Zobrazeno 1 - 10
of 890
pro vyhledávání: '"Alexandrou C"'
We determine the nucleon axial, scalar and tensor charges and the nucleon $\sigma$-terms using twisted mass fermions. We employ three ensembles with approximately equal physical volume of about 5.5~fm, three values of the lattice spacing, approximate
Externí odkaz:
http://arxiv.org/abs/2412.01535
Autor:
Alexandrou, C., Bacchio, S., De Santis, A., Evangelista, A., Finkenrath, J., Frezzotti, R., Gagliardi, G., Garofalo, M., Kalntis, N., Kostrzewa, B., Lubicz, V., Pittler, F., Romiti, S., Sanfilippo, F., Simula, S., Tantalo, N., Urbach, C., Wenger, U.
We present a lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution of the strange and charm quarks to the anomalous magnetic moment of the muon in isospin symmetric QCD. We employ the gauge configurations generated by the Extende
Externí odkaz:
http://arxiv.org/abs/2411.08852
Autor:
Alexandrou, C., Bacchio, S., De Santis, A., Evangelista, A., Finkenrath, J., Frezzotti, R., Gagliardi, G., Garofalo, M., Kostrzewa, B., Lubicz, V., Romiti, S., Sanfilippo, F., Simula, S., Tantalo, N., Urbach, C., Wenger, U.
We present a lattice determination of the inclusive decay rate of the process $\tau\mapsto X_{us} \nu_\tau$ in which the $\tau$ lepton decays into a generic hadronic state $X_{us}$ with $\bar u s$ flavour quantum numbers. Our results have been obtain
Externí odkaz:
http://arxiv.org/abs/2403.05404
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
Autor:
Spanoudes, G., Alexandrou, C., Finkenrath, J., Hadjiyiannakou, K., Panagopoulos, H., Yamamoto, S.
We present preliminary results for the renormalization functions (RFs) of a number of quark and gluon operators studied in lattice QCD using a gauge-invariant renormalization scheme (GIRS). GIRS is a variant of the coordinate-space renormalization pr
Externí odkaz:
http://arxiv.org/abs/2212.07730
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