This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.22323/1.334.0119 in citations.
Please use the identifier: http://hdl.handle.net/2128/23947 in citations.
The strange quark contribution to the spin of the nucleon
The strange quark contribution to the spin of the nucleon
Quark line disconnected matrix elements of an operator, such as the axial current, are difficult to compute on the lattice. The standard method uses a stochastic estimator of the operator, which is generally very noisy. We discuss and develop further our alternative approach using the Feynman-Hellma...
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Personal Name(s): | Horsley, Roger (Corresponding author) |
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Nakamura, Yoshifumi / Perlt, Holger / Pleiter, D. / Rakow, P. E. L. / Schierholz, Gerrit / Schiller, Arwed / Stuben, Hinnerk / Young, Ross D. / Zanotti, J. M. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC |
Published in: |
Proceedings of The 36th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2018) - Sissa Medialab Trieste, Italy, 2019. - ISBN - doi:10.22323/1.334.0119 |
Imprint: |
Sissa Medialab Trieste, Italy
2019
|
Physical Description: |
119 |
DOI: |
10.22323/1.334.0119 |
Conference: | The 36th Annual International Symposium on Lattice Field Theory, Michigan State University (East Lansing), 2018-07-22 - 2018-07-28 |
Document Type: |
Contribution to a book Contribution to a conference proceedings |
Research Program: |
Supercomputer Facility |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/23947 in citations.
Quark line disconnected matrix elements of an operator, such as the axial current, are difficult to compute on the lattice. The standard method uses a stochastic estimator of the operator, which is generally very noisy. We discuss and develop further our alternative approach using the Feynman-Hellmann theorem which involves only evaluating two-point correlation functions. This is applied to computing the contribution of the quark spin to the nucleon and in particular for the strange quark. In this process we also pay particular attention to the development of an SU(3) flavour breaking expansion for singlet operators. |