Zobrazeno 1 - 10
of 568
pro vyhledávání: '"Goeckeler, M."'
Autor:
Bürger, S., Wurm, T., Löffler, M., Göckeler, M., Bali, G., Collins, S., Schäfer, A., Sternbeck, A.
Using lattice QCD, we calculate the twist-2 contribution $a_2$ to the third Mellin moment of the spin structure functions $g_1$ and $g_2$ in the nucleon. In addition we evaluate the twist-3 contribution $d_2$. Our computations make use of $N_f=2+1$ g
Externí odkaz:
http://arxiv.org/abs/2111.08306
Autor:
Bali, G. S., Bürger, S., Collins, S., Göckeler, M., Gruber, M., Piemonte, S., Schäfer, A., Sternbeck, A., Wein, P.
Publikováno v:
Phys. Rev. D 103, 094511 (2021)
We present the nonperturbative computation of renormalization factors in the RI'-(S)MOM schemes for the QCD gauge field ensembles generated by the CLS (coordinated lattice simulations) effort with three flavors of nonperturbatively improved Wilson (c
Externí odkaz:
http://arxiv.org/abs/2012.06284
Autor:
RQCD Collaboration, Bali, G. S., Braun, V. M., Göckeler, M., Gruber, M., Hutzler, F., Korcyl, P., Lang, B., Schäfer, A.
Using the second moment of the pion distribution amplitude as an example, we investigate whether lattice calculations of matrix elements of local operators involving covariant derivatives may benefit from the recently proposed momentum smearing techn
Externí odkaz:
http://arxiv.org/abs/1705.10236
Publikováno v:
PoS(LATTICE2016)187
We report on our studies of the renormalization of flavor singlet quark bilinear operators in lattice QCD. The renormalization constants are determined non-perturbatively using gauge field ensembles with Nf=2 dynamical clover improved fermions. The r
Externí odkaz:
http://arxiv.org/abs/1703.03745
Autor:
Braun, V. M., Collins, S., Göckeler, M., Pérez-Rubio, P., Schäfer, A., Schiel, R. W., Sternbeck, A.
We have calculated the second moment of the pion light-cone distribution amplitude using two flavors of dynamical (clover) fermions on lattices of different volumes, lattice spacings between $0.06 \, \mathrm {fm}$ and $0.08 \, \mathrm {fm}$ and pion
Externí odkaz:
http://arxiv.org/abs/1510.07429
Autor:
Braun, V. M., Collins, S., Göckeler, M., Pérez-Rubio, P., Schäfer, A., Schiel, R. W., Sternbeck, A.
Publikováno v:
Phys. Rev. D 92, 014504 (2015)
We present the results of a lattice study of the second moment of the light-cone pion distribution amplitude using two flavors of dynamical (clover) fermions on lattices of different volumes and pion masses down to $m_\pi\sim 150 \, \mathrm {MeV}$. A
Externí odkaz:
http://arxiv.org/abs/1503.03656
Autor:
Braun, V. M., Collins, S., Gläßle, B., Göckeler, M., Schäfer, A., Schiel, R. W., Söldner, W., Sternbeck, A., Wein, P.
Publikováno v:
Phys. Rev. D 89, 094511 (2014)
We present the results of a lattice study of light-cone distribution amplitudes (DAs) of the nucleon and negative parity nucleon resonances using two flavors of dynamical (clover) fermions on lattices of different volumes and pion masses down to m_pi
Externí odkaz:
http://arxiv.org/abs/1403.4189
Autor:
Bali, G. S., Collins, S., Gläßle, B., Göckeler, M., Najjar, J., Rödl, R., Schäfer, A., Schiel, R., Söldner, W., Sternbeck, A., Wein, P.
Publikováno v:
PoS(Lattice 2013)291
We present new N_f=2 data for the nucleon generalized form factors, varying volume, lattice spacing and pion mass, down to 150 MeV. We also give an update of our direct calculation of the nucleon sigma term for a range of pion mass values including t
Externí odkaz:
http://arxiv.org/abs/1312.0828
Autor:
Bali, G., Collins, S., Glässle, B., Göckeler, M., Javadi-Motaghi, N., Najjar, J., Söldner, W., Sternbeck, A.
Publikováno v:
PoS(LATTICE 2013)447
We report on the lowest moment of parton distribution functions and generalized form factors for the pion at several values of the momentum transfer. Calculations are performed for N_f=2 flavors of O(a) improved Wilson fermions with pion masses down
Externí odkaz:
http://arxiv.org/abs/1311.7639
Autor:
Bali, G. S., Collins, S., Gläßle, B., Göckeler, M., Najjar, J., Rödl, R., Schäfer, A., Schiel, R., Sternbeck, A., Söldner, W.
We report on our on-going study of the lower moments of iso-vector polarised and unpolarised structure functions, $g_A$ and $\langle x\rangle_{u-d}$, respectively, and the iso-vector scalar and tensor charge, for $N_f=2$ non-perturbatively improved c
Externí odkaz:
http://arxiv.org/abs/1311.7041