ensembles at three values of the lattice spacing, including two ensembles simulated with the physical value of the pion mass. The analysis is done
Externí odkaz:
http://arxiv.org/abs/2110.04588
Publikováno v:
Phys. Rev. D 104, 074503 (2021)
We present results on the isoscalar form factors including the disconnected contributions, as well as on the strange and charm quark form factors. Using previous results on the isovector form factors, we determine the flavor decomposition of the nucl
Externí odkaz:
http://arxiv.org/abs/2106.13468
Autor:
Alexandrou, C., Bacchio, S., Bergner, G., Constantinou, M., Di Carlo, M., Dimopoulos, P., Finkenrath, J., Fiorenza, E., Frezzotti, R., Garofalo, M., Hadjiyiannakou, K., Kostrzewa, B., Koutsou, G., Jansen, K., Lubicz, V., Mangin-Brinet, M., Manigrasso, F., Martinelli, G., Papadiofantous, E., Pittler, F., Rossi, G. C., Sanfilippo, F., Simula, S., Tarantino, C., Todaro, A., Urbach, C., Wenger, U.
We present a calculation of the up, down, strange and charm quark masses performed within the lattice QCD framework. We use the twisted mass fermion action and carry out simulations that include in the sea two light mass-degenerate quarks, as well as
Externí odkaz:
http://arxiv.org/abs/2104.13408
Autor:
Alexandrou, C., Bacchio, S., Constantinou, M., Dimopoulos, P., Finkenrath, J., Hadjiyiannakou, K., Jansen, K., Koutsou, G., Kostrzewa, B., Leontiou, T., Urbach, C.
Publikováno v:
Phys. Rev. D 103, 034509 (2021)
We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the stra
Externí odkaz:
http://arxiv.org/abs/2011.13342
Publikováno v:
Phys. Rev. Lett. 126, 102003 (2021)
We present, for the first time, an \textit{ab initio} calculation of the individual up, down and strange quark helicity parton distribution functions for the proton. The calculation is performed within the twisted mass clover-improved fermion formula
Externí odkaz:
http://arxiv.org/abs/2009.13061