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The outcome of the SAMPLE Experiment suggests that the strange-quark contribution to the nucleon magnetic moment, G_M^s(0), may be greater than zero. This result is very difficult to reconcile with expectations based on the successful…

High Energy Physics - Lattice · Physics 2010-02-17 Derek B. Leinweber , Anthony W. Thomas

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low mass lattice QCD simulations of the individual quark contributions to the magnetic moments of the nucleon octet, we obtain a precise…

High Energy Physics - Lattice · Physics 2008-11-26 D. B. Leinweber , S. Boinepalli , I. C. Cloet , A. W. Thomas , A. G. Williams , R. D. Young , J. M. Zanotti , J. B. Zhang

New data from parity-violating experiments on the deuteron now allow isolation of the strange-quark contribution to the nucleon magnetic moment, G_M^s(0), without the uncertainty surrounding the anapole moment of the nucleon. Still, best…

Nuclear Theory · Physics 2010-02-17 D. B. Leinweber , A. W. Thomas

We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the…

High Energy Physics - Phenomenology · Physics 2017-01-30 Raza Sabbir Sufian , Yi-Bo Yang , Andrei Alexandru , Terrence Draper , Keh-Fei Liu , Jian Liang

Effective quark magnetic moments are extracted from experimental measurements as a function of the strangeness magnetic moment of the nucleon. Assumptions made in even the most general quark model analyses are ruled out by this…

Nuclear Theory · Physics 2009-10-28 Derek B. Leinweber

We calculate the strange magnetic moment of the nucleon on a quenched $16^3 \times 24$ lattice at $\beta = 6.0$, and with Wilson fermions at $\kappa$ = 0.148, 0.152, and 0.154. The strange quark contribution from the disconnected insertion…

High Energy Physics - Lattice · Physics 2009-10-31 Nilmani Mathur , Shao-Jing Dong

The strange magnetic moment of the nucleon ($\mu_s$) is examined as part of the nucleon's isoscalar anomalous moment. The dominant up and down quark effects in the anomalous moment may actually tend to favor $\mu_s >0$, which is contrary to…

High Energy Physics - Phenomenology · Physics 2008-02-03 R. D. McKeown

We report on a lattice QCD calculation of the strangeness magnetic moment of the nucleon. Our result is $G_M^s(0) = - 0.36 \pm 0.20 $. The sea contributions from the u and d quarks are about 80% larger. However, they cancel to a large…

High Energy Physics - Phenomenology · Physics 2010-03-04 S. J. Dong , K. F. Liu , A. G. Williams

By imposing the constraints of charge symmetry we show that the strangeness magnetic moment of the nucleon can be expressed in terms of empirical magnetic moments and ratios of valence quark magnetic moments. The latter are determined using…

High Energy Physics - Lattice · Physics 2009-11-10 D. B. Leinweber , S. Boinepalli , A. W. Thomas , A. G. Williams , R. D. Young , J. M. Zanotti , J. B. Zhang

We report on recent lattice QCD calculations of the strangeness magnetic moment of the nucleon and the nucleon electromagnetic form factors, when we allow the electromagnetic current to connect to quark loops as well as to the valence…

High Energy Physics - Lattice · Physics 2008-11-26 Anthony G. Williams

We report a new determination of the strange quark contribution to the proton's magnetic form factor at a four-momentum transfer Q2 = 0.1 (GeV/c)^2 from parity-violating e-p elastic scattering. The result uses a revised analysis of data…

Nuclear Experiment · Physics 2009-07-09 SAMPLE collaboration , D. T. Spayde

The strange contribution to the electric and magnetic form factors of the nucleon is determined at a range of discrete values of $Q^2$ up to $1.4$ GeV$^2$. This is done by combining recent lattice QCD results for the electromagnetic form…

High Energy Physics - Lattice · Physics 2015-03-05 P. E. Shanahan , R. Horsley , Y. Nakamura , D. Pleiter , P. E. L. Rakow , G. Schierholz , H. Stüben , A. W. Thomas , R. D. Young , J. M. Zanotti

Systematic uncertainties in the recent precise determination of the strangeness magnetic moment of the nucleon are identified and quantified. In summary, G_M^s = -0.046 \pm 0.019 \mu_N.

High Energy Physics - Lattice · Physics 2009-11-11 D. B. Leinweber , S. Boinepalli , A. W. Thomas , A. G. Williams , R. D. Young , J. B. Zhang , J. M. Zanotti

The strange form factors of the nucleon are studied in a two-component model consisting of a three-quark intrinsic structure surrounded by a meson cloud. A comparison with the available experimental world data from the SAMPLE, PVA4, HAPPEX…

Nuclear Theory · Physics 2014-11-18 R. Bijker

The strangeness contribution to the electric and magnetic properties of the nucleon has been under investigation experimentally for many years. Lattice Quantum Chromodynamics (LQCD) gives theoretical predictions of these measurements by…

High Energy Physics - Lattice · Physics 2008-01-24 Dean Darnell

The strangeness contribution to the nucleon magnetic moment is calculated at the one-loop level in a relativistic SU(3) chiral potential model and is found to be {\em positive}, that is, with an {\em opposite} sign to the nucleon…

High Energy Physics - Phenomenology · Physics 2007-05-23 X. B. Chen , X. S. Chen , Amand Faessler , Th. Gutsche , F. Wang

Using heavy baryon chiral perturbation theory to one loop, we derive an analytic and parameter-free expression for the momentum dependence of the strange magnetic form factor of the nucleon $G_M^{(s)} (Q^2)$ and its corresponding radius.…

High Energy Physics - Phenomenology · Physics 2009-10-31 T. R. Hemmert , Ulf-G. Meißner , S. Steininger

We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors $G_E^s$ and $G_M^s$ in the kinematic range $0 \leq Q^2 \lesssim 1.2\: {\rm GeV}^2$. For the first time, both $G_E^s$ and $G_M^s$ are shown to be…

We present the strange electromagnetic form factors of the nucleon using lattice QCD simulations with degenerate light, a strange, and a charm quark in the sea with masses tuned to their physical values. For the first time, the strange…

The strangeness magnetic moment of the proton is shown to be small in the chiral quark model. The dominant loop contribution is due to kaons. The K^* loop contributions are proportional to the difference between the strange and light…

High Energy Physics - Phenomenology · Physics 2011-08-11 L. Hannelius , D. O. Riska , L. Ya. Glozman
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